Adding web-tools (WIP).

Signed-off-by: Daniel Baumann <daniel.baumann@open-infrastructure.net>
author: Daniel Baumann <daniel.baumann@open-infrastructure.net> 2021-10-14 14:59:23 +0000
committer: Daniel Baumann <daniel.baumann@open-infrastructure.net> 2022-01-27 07:04:33 +0000
commit: e7de04494b70ca62ac1abda7f9a3ef41994f4f51 (patch)
tree: 78a8387bbe7d9204f2c46a3e5128a7e2e58ba322 /web-tools/web/_static/popperjs
parent: Adding debian packaging. (diff)
download: network-tools-e7de04494b70ca62ac1abda7f9a3ef41994f4f51.tar.xz
network-tools-e7de04494b70ca62ac1abda7f9a3ef41994f4f51.zip
15 files changed, 4259 insertions, 0 deletions
diff --git a/web-tools/web/_static/popperjs/popper-base.js b/web-tools/web/_static/popperjs/popper-base.js
new file mode 100644
index 0000000..18cd1d7
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-base.js
@@ -0,0 +1,1030 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = global || self, factory(global.Popper = {}));
+}(this, (function (exports) { 'use strict';
+
+  function getBoundingClientRect(element) {
+    var rect = element.getBoundingClientRect();
+    return {
+      width: rect.width,
+      height: rect.height,
+      top: rect.top,
+      right: rect.right,
+      bottom: rect.bottom,
+      left: rect.left,
+      x: rect.left,
+      y: rect.top
+    };
+  }
+
+  /*:: import type { Window } from '../types'; */
+
+  /*:: declare function getWindow(node: Node | Window): Window; */
+  function getWindow(node) {
+    if (node.toString() !== '[object Window]') {
+      var ownerDocument = node.ownerDocument;
+      return ownerDocument ? ownerDocument.defaultView || window : window;
+    }
+
+    return node;
+  }
+
+  function getWindowScroll(node) {
+    var win = getWindow(node);
+    var scrollLeft = win.pageXOffset;
+    var scrollTop = win.pageYOffset;
+    return {
+      scrollLeft: scrollLeft,
+      scrollTop: scrollTop
+    };
+  }
+
+  /*:: declare function isElement(node: mixed): boolean %checks(node instanceof
+    Element); */
+
+  function isElement(node) {
+    var OwnElement = getWindow(node).Element;
+    return node instanceof OwnElement || node instanceof Element;
+  }
+  /*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof
+    HTMLElement); */
+
+
+  function isHTMLElement(node) {
+    var OwnElement = getWindow(node).HTMLElement;
+    return node instanceof OwnElement || node instanceof HTMLElement;
+  }
+  /*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof
+    ShadowRoot); */
+
+
+  function isShadowRoot(node) {
+    var OwnElement = getWindow(node).ShadowRoot;
+    return node instanceof OwnElement || node instanceof ShadowRoot;
+  }
+
+  function getHTMLElementScroll(element) {
+    return {
+      scrollLeft: element.scrollLeft,
+      scrollTop: element.scrollTop
+    };
+  }
+
+  function getNodeScroll(node) {
+    if (node === getWindow(node) || !isHTMLElement(node)) {
+      return getWindowScroll(node);
+    } else {
+      return getHTMLElementScroll(node);
+    }
+  }
+
+  function getNodeName(element) {
+    return element ? (element.nodeName || '').toLowerCase() : null;
+  }
+
+  function getDocumentElement(element) {
+    // $FlowFixMe: assume body is always available
+    return ((isElement(element) ? element.ownerDocument : element.document) || window.document).documentElement;
+  }
+
+  function getWindowScrollBarX(element) {
+    // If <html> has a CSS width greater than the viewport, then this will be
+    // incorrect for RTL.
+    // Popper 1 is broken in this case and never had a bug report so let's assume
+    // it's not an issue. I don't think anyone ever specifies width on <html>
+    // anyway.
+    // Browsers where the left scrollbar doesn't cause an issue report `0` for
+    // this (e.g. Edge 2019, IE11, Safari)
+    return getBoundingClientRect(getDocumentElement(element)).left + getWindowScroll(element).scrollLeft;
+  }
+
+  function getComputedStyle(element) {
+    return getWindow(element).getComputedStyle(element);
+  }
+
+  function isScrollParent(element) {
+    // Firefox wants us to check `-x` and `-y` variations as well
+    var _getComputedStyle = getComputedStyle(element),
+        overflow = _getComputedStyle.overflow,
+        overflowX = _getComputedStyle.overflowX,
+        overflowY = _getComputedStyle.overflowY;
+
+    return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);
+  }
+
+  // Composite means it takes into account transforms as well as layout.
+
+  function getCompositeRect(elementOrVirtualElement, offsetParent, isFixed) {
+    if (isFixed === void 0) {
+      isFixed = false;
+    }
+
+    var documentElement = getDocumentElement(offsetParent);
+    var rect = getBoundingClientRect(elementOrVirtualElement);
+    var isOffsetParentAnElement = isHTMLElement(offsetParent);
+    var scroll = {
+      scrollLeft: 0,
+      scrollTop: 0
+    };
+    var offsets = {
+      x: 0,
+      y: 0
+    };
+
+    if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
+      if (getNodeName(offsetParent) !== 'body' || // https://github.com/popperjs/popper-core/issues/1078
+      isScrollParent(documentElement)) {
+        scroll = getNodeScroll(offsetParent);
+      }
+
+      if (isHTMLElement(offsetParent)) {
+        offsets = getBoundingClientRect(offsetParent);
+        offsets.x += offsetParent.clientLeft;
+        offsets.y += offsetParent.clientTop;
+      } else if (documentElement) {
+        offsets.x = getWindowScrollBarX(documentElement);
+      }
+    }
+
+    return {
+      x: rect.left + scroll.scrollLeft - offsets.x,
+      y: rect.top + scroll.scrollTop - offsets.y,
+      width: rect.width,
+      height: rect.height
+    };
+  }
+
+  // Returns the layout rect of an element relative to its offsetParent. Layout
+  // means it doesn't take into account transforms.
+  function getLayoutRect(element) {
+    return {
+      x: element.offsetLeft,
+      y: element.offsetTop,
+      width: element.offsetWidth,
+      height: element.offsetHeight
+    };
+  }
+
+  function getParentNode(element) {
+    if (getNodeName(element) === 'html') {
+      return element;
+    }
+
+    return (// $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle
+      element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
+      element.parentNode || // DOM Element detected
+      // $FlowFixMe: need a better way to handle this...
+      element.host || // ShadowRoot detected
+      // $FlowFixMe: HTMLElement is a Node
+      getDocumentElement(element) // fallback
+
+    );
+  }
+
+  function getScrollParent(node) {
+    if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {
+      // $FlowFixMe: assume body is always available
+      return node.ownerDocument.body;
+    }
+
+    if (isHTMLElement(node) && isScrollParent(node)) {
+      return node;
+    }
+
+    return getScrollParent(getParentNode(node));
+  }
+
+  /*
+  given a DOM element, return the list of all scroll parents, up the list of ancesors
+  until we get to the top window object. This list is what we attach scroll listeners
+  to, because if any of these parent elements scroll, we'll need to re-calculate the 
+  reference element's position.
+  */
+
+  function listScrollParents(element, list) {
+    if (list === void 0) {
+      list = [];
+    }
+
+    var scrollParent = getScrollParent(element);
+    var isBody = getNodeName(scrollParent) === 'body';
+    var win = getWindow(scrollParent);
+    var target = isBody ? [win].concat(win.visualViewport || [], isScrollParent(scrollParent) ? scrollParent : []) : scrollParent;
+    var updatedList = list.concat(target);
+    return isBody ? updatedList : // $FlowFixMe: isBody tells us target will be an HTMLElement here
+    updatedList.concat(listScrollParents(getParentNode(target)));
+  }
+
+  function isTableElement(element) {
+    return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;
+  }
+
+  function getTrueOffsetParent(element) {
+    if (!isHTMLElement(element) || // https://github.com/popperjs/popper-core/issues/837
+    getComputedStyle(element).position === 'fixed') {
+      return null;
+    }
+
+    var offsetParent = element.offsetParent;
+
+    if (offsetParent) {
+      var html = getDocumentElement(offsetParent);
+
+      if (getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static' && getComputedStyle(html).position !== 'static') {
+        return html;
+      }
+    }
+
+    return offsetParent;
+  } // `.offsetParent` reports `null` for fixed elements, while absolute elements
+  // return the containing block
+
+
+  function getContainingBlock(element) {
+    var currentNode = getParentNode(element);
+
+    while (isHTMLElement(currentNode) && ['html', 'body'].indexOf(getNodeName(currentNode)) < 0) {
+      var css = getComputedStyle(currentNode); // This is non-exhaustive but covers the most common CSS properties that
+      // create a containing block.
+
+      if (css.transform !== 'none' || css.perspective !== 'none' || css.willChange && css.willChange !== 'auto') {
+        return currentNode;
+      } else {
+        currentNode = currentNode.parentNode;
+      }
+    }
+
+    return null;
+  } // Gets the closest ancestor positioned element. Handles some edge cases,
+  // such as table ancestors and cross browser bugs.
+
+
+  function getOffsetParent(element) {
+    var window = getWindow(element);
+    var offsetParent = getTrueOffsetParent(element);
+
+    while (offsetParent && isTableElement(offsetParent) && getComputedStyle(offsetParent).position === 'static') {
+      offsetParent = getTrueOffsetParent(offsetParent);
+    }
+
+    if (offsetParent && getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static') {
+      return window;
+    }
+
+    return offsetParent || getContainingBlock(element) || window;
+  }
+
+  var top = 'top';
+  var bottom = 'bottom';
+  var right = 'right';
+  var left = 'left';
+  var auto = 'auto';
+  var basePlacements = [top, bottom, right, left];
+  var start = 'start';
+  var end = 'end';
+  var clippingParents = 'clippingParents';
+  var viewport = 'viewport';
+  var popper = 'popper';
+  var reference = 'reference';
+
+  var beforeRead = 'beforeRead';
+  var read = 'read';
+  var afterRead = 'afterRead'; // pure-logic modifiers
+
+  var beforeMain = 'beforeMain';
+  var main = 'main';
+  var afterMain = 'afterMain'; // modifier with the purpose to write to the DOM (or write into a framework state)
+
+  var beforeWrite = 'beforeWrite';
+  var write = 'write';
+  var afterWrite = 'afterWrite';
+  var modifierPhases = [beforeRead, read, afterRead, beforeMain, main, afterMain, beforeWrite, write, afterWrite];
+
+  function order(modifiers) {
+    var map = new Map();
+    var visited = new Set();
+    var result = [];
+    modifiers.forEach(function (modifier) {
+      map.set(modifier.name, modifier);
+    }); // On visiting object, check for its dependencies and visit them recursively
+
+    function sort(modifier) {
+      visited.add(modifier.name);
+      var requires = [].concat(modifier.requires || [], modifier.requiresIfExists || []);
+      requires.forEach(function (dep) {
+        if (!visited.has(dep)) {
+          var depModifier = map.get(dep);
+
+          if (depModifier) {
+            sort(depModifier);
+          }
+        }
+      });
+      result.push(modifier);
+    }
+
+    modifiers.forEach(function (modifier) {
+      if (!visited.has(modifier.name)) {
+        // check for visited object
+        sort(modifier);
+      }
+    });
+    return result;
+  }
+
+  function orderModifiers(modifiers) {
+    // order based on dependencies
+    var orderedModifiers = order(modifiers); // order based on phase
+
+    return modifierPhases.reduce(function (acc, phase) {
+      return acc.concat(orderedModifiers.filter(function (modifier) {
+        return modifier.phase === phase;
+      }));
+    }, []);
+  }
+
+  function debounce(fn) {
+    var pending;
+    return function () {
+      if (!pending) {
+        pending = new Promise(function (resolve) {
+          Promise.resolve().then(function () {
+            pending = undefined;
+            resolve(fn());
+          });
+        });
+      }
+
+      return pending;
+    };
+  }
+
+  function format(str) {
+    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      args[_key - 1] = arguments[_key];
+    }
+
+    return [].concat(args).reduce(function (p, c) {
+      return p.replace(/%s/, c);
+    }, str);
+  }
+
+  var INVALID_MODIFIER_ERROR = 'Popper: modifier "%s" provided an invalid %s property, expected %s but got %s';
+  var MISSING_DEPENDENCY_ERROR = 'Popper: modifier "%s" requires "%s", but "%s" modifier is not available';
+  var VALID_PROPERTIES = ['name', 'enabled', 'phase', 'fn', 'effect', 'requires', 'options'];
+  function validateModifiers(modifiers) {
+    modifiers.forEach(function (modifier) {
+      Object.keys(modifier).forEach(function (key) {
+        switch (key) {
+          case 'name':
+            if (typeof modifier.name !== 'string') {
+              console.error(format(INVALID_MODIFIER_ERROR, String(modifier.name), '"name"', '"string"', "\"" + String(modifier.name) + "\""));
+            }
+
+            break;
+
+          case 'enabled':
+            if (typeof modifier.enabled !== 'boolean') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"enabled"', '"boolean"', "\"" + String(modifier.enabled) + "\""));
+            }
+
+          case 'phase':
+            if (modifierPhases.indexOf(modifier.phase) < 0) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"phase"', "either " + modifierPhases.join(', '), "\"" + String(modifier.phase) + "\""));
+            }
+
+            break;
+
+          case 'fn':
+            if (typeof modifier.fn !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"fn"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'effect':
+            if (typeof modifier.effect !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"effect"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'requires':
+            if (!Array.isArray(modifier.requires)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requires"', '"array"', "\"" + String(modifier.requires) + "\""));
+            }
+
+            break;
+
+          case 'requiresIfExists':
+            if (!Array.isArray(modifier.requiresIfExists)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requiresIfExists"', '"array"', "\"" + String(modifier.requiresIfExists) + "\""));
+            }
+
+            break;
+
+          case 'options':
+          case 'data':
+            break;
+
+          default:
+            console.error("PopperJS: an invalid property has been provided to the \"" + modifier.name + "\" modifier, valid properties are " + VALID_PROPERTIES.map(function (s) {
+              return "\"" + s + "\"";
+            }).join(', ') + "; but \"" + key + "\" was provided.");
+        }
+
+        modifier.requires && modifier.requires.forEach(function (requirement) {
+          if (modifiers.find(function (mod) {
+            return mod.name === requirement;
+          }) == null) {
+            console.error(format(MISSING_DEPENDENCY_ERROR, String(modifier.name), requirement, requirement));
+          }
+        });
+      });
+    });
+  }
+
+  function uniqueBy(arr, fn) {
+    var identifiers = new Set();
+    return arr.filter(function (item) {
+      var identifier = fn(item);
+
+      if (!identifiers.has(identifier)) {
+        identifiers.add(identifier);
+        return true;
+      }
+    });
+  }
+
+  function getBasePlacement(placement) {
+    return placement.split('-')[0];
+  }
+
+  function mergeByName(modifiers) {
+    var merged = modifiers.reduce(function (merged, current) {
+      var existing = merged[current.name];
+      merged[current.name] = existing ? Object.assign(Object.assign(Object.assign({}, existing), current), {}, {
+        options: Object.assign(Object.assign({}, existing.options), current.options),
+        data: Object.assign(Object.assign({}, existing.data), current.data)
+      }) : current;
+      return merged;
+    }, {}); // IE11 does not support Object.values
+
+    return Object.keys(merged).map(function (key) {
+      return merged[key];
+    });
+  }
+
+  function getViewportRect(element) {
+    var win = getWindow(element);
+    var html = getDocumentElement(element);
+    var visualViewport = win.visualViewport;
+    var width = html.clientWidth;
+    var height = html.clientHeight;
+    var x = 0;
+    var y = 0; // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper
+    // can be obscured underneath it.
+    // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even
+    // if it isn't open, so if this isn't available, the popper will be detected
+    // to overflow the bottom of the screen too early.
+
+    if (visualViewport) {
+      width = visualViewport.width;
+      height = visualViewport.height; // Uses Layout Viewport (like Chrome; Safari does not currently)
+      // In Chrome, it returns a value very close to 0 (+/-) but contains rounding
+      // errors due to floating point numbers, so we need to check precision.
+      // Safari returns a number <= 0, usually < -1 when pinch-zoomed
+      // Feature detection fails in mobile emulation mode in Chrome.
+      // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <
+      // 0.001
+      // Fallback here: "Not Safari" userAgent
+
+      if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
+        x = visualViewport.offsetLeft;
+        y = visualViewport.offsetTop;
+      }
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x + getWindowScrollBarX(element),
+      y: y
+    };
+  }
+
+  // of the `<html>` and `<body>` rect bounds if horizontally scrollable
+
+  function getDocumentRect(element) {
+    var html = getDocumentElement(element);
+    var winScroll = getWindowScroll(element);
+    var body = element.ownerDocument.body;
+    var width = Math.max(html.scrollWidth, html.clientWidth, body ? body.scrollWidth : 0, body ? body.clientWidth : 0);
+    var height = Math.max(html.scrollHeight, html.clientHeight, body ? body.scrollHeight : 0, body ? body.clientHeight : 0);
+    var x = -winScroll.scrollLeft + getWindowScrollBarX(element);
+    var y = -winScroll.scrollTop;
+
+    if (getComputedStyle(body || html).direction === 'rtl') {
+      x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x,
+      y: y
+    };
+  }
+
+  function contains(parent, child) {
+    var rootNode = child.getRootNode && child.getRootNode(); // First, attempt with faster native method
+
+    if (parent.contains(child)) {
+      return true;
+    } // then fallback to custom implementation with Shadow DOM support
+    else if (rootNode && isShadowRoot(rootNode)) {
+        var next = child;
+
+        do {
+          if (next && parent.isSameNode(next)) {
+            return true;
+          } // $FlowFixMe: need a better way to handle this...
+
+
+          next = next.parentNode || next.host;
+        } while (next);
+      } // Give up, the result is false
+
+
+    return false;
+  }
+
+  function rectToClientRect(rect) {
+    return Object.assign(Object.assign({}, rect), {}, {
+      left: rect.x,
+      top: rect.y,
+      right: rect.x + rect.width,
+      bottom: rect.y + rect.height
+    });
+  }
+
+  function getInnerBoundingClientRect(element) {
+    var rect = getBoundingClientRect(element);
+    rect.top = rect.top + element.clientTop;
+    rect.left = rect.left + element.clientLeft;
+    rect.bottom = rect.top + element.clientHeight;
+    rect.right = rect.left + element.clientWidth;
+    rect.width = element.clientWidth;
+    rect.height = element.clientHeight;
+    rect.x = rect.left;
+    rect.y = rect.top;
+    return rect;
+  }
+
+  function getClientRectFromMixedType(element, clippingParent) {
+    return clippingParent === viewport ? rectToClientRect(getViewportRect(element)) : isHTMLElement(clippingParent) ? getInnerBoundingClientRect(clippingParent) : rectToClientRect(getDocumentRect(getDocumentElement(element)));
+  } // A "clipping parent" is an overflowable container with the characteristic of
+  // clipping (or hiding) overflowing elements with a position different from
+  // `initial`
+
+
+  function getClippingParents(element) {
+    var clippingParents = listScrollParents(getParentNode(element));
+    var canEscapeClipping = ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;
+    var clipperElement = canEscapeClipping && isHTMLElement(element) ? getOffsetParent(element) : element;
+
+    if (!isElement(clipperElement)) {
+      return [];
+    } // $FlowFixMe: https://github.com/facebook/flow/issues/1414
+
+
+    return clippingParents.filter(function (clippingParent) {
+      return isElement(clippingParent) && contains(clippingParent, clipperElement) && getNodeName(clippingParent) !== 'body';
+    });
+  } // Gets the maximum area that the element is visible in due to any number of
+  // clipping parents
+
+
+  function getClippingRect(element, boundary, rootBoundary) {
+    var mainClippingParents = boundary === 'clippingParents' ? getClippingParents(element) : [].concat(boundary);
+    var clippingParents = [].concat(mainClippingParents, [rootBoundary]);
+    var firstClippingParent = clippingParents[0];
+    var clippingRect = clippingParents.reduce(function (accRect, clippingParent) {
+      var rect = getClientRectFromMixedType(element, clippingParent);
+      accRect.top = Math.max(rect.top, accRect.top);
+      accRect.right = Math.min(rect.right, accRect.right);
+      accRect.bottom = Math.min(rect.bottom, accRect.bottom);
+      accRect.left = Math.max(rect.left, accRect.left);
+      return accRect;
+    }, getClientRectFromMixedType(element, firstClippingParent));
+    clippingRect.width = clippingRect.right - clippingRect.left;
+    clippingRect.height = clippingRect.bottom - clippingRect.top;
+    clippingRect.x = clippingRect.left;
+    clippingRect.y = clippingRect.top;
+    return clippingRect;
+  }
+
+  function getVariation(placement) {
+    return placement.split('-')[1];
+  }
+
+  function getMainAxisFromPlacement(placement) {
+    return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';
+  }
+
+  function computeOffsets(_ref) {
+    var reference = _ref.reference,
+        element = _ref.element,
+        placement = _ref.placement;
+    var basePlacement = placement ? getBasePlacement(placement) : null;
+    var variation = placement ? getVariation(placement) : null;
+    var commonX = reference.x + reference.width / 2 - element.width / 2;
+    var commonY = reference.y + reference.height / 2 - element.height / 2;
+    var offsets;
+
+    switch (basePlacement) {
+      case top:
+        offsets = {
+          x: commonX,
+          y: reference.y - element.height
+        };
+        break;
+
+      case bottom:
+        offsets = {
+          x: commonX,
+          y: reference.y + reference.height
+        };
+        break;
+
+      case right:
+        offsets = {
+          x: reference.x + reference.width,
+          y: commonY
+        };
+        break;
+
+      case left:
+        offsets = {
+          x: reference.x - element.width,
+          y: commonY
+        };
+        break;
+
+      default:
+        offsets = {
+          x: reference.x,
+          y: reference.y
+        };
+    }
+
+    var mainAxis = basePlacement ? getMainAxisFromPlacement(basePlacement) : null;
+
+    if (mainAxis != null) {
+      var len = mainAxis === 'y' ? 'height' : 'width';
+
+      switch (variation) {
+        case start:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) - Math.floor(reference[len] / 2 - element[len] / 2);
+          break;
+
+        case end:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) + Math.ceil(reference[len] / 2 - element[len] / 2);
+          break;
+      }
+    }
+
+    return offsets;
+  }
+
+  function getFreshSideObject() {
+    return {
+      top: 0,
+      right: 0,
+      bottom: 0,
+      left: 0
+    };
+  }
+
+  function mergePaddingObject(paddingObject) {
+    return Object.assign(Object.assign({}, getFreshSideObject()), paddingObject);
+  }
+
+  function expandToHashMap(value, keys) {
+    return keys.reduce(function (hashMap, key) {
+      hashMap[key] = value;
+      return hashMap;
+    }, {});
+  }
+
+  function detectOverflow(state, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    var _options = options,
+        _options$placement = _options.placement,
+        placement = _options$placement === void 0 ? state.placement : _options$placement,
+        _options$boundary = _options.boundary,
+        boundary = _options$boundary === void 0 ? clippingParents : _options$boundary,
+        _options$rootBoundary = _options.rootBoundary,
+        rootBoundary = _options$rootBoundary === void 0 ? viewport : _options$rootBoundary,
+        _options$elementConte = _options.elementContext,
+        elementContext = _options$elementConte === void 0 ? popper : _options$elementConte,
+        _options$altBoundary = _options.altBoundary,
+        altBoundary = _options$altBoundary === void 0 ? false : _options$altBoundary,
+        _options$padding = _options.padding,
+        padding = _options$padding === void 0 ? 0 : _options$padding;
+    var paddingObject = mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
+    var altContext = elementContext === popper ? reference : popper;
+    var referenceElement = state.elements.reference;
+    var popperRect = state.rects.popper;
+    var element = state.elements[altBoundary ? altContext : elementContext];
+    var clippingClientRect = getClippingRect(isElement(element) ? element : element.contextElement || getDocumentElement(state.elements.popper), boundary, rootBoundary);
+    var referenceClientRect = getBoundingClientRect(referenceElement);
+    var popperOffsets = computeOffsets({
+      reference: referenceClientRect,
+      element: popperRect,
+      strategy: 'absolute',
+      placement: placement
+    });
+    var popperClientRect = rectToClientRect(Object.assign(Object.assign({}, popperRect), popperOffsets));
+    var elementClientRect = elementContext === popper ? popperClientRect : referenceClientRect; // positive = overflowing the clipping rect
+    // 0 or negative = within the clipping rect
+
+    var overflowOffsets = {
+      top: clippingClientRect.top - elementClientRect.top + paddingObject.top,
+      bottom: elementClientRect.bottom - clippingClientRect.bottom + paddingObject.bottom,
+      left: clippingClientRect.left - elementClientRect.left + paddingObject.left,
+      right: elementClientRect.right - clippingClientRect.right + paddingObject.right
+    };
+    var offsetData = state.modifiersData.offset; // Offsets can be applied only to the popper element
+
+    if (elementContext === popper && offsetData) {
+      var offset = offsetData[placement];
+      Object.keys(overflowOffsets).forEach(function (key) {
+        var multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;
+        var axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';
+        overflowOffsets[key] += offset[axis] * multiply;
+      });
+    }
+
+    return overflowOffsets;
+  }
+
+  var INVALID_ELEMENT_ERROR = 'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';
+  var INFINITE_LOOP_ERROR = 'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';
+  var DEFAULT_OPTIONS = {
+    placement: 'bottom',
+    modifiers: [],
+    strategy: 'absolute'
+  };
+
+  function areValidElements() {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    return !args.some(function (element) {
+      return !(element && typeof element.getBoundingClientRect === 'function');
+    });
+  }
+
+  function popperGenerator(generatorOptions) {
+    if (generatorOptions === void 0) {
+      generatorOptions = {};
+    }
+
+    var _generatorOptions = generatorOptions,
+        _generatorOptions$def = _generatorOptions.defaultModifiers,
+        defaultModifiers = _generatorOptions$def === void 0 ? [] : _generatorOptions$def,
+        _generatorOptions$def2 = _generatorOptions.defaultOptions,
+        defaultOptions = _generatorOptions$def2 === void 0 ? DEFAULT_OPTIONS : _generatorOptions$def2;
+    return function createPopper(reference, popper, options) {
+      if (options === void 0) {
+        options = defaultOptions;
+      }
+
+      var state = {
+        placement: 'bottom',
+        orderedModifiers: [],
+        options: Object.assign(Object.assign({}, DEFAULT_OPTIONS), defaultOptions),
+        modifiersData: {},
+        elements: {
+          reference: reference,
+          popper: popper
+        },
+        attributes: {},
+        styles: {}
+      };
+      var effectCleanupFns = [];
+      var isDestroyed = false;
+      var instance = {
+        state: state,
+        setOptions: function setOptions(options) {
+          cleanupModifierEffects();
+          state.options = Object.assign(Object.assign(Object.assign({}, defaultOptions), state.options), options);
+          state.scrollParents = {
+            reference: isElement(reference) ? listScrollParents(reference) : reference.contextElement ? listScrollParents(reference.contextElement) : [],
+            popper: listScrollParents(popper)
+          }; // Orders the modifiers based on their dependencies and `phase`
+          // properties
+
+          var orderedModifiers = orderModifiers(mergeByName([].concat(defaultModifiers, state.options.modifiers))); // Strip out disabled modifiers
+
+          state.orderedModifiers = orderedModifiers.filter(function (m) {
+            return m.enabled;
+          }); // Validate the provided modifiers so that the consumer will get warned
+          // if one of the modifiers is invalid for any reason
+
+          {
+            var modifiers = uniqueBy([].concat(orderedModifiers, state.options.modifiers), function (_ref) {
+              var name = _ref.name;
+              return name;
+            });
+            validateModifiers(modifiers);
+
+            if (getBasePlacement(state.options.placement) === auto) {
+              var flipModifier = state.orderedModifiers.find(function (_ref2) {
+                var name = _ref2.name;
+                return name === 'flip';
+              });
+
+              if (!flipModifier) {
+                console.error(['Popper: "auto" placements require the "flip" modifier be', 'present and enabled to work.'].join(' '));
+              }
+            }
+
+            var _getComputedStyle = getComputedStyle(popper),
+                marginTop = _getComputedStyle.marginTop,
+                marginRight = _getComputedStyle.marginRight,
+                marginBottom = _getComputedStyle.marginBottom,
+                marginLeft = _getComputedStyle.marginLeft; // We no longer take into account `margins` on the popper, and it can
+            // cause bugs with positioning, so we'll warn the consumer
+
+
+            if ([marginTop, marginRight, marginBottom, marginLeft].some(function (margin) {
+              return parseFloat(margin);
+            })) {
+              console.warn(['Popper: CSS "margin" styles cannot be used to apply padding', 'between the popper and its reference element or boundary.', 'To replicate margin, use the `offset` modifier, as well as', 'the `padding` option in the `preventOverflow` and `flip`', 'modifiers.'].join(' '));
+            }
+          }
+
+          runModifierEffects();
+          return instance.update();
+        },
+        // Sync update – it will always be executed, even if not necessary. This
+        // is useful for low frequency updates where sync behavior simplifies the
+        // logic.
+        // For high frequency updates (e.g. `resize` and `scroll` events), always
+        // prefer the async Popper#update method
+        forceUpdate: function forceUpdate() {
+          if (isDestroyed) {
+            return;
+          }
+
+          var _state$elements = state.elements,
+              reference = _state$elements.reference,
+              popper = _state$elements.popper; // Don't proceed if `reference` or `popper` are not valid elements
+          // anymore
+
+          if (!areValidElements(reference, popper)) {
+            {
+              console.error(INVALID_ELEMENT_ERROR);
+            }
+
+            return;
+          } // Store the reference and popper rects to be read by modifiers
+
+
+          state.rects = {
+            reference: getCompositeRect(reference, getOffsetParent(popper), state.options.strategy === 'fixed'),
+            popper: getLayoutRect(popper)
+          }; // Modifiers have the ability to reset the current update cycle. The
+          // most common use case for this is the `flip` modifier changing the
+          // placement, which then needs to re-run all the modifiers, because the
+          // logic was previously ran for the previous placement and is therefore
+          // stale/incorrect
+
+          state.reset = false;
+          state.placement = state.options.placement; // On each update cycle, the `modifiersData` property for each modifier
+          // is filled with the initial data specified by the modifier. This means
+          // it doesn't persist and is fresh on each update.
+          // To ensure persistent data, use `${name}#persistent`
+
+          state.orderedModifiers.forEach(function (modifier) {
+            return state.modifiersData[modifier.name] = Object.assign({}, modifier.data);
+          });
+          var __debug_loops__ = 0;
+
+          for (var index = 0; index < state.orderedModifiers.length; index++) {
+            {
+              __debug_loops__ += 1;
+
+              if (__debug_loops__ > 100) {
+                console.error(INFINITE_LOOP_ERROR);
+                break;
+              }
+            }
+
+            if (state.reset === true) {
+              state.reset = false;
+              index = -1;
+              continue;
+            }
+
+            var _state$orderedModifie = state.orderedModifiers[index],
+                fn = _state$orderedModifie.fn,
+                _state$orderedModifie2 = _state$orderedModifie.options,
+                _options = _state$orderedModifie2 === void 0 ? {} : _state$orderedModifie2,
+                name = _state$orderedModifie.name;
+
+            if (typeof fn === 'function') {
+              state = fn({
+                state: state,
+                options: _options,
+                name: name,
+                instance: instance
+              }) || state;
+            }
+          }
+        },
+        // Async and optimistically optimized update – it will not be executed if
+        // not necessary (debounced to run at most once-per-tick)
+        update: debounce(function () {
+          return new Promise(function (resolve) {
+            instance.forceUpdate();
+            resolve(state);
+          });
+        }),
+        destroy: function destroy() {
+          cleanupModifierEffects();
+          isDestroyed = true;
+        }
+      };
+
+      if (!areValidElements(reference, popper)) {
+        {
+          console.error(INVALID_ELEMENT_ERROR);
+        }
+
+        return instance;
+      }
+
+      instance.setOptions(options).then(function (state) {
+        if (!isDestroyed && options.onFirstUpdate) {
+          options.onFirstUpdate(state);
+        }
+      }); // Modifiers have the ability to execute arbitrary code before the first
+      // update cycle runs. They will be executed in the same order as the update
+      // cycle. This is useful when a modifier adds some persistent data that
+      // other modifiers need to use, but the modifier is run after the dependent
+      // one.
+
+      function runModifierEffects() {
+        state.orderedModifiers.forEach(function (_ref3) {
+          var name = _ref3.name,
+              _ref3$options = _ref3.options,
+              options = _ref3$options === void 0 ? {} : _ref3$options,
+              effect = _ref3.effect;
+
+          if (typeof effect === 'function') {
+            var cleanupFn = effect({
+              state: state,
+              name: name,
+              instance: instance,
+              options: options
+            });
+
+            var noopFn = function noopFn() {};
+
+            effectCleanupFns.push(cleanupFn || noopFn);
+          }
+        });
+      }
+
+      function cleanupModifierEffects() {
+        effectCleanupFns.forEach(function (fn) {
+          return fn();
+        });
+        effectCleanupFns = [];
+      }
+
+      return instance;
+    };
+  }
+  var createPopper = /*#__PURE__*/popperGenerator(); // eslint-disable-next-line import/no-unused-modules
+
+  exports.createPopper = createPopper;
+  exports.detectOverflow = detectOverflow;
+  exports.popperGenerator = popperGenerator;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=popper-base.js.map
diff --git a/web-tools/web/_static/popperjs/popper-base.js.map b/web-tools/web/_static/popperjs/popper-base.js.map
new file mode 100644
index 0000000..49fc9a8
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-base.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper-base.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getLayoutRect.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/isTableElement.js","../../src/dom-utils/getOffsetParent.js","../../src/enums.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/format.js","../../src/utils/validateModifiers.js","../../src/utils/uniqueBy.js","../../src/utils/getBasePlacement.js","../../src/utils/mergeByName.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/dom-utils/contains.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/utils/getVariation.js","../../src/utils/getMainAxisFromPlacement.js","../../src/utils/computeOffsets.js","../../src/utils/getFreshSideObject.js","../../src/utils/mergePaddingObject.js","../../src/utils/expandToHashMap.js","../../src/utils/detectOverflow.js","../../src/createPopper.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\n\nexport default function format(str: string, ...args: Array<string>) {\n  return [...args].reduce((p, c) => p.replace(/%s/, c), str);\n}\n","// @flow\nimport format from './format';\nimport { modifierPhases } from '../enums';\n\nconst INVALID_MODIFIER_ERROR =\n  'Popper: modifier \"%s\" provided an invalid %s property, expected %s but got %s';\nconst MISSING_DEPENDENCY_ERROR =\n  'Popper: modifier \"%s\" requires \"%s\", but \"%s\" modifier is not available';\nconst VALID_PROPERTIES = [\n  'name',\n  'enabled',\n  'phase',\n  'fn',\n  'effect',\n  'requires',\n  'options',\n];\n\nexport default function validateModifiers(modifiers: Array<any>): void {\n  modifiers.forEach(modifier => {\n    Object.keys(modifier).forEach(key => {\n      switch (key) {\n        case 'name':\n          if (typeof modifier.name !== 'string') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                String(modifier.name),\n                '\"name\"',\n                '\"string\"',\n                `\"${String(modifier.name)}\"`\n              )\n            );\n          }\n          break;\n        case 'enabled':\n          if (typeof modifier.enabled !== 'boolean') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"enabled\"',\n                '\"boolean\"',\n                `\"${String(modifier.enabled)}\"`\n              )\n            );\n          }\n        case 'phase':\n          if (modifierPhases.indexOf(modifier.phase) < 0) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"phase\"',\n                `either ${modifierPhases.join(', ')}`,\n                `\"${String(modifier.phase)}\"`\n              )\n            );\n          }\n          break;\n        case 'fn':\n          if (typeof modifier.fn !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"fn\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'effect':\n          if (typeof modifier.effect !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"effect\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'requires':\n          if (!Array.isArray(modifier.requires)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requires\"',\n                '\"array\"',\n                `\"${String(modifier.requires)}\"`\n              )\n            );\n          }\n          break;\n        case 'requiresIfExists':\n          if (!Array.isArray(modifier.requiresIfExists)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requiresIfExists\"',\n                '\"array\"',\n                `\"${String(modifier.requiresIfExists)}\"`\n              )\n            );\n          }\n          break;\n        case 'options':\n        case 'data':\n          break;\n        default:\n          console.error(\n            `PopperJS: an invalid property has been provided to the \"${\n              modifier.name\n            }\" modifier, valid properties are ${VALID_PROPERTIES.map(\n              s => `\"${s}\"`\n            ).join(', ')}; but \"${key}\" was provided.`\n          );\n      }\n\n      modifier.requires &&\n        modifier.requires.forEach(requirement => {\n          if (modifiers.find(mod => mod.name === requirement) == null) {\n            console.error(\n              format(\n                MISSING_DEPENDENCY_ERROR,\n                String(modifier.name),\n                requirement,\n                requirement\n              )\n            );\n          }\n        });\n    });\n  });\n}\n","// @flow\n\nexport default function uniqueBy<T>(arr: Array<T>, fn: T => any): Array<T> {\n  const identifiers = new Set();\n\n  return arr.filter(item => {\n    const identifier = fn(item);\n\n    if (!identifiers.has(identifier)) {\n      identifiers.add(identifier);\n      return true;\n    }\n  });\n}\n","// @flow\nimport { type BasePlacement, type Placement, auto } from '../enums';\n\nexport default function getBasePlacement(\n  placement: Placement | typeof auto\n): BasePlacement {\n  return (placement.split('-')[0]: any);\n}\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nimport { type Variation, type Placement } from '../enums';\n\nexport default function getVariation(placement: Placement): ?Variation {\n  return (placement.split('-')[1]: any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nexport default function getMainAxisFromPlacement(\n  placement: Placement\n): 'x' | 'y' {\n  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';\n}\n","// @flow\nimport getBasePlacement from './getBasePlacement';\nimport getVariation from './getVariation';\nimport getMainAxisFromPlacement from './getMainAxisFromPlacement';\nimport type {\n  Rect,\n  PositioningStrategy,\n  Offsets,\n  ClientRectObject,\n} from '../types';\nimport { top, right, bottom, left, start, end, type Placement } from '../enums';\n\nexport default function computeOffsets({\n  reference,\n  element,\n  placement,\n}: {\n  reference: Rect | ClientRectObject,\n  element: Rect | ClientRectObject,\n  strategy: PositioningStrategy,\n  placement?: Placement,\n}): Offsets {\n  const basePlacement = placement ? getBasePlacement(placement) : null;\n  const variation = placement ? getVariation(placement) : null;\n  const commonX = reference.x + reference.width / 2 - element.width / 2;\n  const commonY = reference.y + reference.height / 2 - element.height / 2;\n\n  let offsets;\n  switch (basePlacement) {\n    case top:\n      offsets = {\n        x: commonX,\n        y: reference.y - element.height,\n      };\n      break;\n    case bottom:\n      offsets = {\n        x: commonX,\n        y: reference.y + reference.height,\n      };\n      break;\n    case right:\n      offsets = {\n        x: reference.x + reference.width,\n        y: commonY,\n      };\n      break;\n    case left:\n      offsets = {\n        x: reference.x - element.width,\n        y: commonY,\n      };\n      break;\n    default:\n      offsets = {\n        x: reference.x,\n        y: reference.y,\n      };\n  }\n\n  const mainAxis = basePlacement\n    ? getMainAxisFromPlacement(basePlacement)\n    : null;\n\n  if (mainAxis != null) {\n    const len = mainAxis === 'y' ? 'height' : 'width';\n\n    switch (variation) {\n      case start:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) -\n          Math.floor(reference[len] / 2 - element[len] / 2);\n        break;\n      case end:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) +\n          Math.ceil(reference[len] / 2 - element[len] / 2);\n        break;\n      default:\n    }\n  }\n\n  return offsets;\n}\n","// @flow\nimport type { SideObject } from '../types';\n\nexport default function getFreshSideObject(): SideObject {\n  return {\n    top: 0,\n    right: 0,\n    bottom: 0,\n    left: 0,\n  };\n}\n","// @flow\nimport type { SideObject } from '../types';\nimport getFreshSideObject from './getFreshSideObject';\n\nexport default function mergePaddingObject(\n  paddingObject: $Shape<SideObject>\n): SideObject {\n  return {\n    ...getFreshSideObject(),\n    ...paddingObject,\n  };\n}\n","// @flow\n\nexport default function expandToHashMap<\n  T: number | string | boolean,\n  K: string\n>(value: T, keys: Array<K>): { [key: string]: T } {\n  return keys.reduce((hashMap, key) => {\n    hashMap[key] = value;\n    return hashMap;\n  }, {});\n}\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';\n      overflowOffsets[key] += offset[axis] * multiply;\n    });\n  }\n\n  return overflowOffsets;\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow 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diff --git a/web-tools/web/_static/popperjs/popper-base.min.js b/web-tools/web/_static/popperjs/popper-base.min.js
new file mode 100644
index 0000000..7dc781b
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-base.min.js
@@ -0,0 +1,6 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
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0===o?{}:o,"function"==typeof(t=t.effect)&&(e=t({state:a,name:e,instance:l,options:o}),c.push(e||function(){}))})),l.update()},forceUpdate:function(){if(!s){var t=a.elements,e=t.reference;if(x(e,t=t.popper))for(a.rects={reference:u(e,m(t),"fixed"===a.options.strategy),popper:{x:t.offsetLeft,y:t.offsetTop,width:t.offsetWidth,height:t.offsetHeight}},a.reset=!1,a.placement=a.options.placement,a.orderedModifiers.forEach((function(t){return a.modifiersData[t.name]=Object.assign({},t.data)})),e=0;e<a.orderedModifiers.length;e++)if(!0===a.reset)a.reset=!1,e=-1;else{var o=a.orderedModifiers[e];t=o.fn;var n=o.options;n=void 0===n?{}:n,o=o.name,"function"==typeof t&&(a=t({state:a,options:n,name:o,instance:l})||a)}}},update:b((function(){return new Promise((function(t){l.forceUpdate(),t(a)}))})),destroy:function(){f(),s=!0}};return x(t,e)?(l.setOptions(r).then((function(t){!s&&r.onFirstUpdate&&r.onFirstUpdate(t)})),l):l}}var j=["top","bottom","right","left"],M="beforeRead read afterRead beforeMain main afterMain beforeWrite write afterWrite".split(" "),E={placement:"bottom",modifiers:[],strategy:"absolute"},L=O();t.createPopper=L,t.detectOverflow=function(t,o){void 0===o&&(o={});var n=o;o=void 0===(o=n.placement)?t.placement:o;var r=n.boundary,f=void 0===r?"clippingParents":r,c=void 0===(r=n.rootBoundary)?"viewport":r;r=void 0===(r=n.elementContext)?"popper":r;var s=n.altBoundary,l=void 0!==s&&s;n=function(t){return Object.assign(Object.assign({},{top:0,right:0,bottom:0,left:0}),t)}("number"!=typeof(n=void 0===(n=n.padding)?0:n)?n:function(t,e){return e.reduce((function(e,o){return e[o]=t,e}),{})}(n,j));var u=t.elements.reference;s=t.rects.popper,f=w(i(l=t.elements[l?"popper"===r?"reference":"popper":r])?l:l.contextElement||a(t.elements.popper),f,c),l=function(t){var e=t.reference,o=t.element,n=(t=t.placement)?t.split("-")[0]:null;t=t?t.split("-")[1]:null;var i=e.x+e.width/2-o.width/2,r=e.y+e.height/2-o.height/2;switch(n){case"top":i={x:i,y:e.y-o.height};break;case"bottom":i={x:i,y:e.y+e.height};break;case"right":i={x:e.x+e.width,y:r};break;case"left":i={x:e.x-o.width,y:r};break;default:i={x:e.x,y:e.y}}if(null!=(n=n?0<=["top","bottom"].indexOf(n)?"x":"y":null))switch(r="y"===n?"height":"width",t){case"start":i[n]=Math.floor(i[n])-Math.floor(e[r]/2-o[r]/2);break;case"end":i[n]=Math.floor(i[n])+Math.ceil(e[r]/2-o[r]/2)}return i}({reference:c=e(u),element:s,strategy:"absolute",placement:o}),s=v(Object.assign(Object.assign({},s),l)),c="popper"===r?s:c;var d={top:f.top-c.top+n.top,bottom:c.bottom-f.bottom+n.bottom,left:f.left-c.left+n.left,right:c.right-f.right+n.right};if(t=t.modifiersData.offset,"popper"===r&&t){var p=t[o];Object.keys(d).forEach((function(t){var e=0<=["right","bottom"].indexOf(t)?1:-1,o=0<=["top","bottom"].indexOf(t)?"y":"x";d[t]+=p[o]*e}))}return d},t.popperGenerator=O,Object.defineProperty(t,"__esModule",{value:!0})}));
+//# sourceMappingURL=popper-base.min.js.map
diff --git a/web-tools/web/_static/popperjs/popper-base.min.js.flow b/web-tools/web/_static/popperjs/popper-base.min.js.flow
new file mode 100644
index 0000000..22d88eb
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-base.min.js.flow
@@ -0,0 +1,3 @@
+// @flow
+
+export * from '../../lib/popper-base.js'
diff --git a/web-tools/web/_static/popperjs/popper-base.min.js.map b/web-tools/web/_static/popperjs/popper-base.min.js.map
new file mode 100644
index 0000000..bc30ffa
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-base.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper-base.min.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/getOffsetParent.js","../../src/dom-utils/isTableElement.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/enums.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/dom-utils/contains.js","../../src/createPopper.js","../../src/utils/mergeByName.js","../../src/dom-utils/getLayoutRect.js","../../src/utils/detectOverflow.js","../../src/utils/mergePaddingObject.js","../../src/utils/getFreshSideObject.js","../../src/utils/expandToHashMap.js","../../src/utils/computeOffsets.js","../../src/utils/getBasePlacement.js","../../src/utils/getVariation.js","../../src/utils/getMainAxisFromPlacement.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow };\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 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+\ No newline at end of file
diff --git a/web-tools/web/_static/popperjs/popper-lite.js b/web-tools/web/_static/popperjs/popper-lite.js
new file mode 100644
index 0000000..af5ab8c
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-lite.js
@@ -0,0 +1,1324 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = global || self, factory(global.Popper = {}));
+}(this, (function (exports) { 'use strict';
+
+  function getBoundingClientRect(element) {
+    var rect = element.getBoundingClientRect();
+    return {
+      width: rect.width,
+      height: rect.height,
+      top: rect.top,
+      right: rect.right,
+      bottom: rect.bottom,
+      left: rect.left,
+      x: rect.left,
+      y: rect.top
+    };
+  }
+
+  /*:: import type { Window } from '../types'; */
+
+  /*:: declare function getWindow(node: Node | Window): Window; */
+  function getWindow(node) {
+    if (node.toString() !== '[object Window]') {
+      var ownerDocument = node.ownerDocument;
+      return ownerDocument ? ownerDocument.defaultView || window : window;
+    }
+
+    return node;
+  }
+
+  function getWindowScroll(node) {
+    var win = getWindow(node);
+    var scrollLeft = win.pageXOffset;
+    var scrollTop = win.pageYOffset;
+    return {
+      scrollLeft: scrollLeft,
+      scrollTop: scrollTop
+    };
+  }
+
+  /*:: declare function isElement(node: mixed): boolean %checks(node instanceof
+    Element); */
+
+  function isElement(node) {
+    var OwnElement = getWindow(node).Element;
+    return node instanceof OwnElement || node instanceof Element;
+  }
+  /*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof
+    HTMLElement); */
+
+
+  function isHTMLElement(node) {
+    var OwnElement = getWindow(node).HTMLElement;
+    return node instanceof OwnElement || node instanceof HTMLElement;
+  }
+  /*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof
+    ShadowRoot); */
+
+
+  function isShadowRoot(node) {
+    var OwnElement = getWindow(node).ShadowRoot;
+    return node instanceof OwnElement || node instanceof ShadowRoot;
+  }
+
+  function getHTMLElementScroll(element) {
+    return {
+      scrollLeft: element.scrollLeft,
+      scrollTop: element.scrollTop
+    };
+  }
+
+  function getNodeScroll(node) {
+    if (node === getWindow(node) || !isHTMLElement(node)) {
+      return getWindowScroll(node);
+    } else {
+      return getHTMLElementScroll(node);
+    }
+  }
+
+  function getNodeName(element) {
+    return element ? (element.nodeName || '').toLowerCase() : null;
+  }
+
+  function getDocumentElement(element) {
+    // $FlowFixMe: assume body is always available
+    return ((isElement(element) ? element.ownerDocument : element.document) || window.document).documentElement;
+  }
+
+  function getWindowScrollBarX(element) {
+    // If <html> has a CSS width greater than the viewport, then this will be
+    // incorrect for RTL.
+    // Popper 1 is broken in this case and never had a bug report so let's assume
+    // it's not an issue. I don't think anyone ever specifies width on <html>
+    // anyway.
+    // Browsers where the left scrollbar doesn't cause an issue report `0` for
+    // this (e.g. Edge 2019, IE11, Safari)
+    return getBoundingClientRect(getDocumentElement(element)).left + getWindowScroll(element).scrollLeft;
+  }
+
+  function getComputedStyle(element) {
+    return getWindow(element).getComputedStyle(element);
+  }
+
+  function isScrollParent(element) {
+    // Firefox wants us to check `-x` and `-y` variations as well
+    var _getComputedStyle = getComputedStyle(element),
+        overflow = _getComputedStyle.overflow,
+        overflowX = _getComputedStyle.overflowX,
+        overflowY = _getComputedStyle.overflowY;
+
+    return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);
+  }
+
+  // Composite means it takes into account transforms as well as layout.
+
+  function getCompositeRect(elementOrVirtualElement, offsetParent, isFixed) {
+    if (isFixed === void 0) {
+      isFixed = false;
+    }
+
+    var documentElement = getDocumentElement(offsetParent);
+    var rect = getBoundingClientRect(elementOrVirtualElement);
+    var isOffsetParentAnElement = isHTMLElement(offsetParent);
+    var scroll = {
+      scrollLeft: 0,
+      scrollTop: 0
+    };
+    var offsets = {
+      x: 0,
+      y: 0
+    };
+
+    if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
+      if (getNodeName(offsetParent) !== 'body' || // https://github.com/popperjs/popper-core/issues/1078
+      isScrollParent(documentElement)) {
+        scroll = getNodeScroll(offsetParent);
+      }
+
+      if (isHTMLElement(offsetParent)) {
+        offsets = getBoundingClientRect(offsetParent);
+        offsets.x += offsetParent.clientLeft;
+        offsets.y += offsetParent.clientTop;
+      } else if (documentElement) {
+        offsets.x = getWindowScrollBarX(documentElement);
+      }
+    }
+
+    return {
+      x: rect.left + scroll.scrollLeft - offsets.x,
+      y: rect.top + scroll.scrollTop - offsets.y,
+      width: rect.width,
+      height: rect.height
+    };
+  }
+
+  // Returns the layout rect of an element relative to its offsetParent. Layout
+  // means it doesn't take into account transforms.
+  function getLayoutRect(element) {
+    return {
+      x: element.offsetLeft,
+      y: element.offsetTop,
+      width: element.offsetWidth,
+      height: element.offsetHeight
+    };
+  }
+
+  function getParentNode(element) {
+    if (getNodeName(element) === 'html') {
+      return element;
+    }
+
+    return (// $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle
+      element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
+      element.parentNode || // DOM Element detected
+      // $FlowFixMe: need a better way to handle this...
+      element.host || // ShadowRoot detected
+      // $FlowFixMe: HTMLElement is a Node
+      getDocumentElement(element) // fallback
+
+    );
+  }
+
+  function getScrollParent(node) {
+    if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {
+      // $FlowFixMe: assume body is always available
+      return node.ownerDocument.body;
+    }
+
+    if (isHTMLElement(node) && isScrollParent(node)) {
+      return node;
+    }
+
+    return getScrollParent(getParentNode(node));
+  }
+
+  /*
+  given a DOM element, return the list of all scroll parents, up the list of ancesors
+  until we get to the top window object. This list is what we attach scroll listeners
+  to, because if any of these parent elements scroll, we'll need to re-calculate the 
+  reference element's position.
+  */
+
+  function listScrollParents(element, list) {
+    if (list === void 0) {
+      list = [];
+    }
+
+    var scrollParent = getScrollParent(element);
+    var isBody = getNodeName(scrollParent) === 'body';
+    var win = getWindow(scrollParent);
+    var target = isBody ? [win].concat(win.visualViewport || [], isScrollParent(scrollParent) ? scrollParent : []) : scrollParent;
+    var updatedList = list.concat(target);
+    return isBody ? updatedList : // $FlowFixMe: isBody tells us target will be an HTMLElement here
+    updatedList.concat(listScrollParents(getParentNode(target)));
+  }
+
+  function isTableElement(element) {
+    return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;
+  }
+
+  function getTrueOffsetParent(element) {
+    if (!isHTMLElement(element) || // https://github.com/popperjs/popper-core/issues/837
+    getComputedStyle(element).position === 'fixed') {
+      return null;
+    }
+
+    var offsetParent = element.offsetParent;
+
+    if (offsetParent) {
+      var html = getDocumentElement(offsetParent);
+
+      if (getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static' && getComputedStyle(html).position !== 'static') {
+        return html;
+      }
+    }
+
+    return offsetParent;
+  } // `.offsetParent` reports `null` for fixed elements, while absolute elements
+  // return the containing block
+
+
+  function getContainingBlock(element) {
+    var currentNode = getParentNode(element);
+
+    while (isHTMLElement(currentNode) && ['html', 'body'].indexOf(getNodeName(currentNode)) < 0) {
+      var css = getComputedStyle(currentNode); // This is non-exhaustive but covers the most common CSS properties that
+      // create a containing block.
+
+      if (css.transform !== 'none' || css.perspective !== 'none' || css.willChange && css.willChange !== 'auto') {
+        return currentNode;
+      } else {
+        currentNode = currentNode.parentNode;
+      }
+    }
+
+    return null;
+  } // Gets the closest ancestor positioned element. Handles some edge cases,
+  // such as table ancestors and cross browser bugs.
+
+
+  function getOffsetParent(element) {
+    var window = getWindow(element);
+    var offsetParent = getTrueOffsetParent(element);
+
+    while (offsetParent && isTableElement(offsetParent) && getComputedStyle(offsetParent).position === 'static') {
+      offsetParent = getTrueOffsetParent(offsetParent);
+    }
+
+    if (offsetParent && getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static') {
+      return window;
+    }
+
+    return offsetParent || getContainingBlock(element) || window;
+  }
+
+  var top = 'top';
+  var bottom = 'bottom';
+  var right = 'right';
+  var left = 'left';
+  var auto = 'auto';
+  var basePlacements = [top, bottom, right, left];
+  var start = 'start';
+  var end = 'end';
+  var clippingParents = 'clippingParents';
+  var viewport = 'viewport';
+  var popper = 'popper';
+  var reference = 'reference';
+
+  var beforeRead = 'beforeRead';
+  var read = 'read';
+  var afterRead = 'afterRead'; // pure-logic modifiers
+
+  var beforeMain = 'beforeMain';
+  var main = 'main';
+  var afterMain = 'afterMain'; // modifier with the purpose to write to the DOM (or write into a framework state)
+
+  var beforeWrite = 'beforeWrite';
+  var write = 'write';
+  var afterWrite = 'afterWrite';
+  var modifierPhases = [beforeRead, read, afterRead, beforeMain, main, afterMain, beforeWrite, write, afterWrite];
+
+  function order(modifiers) {
+    var map = new Map();
+    var visited = new Set();
+    var result = [];
+    modifiers.forEach(function (modifier) {
+      map.set(modifier.name, modifier);
+    }); // On visiting object, check for its dependencies and visit them recursively
+
+    function sort(modifier) {
+      visited.add(modifier.name);
+      var requires = [].concat(modifier.requires || [], modifier.requiresIfExists || []);
+      requires.forEach(function (dep) {
+        if (!visited.has(dep)) {
+          var depModifier = map.get(dep);
+
+          if (depModifier) {
+            sort(depModifier);
+          }
+        }
+      });
+      result.push(modifier);
+    }
+
+    modifiers.forEach(function (modifier) {
+      if (!visited.has(modifier.name)) {
+        // check for visited object
+        sort(modifier);
+      }
+    });
+    return result;
+  }
+
+  function orderModifiers(modifiers) {
+    // order based on dependencies
+    var orderedModifiers = order(modifiers); // order based on phase
+
+    return modifierPhases.reduce(function (acc, phase) {
+      return acc.concat(orderedModifiers.filter(function (modifier) {
+        return modifier.phase === phase;
+      }));
+    }, []);
+  }
+
+  function debounce(fn) {
+    var pending;
+    return function () {
+      if (!pending) {
+        pending = new Promise(function (resolve) {
+          Promise.resolve().then(function () {
+            pending = undefined;
+            resolve(fn());
+          });
+        });
+      }
+
+      return pending;
+    };
+  }
+
+  function format(str) {
+    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      args[_key - 1] = arguments[_key];
+    }
+
+    return [].concat(args).reduce(function (p, c) {
+      return p.replace(/%s/, c);
+    }, str);
+  }
+
+  var INVALID_MODIFIER_ERROR = 'Popper: modifier "%s" provided an invalid %s property, expected %s but got %s';
+  var MISSING_DEPENDENCY_ERROR = 'Popper: modifier "%s" requires "%s", but "%s" modifier is not available';
+  var VALID_PROPERTIES = ['name', 'enabled', 'phase', 'fn', 'effect', 'requires', 'options'];
+  function validateModifiers(modifiers) {
+    modifiers.forEach(function (modifier) {
+      Object.keys(modifier).forEach(function (key) {
+        switch (key) {
+          case 'name':
+            if (typeof modifier.name !== 'string') {
+              console.error(format(INVALID_MODIFIER_ERROR, String(modifier.name), '"name"', '"string"', "\"" + String(modifier.name) + "\""));
+            }
+
+            break;
+
+          case 'enabled':
+            if (typeof modifier.enabled !== 'boolean') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"enabled"', '"boolean"', "\"" + String(modifier.enabled) + "\""));
+            }
+
+          case 'phase':
+            if (modifierPhases.indexOf(modifier.phase) < 0) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"phase"', "either " + modifierPhases.join(', '), "\"" + String(modifier.phase) + "\""));
+            }
+
+            break;
+
+          case 'fn':
+            if (typeof modifier.fn !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"fn"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'effect':
+            if (typeof modifier.effect !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"effect"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'requires':
+            if (!Array.isArray(modifier.requires)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requires"', '"array"', "\"" + String(modifier.requires) + "\""));
+            }
+
+            break;
+
+          case 'requiresIfExists':
+            if (!Array.isArray(modifier.requiresIfExists)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requiresIfExists"', '"array"', "\"" + String(modifier.requiresIfExists) + "\""));
+            }
+
+            break;
+
+          case 'options':
+          case 'data':
+            break;
+
+          default:
+            console.error("PopperJS: an invalid property has been provided to the \"" + modifier.name + "\" modifier, valid properties are " + VALID_PROPERTIES.map(function (s) {
+              return "\"" + s + "\"";
+            }).join(', ') + "; but \"" + key + "\" was provided.");
+        }
+
+        modifier.requires && modifier.requires.forEach(function (requirement) {
+          if (modifiers.find(function (mod) {
+            return mod.name === requirement;
+          }) == null) {
+            console.error(format(MISSING_DEPENDENCY_ERROR, String(modifier.name), requirement, requirement));
+          }
+        });
+      });
+    });
+  }
+
+  function uniqueBy(arr, fn) {
+    var identifiers = new Set();
+    return arr.filter(function (item) {
+      var identifier = fn(item);
+
+      if (!identifiers.has(identifier)) {
+        identifiers.add(identifier);
+        return true;
+      }
+    });
+  }
+
+  function getBasePlacement(placement) {
+    return placement.split('-')[0];
+  }
+
+  function mergeByName(modifiers) {
+    var merged = modifiers.reduce(function (merged, current) {
+      var existing = merged[current.name];
+      merged[current.name] = existing ? Object.assign(Object.assign(Object.assign({}, existing), current), {}, {
+        options: Object.assign(Object.assign({}, existing.options), current.options),
+        data: Object.assign(Object.assign({}, existing.data), current.data)
+      }) : current;
+      return merged;
+    }, {}); // IE11 does not support Object.values
+
+    return Object.keys(merged).map(function (key) {
+      return merged[key];
+    });
+  }
+
+  function getViewportRect(element) {
+    var win = getWindow(element);
+    var html = getDocumentElement(element);
+    var visualViewport = win.visualViewport;
+    var width = html.clientWidth;
+    var height = html.clientHeight;
+    var x = 0;
+    var y = 0; // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper
+    // can be obscured underneath it.
+    // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even
+    // if it isn't open, so if this isn't available, the popper will be detected
+    // to overflow the bottom of the screen too early.
+
+    if (visualViewport) {
+      width = visualViewport.width;
+      height = visualViewport.height; // Uses Layout Viewport (like Chrome; Safari does not currently)
+      // In Chrome, it returns a value very close to 0 (+/-) but contains rounding
+      // errors due to floating point numbers, so we need to check precision.
+      // Safari returns a number <= 0, usually < -1 when pinch-zoomed
+      // Feature detection fails in mobile emulation mode in Chrome.
+      // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <
+      // 0.001
+      // Fallback here: "Not Safari" userAgent
+
+      if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
+        x = visualViewport.offsetLeft;
+        y = visualViewport.offsetTop;
+      }
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x + getWindowScrollBarX(element),
+      y: y
+    };
+  }
+
+  // of the `<html>` and `<body>` rect bounds if horizontally scrollable
+
+  function getDocumentRect(element) {
+    var html = getDocumentElement(element);
+    var winScroll = getWindowScroll(element);
+    var body = element.ownerDocument.body;
+    var width = Math.max(html.scrollWidth, html.clientWidth, body ? body.scrollWidth : 0, body ? body.clientWidth : 0);
+    var height = Math.max(html.scrollHeight, html.clientHeight, body ? body.scrollHeight : 0, body ? body.clientHeight : 0);
+    var x = -winScroll.scrollLeft + getWindowScrollBarX(element);
+    var y = -winScroll.scrollTop;
+
+    if (getComputedStyle(body || html).direction === 'rtl') {
+      x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x,
+      y: y
+    };
+  }
+
+  function contains(parent, child) {
+    var rootNode = child.getRootNode && child.getRootNode(); // First, attempt with faster native method
+
+    if (parent.contains(child)) {
+      return true;
+    } // then fallback to custom implementation with Shadow DOM support
+    else if (rootNode && isShadowRoot(rootNode)) {
+        var next = child;
+
+        do {
+          if (next && parent.isSameNode(next)) {
+            return true;
+          } // $FlowFixMe: need a better way to handle this...
+
+
+          next = next.parentNode || next.host;
+        } while (next);
+      } // Give up, the result is false
+
+
+    return false;
+  }
+
+  function rectToClientRect(rect) {
+    return Object.assign(Object.assign({}, rect), {}, {
+      left: rect.x,
+      top: rect.y,
+      right: rect.x + rect.width,
+      bottom: rect.y + rect.height
+    });
+  }
+
+  function getInnerBoundingClientRect(element) {
+    var rect = getBoundingClientRect(element);
+    rect.top = rect.top + element.clientTop;
+    rect.left = rect.left + element.clientLeft;
+    rect.bottom = rect.top + element.clientHeight;
+    rect.right = rect.left + element.clientWidth;
+    rect.width = element.clientWidth;
+    rect.height = element.clientHeight;
+    rect.x = rect.left;
+    rect.y = rect.top;
+    return rect;
+  }
+
+  function getClientRectFromMixedType(element, clippingParent) {
+    return clippingParent === viewport ? rectToClientRect(getViewportRect(element)) : isHTMLElement(clippingParent) ? getInnerBoundingClientRect(clippingParent) : rectToClientRect(getDocumentRect(getDocumentElement(element)));
+  } // A "clipping parent" is an overflowable container with the characteristic of
+  // clipping (or hiding) overflowing elements with a position different from
+  // `initial`
+
+
+  function getClippingParents(element) {
+    var clippingParents = listScrollParents(getParentNode(element));
+    var canEscapeClipping = ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;
+    var clipperElement = canEscapeClipping && isHTMLElement(element) ? getOffsetParent(element) : element;
+
+    if (!isElement(clipperElement)) {
+      return [];
+    } // $FlowFixMe: https://github.com/facebook/flow/issues/1414
+
+
+    return clippingParents.filter(function (clippingParent) {
+      return isElement(clippingParent) && contains(clippingParent, clipperElement) && getNodeName(clippingParent) !== 'body';
+    });
+  } // Gets the maximum area that the element is visible in due to any number of
+  // clipping parents
+
+
+  function getClippingRect(element, boundary, rootBoundary) {
+    var mainClippingParents = boundary === 'clippingParents' ? getClippingParents(element) : [].concat(boundary);
+    var clippingParents = [].concat(mainClippingParents, [rootBoundary]);
+    var firstClippingParent = clippingParents[0];
+    var clippingRect = clippingParents.reduce(function (accRect, clippingParent) {
+      var rect = getClientRectFromMixedType(element, clippingParent);
+      accRect.top = Math.max(rect.top, accRect.top);
+      accRect.right = Math.min(rect.right, accRect.right);
+      accRect.bottom = Math.min(rect.bottom, accRect.bottom);
+      accRect.left = Math.max(rect.left, accRect.left);
+      return accRect;
+    }, getClientRectFromMixedType(element, firstClippingParent));
+    clippingRect.width = clippingRect.right - clippingRect.left;
+    clippingRect.height = clippingRect.bottom - clippingRect.top;
+    clippingRect.x = clippingRect.left;
+    clippingRect.y = clippingRect.top;
+    return clippingRect;
+  }
+
+  function getVariation(placement) {
+    return placement.split('-')[1];
+  }
+
+  function getMainAxisFromPlacement(placement) {
+    return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';
+  }
+
+  function computeOffsets(_ref) {
+    var reference = _ref.reference,
+        element = _ref.element,
+        placement = _ref.placement;
+    var basePlacement = placement ? getBasePlacement(placement) : null;
+    var variation = placement ? getVariation(placement) : null;
+    var commonX = reference.x + reference.width / 2 - element.width / 2;
+    var commonY = reference.y + reference.height / 2 - element.height / 2;
+    var offsets;
+
+    switch (basePlacement) {
+      case top:
+        offsets = {
+          x: commonX,
+          y: reference.y - element.height
+        };
+        break;
+
+      case bottom:
+        offsets = {
+          x: commonX,
+          y: reference.y + reference.height
+        };
+        break;
+
+      case right:
+        offsets = {
+          x: reference.x + reference.width,
+          y: commonY
+        };
+        break;
+
+      case left:
+        offsets = {
+          x: reference.x - element.width,
+          y: commonY
+        };
+        break;
+
+      default:
+        offsets = {
+          x: reference.x,
+          y: reference.y
+        };
+    }
+
+    var mainAxis = basePlacement ? getMainAxisFromPlacement(basePlacement) : null;
+
+    if (mainAxis != null) {
+      var len = mainAxis === 'y' ? 'height' : 'width';
+
+      switch (variation) {
+        case start:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) - Math.floor(reference[len] / 2 - element[len] / 2);
+          break;
+
+        case end:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) + Math.ceil(reference[len] / 2 - element[len] / 2);
+          break;
+      }
+    }
+
+    return offsets;
+  }
+
+  function getFreshSideObject() {
+    return {
+      top: 0,
+      right: 0,
+      bottom: 0,
+      left: 0
+    };
+  }
+
+  function mergePaddingObject(paddingObject) {
+    return Object.assign(Object.assign({}, getFreshSideObject()), paddingObject);
+  }
+
+  function expandToHashMap(value, keys) {
+    return keys.reduce(function (hashMap, key) {
+      hashMap[key] = value;
+      return hashMap;
+    }, {});
+  }
+
+  function detectOverflow(state, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    var _options = options,
+        _options$placement = _options.placement,
+        placement = _options$placement === void 0 ? state.placement : _options$placement,
+        _options$boundary = _options.boundary,
+        boundary = _options$boundary === void 0 ? clippingParents : _options$boundary,
+        _options$rootBoundary = _options.rootBoundary,
+        rootBoundary = _options$rootBoundary === void 0 ? viewport : _options$rootBoundary,
+        _options$elementConte = _options.elementContext,
+        elementContext = _options$elementConte === void 0 ? popper : _options$elementConte,
+        _options$altBoundary = _options.altBoundary,
+        altBoundary = _options$altBoundary === void 0 ? false : _options$altBoundary,
+        _options$padding = _options.padding,
+        padding = _options$padding === void 0 ? 0 : _options$padding;
+    var paddingObject = mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
+    var altContext = elementContext === popper ? reference : popper;
+    var referenceElement = state.elements.reference;
+    var popperRect = state.rects.popper;
+    var element = state.elements[altBoundary ? altContext : elementContext];
+    var clippingClientRect = getClippingRect(isElement(element) ? element : element.contextElement || getDocumentElement(state.elements.popper), boundary, rootBoundary);
+    var referenceClientRect = getBoundingClientRect(referenceElement);
+    var popperOffsets = computeOffsets({
+      reference: referenceClientRect,
+      element: popperRect,
+      strategy: 'absolute',
+      placement: placement
+    });
+    var popperClientRect = rectToClientRect(Object.assign(Object.assign({}, popperRect), popperOffsets));
+    var elementClientRect = elementContext === popper ? popperClientRect : referenceClientRect; // positive = overflowing the clipping rect
+    // 0 or negative = within the clipping rect
+
+    var overflowOffsets = {
+      top: clippingClientRect.top - elementClientRect.top + paddingObject.top,
+      bottom: elementClientRect.bottom - clippingClientRect.bottom + paddingObject.bottom,
+      left: clippingClientRect.left - elementClientRect.left + paddingObject.left,
+      right: elementClientRect.right - clippingClientRect.right + paddingObject.right
+    };
+    var offsetData = state.modifiersData.offset; // Offsets can be applied only to the popper element
+
+    if (elementContext === popper && offsetData) {
+      var offset = offsetData[placement];
+      Object.keys(overflowOffsets).forEach(function (key) {
+        var multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;
+        var axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';
+        overflowOffsets[key] += offset[axis] * multiply;
+      });
+    }
+
+    return overflowOffsets;
+  }
+
+  var INVALID_ELEMENT_ERROR = 'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';
+  var INFINITE_LOOP_ERROR = 'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';
+  var DEFAULT_OPTIONS = {
+    placement: 'bottom',
+    modifiers: [],
+    strategy: 'absolute'
+  };
+
+  function areValidElements() {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    return !args.some(function (element) {
+      return !(element && typeof element.getBoundingClientRect === 'function');
+    });
+  }
+
+  function popperGenerator(generatorOptions) {
+    if (generatorOptions === void 0) {
+      generatorOptions = {};
+    }
+
+    var _generatorOptions = generatorOptions,
+        _generatorOptions$def = _generatorOptions.defaultModifiers,
+        defaultModifiers = _generatorOptions$def === void 0 ? [] : _generatorOptions$def,
+        _generatorOptions$def2 = _generatorOptions.defaultOptions,
+        defaultOptions = _generatorOptions$def2 === void 0 ? DEFAULT_OPTIONS : _generatorOptions$def2;
+    return function createPopper(reference, popper, options) {
+      if (options === void 0) {
+        options = defaultOptions;
+      }
+
+      var state = {
+        placement: 'bottom',
+        orderedModifiers: [],
+        options: Object.assign(Object.assign({}, DEFAULT_OPTIONS), defaultOptions),
+        modifiersData: {},
+        elements: {
+          reference: reference,
+          popper: popper
+        },
+        attributes: {},
+        styles: {}
+      };
+      var effectCleanupFns = [];
+      var isDestroyed = false;
+      var instance = {
+        state: state,
+        setOptions: function setOptions(options) {
+          cleanupModifierEffects();
+          state.options = Object.assign(Object.assign(Object.assign({}, defaultOptions), state.options), options);
+          state.scrollParents = {
+            reference: isElement(reference) ? listScrollParents(reference) : reference.contextElement ? listScrollParents(reference.contextElement) : [],
+            popper: listScrollParents(popper)
+          }; // Orders the modifiers based on their dependencies and `phase`
+          // properties
+
+          var orderedModifiers = orderModifiers(mergeByName([].concat(defaultModifiers, state.options.modifiers))); // Strip out disabled modifiers
+
+          state.orderedModifiers = orderedModifiers.filter(function (m) {
+            return m.enabled;
+          }); // Validate the provided modifiers so that the consumer will get warned
+          // if one of the modifiers is invalid for any reason
+
+          {
+            var modifiers = uniqueBy([].concat(orderedModifiers, state.options.modifiers), function (_ref) {
+              var name = _ref.name;
+              return name;
+            });
+            validateModifiers(modifiers);
+
+            if (getBasePlacement(state.options.placement) === auto) {
+              var flipModifier = state.orderedModifiers.find(function (_ref2) {
+                var name = _ref2.name;
+                return name === 'flip';
+              });
+
+              if (!flipModifier) {
+                console.error(['Popper: "auto" placements require the "flip" modifier be', 'present and enabled to work.'].join(' '));
+              }
+            }
+
+            var _getComputedStyle = getComputedStyle(popper),
+                marginTop = _getComputedStyle.marginTop,
+                marginRight = _getComputedStyle.marginRight,
+                marginBottom = _getComputedStyle.marginBottom,
+                marginLeft = _getComputedStyle.marginLeft; // We no longer take into account `margins` on the popper, and it can
+            // cause bugs with positioning, so we'll warn the consumer
+
+
+            if ([marginTop, marginRight, marginBottom, marginLeft].some(function (margin) {
+              return parseFloat(margin);
+            })) {
+              console.warn(['Popper: CSS "margin" styles cannot be used to apply padding', 'between the popper and its reference element or boundary.', 'To replicate margin, use the `offset` modifier, as well as', 'the `padding` option in the `preventOverflow` and `flip`', 'modifiers.'].join(' '));
+            }
+          }
+
+          runModifierEffects();
+          return instance.update();
+        },
+        // Sync update – it will always be executed, even if not necessary. This
+        // is useful for low frequency updates where sync behavior simplifies the
+        // logic.
+        // For high frequency updates (e.g. `resize` and `scroll` events), always
+        // prefer the async Popper#update method
+        forceUpdate: function forceUpdate() {
+          if (isDestroyed) {
+            return;
+          }
+
+          var _state$elements = state.elements,
+              reference = _state$elements.reference,
+              popper = _state$elements.popper; // Don't proceed if `reference` or `popper` are not valid elements
+          // anymore
+
+          if (!areValidElements(reference, popper)) {
+            {
+              console.error(INVALID_ELEMENT_ERROR);
+            }
+
+            return;
+          } // Store the reference and popper rects to be read by modifiers
+
+
+          state.rects = {
+            reference: getCompositeRect(reference, getOffsetParent(popper), state.options.strategy === 'fixed'),
+            popper: getLayoutRect(popper)
+          }; // Modifiers have the ability to reset the current update cycle. The
+          // most common use case for this is the `flip` modifier changing the
+          // placement, which then needs to re-run all the modifiers, because the
+          // logic was previously ran for the previous placement and is therefore
+          // stale/incorrect
+
+          state.reset = false;
+          state.placement = state.options.placement; // On each update cycle, the `modifiersData` property for each modifier
+          // is filled with the initial data specified by the modifier. This means
+          // it doesn't persist and is fresh on each update.
+          // To ensure persistent data, use `${name}#persistent`
+
+          state.orderedModifiers.forEach(function (modifier) {
+            return state.modifiersData[modifier.name] = Object.assign({}, modifier.data);
+          });
+          var __debug_loops__ = 0;
+
+          for (var index = 0; index < state.orderedModifiers.length; index++) {
+            {
+              __debug_loops__ += 1;
+
+              if (__debug_loops__ > 100) {
+                console.error(INFINITE_LOOP_ERROR);
+                break;
+              }
+            }
+
+            if (state.reset === true) {
+              state.reset = false;
+              index = -1;
+              continue;
+            }
+
+            var _state$orderedModifie = state.orderedModifiers[index],
+                fn = _state$orderedModifie.fn,
+                _state$orderedModifie2 = _state$orderedModifie.options,
+                _options = _state$orderedModifie2 === void 0 ? {} : _state$orderedModifie2,
+                name = _state$orderedModifie.name;
+
+            if (typeof fn === 'function') {
+              state = fn({
+                state: state,
+                options: _options,
+                name: name,
+                instance: instance
+              }) || state;
+            }
+          }
+        },
+        // Async and optimistically optimized update – it will not be executed if
+        // not necessary (debounced to run at most once-per-tick)
+        update: debounce(function () {
+          return new Promise(function (resolve) {
+            instance.forceUpdate();
+            resolve(state);
+          });
+        }),
+        destroy: function destroy() {
+          cleanupModifierEffects();
+          isDestroyed = true;
+        }
+      };
+
+      if (!areValidElements(reference, popper)) {
+        {
+          console.error(INVALID_ELEMENT_ERROR);
+        }
+
+        return instance;
+      }
+
+      instance.setOptions(options).then(function (state) {
+        if (!isDestroyed && options.onFirstUpdate) {
+          options.onFirstUpdate(state);
+        }
+      }); // Modifiers have the ability to execute arbitrary code before the first
+      // update cycle runs. They will be executed in the same order as the update
+      // cycle. This is useful when a modifier adds some persistent data that
+      // other modifiers need to use, but the modifier is run after the dependent
+      // one.
+
+      function runModifierEffects() {
+        state.orderedModifiers.forEach(function (_ref3) {
+          var name = _ref3.name,
+              _ref3$options = _ref3.options,
+              options = _ref3$options === void 0 ? {} : _ref3$options,
+              effect = _ref3.effect;
+
+          if (typeof effect === 'function') {
+            var cleanupFn = effect({
+              state: state,
+              name: name,
+              instance: instance,
+              options: options
+            });
+
+            var noopFn = function noopFn() {};
+
+            effectCleanupFns.push(cleanupFn || noopFn);
+          }
+        });
+      }
+
+      function cleanupModifierEffects() {
+        effectCleanupFns.forEach(function (fn) {
+          return fn();
+        });
+        effectCleanupFns = [];
+      }
+
+      return instance;
+    };
+  }
+
+  var passive = {
+    passive: true
+  };
+
+  function effect(_ref) {
+    var state = _ref.state,
+        instance = _ref.instance,
+        options = _ref.options;
+    var _options$scroll = options.scroll,
+        scroll = _options$scroll === void 0 ? true : _options$scroll,
+        _options$resize = options.resize,
+        resize = _options$resize === void 0 ? true : _options$resize;
+    var window = getWindow(state.elements.popper);
+    var scrollParents = [].concat(state.scrollParents.reference, state.scrollParents.popper);
+
+    if (scroll) {
+      scrollParents.forEach(function (scrollParent) {
+        scrollParent.addEventListener('scroll', instance.update, passive);
+      });
+    }
+
+    if (resize) {
+      window.addEventListener('resize', instance.update, passive);
+    }
+
+    return function () {
+      if (scroll) {
+        scrollParents.forEach(function (scrollParent) {
+          scrollParent.removeEventListener('scroll', instance.update, passive);
+        });
+      }
+
+      if (resize) {
+        window.removeEventListener('resize', instance.update, passive);
+      }
+    };
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var eventListeners = {
+    name: 'eventListeners',
+    enabled: true,
+    phase: 'write',
+    fn: function fn() {},
+    effect: effect,
+    data: {}
+  };
+
+  function popperOffsets(_ref) {
+    var state = _ref.state,
+        name = _ref.name;
+    // Offsets are the actual position the popper needs to have to be
+    // properly positioned near its reference element
+    // This is the most basic placement, and will be adjusted by
+    // the modifiers in the next step
+    state.modifiersData[name] = computeOffsets({
+      reference: state.rects.reference,
+      element: state.rects.popper,
+      strategy: 'absolute',
+      placement: state.placement
+    });
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var popperOffsets$1 = {
+    name: 'popperOffsets',
+    enabled: true,
+    phase: 'read',
+    fn: popperOffsets,
+    data: {}
+  };
+
+  var unsetSides = {
+    top: 'auto',
+    right: 'auto',
+    bottom: 'auto',
+    left: 'auto'
+  }; // Round the offsets to the nearest suitable subpixel based on the DPR.
+  // Zooming can change the DPR, but it seems to report a value that will
+  // cleanly divide the values into the appropriate subpixels.
+
+  function roundOffsets(_ref) {
+    var x = _ref.x,
+        y = _ref.y;
+    var win = window;
+    var dpr = win.devicePixelRatio || 1;
+    return {
+      x: Math.round(x * dpr) / dpr || 0,
+      y: Math.round(y * dpr) / dpr || 0
+    };
+  }
+
+  function mapToStyles(_ref2) {
+    var _Object$assign2;
+
+    var popper = _ref2.popper,
+        popperRect = _ref2.popperRect,
+        placement = _ref2.placement,
+        offsets = _ref2.offsets,
+        position = _ref2.position,
+        gpuAcceleration = _ref2.gpuAcceleration,
+        adaptive = _ref2.adaptive;
+
+    var _roundOffsets = roundOffsets(offsets),
+        x = _roundOffsets.x,
+        y = _roundOffsets.y;
+
+    var hasX = offsets.hasOwnProperty('x');
+    var hasY = offsets.hasOwnProperty('y');
+    var sideX = left;
+    var sideY = top;
+    var win = window;
+
+    if (adaptive) {
+      var offsetParent = getOffsetParent(popper);
+
+      if (offsetParent === getWindow(popper)) {
+        offsetParent = getDocumentElement(popper);
+      } // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it
+
+      /*:: offsetParent = (offsetParent: Element); */
+
+
+      if (placement === top) {
+        sideY = bottom;
+        y -= offsetParent.clientHeight - popperRect.height;
+        y *= gpuAcceleration ? 1 : -1;
+      }
+
+      if (placement === left) {
+        sideX = right;
+        x -= offsetParent.clientWidth - popperRect.width;
+        x *= gpuAcceleration ? 1 : -1;
+      }
+    }
+
+    var commonStyles = Object.assign({
+      position: position
+    }, adaptive && unsetSides);
+
+    if (gpuAcceleration) {
+      var _Object$assign;
+
+      return Object.assign(Object.assign({}, commonStyles), {}, (_Object$assign = {}, _Object$assign[sideY] = hasY ? '0' : '', _Object$assign[sideX] = hasX ? '0' : '', _Object$assign.transform = (win.devicePixelRatio || 1) < 2 ? "translate(" + x + "px, " + y + "px)" : "translate3d(" + x + "px, " + y + "px, 0)", _Object$assign));
+    }
+
+    return Object.assign(Object.assign({}, commonStyles), {}, (_Object$assign2 = {}, _Object$assign2[sideY] = hasY ? y + "px" : '', _Object$assign2[sideX] = hasX ? x + "px" : '', _Object$assign2.transform = '', _Object$assign2));
+  }
+
+  function computeStyles(_ref3) {
+    var state = _ref3.state,
+        options = _ref3.options;
+    var _options$gpuAccelerat = options.gpuAcceleration,
+        gpuAcceleration = _options$gpuAccelerat === void 0 ? true : _options$gpuAccelerat,
+        _options$adaptive = options.adaptive,
+        adaptive = _options$adaptive === void 0 ? true : _options$adaptive;
+
+    {
+      var transitionProperty = getComputedStyle(state.elements.popper).transitionProperty || '';
+
+      if (adaptive && ['transform', 'top', 'right', 'bottom', 'left'].some(function (property) {
+        return transitionProperty.indexOf(property) >= 0;
+      })) {
+        console.warn(['Popper: Detected CSS transitions on at least one of the following', 'CSS properties: "transform", "top", "right", "bottom", "left".', '\n\n', 'Disable the "computeStyles" modifier\'s `adaptive` option to allow', 'for smooth transitions, or remove these properties from the CSS', 'transition declaration on the popper element if only transitioning', 'opacity or background-color for example.', '\n\n', 'We recommend using the popper element as a wrapper around an inner', 'element that can have any CSS property transitioned for animations.'].join(' '));
+      }
+    }
+
+    var commonStyles = {
+      placement: getBasePlacement(state.placement),
+      popper: state.elements.popper,
+      popperRect: state.rects.popper,
+      gpuAcceleration: gpuAcceleration
+    };
+
+    if (state.modifiersData.popperOffsets != null) {
+      state.styles.popper = Object.assign(Object.assign({}, state.styles.popper), mapToStyles(Object.assign(Object.assign({}, commonStyles), {}, {
+        offsets: state.modifiersData.popperOffsets,
+        position: state.options.strategy,
+        adaptive: adaptive
+      })));
+    }
+
+    if (state.modifiersData.arrow != null) {
+      state.styles.arrow = Object.assign(Object.assign({}, state.styles.arrow), mapToStyles(Object.assign(Object.assign({}, commonStyles), {}, {
+        offsets: state.modifiersData.arrow,
+        position: 'absolute',
+        adaptive: false
+      })));
+    }
+
+    state.attributes.popper = Object.assign(Object.assign({}, state.attributes.popper), {}, {
+      'data-popper-placement': state.placement
+    });
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var computeStyles$1 = {
+    name: 'computeStyles',
+    enabled: true,
+    phase: 'beforeWrite',
+    fn: computeStyles,
+    data: {}
+  };
+
+  // and applies them to the HTMLElements such as popper and arrow
+
+  function applyStyles(_ref) {
+    var state = _ref.state;
+    Object.keys(state.elements).forEach(function (name) {
+      var style = state.styles[name] || {};
+      var attributes = state.attributes[name] || {};
+      var element = state.elements[name]; // arrow is optional + virtual elements
+
+      if (!isHTMLElement(element) || !getNodeName(element)) {
+        return;
+      } // Flow doesn't support to extend this property, but it's the most
+      // effective way to apply styles to an HTMLElement
+      // $FlowFixMe
+
+
+      Object.assign(element.style, style);
+      Object.keys(attributes).forEach(function (name) {
+        var value = attributes[name];
+
+        if (value === false) {
+          element.removeAttribute(name);
+        } else {
+          element.setAttribute(name, value === true ? '' : value);
+        }
+      });
+    });
+  }
+
+  function effect$1(_ref2) {
+    var state = _ref2.state;
+    var initialStyles = {
+      popper: {
+        position: state.options.strategy,
+        left: '0',
+        top: '0',
+        margin: '0'
+      },
+      arrow: {
+        position: 'absolute'
+      },
+      reference: {}
+    };
+    Object.assign(state.elements.popper.style, initialStyles.popper);
+
+    if (state.elements.arrow) {
+      Object.assign(state.elements.arrow.style, initialStyles.arrow);
+    }
+
+    return function () {
+      Object.keys(state.elements).forEach(function (name) {
+        var element = state.elements[name];
+        var attributes = state.attributes[name] || {};
+        var styleProperties = Object.keys(state.styles.hasOwnProperty(name) ? state.styles[name] : initialStyles[name]); // Set all values to an empty string to unset them
+
+        var style = styleProperties.reduce(function (style, property) {
+          style[property] = '';
+          return style;
+        }, {}); // arrow is optional + virtual elements
+
+        if (!isHTMLElement(element) || !getNodeName(element)) {
+          return;
+        } // Flow doesn't support to extend this property, but it's the most
+        // effective way to apply styles to an HTMLElement
+        // $FlowFixMe
+
+
+        Object.assign(element.style, style);
+        Object.keys(attributes).forEach(function (attribute) {
+          element.removeAttribute(attribute);
+        });
+      });
+    };
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var applyStyles$1 = {
+    name: 'applyStyles',
+    enabled: true,
+    phase: 'write',
+    fn: applyStyles,
+    effect: effect$1,
+    requires: ['computeStyles']
+  };
+
+  var defaultModifiers = [eventListeners, popperOffsets$1, computeStyles$1, applyStyles$1];
+  var createPopper = /*#__PURE__*/popperGenerator({
+    defaultModifiers: defaultModifiers
+  }); // eslint-disable-next-line import/no-unused-modules
+
+  exports.createPopper = createPopper;
+  exports.defaultModifiers = defaultModifiers;
+  exports.detectOverflow = detectOverflow;
+  exports.popperGenerator = popperGenerator;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=popper-lite.js.map
diff --git a/web-tools/web/_static/popperjs/popper-lite.js.map b/web-tools/web/_static/popperjs/popper-lite.js.map
new file mode 100644
index 0000000..0c09fd1
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-lite.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper-lite.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getLayoutRect.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/isTableElement.js","../../src/dom-utils/getOffsetParent.js","../../src/enums.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/format.js","../../src/utils/validateModifiers.js","../../src/utils/uniqueBy.js","../../src/utils/getBasePlacement.js","../../src/utils/mergeByName.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/dom-utils/contains.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/utils/getVariation.js","../../src/utils/getMainAxisFromPlacement.js","../../src/utils/computeOffsets.js","../../src/utils/getFreshSideObject.js","../../src/utils/mergePaddingObject.js","../../src/utils/expandToHashMap.js","../../src/utils/detectOverflow.js","../../src/createPopper.js","../../src/modifiers/eventListeners.js","../../src/modifiers/popperOffsets.js","../../src/modifiers/computeStyles.js","../../src/modifiers/applyStyles.js","../../src/popper-lite.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\n\nexport default function format(str: string, ...args: Array<string>) {\n  return [...args].reduce((p, c) => p.replace(/%s/, c), str);\n}\n","// @flow\nimport format from './format';\nimport { modifierPhases } from '../enums';\n\nconst INVALID_MODIFIER_ERROR =\n  'Popper: modifier \"%s\" provided an invalid %s property, expected %s but got %s';\nconst MISSING_DEPENDENCY_ERROR =\n  'Popper: modifier \"%s\" requires \"%s\", but \"%s\" modifier is not available';\nconst VALID_PROPERTIES = [\n  'name',\n  'enabled',\n  'phase',\n  'fn',\n  'effect',\n  'requires',\n  'options',\n];\n\nexport default function validateModifiers(modifiers: Array<any>): void {\n  modifiers.forEach(modifier => {\n    Object.keys(modifier).forEach(key => {\n      switch (key) {\n        case 'name':\n          if (typeof modifier.name !== 'string') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                String(modifier.name),\n                '\"name\"',\n                '\"string\"',\n                `\"${String(modifier.name)}\"`\n              )\n            );\n          }\n          break;\n        case 'enabled':\n          if (typeof modifier.enabled !== 'boolean') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"enabled\"',\n                '\"boolean\"',\n                `\"${String(modifier.enabled)}\"`\n              )\n            );\n          }\n        case 'phase':\n          if (modifierPhases.indexOf(modifier.phase) < 0) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"phase\"',\n                `either ${modifierPhases.join(', ')}`,\n                `\"${String(modifier.phase)}\"`\n              )\n            );\n          }\n          break;\n        case 'fn':\n          if (typeof modifier.fn !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"fn\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'effect':\n          if (typeof modifier.effect !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"effect\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'requires':\n          if (!Array.isArray(modifier.requires)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requires\"',\n                '\"array\"',\n                `\"${String(modifier.requires)}\"`\n              )\n            );\n          }\n          break;\n        case 'requiresIfExists':\n          if (!Array.isArray(modifier.requiresIfExists)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requiresIfExists\"',\n                '\"array\"',\n                `\"${String(modifier.requiresIfExists)}\"`\n              )\n            );\n          }\n          break;\n        case 'options':\n        case 'data':\n          break;\n        default:\n          console.error(\n            `PopperJS: an invalid property has been provided to the \"${\n              modifier.name\n            }\" modifier, valid properties are ${VALID_PROPERTIES.map(\n              s => `\"${s}\"`\n            ).join(', ')}; but \"${key}\" was provided.`\n          );\n      }\n\n      modifier.requires &&\n        modifier.requires.forEach(requirement => {\n          if (modifiers.find(mod => mod.name === requirement) == null) {\n            console.error(\n              format(\n                MISSING_DEPENDENCY_ERROR,\n                String(modifier.name),\n                requirement,\n                requirement\n              )\n            );\n          }\n        });\n    });\n  });\n}\n","// @flow\n\nexport default function uniqueBy<T>(arr: Array<T>, fn: T => any): Array<T> {\n  const identifiers = new Set();\n\n  return arr.filter(item => {\n    const identifier = fn(item);\n\n    if (!identifiers.has(identifier)) {\n      identifiers.add(identifier);\n      return true;\n    }\n  });\n}\n","// @flow\nimport { type BasePlacement, type Placement, auto } from '../enums';\n\nexport default function getBasePlacement(\n  placement: Placement | typeof auto\n): BasePlacement {\n  return (placement.split('-')[0]: any);\n}\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nimport { type Variation, type Placement } from '../enums';\n\nexport default function getVariation(placement: Placement): ?Variation {\n  return (placement.split('-')[1]: any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nexport default function getMainAxisFromPlacement(\n  placement: Placement\n): 'x' | 'y' {\n  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';\n}\n","// @flow\nimport getBasePlacement from './getBasePlacement';\nimport getVariation from './getVariation';\nimport getMainAxisFromPlacement from './getMainAxisFromPlacement';\nimport type {\n  Rect,\n  PositioningStrategy,\n  Offsets,\n  ClientRectObject,\n} from '../types';\nimport { top, right, bottom, left, start, end, type Placement } from '../enums';\n\nexport default function computeOffsets({\n  reference,\n  element,\n  placement,\n}: {\n  reference: Rect | ClientRectObject,\n  element: Rect | ClientRectObject,\n  strategy: PositioningStrategy,\n  placement?: Placement,\n}): Offsets {\n  const basePlacement = placement ? getBasePlacement(placement) : null;\n  const variation = placement ? getVariation(placement) : null;\n  const commonX = reference.x + reference.width / 2 - element.width / 2;\n  const commonY = reference.y + reference.height / 2 - element.height / 2;\n\n  let offsets;\n  switch (basePlacement) {\n    case top:\n      offsets = {\n        x: commonX,\n        y: reference.y - element.height,\n      };\n      break;\n    case bottom:\n      offsets = {\n        x: commonX,\n        y: reference.y + reference.height,\n      };\n      break;\n    case right:\n      offsets = {\n        x: reference.x + reference.width,\n        y: commonY,\n      };\n      break;\n    case left:\n      offsets = {\n        x: reference.x - element.width,\n        y: commonY,\n      };\n      break;\n    default:\n      offsets = {\n        x: reference.x,\n        y: reference.y,\n      };\n  }\n\n  const mainAxis = basePlacement\n    ? getMainAxisFromPlacement(basePlacement)\n    : null;\n\n  if (mainAxis != null) {\n    const len = mainAxis === 'y' ? 'height' : 'width';\n\n    switch (variation) {\n      case start:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) -\n          Math.floor(reference[len] / 2 - element[len] / 2);\n        break;\n      case end:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) +\n          Math.ceil(reference[len] / 2 - element[len] / 2);\n        break;\n      default:\n    }\n  }\n\n  return offsets;\n}\n","// @flow\nimport type { SideObject } from '../types';\n\nexport default function getFreshSideObject(): SideObject {\n  return {\n    top: 0,\n    right: 0,\n    bottom: 0,\n    left: 0,\n  };\n}\n","// @flow\nimport type { SideObject } from '../types';\nimport getFreshSideObject from './getFreshSideObject';\n\nexport default function mergePaddingObject(\n  paddingObject: $Shape<SideObject>\n): SideObject {\n  return {\n    ...getFreshSideObject(),\n    ...paddingObject,\n  };\n}\n","// @flow\n\nexport default function expandToHashMap<\n  T: number | string | boolean,\n  K: string\n>(value: T, keys: Array<K>): { [key: string]: T } {\n  return keys.reduce((hashMap, key) => {\n    hashMap[key] = value;\n    return hashMap;\n  }, {});\n}\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';\n      overflowOffsets[key] += offset[axis] * multiply;\n    });\n  }\n\n  return overflowOffsets;\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow };\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport getWindow from '../dom-utils/getWindow';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  scroll: boolean,\n  resize: boolean,\n};\n\nconst passive = { passive: true };\n\nfunction effect({ state, instance, options }: ModifierArguments<Options>) {\n  const { scroll = true, resize = true } = options;\n\n  const window = getWindow(state.elements.popper);\n  const scrollParents = [\n    ...state.scrollParents.reference,\n    ...state.scrollParents.popper,\n  ];\n\n  if (scroll) {\n    scrollParents.forEach(scrollParent => {\n      scrollParent.addEventListener('scroll', instance.update, passive);\n    });\n  }\n\n  if (resize) {\n    window.addEventListener('resize', instance.update, passive);\n  }\n\n  return () => {\n    if (scroll) {\n      scrollParents.forEach(scrollParent => {\n        scrollParent.removeEventListener('scroll', instance.update, passive);\n      });\n    }\n\n    if (resize) {\n      window.removeEventListener('resize', instance.update, passive);\n    }\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type EventListenersModifier = Modifier<'eventListeners', Options>;\nexport default ({\n  name: 'eventListeners',\n  enabled: true,\n  phase: 'write',\n  fn: () => {},\n  effect,\n  data: {},\n}: EventListenersModifier);\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport computeOffsets from '../utils/computeOffsets';\n\nfunction popperOffsets({ state, name }: ModifierArguments<{||}>) {\n  // Offsets are the actual position the popper needs to have to be\n  // properly positioned near its reference element\n  // This is the most basic placement, and will be adjusted by\n  // the modifiers in the next step\n  state.modifiersData[name] = computeOffsets({\n    reference: state.rects.reference,\n    element: state.rects.popper,\n    strategy: 'absolute',\n    placement: state.placement,\n  });\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PopperOffsetsModifier = Modifier<'popperOffsets', {||}>;\nexport default ({\n  name: 'popperOffsets',\n  enabled: true,\n  phase: 'read',\n  fn: popperOffsets,\n  data: {},\n}: PopperOffsetsModifier);\n","// @flow\nimport type {\n  PositioningStrategy,\n  Offsets,\n  Modifier,\n  ModifierArguments,\n  Rect,\n  Window,\n} from '../types';\nimport { type BasePlacement, top, left, right, bottom } from '../enums';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getWindow from '../dom-utils/getWindow';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport getComputedStyle from '../dom-utils/getComputedStyle';\nimport getBasePlacement from '../utils/getBasePlacement';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n};\n\nconst unsetSides = {\n  top: 'auto',\n  right: 'auto',\n  bottom: 'auto',\n  left: 'auto',\n};\n\n// Round the offsets to the nearest suitable subpixel based on the DPR.\n// Zooming can change the DPR, but it seems to report a value that will\n// cleanly divide the values into the appropriate subpixels.\nfunction roundOffsets({ x, y }): Offsets {\n  const win: Window = window;\n  const dpr = win.devicePixelRatio || 1;\n\n  return {\n    x: Math.round(x * dpr) / dpr || 0,\n    y: Math.round(y * dpr) / dpr || 0,\n  };\n}\n\nexport function mapToStyles({\n  popper,\n  popperRect,\n  placement,\n  offsets,\n  position,\n  gpuAcceleration,\n  adaptive,\n}: {\n  popper: HTMLElement,\n  popperRect: Rect,\n  placement: BasePlacement,\n  offsets: $Shape<{ x: number, y: number, centerOffset: number }>,\n  position: PositioningStrategy,\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n}) {\n  let { x, y } = roundOffsets(offsets);\n\n  const hasX = offsets.hasOwnProperty('x');\n  const hasY = offsets.hasOwnProperty('y');\n\n  let sideX: string = left;\n  let sideY: string = top;\n\n  const win: Window = window;\n\n  if (adaptive) {\n    let offsetParent = getOffsetParent(popper);\n    if (offsetParent === getWindow(popper)) {\n      offsetParent = getDocumentElement(popper);\n    }\n\n    // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it\n    /*:: offsetParent = (offsetParent: Element); */\n\n    if (placement === top) {\n      sideY = bottom;\n      y -= offsetParent.clientHeight - popperRect.height;\n      y *= gpuAcceleration ? 1 : -1;\n    }\n\n    if (placement === left) {\n      sideX = right;\n      x -= offsetParent.clientWidth - popperRect.width;\n      x *= gpuAcceleration ? 1 : -1;\n    }\n  }\n\n  const commonStyles = {\n    position,\n    ...(adaptive && unsetSides),\n  };\n\n  if (gpuAcceleration) {\n    return {\n      ...commonStyles,\n      [sideY]: hasY ? '0' : '',\n      [sideX]: hasX ? '0' : '',\n      // Layer acceleration can disable subpixel rendering which causes slightly\n      // blurry text on low PPI displays, so we want to use 2D transforms\n      // instead\n      transform:\n        (win.devicePixelRatio || 1) < 2\n          ? `translate(${x}px, ${y}px)`\n          : `translate3d(${x}px, ${y}px, 0)`,\n    };\n  }\n\n  return {\n    ...commonStyles,\n    [sideY]: hasY ? `${y}px` : '',\n    [sideX]: hasX ? `${x}px` : '',\n    transform: '',\n  };\n}\n\nfunction computeStyles({ state, options }: ModifierArguments<Options>) {\n  const { gpuAcceleration = true, adaptive = true } = options;\n\n  if (__DEV__) {\n    const transitionProperty =\n      getComputedStyle(state.elements.popper).transitionProperty || '';\n\n    if (\n      adaptive &&\n      ['transform', 'top', 'right', 'bottom', 'left'].some(\n        property => transitionProperty.indexOf(property) >= 0\n      )\n    ) {\n      console.warn(\n        [\n          'Popper: Detected CSS transitions on at least one of the following',\n          'CSS properties: \"transform\", \"top\", \"right\", \"bottom\", \"left\".',\n          '\\n\\n',\n          'Disable the \"computeStyles\" modifier\\'s `adaptive` option to allow',\n          'for smooth transitions, or remove these properties from the CSS',\n          'transition declaration on the popper element if only transitioning',\n          'opacity or background-color for example.',\n          '\\n\\n',\n          'We recommend using the popper element as a wrapper around an inner',\n          'element that can have any CSS property transitioned for animations.',\n        ].join(' ')\n      );\n    }\n  }\n\n  const commonStyles = {\n    placement: getBasePlacement(state.placement),\n    popper: state.elements.popper,\n    popperRect: state.rects.popper,\n    gpuAcceleration,\n  };\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.styles.popper = {\n      ...state.styles.popper,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.popperOffsets,\n        position: state.options.strategy,\n        adaptive,\n      }),\n    };\n  }\n\n  if (state.modifiersData.arrow != null) {\n    state.styles.arrow = {\n      ...state.styles.arrow,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.arrow,\n        position: 'absolute',\n        adaptive: false,\n      }),\n    };\n  }\n\n  state.attributes.popper = {\n    ...state.attributes.popper,\n    'data-popper-placement': state.placement,\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ComputeStylesModifier = Modifier<'computeStyles', Options>;\nexport default ({\n  name: 'computeStyles',\n  enabled: true,\n  phase: 'beforeWrite',\n  fn: computeStyles,\n  data: {},\n}: ComputeStylesModifier);\n","// @flow\nimport type { Modifier, ModifierArguments } from '../types';\nimport getNodeName from '../dom-utils/getNodeName';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// This modifier takes the styles prepared by the `computeStyles` modifier\n// and applies them to the HTMLElements such as popper and arrow\n\nfunction applyStyles({ state }: ModifierArguments<{||}>) {\n  Object.keys(state.elements).forEach(name => {\n    const style = state.styles[name] || {};\n\n    const attributes = state.attributes[name] || {};\n    const element = state.elements[name];\n\n    // arrow is optional + virtual elements\n    if (!isHTMLElement(element) || !getNodeName(element)) {\n      return;\n    }\n\n    // Flow doesn't support to extend this property, but it's the most\n    // effective way to apply styles to an HTMLElement\n    // $FlowFixMe\n    Object.assign(element.style, style);\n\n    Object.keys(attributes).forEach(name => {\n      const value = attributes[name];\n      if (value === false) {\n        element.removeAttribute(name);\n      } else {\n        element.setAttribute(name, value === true ? 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 return style;\n      }, {});\n\n      // arrow is optional + virtual elements\n      if (!isHTMLElement(element) || !getNodeName(element)) {\n        return;\n      }\n\n      // Flow doesn't support to extend this property, but it's the most\n      // effective way to apply styles to an HTMLElement\n      // $FlowFixMe\n      Object.assign(element.style, style);\n\n      Object.keys(attributes).forEach(attribute => {\n        element.removeAttribute(attribute);\n      });\n    });\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ApplyStylesModifier = Modifier<'applyStyles', {||}>;\nexport default ({\n  name: 'applyStyles',\n  enabled: true,\n  phase: 'write',\n  fn: applyStyles,\n  effect,\n  requires: ['computeStyles'],\n}: ApplyStylesModifier);\n","// @flow\nimport { popperGenerator, detectOverflow } from './createPopper';\n\nimport eventListeners from './modifiers/eventListeners';\nimport popperOffsets from './modifiers/popperOffsets';\nimport 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diff --git a/web-tools/web/_static/popperjs/popper-lite.min.js b/web-tools/web/_static/popperjs/popper-lite.min.js
new file mode 100644
index 0000000..6f656c8
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-lite.min.js
@@ -0,0 +1,6 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
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t,o=e.popper,r=e.popperRect,i=e.placement,a=e.offsets,c=e.position,f=e.gpuAcceleration,p=e.adaptive,l=window.devicePixelRatio||1;e=Math.round(a.x*l)/l||0,l=Math.round(a.y*l)/l||0;var u=a.hasOwnProperty("x");a=a.hasOwnProperty("y");var d,h="left",g="top",b=window;if(p){var v=m(o);v===n(o)&&(v=s(o)),"top"===i&&(g="bottom",l-=v.clientHeight-r.height,l*=f?1:-1),"left"===i&&(h="right",e-=v.clientWidth-r.width,e*=f?1:-1)}return o=Object.assign({position:c},p&&k),f?Object.assign(Object.assign({},o),{},((d={})[g]=a?"0":"",d[h]=u?"0":"",d.transform=2>(b.devicePixelRatio||1)?"translate("+e+"px, "+l+"px)":"translate3d("+e+"px, "+l+"px, 0)",d)):Object.assign(Object.assign({},o),{},((t={})[g]=a?l+"px":"",t[h]=u?e+"px":"",t.transform="",t))}var E=["top","bottom","right","left"],L="beforeRead read afterRead beforeMain main afterMain beforeWrite write afterWrite".split(" "),P={placement:"bottom",modifiers:[],strategy:"absolute"},W={passive:!0},k={top:"auto",right:"auto",bottom:"auto",left:"auto"},D=[{name:"eventListeners",enabled:!0,phase:"write",fn:function(){},effect:function(e){var t=e.state,o=e.instance,r=(e=e.options).scroll,i=void 0===r||r,a=void 0===(e=e.resize)||e,s=n(t.elements.popper),c=[].concat(t.scrollParents.reference,t.scrollParents.popper);return i&&c.forEach((function(e){e.addEventListener("scroll",o.update,W)})),a&&s.addEventListener("resize",o.update,W),function(){i&&c.forEach((function(e){e.removeEventListener("scroll",o.update,W)})),a&&s.removeEventListener("resize",o.update,W)}},data:{}},{name:"popperOffsets",enabled:!0,phase:"read",fn:function(e){var t=e.state;t.modifiersData[e.name]=O({reference:t.rects.reference,element:t.rects.popper,strategy:"absolute",placement:t.placement})},data:{}},{name:"computeStyles",enabled:!0,phase:"beforeWrite",fn:function(e){var t=e.state,n=e.options;e=void 0===(e=n.gpuAcceleration)||e,n=void 0===(n=n.adaptive)||n,e={placement:t.placement.split("-")[0],popper:t.elements.popper,popperRect:t.rects.popper,gpuAcceleration:e},null!=t.modifiersData.popperOffsets&&(t.styles.popper=Object.assign(Object.assign({},t.styles.popper),M(Object.assign(Object.assign({},e),{},{offsets:t.modifiersData.popperOffsets,position:t.options.strategy,adaptive:n})))),null!=t.modifiersData.arrow&&(t.styles.arrow=Object.assign(Object.assign({},t.styles.arrow),M(Object.assign(Object.assign({},e),{},{offsets:t.modifiersData.arrow,position:"absolute",adaptive:!1})))),t.attributes.popper=Object.assign(Object.assign({},t.attributes.popper),{},{"data-popper-placement":t.placement})},data:{}},{name:"applyStyles",enabled:!0,phase:"write",fn:function(e){var t=e.state;Object.keys(t.elements).forEach((function(e){var n=t.styles[e]||{},o=t.attributes[e]||{},r=t.elements[e];i(r)&&a(r)&&(Object.assign(r.style,n),Object.keys(o).forEach((function(e){var t=o[e];!1===t?r.removeAttribute(e):r.setAttribute(e,!0===t?"":t)})))}))},effect:function(e){var t=e.state,n={popper:{position:t.options.strategy,left:"0",top:"0",margin:"0"},arrow:{position:"absolute"},reference:{}};return Object.assign(t.elements.popper.style,n.popper),t.elements.arrow&&Object.assign(t.elements.arrow.style,n.arrow),function(){Object.keys(t.elements).forEach((function(e){var o=t.elements[e],r=t.attributes[e]||{};e=Object.keys(t.styles.hasOwnProperty(e)?t.styles[e]:n[e]).reduce((function(e,t){return e[t]="",e}),{}),i(o)&&a(o)&&(Object.assign(o.style,e),Object.keys(r).forEach((function(e){o.removeAttribute(e)})))}))}},requires:["computeStyles"]}],R=j({defaultModifiers:D});e.createPopper=R,e.defaultModifiers=D,e.detectOverflow=function(e,n){void 0===n&&(n={});var o=n;n=void 0===(n=o.placement)?e.placement:n;var i=o.boundary,a=void 0===i?"clippingParents":i,c=void 0===(i=o.rootBoundary)?"viewport":i;i=void 0===(i=o.elementContext)?"popper":i;var f=o.altBoundary,p=void 0!==f&&f;o=function(e){return Object.assign(Object.assign({},{top:0,right:0,bottom:0,left:0}),e)}("number"!=typeof(o=void 0===(o=o.padding)?0:o)?o:function(e,t){return t.reduce((function(t,n){return t[n]=e,t}),{})}(o,E));var l=e.elements.reference;f=e.rects.popper,a=w(r(p=e.elements[p?"popper"===i?"reference":"popper":i])?p:p.contextElement||s(e.elements.popper),a,c),p=O({reference:c=t(l),element:f,strategy:"absolute",placement:n}),f=v(Object.assign(Object.assign({},f),p)),c="popper"===i?f:c;var u={top:a.top-c.top+o.top,bottom:c.bottom-a.bottom+o.bottom,left:a.left-c.left+o.left,right:c.right-a.right+o.right};if(e=e.modifiersData.offset,"popper"===i&&e){var d=e[n];Object.keys(u).forEach((function(e){var t=0<=["right","bottom"].indexOf(e)?1:-1,n=0<=["top","bottom"].indexOf(e)?"y":"x";u[e]+=d[n]*t}))}return u},e.popperGenerator=j,Object.defineProperty(e,"__esModule",{value:!0})}));
+//# sourceMappingURL=popper-lite.min.js.map
diff --git a/web-tools/web/_static/popperjs/popper-lite.min.js.flow b/web-tools/web/_static/popperjs/popper-lite.min.js.flow
new file mode 100644
index 0000000..8658c44
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-lite.min.js.flow
@@ -0,0 +1,3 @@
+// @flow
+
+export * from '../../lib/popper-lite.js'
diff --git a/web-tools/web/_static/popperjs/popper-lite.min.js.map b/web-tools/web/_static/popperjs/popper-lite.min.js.map
new file mode 100644
index 0000000..c3ab0f9
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper-lite.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper-lite.min.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/getOffsetParent.js","../../src/dom-utils/isTableElement.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/enums.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/dom-utils/contains.js","../../src/utils/computeOffsets.js","../../src/utils/getBasePlacement.js","../../src/utils/getVariation.js","../../src/utils/getMainAxisFromPlacement.js","../../src/createPopper.js","../../src/utils/mergeByName.js","../../src/dom-utils/getLayoutRect.js","../../src/modifiers/computeStyles.js","../../src/modifiers/eventListeners.js","../../src/popper-lite.js","../../src/modifiers/popperOffsets.js","../../src/modifiers/applyStyles.js","../../src/utils/detectOverflow.js","../../src/utils/mergePaddingObject.js","../../src/utils/getFreshSideObject.js","../../src/utils/expandToHashMap.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport getBasePlacement from './getBasePlacement';\nimport getVariation from './getVariation';\nimport getMainAxisFromPlacement from './getMainAxisFromPlacement';\nimport type {\n  Rect,\n  PositioningStrategy,\n  Offsets,\n  ClientRectObject,\n} from '../types';\nimport { top, right, bottom, left, start, end, type Placement } from '../enums';\n\nexport default function computeOffsets({\n  reference,\n  element,\n  placement,\n}: {\n  reference: Rect | ClientRectObject,\n  element: Rect | ClientRectObject,\n  strategy: PositioningStrategy,\n  placement?: Placement,\n}): Offsets {\n  const basePlacement = placement ? getBasePlacement(placement) : null;\n  const variation = placement ? getVariation(placement) : null;\n  const commonX = reference.x + reference.width / 2 - element.width / 2;\n  const commonY = reference.y + reference.height / 2 - element.height / 2;\n\n  let offsets;\n  switch (basePlacement) {\n    case top:\n      offsets = {\n        x: commonX,\n        y: reference.y - element.height,\n      };\n      break;\n    case bottom:\n      offsets = {\n        x: commonX,\n        y: reference.y + reference.height,\n      };\n      break;\n    case right:\n      offsets = {\n        x: reference.x + reference.width,\n        y: commonY,\n      };\n      break;\n    case left:\n      offsets = {\n        x: reference.x - element.width,\n        y: commonY,\n      };\n      break;\n    default:\n      offsets = {\n        x: reference.x,\n        y: reference.y,\n      };\n  }\n\n  const mainAxis = basePlacement\n    ? getMainAxisFromPlacement(basePlacement)\n    : null;\n\n  if (mainAxis != null) {\n    const len = mainAxis === 'y' ? 'height' : 'width';\n\n    switch (variation) {\n      case start:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) -\n          Math.floor(reference[len] / 2 - element[len] / 2);\n        break;\n      case end:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) +\n          Math.ceil(reference[len] / 2 - element[len] / 2);\n        break;\n      default:\n    }\n  }\n\n  return offsets;\n}\n","// @flow\nimport { type BasePlacement, type Placement, auto } from '../enums';\n\nexport default function getBasePlacement(\n  placement: Placement | typeof auto\n): BasePlacement {\n  return (placement.split('-')[0]: any);\n}\n","// @flow\nimport { type Variation, type Placement } from '../enums';\n\nexport default function getVariation(placement: Placement): ?Variation {\n  return (placement.split('-')[1]: any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nexport default function getMainAxisFromPlacement(\n  placement: Placement\n): 'x' | 'y' {\n  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow };\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport type {\n  PositioningStrategy,\n  Offsets,\n  Modifier,\n  ModifierArguments,\n  Rect,\n  Window,\n} from '../types';\nimport { type BasePlacement, top, left, right, bottom } from '../enums';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getWindow from '../dom-utils/getWindow';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport getComputedStyle from '../dom-utils/getComputedStyle';\nimport getBasePlacement from '../utils/getBasePlacement';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n};\n\nconst unsetSides = {\n  top: 'auto',\n  right: 'auto',\n  bottom: 'auto',\n  left: 'auto',\n};\n\n// Round the offsets to the nearest suitable subpixel based on the DPR.\n// Zooming can change the DPR, but it seems to report a value that will\n// cleanly divide the values into the appropriate subpixels.\nfunction roundOffsets({ x, y }): Offsets {\n  const win: Window = window;\n  const dpr = win.devicePixelRatio || 1;\n\n  return {\n    x: Math.round(x * dpr) / dpr || 0,\n    y: Math.round(y * dpr) / dpr || 0,\n  };\n}\n\nexport function mapToStyles({\n  popper,\n  popperRect,\n  placement,\n  offsets,\n  position,\n  gpuAcceleration,\n  adaptive,\n}: {\n  popper: HTMLElement,\n  popperRect: Rect,\n  placement: BasePlacement,\n  offsets: $Shape<{ x: number, y: number, centerOffset: number }>,\n  position: PositioningStrategy,\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n}) {\n  let { x, y } = roundOffsets(offsets);\n\n  const hasX = offsets.hasOwnProperty('x');\n  const hasY = offsets.hasOwnProperty('y');\n\n  let sideX: string = left;\n  let sideY: string = top;\n\n  const win: Window = window;\n\n  if (adaptive) {\n    let offsetParent = getOffsetParent(popper);\n    if (offsetParent === getWindow(popper)) {\n      offsetParent = getDocumentElement(popper);\n    }\n\n    // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it\n    /*:: offsetParent = (offsetParent: Element); */\n\n    if (placement === top) {\n      sideY = bottom;\n      y -= offsetParent.clientHeight - popperRect.height;\n      y *= gpuAcceleration ? 1 : -1;\n    }\n\n    if (placement === left) {\n      sideX = right;\n      x -= offsetParent.clientWidth - popperRect.width;\n      x *= gpuAcceleration ? 1 : -1;\n    }\n  }\n\n  const commonStyles = {\n    position,\n    ...(adaptive && unsetSides),\n  };\n\n  if (gpuAcceleration) {\n    return {\n      ...commonStyles,\n      [sideY]: hasY ? '0' : '',\n      [sideX]: hasX ? '0' : '',\n      // Layer acceleration can disable subpixel rendering which causes slightly\n      // blurry text on low PPI displays, so we want to use 2D transforms\n      // instead\n      transform:\n        (win.devicePixelRatio || 1) < 2\n          ? `translate(${x}px, ${y}px)`\n          : `translate3d(${x}px, ${y}px, 0)`,\n    };\n  }\n\n  return {\n    ...commonStyles,\n    [sideY]: hasY ? `${y}px` : '',\n    [sideX]: hasX ? `${x}px` : '',\n    transform: '',\n  };\n}\n\nfunction computeStyles({ state, options }: ModifierArguments<Options>) {\n  const { gpuAcceleration = true, adaptive = true } = options;\n\n  if (__DEV__) {\n    const transitionProperty =\n      getComputedStyle(state.elements.popper).transitionProperty || '';\n\n    if (\n      adaptive &&\n      ['transform', 'top', 'right', 'bottom', 'left'].some(\n        property => transitionProperty.indexOf(property) >= 0\n      )\n    ) {\n      console.warn(\n        [\n          'Popper: Detected CSS transitions on at least one of the following',\n          'CSS properties: \"transform\", \"top\", \"right\", \"bottom\", \"left\".',\n          '\\n\\n',\n          'Disable the \"computeStyles\" modifier\\'s `adaptive` option to allow',\n          'for smooth transitions, or remove these properties from the CSS',\n          'transition declaration on the popper element if only transitioning',\n          'opacity or background-color for example.',\n          '\\n\\n',\n          'We recommend using the popper element as a wrapper around an inner',\n          'element that can have any CSS property transitioned for animations.',\n        ].join(' ')\n      );\n    }\n  }\n\n  const commonStyles = {\n    placement: getBasePlacement(state.placement),\n    popper: state.elements.popper,\n    popperRect: state.rects.popper,\n    gpuAcceleration,\n  };\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.styles.popper = {\n      ...state.styles.popper,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.popperOffsets,\n        position: state.options.strategy,\n        adaptive,\n      }),\n    };\n  }\n\n  if (state.modifiersData.arrow != null) {\n    state.styles.arrow = {\n      ...state.styles.arrow,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.arrow,\n        position: 'absolute',\n        adaptive: false,\n      }),\n    };\n  }\n\n  state.attributes.popper = {\n    ...state.attributes.popper,\n    'data-popper-placement': state.placement,\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ComputeStylesModifier = Modifier<'computeStyles', Options>;\nexport default ({\n  name: 'computeStyles',\n  enabled: true,\n  phase: 'beforeWrite',\n  fn: computeStyles,\n  data: {},\n}: ComputeStylesModifier);\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport getWindow from '../dom-utils/getWindow';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  scroll: boolean,\n  resize: boolean,\n};\n\nconst passive = { passive: true };\n\nfunction effect({ state, instance, options }: ModifierArguments<Options>) {\n  const { scroll = true, resize = true } = options;\n\n  const window = getWindow(state.elements.popper);\n  const scrollParents = [\n    ...state.scrollParents.reference,\n    ...state.scrollParents.popper,\n  ];\n\n  if (scroll) {\n    scrollParents.forEach(scrollParent => {\n      scrollParent.addEventListener('scroll', instance.update, passive);\n    });\n  }\n\n  if (resize) {\n    window.addEventListener('resize', instance.update, passive);\n  }\n\n  return () => {\n    if (scroll) {\n      scrollParents.forEach(scrollParent => {\n        scrollParent.removeEventListener('scroll', instance.update, passive);\n      });\n    }\n\n    if (resize) {\n      window.removeEventListener('resize', instance.update, passive);\n    }\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type EventListenersModifier = Modifier<'eventListeners', Options>;\nexport default ({\n  name: 'eventListeners',\n  enabled: true,\n  phase: 'write',\n  fn: () => {},\n  effect,\n  data: {},\n}: EventListenersModifier);\n","// @flow\nimport { popperGenerator, detectOverflow } from './createPopper';\n\nimport eventListeners from './modifiers/eventListeners';\nimport popperOffsets from './modifiers/popperOffsets';\nimport computeStyles from './modifiers/computeStyles';\nimport applyStyles from './modifiers/applyStyles';\n\nexport type * from './types';\n\nconst defaultModifiers = [\n  eventListeners,\n  popperOffsets,\n  computeStyles,\n  applyStyles,\n];\n\nconst createPopper = popperGenerator({ defaultModifiers });\n\n// eslint-disable-next-line import/no-unused-modules\nexport { createPopper, popperGenerator, defaultModifiers, detectOverflow };\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport computeOffsets from '../utils/computeOffsets';\n\nfunction popperOffsets({ state, name }: ModifierArguments<{||}>) {\n  // Offsets are the actual position the popper needs to have to be\n  // properly positioned near its reference element\n  // This is the most basic placement, and will be adjusted by\n  // the modifiers in the next step\n  state.modifiersData[name] = computeOffsets({\n    reference: state.rects.reference,\n    element: state.rects.popper,\n    strategy: 'absolute',\n    placement: state.placement,\n  });\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PopperOffsetsModifier = Modifier<'popperOffsets', {||}>;\nexport default ({\n  name: 'popperOffsets',\n  enabled: true,\n  phase: 'read',\n  fn: popperOffsets,\n  data: {},\n}: PopperOffsetsModifier);\n","// @flow\nimport type { Modifier, ModifierArguments } from '../types';\nimport getNodeName from '../dom-utils/getNodeName';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// This modifier takes the styles prepared by the `computeStyles` modifier\n// and applies them to the HTMLElements such as popper and arrow\n\nfunction applyStyles({ state }: ModifierArguments<{||}>) {\n  Object.keys(state.elements).forEach(name => {\n    const style = state.styles[name] || {};\n\n    const attributes = state.attributes[name] || {};\n    const element = state.elements[name];\n\n    // arrow is optional + virtual elements\n    if (!isHTMLElement(element) || !getNodeName(element)) {\n      return;\n    }\n\n    // Flow doesn't support to extend this property, but it's the most\n    // effective way to apply styles to an HTMLElement\n    // $FlowFixMe\n    Object.assign(element.style, style);\n\n    Object.keys(attributes).forEach(name => {\n      const value = attributes[name];\n      if (value === false) {\n        element.removeAttribute(name);\n      } else {\n        element.setAttribute(name, value === true ? '' : value);\n      }\n    });\n  });\n}\n\nfunction effect({ state }: ModifierArguments<{||}>) {\n  const initialStyles = {\n    popper: {\n      position: state.options.strategy,\n      left: '0',\n      top: '0',\n      margin: '0',\n    },\n    arrow: {\n      position: 'absolute',\n    },\n    reference: {},\n  };\n\n  Object.assign(state.elements.popper.style, initialStyles.popper);\n\n  if (state.elements.arrow) {\n    Object.assign(state.elements.arrow.style, initialStyles.arrow);\n  }\n\n  return () => {\n    Object.keys(state.elements).forEach(name => {\n      const element = state.elements[name];\n      const attributes = state.attributes[name] || {};\n\n      const styleProperties = Object.keys(\n        state.styles.hasOwnProperty(name)\n          ? state.styles[name]\n          : initialStyles[name]\n      );\n\n      // Set all values to an empty string to unset them\n      const style = styleProperties.reduce((style, property) => {\n        style[property] = '';\n        return style;\n      }, {});\n\n      // arrow is optional + virtual elements\n      if (!isHTMLElement(element) || !getNodeName(element)) {\n        return;\n      }\n\n      // Flow doesn't support to extend this property, but it's the most\n      // effective way to apply styles to an HTMLElement\n      // $FlowFixMe\n      Object.assign(element.style, style);\n\n      Object.keys(attributes).forEach(attribute => {\n        element.removeAttribute(attribute);\n      });\n    });\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ApplyStylesModifier = Modifier<'applyStyles', {||}>;\nexport default ({\n  name: 'applyStyles',\n  enabled: true,\n  phase: 'write',\n  fn: applyStyles,\n  effect,\n  requires: ['computeStyles'],\n}: ApplyStylesModifier);\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';\n      overflowOffsets[key] += offset[axis] * multiply;\n    });\n  }\n\n  return overflowOffsets;\n}\n","// @flow\nimport type { SideObject } from '../types';\nimport getFreshSideObject from './getFreshSideObject';\n\nexport default function mergePaddingObject(\n  paddingObject: $Shape<SideObject>\n): SideObject {\n  return {\n    ...getFreshSideObject(),\n    ...paddingObject,\n  };\n}\n","// @flow\nimport type { SideObject } from '../types';\n\nexport default function getFreshSideObject(): SideObject {\n  return {\n    top: 0,\n    right: 0,\n    bottom: 0,\n    left: 0,\n  };\n}\n","// @flow\n\nexport default function expandToHashMap<\n  T: number | string | boolean,\n  K: string\n>(value: T, keys: Array<K>): { [key: string]: T } {\n  return keys.reduce((hashMap, key) => {\n    hashMap[key] = value;\n    return hashMap;\n  }, 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+\ No newline at end of file
diff --git a/web-tools/web/_static/popperjs/popper.js b/web-tools/web/_static/popperjs/popper.js
new file mode 100644
index 0000000..b7103be
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper.js
@@ -0,0 +1,1872 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = global || self, factory(global.Popper = {}));
+}(this, (function (exports) { 'use strict';
+
+  function getBoundingClientRect(element) {
+    var rect = element.getBoundingClientRect();
+    return {
+      width: rect.width,
+      height: rect.height,
+      top: rect.top,
+      right: rect.right,
+      bottom: rect.bottom,
+      left: rect.left,
+      x: rect.left,
+      y: rect.top
+    };
+  }
+
+  /*:: import type { Window } from '../types'; */
+
+  /*:: declare function getWindow(node: Node | Window): Window; */
+  function getWindow(node) {
+    if (node.toString() !== '[object Window]') {
+      var ownerDocument = node.ownerDocument;
+      return ownerDocument ? ownerDocument.defaultView || window : window;
+    }
+
+    return node;
+  }
+
+  function getWindowScroll(node) {
+    var win = getWindow(node);
+    var scrollLeft = win.pageXOffset;
+    var scrollTop = win.pageYOffset;
+    return {
+      scrollLeft: scrollLeft,
+      scrollTop: scrollTop
+    };
+  }
+
+  /*:: declare function isElement(node: mixed): boolean %checks(node instanceof
+    Element); */
+
+  function isElement(node) {
+    var OwnElement = getWindow(node).Element;
+    return node instanceof OwnElement || node instanceof Element;
+  }
+  /*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof
+    HTMLElement); */
+
+
+  function isHTMLElement(node) {
+    var OwnElement = getWindow(node).HTMLElement;
+    return node instanceof OwnElement || node instanceof HTMLElement;
+  }
+  /*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof
+    ShadowRoot); */
+
+
+  function isShadowRoot(node) {
+    var OwnElement = getWindow(node).ShadowRoot;
+    return node instanceof OwnElement || node instanceof ShadowRoot;
+  }
+
+  function getHTMLElementScroll(element) {
+    return {
+      scrollLeft: element.scrollLeft,
+      scrollTop: element.scrollTop
+    };
+  }
+
+  function getNodeScroll(node) {
+    if (node === getWindow(node) || !isHTMLElement(node)) {
+      return getWindowScroll(node);
+    } else {
+      return getHTMLElementScroll(node);
+    }
+  }
+
+  function getNodeName(element) {
+    return element ? (element.nodeName || '').toLowerCase() : null;
+  }
+
+  function getDocumentElement(element) {
+    // $FlowFixMe: assume body is always available
+    return ((isElement(element) ? element.ownerDocument : element.document) || window.document).documentElement;
+  }
+
+  function getWindowScrollBarX(element) {
+    // If <html> has a CSS width greater than the viewport, then this will be
+    // incorrect for RTL.
+    // Popper 1 is broken in this case and never had a bug report so let's assume
+    // it's not an issue. I don't think anyone ever specifies width on <html>
+    // anyway.
+    // Browsers where the left scrollbar doesn't cause an issue report `0` for
+    // this (e.g. Edge 2019, IE11, Safari)
+    return getBoundingClientRect(getDocumentElement(element)).left + getWindowScroll(element).scrollLeft;
+  }
+
+  function getComputedStyle(element) {
+    return getWindow(element).getComputedStyle(element);
+  }
+
+  function isScrollParent(element) {
+    // Firefox wants us to check `-x` and `-y` variations as well
+    var _getComputedStyle = getComputedStyle(element),
+        overflow = _getComputedStyle.overflow,
+        overflowX = _getComputedStyle.overflowX,
+        overflowY = _getComputedStyle.overflowY;
+
+    return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);
+  }
+
+  // Composite means it takes into account transforms as well as layout.
+
+  function getCompositeRect(elementOrVirtualElement, offsetParent, isFixed) {
+    if (isFixed === void 0) {
+      isFixed = false;
+    }
+
+    var documentElement = getDocumentElement(offsetParent);
+    var rect = getBoundingClientRect(elementOrVirtualElement);
+    var isOffsetParentAnElement = isHTMLElement(offsetParent);
+    var scroll = {
+      scrollLeft: 0,
+      scrollTop: 0
+    };
+    var offsets = {
+      x: 0,
+      y: 0
+    };
+
+    if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
+      if (getNodeName(offsetParent) !== 'body' || // https://github.com/popperjs/popper-core/issues/1078
+      isScrollParent(documentElement)) {
+        scroll = getNodeScroll(offsetParent);
+      }
+
+      if (isHTMLElement(offsetParent)) {
+        offsets = getBoundingClientRect(offsetParent);
+        offsets.x += offsetParent.clientLeft;
+        offsets.y += offsetParent.clientTop;
+      } else if (documentElement) {
+        offsets.x = getWindowScrollBarX(documentElement);
+      }
+    }
+
+    return {
+      x: rect.left + scroll.scrollLeft - offsets.x,
+      y: rect.top + scroll.scrollTop - offsets.y,
+      width: rect.width,
+      height: rect.height
+    };
+  }
+
+  // Returns the layout rect of an element relative to its offsetParent. Layout
+  // means it doesn't take into account transforms.
+  function getLayoutRect(element) {
+    return {
+      x: element.offsetLeft,
+      y: element.offsetTop,
+      width: element.offsetWidth,
+      height: element.offsetHeight
+    };
+  }
+
+  function getParentNode(element) {
+    if (getNodeName(element) === 'html') {
+      return element;
+    }
+
+    return (// $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle
+      element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
+      element.parentNode || // DOM Element detected
+      // $FlowFixMe: need a better way to handle this...
+      element.host || // ShadowRoot detected
+      // $FlowFixMe: HTMLElement is a Node
+      getDocumentElement(element) // fallback
+
+    );
+  }
+
+  function getScrollParent(node) {
+    if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {
+      // $FlowFixMe: assume body is always available
+      return node.ownerDocument.body;
+    }
+
+    if (isHTMLElement(node) && isScrollParent(node)) {
+      return node;
+    }
+
+    return getScrollParent(getParentNode(node));
+  }
+
+  /*
+  given a DOM element, return the list of all scroll parents, up the list of ancesors
+  until we get to the top window object. This list is what we attach scroll listeners
+  to, because if any of these parent elements scroll, we'll need to re-calculate the 
+  reference element's position.
+  */
+
+  function listScrollParents(element, list) {
+    if (list === void 0) {
+      list = [];
+    }
+
+    var scrollParent = getScrollParent(element);
+    var isBody = getNodeName(scrollParent) === 'body';
+    var win = getWindow(scrollParent);
+    var target = isBody ? [win].concat(win.visualViewport || [], isScrollParent(scrollParent) ? scrollParent : []) : scrollParent;
+    var updatedList = list.concat(target);
+    return isBody ? updatedList : // $FlowFixMe: isBody tells us target will be an HTMLElement here
+    updatedList.concat(listScrollParents(getParentNode(target)));
+  }
+
+  function isTableElement(element) {
+    return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;
+  }
+
+  function getTrueOffsetParent(element) {
+    if (!isHTMLElement(element) || // https://github.com/popperjs/popper-core/issues/837
+    getComputedStyle(element).position === 'fixed') {
+      return null;
+    }
+
+    var offsetParent = element.offsetParent;
+
+    if (offsetParent) {
+      var html = getDocumentElement(offsetParent);
+
+      if (getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static' && getComputedStyle(html).position !== 'static') {
+        return html;
+      }
+    }
+
+    return offsetParent;
+  } // `.offsetParent` reports `null` for fixed elements, while absolute elements
+  // return the containing block
+
+
+  function getContainingBlock(element) {
+    var currentNode = getParentNode(element);
+
+    while (isHTMLElement(currentNode) && ['html', 'body'].indexOf(getNodeName(currentNode)) < 0) {
+      var css = getComputedStyle(currentNode); // This is non-exhaustive but covers the most common CSS properties that
+      // create a containing block.
+
+      if (css.transform !== 'none' || css.perspective !== 'none' || css.willChange && css.willChange !== 'auto') {
+        return currentNode;
+      } else {
+        currentNode = currentNode.parentNode;
+      }
+    }
+
+    return null;
+  } // Gets the closest ancestor positioned element. Handles some edge cases,
+  // such as table ancestors and cross browser bugs.
+
+
+  function getOffsetParent(element) {
+    var window = getWindow(element);
+    var offsetParent = getTrueOffsetParent(element);
+
+    while (offsetParent && isTableElement(offsetParent) && getComputedStyle(offsetParent).position === 'static') {
+      offsetParent = getTrueOffsetParent(offsetParent);
+    }
+
+    if (offsetParent && getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static') {
+      return window;
+    }
+
+    return offsetParent || getContainingBlock(element) || window;
+  }
+
+  var top = 'top';
+  var bottom = 'bottom';
+  var right = 'right';
+  var left = 'left';
+  var auto = 'auto';
+  var basePlacements = [top, bottom, right, left];
+  var start = 'start';
+  var end = 'end';
+  var clippingParents = 'clippingParents';
+  var viewport = 'viewport';
+  var popper = 'popper';
+  var reference = 'reference';
+  var variationPlacements = /*#__PURE__*/basePlacements.reduce(function (acc, placement) {
+    return acc.concat([placement + "-" + start, placement + "-" + end]);
+  }, []);
+  var placements = /*#__PURE__*/[].concat(basePlacements, [auto]).reduce(function (acc, placement) {
+    return acc.concat([placement, placement + "-" + start, placement + "-" + end]);
+  }, []); // modifiers that need to read the DOM
+
+  var beforeRead = 'beforeRead';
+  var read = 'read';
+  var afterRead = 'afterRead'; // pure-logic modifiers
+
+  var beforeMain = 'beforeMain';
+  var main = 'main';
+  var afterMain = 'afterMain'; // modifier with the purpose to write to the DOM (or write into a framework state)
+
+  var beforeWrite = 'beforeWrite';
+  var write = 'write';
+  var afterWrite = 'afterWrite';
+  var modifierPhases = [beforeRead, read, afterRead, beforeMain, main, afterMain, beforeWrite, write, afterWrite];
+
+  function order(modifiers) {
+    var map = new Map();
+    var visited = new Set();
+    var result = [];
+    modifiers.forEach(function (modifier) {
+      map.set(modifier.name, modifier);
+    }); // On visiting object, check for its dependencies and visit them recursively
+
+    function sort(modifier) {
+      visited.add(modifier.name);
+      var requires = [].concat(modifier.requires || [], modifier.requiresIfExists || []);
+      requires.forEach(function (dep) {
+        if (!visited.has(dep)) {
+          var depModifier = map.get(dep);
+
+          if (depModifier) {
+            sort(depModifier);
+          }
+        }
+      });
+      result.push(modifier);
+    }
+
+    modifiers.forEach(function (modifier) {
+      if (!visited.has(modifier.name)) {
+        // check for visited object
+        sort(modifier);
+      }
+    });
+    return result;
+  }
+
+  function orderModifiers(modifiers) {
+    // order based on dependencies
+    var orderedModifiers = order(modifiers); // order based on phase
+
+    return modifierPhases.reduce(function (acc, phase) {
+      return acc.concat(orderedModifiers.filter(function (modifier) {
+        return modifier.phase === phase;
+      }));
+    }, []);
+  }
+
+  function debounce(fn) {
+    var pending;
+    return function () {
+      if (!pending) {
+        pending = new Promise(function (resolve) {
+          Promise.resolve().then(function () {
+            pending = undefined;
+            resolve(fn());
+          });
+        });
+      }
+
+      return pending;
+    };
+  }
+
+  function format(str) {
+    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      args[_key - 1] = arguments[_key];
+    }
+
+    return [].concat(args).reduce(function (p, c) {
+      return p.replace(/%s/, c);
+    }, str);
+  }
+
+  var INVALID_MODIFIER_ERROR = 'Popper: modifier "%s" provided an invalid %s property, expected %s but got %s';
+  var MISSING_DEPENDENCY_ERROR = 'Popper: modifier "%s" requires "%s", but "%s" modifier is not available';
+  var VALID_PROPERTIES = ['name', 'enabled', 'phase', 'fn', 'effect', 'requires', 'options'];
+  function validateModifiers(modifiers) {
+    modifiers.forEach(function (modifier) {
+      Object.keys(modifier).forEach(function (key) {
+        switch (key) {
+          case 'name':
+            if (typeof modifier.name !== 'string') {
+              console.error(format(INVALID_MODIFIER_ERROR, String(modifier.name), '"name"', '"string"', "\"" + String(modifier.name) + "\""));
+            }
+
+            break;
+
+          case 'enabled':
+            if (typeof modifier.enabled !== 'boolean') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"enabled"', '"boolean"', "\"" + String(modifier.enabled) + "\""));
+            }
+
+          case 'phase':
+            if (modifierPhases.indexOf(modifier.phase) < 0) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"phase"', "either " + modifierPhases.join(', '), "\"" + String(modifier.phase) + "\""));
+            }
+
+            break;
+
+          case 'fn':
+            if (typeof modifier.fn !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"fn"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'effect':
+            if (typeof modifier.effect !== 'function') {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"effect"', '"function"', "\"" + String(modifier.fn) + "\""));
+            }
+
+            break;
+
+          case 'requires':
+            if (!Array.isArray(modifier.requires)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requires"', '"array"', "\"" + String(modifier.requires) + "\""));
+            }
+
+            break;
+
+          case 'requiresIfExists':
+            if (!Array.isArray(modifier.requiresIfExists)) {
+              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requiresIfExists"', '"array"', "\"" + String(modifier.requiresIfExists) + "\""));
+            }
+
+            break;
+
+          case 'options':
+          case 'data':
+            break;
+
+          default:
+            console.error("PopperJS: an invalid property has been provided to the \"" + modifier.name + "\" modifier, valid properties are " + VALID_PROPERTIES.map(function (s) {
+              return "\"" + s + "\"";
+            }).join(', ') + "; but \"" + key + "\" was provided.");
+        }
+
+        modifier.requires && modifier.requires.forEach(function (requirement) {
+          if (modifiers.find(function (mod) {
+            return mod.name === requirement;
+          }) == null) {
+            console.error(format(MISSING_DEPENDENCY_ERROR, String(modifier.name), requirement, requirement));
+          }
+        });
+      });
+    });
+  }
+
+  function uniqueBy(arr, fn) {
+    var identifiers = new Set();
+    return arr.filter(function (item) {
+      var identifier = fn(item);
+
+      if (!identifiers.has(identifier)) {
+        identifiers.add(identifier);
+        return true;
+      }
+    });
+  }
+
+  function getBasePlacement(placement) {
+    return placement.split('-')[0];
+  }
+
+  function mergeByName(modifiers) {
+    var merged = modifiers.reduce(function (merged, current) {
+      var existing = merged[current.name];
+      merged[current.name] = existing ? Object.assign(Object.assign(Object.assign({}, existing), current), {}, {
+        options: Object.assign(Object.assign({}, existing.options), current.options),
+        data: Object.assign(Object.assign({}, existing.data), current.data)
+      }) : current;
+      return merged;
+    }, {}); // IE11 does not support Object.values
+
+    return Object.keys(merged).map(function (key) {
+      return merged[key];
+    });
+  }
+
+  function getViewportRect(element) {
+    var win = getWindow(element);
+    var html = getDocumentElement(element);
+    var visualViewport = win.visualViewport;
+    var width = html.clientWidth;
+    var height = html.clientHeight;
+    var x = 0;
+    var y = 0; // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper
+    // can be obscured underneath it.
+    // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even
+    // if it isn't open, so if this isn't available, the popper will be detected
+    // to overflow the bottom of the screen too early.
+
+    if (visualViewport) {
+      width = visualViewport.width;
+      height = visualViewport.height; // Uses Layout Viewport (like Chrome; Safari does not currently)
+      // In Chrome, it returns a value very close to 0 (+/-) but contains rounding
+      // errors due to floating point numbers, so we need to check precision.
+      // Safari returns a number <= 0, usually < -1 when pinch-zoomed
+      // Feature detection fails in mobile emulation mode in Chrome.
+      // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <
+      // 0.001
+      // Fallback here: "Not Safari" userAgent
+
+      if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
+        x = visualViewport.offsetLeft;
+        y = visualViewport.offsetTop;
+      }
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x + getWindowScrollBarX(element),
+      y: y
+    };
+  }
+
+  // of the `<html>` and `<body>` rect bounds if horizontally scrollable
+
+  function getDocumentRect(element) {
+    var html = getDocumentElement(element);
+    var winScroll = getWindowScroll(element);
+    var body = element.ownerDocument.body;
+    var width = Math.max(html.scrollWidth, html.clientWidth, body ? body.scrollWidth : 0, body ? body.clientWidth : 0);
+    var height = Math.max(html.scrollHeight, html.clientHeight, body ? body.scrollHeight : 0, body ? body.clientHeight : 0);
+    var x = -winScroll.scrollLeft + getWindowScrollBarX(element);
+    var y = -winScroll.scrollTop;
+
+    if (getComputedStyle(body || html).direction === 'rtl') {
+      x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;
+    }
+
+    return {
+      width: width,
+      height: height,
+      x: x,
+      y: y
+    };
+  }
+
+  function contains(parent, child) {
+    var rootNode = child.getRootNode && child.getRootNode(); // First, attempt with faster native method
+
+    if (parent.contains(child)) {
+      return true;
+    } // then fallback to custom implementation with Shadow DOM support
+    else if (rootNode && isShadowRoot(rootNode)) {
+        var next = child;
+
+        do {
+          if (next && parent.isSameNode(next)) {
+            return true;
+          } // $FlowFixMe: need a better way to handle this...
+
+
+          next = next.parentNode || next.host;
+        } while (next);
+      } // Give up, the result is false
+
+
+    return false;
+  }
+
+  function rectToClientRect(rect) {
+    return Object.assign(Object.assign({}, rect), {}, {
+      left: rect.x,
+      top: rect.y,
+      right: rect.x + rect.width,
+      bottom: rect.y + rect.height
+    });
+  }
+
+  function getInnerBoundingClientRect(element) {
+    var rect = getBoundingClientRect(element);
+    rect.top = rect.top + element.clientTop;
+    rect.left = rect.left + element.clientLeft;
+    rect.bottom = rect.top + element.clientHeight;
+    rect.right = rect.left + element.clientWidth;
+    rect.width = element.clientWidth;
+    rect.height = element.clientHeight;
+    rect.x = rect.left;
+    rect.y = rect.top;
+    return rect;
+  }
+
+  function getClientRectFromMixedType(element, clippingParent) {
+    return clippingParent === viewport ? rectToClientRect(getViewportRect(element)) : isHTMLElement(clippingParent) ? getInnerBoundingClientRect(clippingParent) : rectToClientRect(getDocumentRect(getDocumentElement(element)));
+  } // A "clipping parent" is an overflowable container with the characteristic of
+  // clipping (or hiding) overflowing elements with a position different from
+  // `initial`
+
+
+  function getClippingParents(element) {
+    var clippingParents = listScrollParents(getParentNode(element));
+    var canEscapeClipping = ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;
+    var clipperElement = canEscapeClipping && isHTMLElement(element) ? getOffsetParent(element) : element;
+
+    if (!isElement(clipperElement)) {
+      return [];
+    } // $FlowFixMe: https://github.com/facebook/flow/issues/1414
+
+
+    return clippingParents.filter(function (clippingParent) {
+      return isElement(clippingParent) && contains(clippingParent, clipperElement) && getNodeName(clippingParent) !== 'body';
+    });
+  } // Gets the maximum area that the element is visible in due to any number of
+  // clipping parents
+
+
+  function getClippingRect(element, boundary, rootBoundary) {
+    var mainClippingParents = boundary === 'clippingParents' ? getClippingParents(element) : [].concat(boundary);
+    var clippingParents = [].concat(mainClippingParents, [rootBoundary]);
+    var firstClippingParent = clippingParents[0];
+    var clippingRect = clippingParents.reduce(function (accRect, clippingParent) {
+      var rect = getClientRectFromMixedType(element, clippingParent);
+      accRect.top = Math.max(rect.top, accRect.top);
+      accRect.right = Math.min(rect.right, accRect.right);
+      accRect.bottom = Math.min(rect.bottom, accRect.bottom);
+      accRect.left = Math.max(rect.left, accRect.left);
+      return accRect;
+    }, getClientRectFromMixedType(element, firstClippingParent));
+    clippingRect.width = clippingRect.right - clippingRect.left;
+    clippingRect.height = clippingRect.bottom - clippingRect.top;
+    clippingRect.x = clippingRect.left;
+    clippingRect.y = clippingRect.top;
+    return clippingRect;
+  }
+
+  function getVariation(placement) {
+    return placement.split('-')[1];
+  }
+
+  function getMainAxisFromPlacement(placement) {
+    return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';
+  }
+
+  function computeOffsets(_ref) {
+    var reference = _ref.reference,
+        element = _ref.element,
+        placement = _ref.placement;
+    var basePlacement = placement ? getBasePlacement(placement) : null;
+    var variation = placement ? getVariation(placement) : null;
+    var commonX = reference.x + reference.width / 2 - element.width / 2;
+    var commonY = reference.y + reference.height / 2 - element.height / 2;
+    var offsets;
+
+    switch (basePlacement) {
+      case top:
+        offsets = {
+          x: commonX,
+          y: reference.y - element.height
+        };
+        break;
+
+      case bottom:
+        offsets = {
+          x: commonX,
+          y: reference.y + reference.height
+        };
+        break;
+
+      case right:
+        offsets = {
+          x: reference.x + reference.width,
+          y: commonY
+        };
+        break;
+
+      case left:
+        offsets = {
+          x: reference.x - element.width,
+          y: commonY
+        };
+        break;
+
+      default:
+        offsets = {
+          x: reference.x,
+          y: reference.y
+        };
+    }
+
+    var mainAxis = basePlacement ? getMainAxisFromPlacement(basePlacement) : null;
+
+    if (mainAxis != null) {
+      var len = mainAxis === 'y' ? 'height' : 'width';
+
+      switch (variation) {
+        case start:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) - Math.floor(reference[len] / 2 - element[len] / 2);
+          break;
+
+        case end:
+          offsets[mainAxis] = Math.floor(offsets[mainAxis]) + Math.ceil(reference[len] / 2 - element[len] / 2);
+          break;
+      }
+    }
+
+    return offsets;
+  }
+
+  function getFreshSideObject() {
+    return {
+      top: 0,
+      right: 0,
+      bottom: 0,
+      left: 0
+    };
+  }
+
+  function mergePaddingObject(paddingObject) {
+    return Object.assign(Object.assign({}, getFreshSideObject()), paddingObject);
+  }
+
+  function expandToHashMap(value, keys) {
+    return keys.reduce(function (hashMap, key) {
+      hashMap[key] = value;
+      return hashMap;
+    }, {});
+  }
+
+  function detectOverflow(state, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    var _options = options,
+        _options$placement = _options.placement,
+        placement = _options$placement === void 0 ? state.placement : _options$placement,
+        _options$boundary = _options.boundary,
+        boundary = _options$boundary === void 0 ? clippingParents : _options$boundary,
+        _options$rootBoundary = _options.rootBoundary,
+        rootBoundary = _options$rootBoundary === void 0 ? viewport : _options$rootBoundary,
+        _options$elementConte = _options.elementContext,
+        elementContext = _options$elementConte === void 0 ? popper : _options$elementConte,
+        _options$altBoundary = _options.altBoundary,
+        altBoundary = _options$altBoundary === void 0 ? false : _options$altBoundary,
+        _options$padding = _options.padding,
+        padding = _options$padding === void 0 ? 0 : _options$padding;
+    var paddingObject = mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
+    var altContext = elementContext === popper ? reference : popper;
+    var referenceElement = state.elements.reference;
+    var popperRect = state.rects.popper;
+    var element = state.elements[altBoundary ? altContext : elementContext];
+    var clippingClientRect = getClippingRect(isElement(element) ? element : element.contextElement || getDocumentElement(state.elements.popper), boundary, rootBoundary);
+    var referenceClientRect = getBoundingClientRect(referenceElement);
+    var popperOffsets = computeOffsets({
+      reference: referenceClientRect,
+      element: popperRect,
+      strategy: 'absolute',
+      placement: placement
+    });
+    var popperClientRect = rectToClientRect(Object.assign(Object.assign({}, popperRect), popperOffsets));
+    var elementClientRect = elementContext === popper ? popperClientRect : referenceClientRect; // positive = overflowing the clipping rect
+    // 0 or negative = within the clipping rect
+
+    var overflowOffsets = {
+      top: clippingClientRect.top - elementClientRect.top + paddingObject.top,
+      bottom: elementClientRect.bottom - clippingClientRect.bottom + paddingObject.bottom,
+      left: clippingClientRect.left - elementClientRect.left + paddingObject.left,
+      right: elementClientRect.right - clippingClientRect.right + paddingObject.right
+    };
+    var offsetData = state.modifiersData.offset; // Offsets can be applied only to the popper element
+
+    if (elementContext === popper && offsetData) {
+      var offset = offsetData[placement];
+      Object.keys(overflowOffsets).forEach(function (key) {
+        var multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;
+        var axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';
+        overflowOffsets[key] += offset[axis] * multiply;
+      });
+    }
+
+    return overflowOffsets;
+  }
+
+  var INVALID_ELEMENT_ERROR = 'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';
+  var INFINITE_LOOP_ERROR = 'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';
+  var DEFAULT_OPTIONS = {
+    placement: 'bottom',
+    modifiers: [],
+    strategy: 'absolute'
+  };
+
+  function areValidElements() {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    return !args.some(function (element) {
+      return !(element && typeof element.getBoundingClientRect === 'function');
+    });
+  }
+
+  function popperGenerator(generatorOptions) {
+    if (generatorOptions === void 0) {
+      generatorOptions = {};
+    }
+
+    var _generatorOptions = generatorOptions,
+        _generatorOptions$def = _generatorOptions.defaultModifiers,
+        defaultModifiers = _generatorOptions$def === void 0 ? [] : _generatorOptions$def,
+        _generatorOptions$def2 = _generatorOptions.defaultOptions,
+        defaultOptions = _generatorOptions$def2 === void 0 ? DEFAULT_OPTIONS : _generatorOptions$def2;
+    return function createPopper(reference, popper, options) {
+      if (options === void 0) {
+        options = defaultOptions;
+      }
+
+      var state = {
+        placement: 'bottom',
+        orderedModifiers: [],
+        options: Object.assign(Object.assign({}, DEFAULT_OPTIONS), defaultOptions),
+        modifiersData: {},
+        elements: {
+          reference: reference,
+          popper: popper
+        },
+        attributes: {},
+        styles: {}
+      };
+      var effectCleanupFns = [];
+      var isDestroyed = false;
+      var instance = {
+        state: state,
+        setOptions: function setOptions(options) {
+          cleanupModifierEffects();
+          state.options = Object.assign(Object.assign(Object.assign({}, defaultOptions), state.options), options);
+          state.scrollParents = {
+            reference: isElement(reference) ? listScrollParents(reference) : reference.contextElement ? listScrollParents(reference.contextElement) : [],
+            popper: listScrollParents(popper)
+          }; // Orders the modifiers based on their dependencies and `phase`
+          // properties
+
+          var orderedModifiers = orderModifiers(mergeByName([].concat(defaultModifiers, state.options.modifiers))); // Strip out disabled modifiers
+
+          state.orderedModifiers = orderedModifiers.filter(function (m) {
+            return m.enabled;
+          }); // Validate the provided modifiers so that the consumer will get warned
+          // if one of the modifiers is invalid for any reason
+
+          {
+            var modifiers = uniqueBy([].concat(orderedModifiers, state.options.modifiers), function (_ref) {
+              var name = _ref.name;
+              return name;
+            });
+            validateModifiers(modifiers);
+
+            if (getBasePlacement(state.options.placement) === auto) {
+              var flipModifier = state.orderedModifiers.find(function (_ref2) {
+                var name = _ref2.name;
+                return name === 'flip';
+              });
+
+              if (!flipModifier) {
+                console.error(['Popper: "auto" placements require the "flip" modifier be', 'present and enabled to work.'].join(' '));
+              }
+            }
+
+            var _getComputedStyle = getComputedStyle(popper),
+                marginTop = _getComputedStyle.marginTop,
+                marginRight = _getComputedStyle.marginRight,
+                marginBottom = _getComputedStyle.marginBottom,
+                marginLeft = _getComputedStyle.marginLeft; // We no longer take into account `margins` on the popper, and it can
+            // cause bugs with positioning, so we'll warn the consumer
+
+
+            if ([marginTop, marginRight, marginBottom, marginLeft].some(function (margin) {
+              return parseFloat(margin);
+            })) {
+              console.warn(['Popper: CSS "margin" styles cannot be used to apply padding', 'between the popper and its reference element or boundary.', 'To replicate margin, use the `offset` modifier, as well as', 'the `padding` option in the `preventOverflow` and `flip`', 'modifiers.'].join(' '));
+            }
+          }
+
+          runModifierEffects();
+          return instance.update();
+        },
+        // Sync update – it will always be executed, even if not necessary. This
+        // is useful for low frequency updates where sync behavior simplifies the
+        // logic.
+        // For high frequency updates (e.g. `resize` and `scroll` events), always
+        // prefer the async Popper#update method
+        forceUpdate: function forceUpdate() {
+          if (isDestroyed) {
+            return;
+          }
+
+          var _state$elements = state.elements,
+              reference = _state$elements.reference,
+              popper = _state$elements.popper; // Don't proceed if `reference` or `popper` are not valid elements
+          // anymore
+
+          if (!areValidElements(reference, popper)) {
+            {
+              console.error(INVALID_ELEMENT_ERROR);
+            }
+
+            return;
+          } // Store the reference and popper rects to be read by modifiers
+
+
+          state.rects = {
+            reference: getCompositeRect(reference, getOffsetParent(popper), state.options.strategy === 'fixed'),
+            popper: getLayoutRect(popper)
+          }; // Modifiers have the ability to reset the current update cycle. The
+          // most common use case for this is the `flip` modifier changing the
+          // placement, which then needs to re-run all the modifiers, because the
+          // logic was previously ran for the previous placement and is therefore
+          // stale/incorrect
+
+          state.reset = false;
+          state.placement = state.options.placement; // On each update cycle, the `modifiersData` property for each modifier
+          // is filled with the initial data specified by the modifier. This means
+          // it doesn't persist and is fresh on each update.
+          // To ensure persistent data, use `${name}#persistent`
+
+          state.orderedModifiers.forEach(function (modifier) {
+            return state.modifiersData[modifier.name] = Object.assign({}, modifier.data);
+          });
+          var __debug_loops__ = 0;
+
+          for (var index = 0; index < state.orderedModifiers.length; index++) {
+            {
+              __debug_loops__ += 1;
+
+              if (__debug_loops__ > 100) {
+                console.error(INFINITE_LOOP_ERROR);
+                break;
+              }
+            }
+
+            if (state.reset === true) {
+              state.reset = false;
+              index = -1;
+              continue;
+            }
+
+            var _state$orderedModifie = state.orderedModifiers[index],
+                fn = _state$orderedModifie.fn,
+                _state$orderedModifie2 = _state$orderedModifie.options,
+                _options = _state$orderedModifie2 === void 0 ? {} : _state$orderedModifie2,
+                name = _state$orderedModifie.name;
+
+            if (typeof fn === 'function') {
+              state = fn({
+                state: state,
+                options: _options,
+                name: name,
+                instance: instance
+              }) || state;
+            }
+          }
+        },
+        // Async and optimistically optimized update – it will not be executed if
+        // not necessary (debounced to run at most once-per-tick)
+        update: debounce(function () {
+          return new Promise(function (resolve) {
+            instance.forceUpdate();
+            resolve(state);
+          });
+        }),
+        destroy: function destroy() {
+          cleanupModifierEffects();
+          isDestroyed = true;
+        }
+      };
+
+      if (!areValidElements(reference, popper)) {
+        {
+          console.error(INVALID_ELEMENT_ERROR);
+        }
+
+        return instance;
+      }
+
+      instance.setOptions(options).then(function (state) {
+        if (!isDestroyed && options.onFirstUpdate) {
+          options.onFirstUpdate(state);
+        }
+      }); // Modifiers have the ability to execute arbitrary code before the first
+      // update cycle runs. They will be executed in the same order as the update
+      // cycle. This is useful when a modifier adds some persistent data that
+      // other modifiers need to use, but the modifier is run after the dependent
+      // one.
+
+      function runModifierEffects() {
+        state.orderedModifiers.forEach(function (_ref3) {
+          var name = _ref3.name,
+              _ref3$options = _ref3.options,
+              options = _ref3$options === void 0 ? {} : _ref3$options,
+              effect = _ref3.effect;
+
+          if (typeof effect === 'function') {
+            var cleanupFn = effect({
+              state: state,
+              name: name,
+              instance: instance,
+              options: options
+            });
+
+            var noopFn = function noopFn() {};
+
+            effectCleanupFns.push(cleanupFn || noopFn);
+          }
+        });
+      }
+
+      function cleanupModifierEffects() {
+        effectCleanupFns.forEach(function (fn) {
+          return fn();
+        });
+        effectCleanupFns = [];
+      }
+
+      return instance;
+    };
+  }
+
+  var passive = {
+    passive: true
+  };
+
+  function effect(_ref) {
+    var state = _ref.state,
+        instance = _ref.instance,
+        options = _ref.options;
+    var _options$scroll = options.scroll,
+        scroll = _options$scroll === void 0 ? true : _options$scroll,
+        _options$resize = options.resize,
+        resize = _options$resize === void 0 ? true : _options$resize;
+    var window = getWindow(state.elements.popper);
+    var scrollParents = [].concat(state.scrollParents.reference, state.scrollParents.popper);
+
+    if (scroll) {
+      scrollParents.forEach(function (scrollParent) {
+        scrollParent.addEventListener('scroll', instance.update, passive);
+      });
+    }
+
+    if (resize) {
+      window.addEventListener('resize', instance.update, passive);
+    }
+
+    return function () {
+      if (scroll) {
+        scrollParents.forEach(function (scrollParent) {
+          scrollParent.removeEventListener('scroll', instance.update, passive);
+        });
+      }
+
+      if (resize) {
+        window.removeEventListener('resize', instance.update, passive);
+      }
+    };
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var eventListeners = {
+    name: 'eventListeners',
+    enabled: true,
+    phase: 'write',
+    fn: function fn() {},
+    effect: effect,
+    data: {}
+  };
+
+  function popperOffsets(_ref) {
+    var state = _ref.state,
+        name = _ref.name;
+    // Offsets are the actual position the popper needs to have to be
+    // properly positioned near its reference element
+    // This is the most basic placement, and will be adjusted by
+    // the modifiers in the next step
+    state.modifiersData[name] = computeOffsets({
+      reference: state.rects.reference,
+      element: state.rects.popper,
+      strategy: 'absolute',
+      placement: state.placement
+    });
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var popperOffsets$1 = {
+    name: 'popperOffsets',
+    enabled: true,
+    phase: 'read',
+    fn: popperOffsets,
+    data: {}
+  };
+
+  var unsetSides = {
+    top: 'auto',
+    right: 'auto',
+    bottom: 'auto',
+    left: 'auto'
+  }; // Round the offsets to the nearest suitable subpixel based on the DPR.
+  // Zooming can change the DPR, but it seems to report a value that will
+  // cleanly divide the values into the appropriate subpixels.
+
+  function roundOffsets(_ref) {
+    var x = _ref.x,
+        y = _ref.y;
+    var win = window;
+    var dpr = win.devicePixelRatio || 1;
+    return {
+      x: Math.round(x * dpr) / dpr || 0,
+      y: Math.round(y * dpr) / dpr || 0
+    };
+  }
+
+  function mapToStyles(_ref2) {
+    var _Object$assign2;
+
+    var popper = _ref2.popper,
+        popperRect = _ref2.popperRect,
+        placement = _ref2.placement,
+        offsets = _ref2.offsets,
+        position = _ref2.position,
+        gpuAcceleration = _ref2.gpuAcceleration,
+        adaptive = _ref2.adaptive;
+
+    var _roundOffsets = roundOffsets(offsets),
+        x = _roundOffsets.x,
+        y = _roundOffsets.y;
+
+    var hasX = offsets.hasOwnProperty('x');
+    var hasY = offsets.hasOwnProperty('y');
+    var sideX = left;
+    var sideY = top;
+    var win = window;
+
+    if (adaptive) {
+      var offsetParent = getOffsetParent(popper);
+
+      if (offsetParent === getWindow(popper)) {
+        offsetParent = getDocumentElement(popper);
+      } // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it
+
+      /*:: offsetParent = (offsetParent: Element); */
+
+
+      if (placement === top) {
+        sideY = bottom;
+        y -= offsetParent.clientHeight - popperRect.height;
+        y *= gpuAcceleration ? 1 : -1;
+      }
+
+      if (placement === left) {
+        sideX = right;
+        x -= offsetParent.clientWidth - popperRect.width;
+        x *= gpuAcceleration ? 1 : -1;
+      }
+    }
+
+    var commonStyles = Object.assign({
+      position: position
+    }, adaptive && unsetSides);
+
+    if (gpuAcceleration) {
+      var _Object$assign;
+
+      return Object.assign(Object.assign({}, commonStyles), {}, (_Object$assign = {}, _Object$assign[sideY] = hasY ? '0' : '', _Object$assign[sideX] = hasX ? '0' : '', _Object$assign.transform = (win.devicePixelRatio || 1) < 2 ? "translate(" + x + "px, " + y + "px)" : "translate3d(" + x + "px, " + y + "px, 0)", _Object$assign));
+    }
+
+    return Object.assign(Object.assign({}, commonStyles), {}, (_Object$assign2 = {}, _Object$assign2[sideY] = hasY ? y + "px" : '', _Object$assign2[sideX] = hasX ? x + "px" : '', _Object$assign2.transform = '', _Object$assign2));
+  }
+
+  function computeStyles(_ref3) {
+    var state = _ref3.state,
+        options = _ref3.options;
+    var _options$gpuAccelerat = options.gpuAcceleration,
+        gpuAcceleration = _options$gpuAccelerat === void 0 ? true : _options$gpuAccelerat,
+        _options$adaptive = options.adaptive,
+        adaptive = _options$adaptive === void 0 ? true : _options$adaptive;
+
+    {
+      var transitionProperty = getComputedStyle(state.elements.popper).transitionProperty || '';
+
+      if (adaptive && ['transform', 'top', 'right', 'bottom', 'left'].some(function (property) {
+        return transitionProperty.indexOf(property) >= 0;
+      })) {
+        console.warn(['Popper: Detected CSS transitions on at least one of the following', 'CSS properties: "transform", "top", "right", "bottom", "left".', '\n\n', 'Disable the "computeStyles" modifier\'s `adaptive` option to allow', 'for smooth transitions, or remove these properties from the CSS', 'transition declaration on the popper element if only transitioning', 'opacity or background-color for example.', '\n\n', 'We recommend using the popper element as a wrapper around an inner', 'element that can have any CSS property transitioned for animations.'].join(' '));
+      }
+    }
+
+    var commonStyles = {
+      placement: getBasePlacement(state.placement),
+      popper: state.elements.popper,
+      popperRect: state.rects.popper,
+      gpuAcceleration: gpuAcceleration
+    };
+
+    if (state.modifiersData.popperOffsets != null) {
+      state.styles.popper = Object.assign(Object.assign({}, state.styles.popper), mapToStyles(Object.assign(Object.assign({}, commonStyles), {}, {
+        offsets: state.modifiersData.popperOffsets,
+        position: state.options.strategy,
+        adaptive: adaptive
+      })));
+    }
+
+    if (state.modifiersData.arrow != null) {
+      state.styles.arrow = Object.assign(Object.assign({}, state.styles.arrow), mapToStyles(Object.assign(Object.assign({}, commonStyles), {}, {
+        offsets: state.modifiersData.arrow,
+        position: 'absolute',
+        adaptive: false
+      })));
+    }
+
+    state.attributes.popper = Object.assign(Object.assign({}, state.attributes.popper), {}, {
+      'data-popper-placement': state.placement
+    });
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var computeStyles$1 = {
+    name: 'computeStyles',
+    enabled: true,
+    phase: 'beforeWrite',
+    fn: computeStyles,
+    data: {}
+  };
+
+  // and applies them to the HTMLElements such as popper and arrow
+
+  function applyStyles(_ref) {
+    var state = _ref.state;
+    Object.keys(state.elements).forEach(function (name) {
+      var style = state.styles[name] || {};
+      var attributes = state.attributes[name] || {};
+      var element = state.elements[name]; // arrow is optional + virtual elements
+
+      if (!isHTMLElement(element) || !getNodeName(element)) {
+        return;
+      } // Flow doesn't support to extend this property, but it's the most
+      // effective way to apply styles to an HTMLElement
+      // $FlowFixMe
+
+
+      Object.assign(element.style, style);
+      Object.keys(attributes).forEach(function (name) {
+        var value = attributes[name];
+
+        if (value === false) {
+          element.removeAttribute(name);
+        } else {
+          element.setAttribute(name, value === true ? '' : value);
+        }
+      });
+    });
+  }
+
+  function effect$1(_ref2) {
+    var state = _ref2.state;
+    var initialStyles = {
+      popper: {
+        position: state.options.strategy,
+        left: '0',
+        top: '0',
+        margin: '0'
+      },
+      arrow: {
+        position: 'absolute'
+      },
+      reference: {}
+    };
+    Object.assign(state.elements.popper.style, initialStyles.popper);
+
+    if (state.elements.arrow) {
+      Object.assign(state.elements.arrow.style, initialStyles.arrow);
+    }
+
+    return function () {
+      Object.keys(state.elements).forEach(function (name) {
+        var element = state.elements[name];
+        var attributes = state.attributes[name] || {};
+        var styleProperties = Object.keys(state.styles.hasOwnProperty(name) ? state.styles[name] : initialStyles[name]); // Set all values to an empty string to unset them
+
+        var style = styleProperties.reduce(function (style, property) {
+          style[property] = '';
+          return style;
+        }, {}); // arrow is optional + virtual elements
+
+        if (!isHTMLElement(element) || !getNodeName(element)) {
+          return;
+        } // Flow doesn't support to extend this property, but it's the most
+        // effective way to apply styles to an HTMLElement
+        // $FlowFixMe
+
+
+        Object.assign(element.style, style);
+        Object.keys(attributes).forEach(function (attribute) {
+          element.removeAttribute(attribute);
+        });
+      });
+    };
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var applyStyles$1 = {
+    name: 'applyStyles',
+    enabled: true,
+    phase: 'write',
+    fn: applyStyles,
+    effect: effect$1,
+    requires: ['computeStyles']
+  };
+
+  function distanceAndSkiddingToXY(placement, rects, offset) {
+    var basePlacement = getBasePlacement(placement);
+    var invertDistance = [left, top].indexOf(basePlacement) >= 0 ? -1 : 1;
+
+    var _ref = typeof offset === 'function' ? offset(Object.assign(Object.assign({}, rects), {}, {
+      placement: placement
+    })) : offset,
+        skidding = _ref[0],
+        distance = _ref[1];
+
+    skidding = skidding || 0;
+    distance = (distance || 0) * invertDistance;
+    return [left, right].indexOf(basePlacement) >= 0 ? {
+      x: distance,
+      y: skidding
+    } : {
+      x: skidding,
+      y: distance
+    };
+  }
+
+  function offset(_ref2) {
+    var state = _ref2.state,
+        options = _ref2.options,
+        name = _ref2.name;
+    var _options$offset = options.offset,
+        offset = _options$offset === void 0 ? [0, 0] : _options$offset;
+    var data = placements.reduce(function (acc, placement) {
+      acc[placement] = distanceAndSkiddingToXY(placement, state.rects, offset);
+      return acc;
+    }, {});
+    var _data$state$placement = data[state.placement],
+        x = _data$state$placement.x,
+        y = _data$state$placement.y;
+
+    if (state.modifiersData.popperOffsets != null) {
+      state.modifiersData.popperOffsets.x += x;
+      state.modifiersData.popperOffsets.y += y;
+    }
+
+    state.modifiersData[name] = data;
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var offset$1 = {
+    name: 'offset',
+    enabled: true,
+    phase: 'main',
+    requires: ['popperOffsets'],
+    fn: offset
+  };
+
+  var hash = {
+    left: 'right',
+    right: 'left',
+    bottom: 'top',
+    top: 'bottom'
+  };
+  function getOppositePlacement(placement) {
+    return placement.replace(/left|right|bottom|top/g, function (matched) {
+      return hash[matched];
+    });
+  }
+
+  var hash$1 = {
+    start: 'end',
+    end: 'start'
+  };
+  function getOppositeVariationPlacement(placement) {
+    return placement.replace(/start|end/g, function (matched) {
+      return hash$1[matched];
+    });
+  }
+
+  /*:: type OverflowsMap = { [ComputedPlacement]: number }; */
+
+  /*;; type OverflowsMap = { [key in ComputedPlacement]: number }; */
+  function computeAutoPlacement(state, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    var _options = options,
+        placement = _options.placement,
+        boundary = _options.boundary,
+        rootBoundary = _options.rootBoundary,
+        padding = _options.padding,
+        flipVariations = _options.flipVariations,
+        _options$allowedAutoP = _options.allowedAutoPlacements,
+        allowedAutoPlacements = _options$allowedAutoP === void 0 ? placements : _options$allowedAutoP;
+    var variation = getVariation(placement);
+    var placements$1 = variation ? flipVariations ? variationPlacements : variationPlacements.filter(function (placement) {
+      return getVariation(placement) === variation;
+    }) : basePlacements; // $FlowFixMe
+
+    var allowedPlacements = placements$1.filter(function (placement) {
+      return allowedAutoPlacements.indexOf(placement) >= 0;
+    });
+
+    if (allowedPlacements.length === 0) {
+      allowedPlacements = placements$1;
+
+      {
+        console.error(['Popper: The `allowedAutoPlacements` option did not allow any', 'placements. Ensure the `placement` option matches the variation', 'of the allowed placements.', 'For example, "auto" cannot be used to allow "bottom-start".', 'Use "auto-start" instead.'].join(' '));
+      }
+    } // $FlowFixMe: Flow seems to have problems with two array unions...
+
+
+    var overflows = allowedPlacements.reduce(function (acc, placement) {
+      acc[placement] = detectOverflow(state, {
+        placement: placement,
+        boundary: boundary,
+        rootBoundary: rootBoundary,
+        padding: padding
+      })[getBasePlacement(placement)];
+      return acc;
+    }, {});
+    return Object.keys(overflows).sort(function (a, b) {
+      return overflows[a] - overflows[b];
+    });
+  }
+
+  function getExpandedFallbackPlacements(placement) {
+    if (getBasePlacement(placement) === auto) {
+      return [];
+    }
+
+    var oppositePlacement = getOppositePlacement(placement);
+    return [getOppositeVariationPlacement(placement), oppositePlacement, getOppositeVariationPlacement(oppositePlacement)];
+  }
+
+  function flip(_ref) {
+    var state = _ref.state,
+        options = _ref.options,
+        name = _ref.name;
+
+    if (state.modifiersData[name]._skip) {
+      return;
+    }
+
+    var _options$mainAxis = options.mainAxis,
+        checkMainAxis = _options$mainAxis === void 0 ? true : _options$mainAxis,
+        _options$altAxis = options.altAxis,
+        checkAltAxis = _options$altAxis === void 0 ? true : _options$altAxis,
+        specifiedFallbackPlacements = options.fallbackPlacements,
+        padding = options.padding,
+        boundary = options.boundary,
+        rootBoundary = options.rootBoundary,
+        altBoundary = options.altBoundary,
+        _options$flipVariatio = options.flipVariations,
+        flipVariations = _options$flipVariatio === void 0 ? true : _options$flipVariatio,
+        allowedAutoPlacements = options.allowedAutoPlacements;
+    var preferredPlacement = state.options.placement;
+    var basePlacement = getBasePlacement(preferredPlacement);
+    var isBasePlacement = basePlacement === preferredPlacement;
+    var fallbackPlacements = specifiedFallbackPlacements || (isBasePlacement || !flipVariations ? [getOppositePlacement(preferredPlacement)] : getExpandedFallbackPlacements(preferredPlacement));
+    var placements = [preferredPlacement].concat(fallbackPlacements).reduce(function (acc, placement) {
+      return acc.concat(getBasePlacement(placement) === auto ? computeAutoPlacement(state, {
+        placement: placement,
+        boundary: boundary,
+        rootBoundary: rootBoundary,
+        padding: padding,
+        flipVariations: flipVariations,
+        allowedAutoPlacements: allowedAutoPlacements
+      }) : placement);
+    }, []);
+    var referenceRect = state.rects.reference;
+    var popperRect = state.rects.popper;
+    var checksMap = new Map();
+    var makeFallbackChecks = true;
+    var firstFittingPlacement = placements[0];
+
+    for (var i = 0; i < placements.length; i++) {
+      var placement = placements[i];
+
+      var _basePlacement = getBasePlacement(placement);
+
+      var isStartVariation = getVariation(placement) === start;
+      var isVertical = [top, bottom].indexOf(_basePlacement) >= 0;
+      var len = isVertical ? 'width' : 'height';
+      var overflow = detectOverflow(state, {
+        placement: placement,
+        boundary: boundary,
+        rootBoundary: rootBoundary,
+        altBoundary: altBoundary,
+        padding: padding
+      });
+      var mainVariationSide = isVertical ? isStartVariation ? right : left : isStartVariation ? bottom : top;
+
+      if (referenceRect[len] > popperRect[len]) {
+        mainVariationSide = getOppositePlacement(mainVariationSide);
+      }
+
+      var altVariationSide = getOppositePlacement(mainVariationSide);
+      var checks = [];
+
+      if (checkMainAxis) {
+        checks.push(overflow[_basePlacement] <= 0);
+      }
+
+      if (checkAltAxis) {
+        checks.push(overflow[mainVariationSide] <= 0, overflow[altVariationSide] <= 0);
+      }
+
+      if (checks.every(function (check) {
+        return check;
+      })) {
+        firstFittingPlacement = placement;
+        makeFallbackChecks = false;
+        break;
+      }
+
+      checksMap.set(placement, checks);
+    }
+
+    if (makeFallbackChecks) {
+      // `2` may be desired in some cases – research later
+      var numberOfChecks = flipVariations ? 3 : 1;
+
+      var _loop = function _loop(_i) {
+        var fittingPlacement = placements.find(function (placement) {
+          var checks = checksMap.get(placement);
+
+          if (checks) {
+            return checks.slice(0, _i).every(function (check) {
+              return check;
+            });
+          }
+        });
+
+        if (fittingPlacement) {
+          firstFittingPlacement = fittingPlacement;
+          return "break";
+        }
+      };
+
+      for (var _i = numberOfChecks; _i > 0; _i--) {
+        var _ret = _loop(_i);
+
+        if (_ret === "break") break;
+      }
+    }
+
+    if (state.placement !== firstFittingPlacement) {
+      state.modifiersData[name]._skip = true;
+      state.placement = firstFittingPlacement;
+      state.reset = true;
+    }
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var flip$1 = {
+    name: 'flip',
+    enabled: true,
+    phase: 'main',
+    fn: flip,
+    requiresIfExists: ['offset'],
+    data: {
+      _skip: false
+    }
+  };
+
+  function getAltAxis(axis) {
+    return axis === 'x' ? 'y' : 'x';
+  }
+
+  function within(min, value, max) {
+    return Math.max(min, Math.min(value, max));
+  }
+
+  function preventOverflow(_ref) {
+    var state = _ref.state,
+        options = _ref.options,
+        name = _ref.name;
+    var _options$mainAxis = options.mainAxis,
+        checkMainAxis = _options$mainAxis === void 0 ? true : _options$mainAxis,
+        _options$altAxis = options.altAxis,
+        checkAltAxis = _options$altAxis === void 0 ? false : _options$altAxis,
+        boundary = options.boundary,
+        rootBoundary = options.rootBoundary,
+        altBoundary = options.altBoundary,
+        padding = options.padding,
+        _options$tether = options.tether,
+        tether = _options$tether === void 0 ? true : _options$tether,
+        _options$tetherOffset = options.tetherOffset,
+        tetherOffset = _options$tetherOffset === void 0 ? 0 : _options$tetherOffset;
+    var overflow = detectOverflow(state, {
+      boundary: boundary,
+      rootBoundary: rootBoundary,
+      padding: padding,
+      altBoundary: altBoundary
+    });
+    var basePlacement = getBasePlacement(state.placement);
+    var variation = getVariation(state.placement);
+    var isBasePlacement = !variation;
+    var mainAxis = getMainAxisFromPlacement(basePlacement);
+    var altAxis = getAltAxis(mainAxis);
+    var popperOffsets = state.modifiersData.popperOffsets;
+    var referenceRect = state.rects.reference;
+    var popperRect = state.rects.popper;
+    var tetherOffsetValue = typeof tetherOffset === 'function' ? tetherOffset(Object.assign(Object.assign({}, state.rects), {}, {
+      placement: state.placement
+    })) : tetherOffset;
+    var data = {
+      x: 0,
+      y: 0
+    };
+
+    if (!popperOffsets) {
+      return;
+    }
+
+    if (checkMainAxis) {
+      var mainSide = mainAxis === 'y' ? top : left;
+      var altSide = mainAxis === 'y' ? bottom : right;
+      var len = mainAxis === 'y' ? 'height' : 'width';
+      var offset = popperOffsets[mainAxis];
+      var min = popperOffsets[mainAxis] + overflow[mainSide];
+      var max = popperOffsets[mainAxis] - overflow[altSide];
+      var additive = tether ? -popperRect[len] / 2 : 0;
+      var minLen = variation === start ? referenceRect[len] : popperRect[len];
+      var maxLen = variation === start ? -popperRect[len] : -referenceRect[len]; // We need to include the arrow in the calculation so the arrow doesn't go
+      // outside the reference bounds
+
+      var arrowElement = state.elements.arrow;
+      var arrowRect = tether && arrowElement ? getLayoutRect(arrowElement) : {
+        width: 0,
+        height: 0
+      };
+      var arrowPaddingObject = state.modifiersData['arrow#persistent'] ? state.modifiersData['arrow#persistent'].padding : getFreshSideObject();
+      var arrowPaddingMin = arrowPaddingObject[mainSide];
+      var arrowPaddingMax = arrowPaddingObject[altSide]; // If the reference length is smaller than the arrow length, we don't want
+      // to include its full size in the calculation. If the reference is small
+      // and near the edge of a boundary, the popper can overflow even if the
+      // reference is not overflowing as well (e.g. virtual elements with no
+      // width or height)
+
+      var arrowLen = within(0, referenceRect[len], arrowRect[len]);
+      var minOffset = isBasePlacement ? referenceRect[len] / 2 - additive - arrowLen - arrowPaddingMin - tetherOffsetValue : minLen - arrowLen - arrowPaddingMin - tetherOffsetValue;
+      var maxOffset = isBasePlacement ? -referenceRect[len] / 2 + additive + arrowLen + arrowPaddingMax + tetherOffsetValue : maxLen + arrowLen + arrowPaddingMax + tetherOffsetValue;
+      var arrowOffsetParent = state.elements.arrow && getOffsetParent(state.elements.arrow);
+      var clientOffset = arrowOffsetParent ? mainAxis === 'y' ? arrowOffsetParent.clientTop || 0 : arrowOffsetParent.clientLeft || 0 : 0;
+      var offsetModifierValue = state.modifiersData.offset ? state.modifiersData.offset[state.placement][mainAxis] : 0;
+      var tetherMin = popperOffsets[mainAxis] + minOffset - offsetModifierValue - clientOffset;
+      var tetherMax = popperOffsets[mainAxis] + maxOffset - offsetModifierValue;
+      var preventedOffset = within(tether ? Math.min(min, tetherMin) : min, offset, tether ? Math.max(max, tetherMax) : max);
+      popperOffsets[mainAxis] = preventedOffset;
+      data[mainAxis] = preventedOffset - offset;
+    }
+
+    if (checkAltAxis) {
+      var _mainSide = mainAxis === 'x' ? top : left;
+
+      var _altSide = mainAxis === 'x' ? bottom : right;
+
+      var _offset = popperOffsets[altAxis];
+
+      var _min = _offset + overflow[_mainSide];
+
+      var _max = _offset - overflow[_altSide];
+
+      var _preventedOffset = within(_min, _offset, _max);
+
+      popperOffsets[altAxis] = _preventedOffset;
+      data[altAxis] = _preventedOffset - _offset;
+    }
+
+    state.modifiersData[name] = data;
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var preventOverflow$1 = {
+    name: 'preventOverflow',
+    enabled: true,
+    phase: 'main',
+    fn: preventOverflow,
+    requiresIfExists: ['offset']
+  };
+
+  function arrow(_ref) {
+    var _state$modifiersData$;
+
+    var state = _ref.state,
+        name = _ref.name;
+    var arrowElement = state.elements.arrow;
+    var popperOffsets = state.modifiersData.popperOffsets;
+    var basePlacement = getBasePlacement(state.placement);
+    var axis = getMainAxisFromPlacement(basePlacement);
+    var isVertical = [left, right].indexOf(basePlacement) >= 0;
+    var len = isVertical ? 'height' : 'width';
+
+    if (!arrowElement || !popperOffsets) {
+      return;
+    }
+
+    var paddingObject = state.modifiersData[name + "#persistent"].padding;
+    var arrowRect = getLayoutRect(arrowElement);
+    var minProp = axis === 'y' ? top : left;
+    var maxProp = axis === 'y' ? bottom : right;
+    var endDiff = state.rects.reference[len] + state.rects.reference[axis] - popperOffsets[axis] - state.rects.popper[len];
+    var startDiff = popperOffsets[axis] - state.rects.reference[axis];
+    var arrowOffsetParent = getOffsetParent(arrowElement);
+    var clientSize = arrowOffsetParent ? axis === 'y' ? arrowOffsetParent.clientHeight || 0 : arrowOffsetParent.clientWidth || 0 : 0;
+    var centerToReference = endDiff / 2 - startDiff / 2; // Make sure the arrow doesn't overflow the popper if the center point is
+    // outside of the popper bounds
+
+    var min = paddingObject[minProp];
+    var max = clientSize - arrowRect[len] - paddingObject[maxProp];
+    var center = clientSize / 2 - arrowRect[len] / 2 + centerToReference;
+    var offset = within(min, center, max); // Prevents breaking syntax highlighting...
+
+    var axisProp = axis;
+    state.modifiersData[name] = (_state$modifiersData$ = {}, _state$modifiersData$[axisProp] = offset, _state$modifiersData$.centerOffset = offset - center, _state$modifiersData$);
+  }
+
+  function effect$2(_ref2) {
+    var state = _ref2.state,
+        options = _ref2.options,
+        name = _ref2.name;
+    var _options$element = options.element,
+        arrowElement = _options$element === void 0 ? '[data-popper-arrow]' : _options$element,
+        _options$padding = options.padding,
+        padding = _options$padding === void 0 ? 0 : _options$padding;
+
+    if (arrowElement == null) {
+      return;
+    } // CSS selector
+
+
+    if (typeof arrowElement === 'string') {
+      arrowElement = state.elements.popper.querySelector(arrowElement);
+
+      if (!arrowElement) {
+        return;
+      }
+    }
+
+    {
+      if (!isHTMLElement(arrowElement)) {
+        console.error(['Popper: "arrow" element must be an HTMLElement (not an SVGElement).', 'To use an SVG arrow, wrap it in an HTMLElement that will be used as', 'the arrow.'].join(' '));
+      }
+    }
+
+    if (!contains(state.elements.popper, arrowElement)) {
+      {
+        console.error(['Popper: "arrow" modifier\'s `element` must be a child of the popper', 'element.'].join(' '));
+      }
+
+      return;
+    }
+
+    state.elements.arrow = arrowElement;
+    state.modifiersData[name + "#persistent"] = {
+      padding: mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements))
+    };
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var arrow$1 = {
+    name: 'arrow',
+    enabled: true,
+    phase: 'main',
+    fn: arrow,
+    effect: effect$2,
+    requires: ['popperOffsets'],
+    requiresIfExists: ['preventOverflow']
+  };
+
+  function getSideOffsets(overflow, rect, preventedOffsets) {
+    if (preventedOffsets === void 0) {
+      preventedOffsets = {
+        x: 0,
+        y: 0
+      };
+    }
+
+    return {
+      top: overflow.top - rect.height - preventedOffsets.y,
+      right: overflow.right - rect.width + preventedOffsets.x,
+      bottom: overflow.bottom - rect.height + preventedOffsets.y,
+      left: overflow.left - rect.width - preventedOffsets.x
+    };
+  }
+
+  function isAnySideFullyClipped(overflow) {
+    return [top, right, bottom, left].some(function (side) {
+      return overflow[side] >= 0;
+    });
+  }
+
+  function hide(_ref) {
+    var state = _ref.state,
+        name = _ref.name;
+    var referenceRect = state.rects.reference;
+    var popperRect = state.rects.popper;
+    var preventedOffsets = state.modifiersData.preventOverflow;
+    var referenceOverflow = detectOverflow(state, {
+      elementContext: 'reference'
+    });
+    var popperAltOverflow = detectOverflow(state, {
+      altBoundary: true
+    });
+    var referenceClippingOffsets = getSideOffsets(referenceOverflow, referenceRect);
+    var popperEscapeOffsets = getSideOffsets(popperAltOverflow, popperRect, preventedOffsets);
+    var isReferenceHidden = isAnySideFullyClipped(referenceClippingOffsets);
+    var hasPopperEscaped = isAnySideFullyClipped(popperEscapeOffsets);
+    state.modifiersData[name] = {
+      referenceClippingOffsets: referenceClippingOffsets,
+      popperEscapeOffsets: popperEscapeOffsets,
+      isReferenceHidden: isReferenceHidden,
+      hasPopperEscaped: hasPopperEscaped
+    };
+    state.attributes.popper = Object.assign(Object.assign({}, state.attributes.popper), {}, {
+      'data-popper-reference-hidden': isReferenceHidden,
+      'data-popper-escaped': hasPopperEscaped
+    });
+  } // eslint-disable-next-line import/no-unused-modules
+
+
+  var hide$1 = {
+    name: 'hide',
+    enabled: true,
+    phase: 'main',
+    requiresIfExists: ['preventOverflow'],
+    fn: hide
+  };
+
+  var defaultModifiers = [eventListeners, popperOffsets$1, computeStyles$1, applyStyles$1];
+  var createPopper = /*#__PURE__*/popperGenerator({
+    defaultModifiers: defaultModifiers
+  }); // eslint-disable-next-line import/no-unused-modules
+
+  var defaultModifiers$1 = [eventListeners, popperOffsets$1, computeStyles$1, applyStyles$1, offset$1, flip$1, preventOverflow$1, arrow$1, hide$1];
+  var createPopper$1 = /*#__PURE__*/popperGenerator({
+    defaultModifiers: defaultModifiers$1
+  }); // eslint-disable-next-line import/no-unused-modules
+
+  exports.applyStyles = applyStyles$1;
+  exports.arrow = arrow$1;
+  exports.computeStyles = computeStyles$1;
+  exports.createPopper = createPopper$1;
+  exports.createPopperLite = createPopper;
+  exports.defaultModifiers = defaultModifiers$1;
+  exports.detectOverflow = detectOverflow;
+  exports.eventListeners = eventListeners;
+  exports.flip = flip$1;
+  exports.hide = hide$1;
+  exports.offset = offset$1;
+  exports.popperGenerator = popperGenerator;
+  exports.popperOffsets = popperOffsets$1;
+  exports.preventOverflow = preventOverflow$1;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=popper.js.map
diff --git a/web-tools/web/_static/popperjs/popper.js.map b/web-tools/web/_static/popperjs/popper.js.map
new file mode 100644
index 0000000..8f75912
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getLayoutRect.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/isTableElement.js","../../src/dom-utils/getOffsetParent.js","../../src/enums.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/format.js","../../src/utils/validateModifiers.js","../../src/utils/uniqueBy.js","../../src/utils/getBasePlacement.js","../../src/utils/mergeByName.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/dom-utils/contains.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/utils/getVariation.js","../../src/utils/getMainAxisFromPlacement.js","../../src/utils/computeOffsets.js","../../src/utils/getFreshSideObject.js","../../src/utils/mergePaddingObject.js","../../src/utils/expandToHashMap.js","../../src/utils/detectOverflow.js","../../src/createPopper.js","../../src/modifiers/eventListeners.js","../../src/modifiers/popperOffsets.js","../../src/modifiers/computeStyles.js","../../src/modifiers/applyStyles.js","../../src/modifiers/offset.js","../../src/utils/getOppositePlacement.js","../../src/utils/getOppositeVariationPlacement.js","../../src/utils/computeAutoPlacement.js","../../src/modifiers/flip.js","../../src/utils/getAltAxis.js","../../src/utils/within.js","../../src/modifiers/preventOverflow.js","../../src/modifiers/arrow.js","../../src/modifiers/hide.js","../../src/popper-lite.js","../../src/popper.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\n\nexport default function format(str: string, ...args: Array<string>) {\n  return [...args].reduce((p, c) => p.replace(/%s/, c), str);\n}\n","// @flow\nimport format from './format';\nimport { modifierPhases } from '../enums';\n\nconst INVALID_MODIFIER_ERROR =\n  'Popper: modifier \"%s\" provided an invalid %s property, expected %s but got %s';\nconst MISSING_DEPENDENCY_ERROR =\n  'Popper: modifier \"%s\" requires \"%s\", but \"%s\" modifier is not available';\nconst VALID_PROPERTIES = [\n  'name',\n  'enabled',\n  'phase',\n  'fn',\n  'effect',\n  'requires',\n  'options',\n];\n\nexport default function validateModifiers(modifiers: Array<any>): void {\n  modifiers.forEach(modifier => {\n    Object.keys(modifier).forEach(key => {\n      switch (key) {\n        case 'name':\n          if (typeof modifier.name !== 'string') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                String(modifier.name),\n                '\"name\"',\n                '\"string\"',\n                `\"${String(modifier.name)}\"`\n              )\n            );\n          }\n          break;\n        case 'enabled':\n          if (typeof modifier.enabled !== 'boolean') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"enabled\"',\n                '\"boolean\"',\n                `\"${String(modifier.enabled)}\"`\n              )\n            );\n          }\n        case 'phase':\n          if (modifierPhases.indexOf(modifier.phase) < 0) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"phase\"',\n                `either ${modifierPhases.join(', ')}`,\n                `\"${String(modifier.phase)}\"`\n              )\n            );\n          }\n          break;\n        case 'fn':\n          if (typeof modifier.fn !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"fn\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'effect':\n          if (typeof modifier.effect !== 'function') {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"effect\"',\n                '\"function\"',\n                `\"${String(modifier.fn)}\"`\n              )\n            );\n          }\n          break;\n        case 'requires':\n          if (!Array.isArray(modifier.requires)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requires\"',\n                '\"array\"',\n                `\"${String(modifier.requires)}\"`\n              )\n            );\n          }\n          break;\n        case 'requiresIfExists':\n          if (!Array.isArray(modifier.requiresIfExists)) {\n            console.error(\n              format(\n                INVALID_MODIFIER_ERROR,\n                modifier.name,\n                '\"requiresIfExists\"',\n                '\"array\"',\n                `\"${String(modifier.requiresIfExists)}\"`\n              )\n            );\n          }\n          break;\n        case 'options':\n        case 'data':\n          break;\n        default:\n          console.error(\n            `PopperJS: an invalid property has been provided to the \"${\n              modifier.name\n            }\" modifier, valid properties are ${VALID_PROPERTIES.map(\n              s => `\"${s}\"`\n            ).join(', ')}; but \"${key}\" was provided.`\n          );\n      }\n\n      modifier.requires &&\n        modifier.requires.forEach(requirement => {\n          if (modifiers.find(mod => mod.name === requirement) == null) {\n            console.error(\n              format(\n                MISSING_DEPENDENCY_ERROR,\n                String(modifier.name),\n                requirement,\n                requirement\n              )\n            );\n          }\n        });\n    });\n  });\n}\n","// @flow\n\nexport default function uniqueBy<T>(arr: Array<T>, fn: T => any): Array<T> {\n  const identifiers = new Set();\n\n  return arr.filter(item => {\n    const identifier = fn(item);\n\n    if (!identifiers.has(identifier)) {\n      identifiers.add(identifier);\n      return true;\n    }\n  });\n}\n","// @flow\nimport { type BasePlacement, type Placement, auto } from '../enums';\n\nexport default function getBasePlacement(\n  placement: Placement | typeof auto\n): BasePlacement {\n  return (placement.split('-')[0]: any);\n}\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nimport { type Variation, type Placement } from '../enums';\n\nexport default function getVariation(placement: Placement): ?Variation {\n  return (placement.split('-')[1]: any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nexport default function getMainAxisFromPlacement(\n  placement: Placement\n): 'x' | 'y' {\n  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';\n}\n","// @flow\nimport getBasePlacement from './getBasePlacement';\nimport getVariation from './getVariation';\nimport getMainAxisFromPlacement from './getMainAxisFromPlacement';\nimport type {\n  Rect,\n  PositioningStrategy,\n  Offsets,\n  ClientRectObject,\n} from '../types';\nimport { top, right, bottom, left, start, end, type Placement } from '../enums';\n\nexport default function computeOffsets({\n  reference,\n  element,\n  placement,\n}: {\n  reference: Rect | ClientRectObject,\n  element: Rect | ClientRectObject,\n  strategy: PositioningStrategy,\n  placement?: Placement,\n}): Offsets {\n  const basePlacement = placement ? getBasePlacement(placement) : null;\n  const variation = placement ? getVariation(placement) : null;\n  const commonX = reference.x + reference.width / 2 - element.width / 2;\n  const commonY = reference.y + reference.height / 2 - element.height / 2;\n\n  let offsets;\n  switch (basePlacement) {\n    case top:\n      offsets = {\n        x: commonX,\n        y: reference.y - element.height,\n      };\n      break;\n    case bottom:\n      offsets = {\n        x: commonX,\n        y: reference.y + reference.height,\n      };\n      break;\n    case right:\n      offsets = {\n        x: reference.x + reference.width,\n        y: commonY,\n      };\n      break;\n    case left:\n      offsets = {\n        x: reference.x - element.width,\n        y: commonY,\n      };\n      break;\n    default:\n      offsets = {\n        x: reference.x,\n        y: reference.y,\n      };\n  }\n\n  const mainAxis = basePlacement\n    ? getMainAxisFromPlacement(basePlacement)\n    : null;\n\n  if (mainAxis != null) {\n    const len = mainAxis === 'y' ? 'height' : 'width';\n\n    switch (variation) {\n      case start:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) -\n          Math.floor(reference[len] / 2 - element[len] / 2);\n        break;\n      case end:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) +\n          Math.ceil(reference[len] / 2 - element[len] / 2);\n        break;\n      default:\n    }\n  }\n\n  return offsets;\n}\n","// @flow\nimport type { SideObject } from '../types';\n\nexport default function getFreshSideObject(): SideObject {\n  return {\n    top: 0,\n    right: 0,\n    bottom: 0,\n    left: 0,\n  };\n}\n","// @flow\nimport type { SideObject } from '../types';\nimport getFreshSideObject from './getFreshSideObject';\n\nexport default function mergePaddingObject(\n  paddingObject: $Shape<SideObject>\n): SideObject {\n  return {\n    ...getFreshSideObject(),\n    ...paddingObject,\n  };\n}\n","// @flow\n\nexport default function expandToHashMap<\n  T: number | string | boolean,\n  K: string\n>(value: T, keys: Array<K>): { [key: string]: T } {\n  return keys.reduce((hashMap, key) => {\n    hashMap[key] = value;\n    return hashMap;\n  }, {});\n}\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';\n      overflowOffsets[key] += offset[axis] * multiply;\n    });\n  }\n\n  return overflowOffsets;\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow };\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport getWindow from '../dom-utils/getWindow';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  scroll: boolean,\n  resize: boolean,\n};\n\nconst passive = { passive: true };\n\nfunction effect({ state, instance, options }: ModifierArguments<Options>) {\n  const { scroll = true, resize = true } = options;\n\n  const window = getWindow(state.elements.popper);\n  const scrollParents = [\n    ...state.scrollParents.reference,\n    ...state.scrollParents.popper,\n  ];\n\n  if (scroll) {\n    scrollParents.forEach(scrollParent => {\n      scrollParent.addEventListener('scroll', instance.update, passive);\n    });\n  }\n\n  if (resize) {\n    window.addEventListener('resize', instance.update, passive);\n  }\n\n  return () => {\n    if (scroll) {\n      scrollParents.forEach(scrollParent => {\n        scrollParent.removeEventListener('scroll', instance.update, passive);\n      });\n    }\n\n    if (resize) {\n      window.removeEventListener('resize', instance.update, passive);\n    }\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type EventListenersModifier = Modifier<'eventListeners', Options>;\nexport default ({\n  name: 'eventListeners',\n  enabled: true,\n  phase: 'write',\n  fn: () => {},\n  effect,\n  data: {},\n}: EventListenersModifier);\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport computeOffsets from '../utils/computeOffsets';\n\nfunction popperOffsets({ state, name }: ModifierArguments<{||}>) {\n  // Offsets are the actual position the popper needs to have to be\n  // properly positioned near its reference element\n  // This is the most basic placement, and will be adjusted by\n  // the modifiers in the next step\n  state.modifiersData[name] = computeOffsets({\n    reference: state.rects.reference,\n    element: state.rects.popper,\n    strategy: 'absolute',\n    placement: state.placement,\n  });\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PopperOffsetsModifier = Modifier<'popperOffsets', {||}>;\nexport default ({\n  name: 'popperOffsets',\n  enabled: true,\n  phase: 'read',\n  fn: popperOffsets,\n  data: {},\n}: PopperOffsetsModifier);\n","// @flow\nimport type {\n  PositioningStrategy,\n  Offsets,\n  Modifier,\n  ModifierArguments,\n  Rect,\n  Window,\n} from '../types';\nimport { type BasePlacement, top, left, right, bottom } from '../enums';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getWindow from '../dom-utils/getWindow';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport getComputedStyle from '../dom-utils/getComputedStyle';\nimport getBasePlacement from '../utils/getBasePlacement';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n};\n\nconst unsetSides = {\n  top: 'auto',\n  right: 'auto',\n  bottom: 'auto',\n  left: 'auto',\n};\n\n// Round the offsets to the nearest suitable subpixel based on the DPR.\n// Zooming can change the DPR, but it seems to report a value that will\n// cleanly divide the values into the appropriate subpixels.\nfunction roundOffsets({ x, y }): Offsets {\n  const win: Window = window;\n  const dpr = win.devicePixelRatio || 1;\n\n  return {\n    x: Math.round(x * dpr) / dpr || 0,\n    y: Math.round(y * dpr) / dpr || 0,\n  };\n}\n\nexport function mapToStyles({\n  popper,\n  popperRect,\n  placement,\n  offsets,\n  position,\n  gpuAcceleration,\n  adaptive,\n}: {\n  popper: HTMLElement,\n  popperRect: Rect,\n  placement: BasePlacement,\n  offsets: $Shape<{ x: number, y: number, centerOffset: number }>,\n  position: PositioningStrategy,\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n}) {\n  let { x, y } = roundOffsets(offsets);\n\n  const hasX = offsets.hasOwnProperty('x');\n  const hasY = offsets.hasOwnProperty('y');\n\n  let sideX: string = left;\n  let sideY: string = top;\n\n  const win: Window = window;\n\n  if (adaptive) {\n    let offsetParent = getOffsetParent(popper);\n    if (offsetParent === getWindow(popper)) {\n      offsetParent = getDocumentElement(popper);\n    }\n\n    // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it\n    /*:: offsetParent = (offsetParent: Element); */\n\n    if (placement === top) {\n      sideY = bottom;\n      y -= offsetParent.clientHeight - popperRect.height;\n      y *= gpuAcceleration ? 1 : -1;\n    }\n\n    if (placement === left) {\n      sideX = right;\n      x -= offsetParent.clientWidth - popperRect.width;\n      x *= gpuAcceleration ? 1 : -1;\n    }\n  }\n\n  const commonStyles = {\n    position,\n    ...(adaptive && unsetSides),\n  };\n\n  if (gpuAcceleration) {\n    return {\n      ...commonStyles,\n      [sideY]: hasY ? '0' : '',\n      [sideX]: hasX ? '0' : '',\n      // Layer acceleration can disable subpixel rendering which causes slightly\n      // blurry text on low PPI displays, so we want to use 2D transforms\n      // instead\n      transform:\n        (win.devicePixelRatio || 1) < 2\n          ? `translate(${x}px, ${y}px)`\n          : `translate3d(${x}px, ${y}px, 0)`,\n    };\n  }\n\n  return {\n    ...commonStyles,\n    [sideY]: hasY ? `${y}px` : '',\n    [sideX]: hasX ? `${x}px` : '',\n    transform: '',\n  };\n}\n\nfunction computeStyles({ state, options }: ModifierArguments<Options>) {\n  const { gpuAcceleration = true, adaptive = true } = options;\n\n  if (__DEV__) {\n    const transitionProperty =\n      getComputedStyle(state.elements.popper).transitionProperty || '';\n\n    if (\n      adaptive &&\n      ['transform', 'top', 'right', 'bottom', 'left'].some(\n        property => transitionProperty.indexOf(property) >= 0\n      )\n    ) {\n      console.warn(\n        [\n          'Popper: Detected CSS transitions on at least one of the following',\n          'CSS properties: \"transform\", \"top\", \"right\", \"bottom\", \"left\".',\n          '\\n\\n',\n          'Disable the \"computeStyles\" modifier\\'s `adaptive` option to allow',\n          'for smooth transitions, or remove these properties from the CSS',\n          'transition declaration on the popper element if only transitioning',\n          'opacity or background-color for example.',\n          '\\n\\n',\n          'We recommend using the popper element as a wrapper around an inner',\n          'element that can have any CSS property transitioned for animations.',\n        ].join(' ')\n      );\n    }\n  }\n\n  const commonStyles = {\n    placement: getBasePlacement(state.placement),\n    popper: state.elements.popper,\n    popperRect: state.rects.popper,\n    gpuAcceleration,\n  };\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.styles.popper = {\n      ...state.styles.popper,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.popperOffsets,\n        position: state.options.strategy,\n        adaptive,\n      }),\n    };\n  }\n\n  if (state.modifiersData.arrow != null) {\n    state.styles.arrow = {\n      ...state.styles.arrow,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.arrow,\n        position: 'absolute',\n        adaptive: false,\n      }),\n    };\n  }\n\n  state.attributes.popper = {\n    ...state.attributes.popper,\n    'data-popper-placement': state.placement,\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ComputeStylesModifier = Modifier<'computeStyles', Options>;\nexport default ({\n  name: 'computeStyles',\n  enabled: true,\n  phase: 'beforeWrite',\n  fn: computeStyles,\n  data: {},\n}: ComputeStylesModifier);\n","// @flow\nimport type { Modifier, ModifierArguments } from '../types';\nimport getNodeName from '../dom-utils/getNodeName';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// This modifier takes the styles prepared by the `computeStyles` modifier\n// and applies them to the HTMLElements such as popper and arrow\n\nfunction applyStyles({ state }: ModifierArguments<{||}>) {\n  Object.keys(state.elements).forEach(name => {\n    const style = state.styles[name] || {};\n\n    const attributes = state.attributes[name] || {};\n    const element = state.elements[name];\n\n    // arrow is optional + virtual elements\n    if (!isHTMLElement(element) || !getNodeName(element)) {\n      return;\n    }\n\n    // Flow doesn't support to extend this property, but it's the most\n    // effective way to apply styles to an HTMLElement\n    // $FlowFixMe\n    Object.assign(element.style, style);\n\n    Object.keys(attributes).forEach(name => {\n      const value = attributes[name];\n      if (value === false) {\n        element.removeAttribute(name);\n      } else {\n        element.setAttribute(name, value === true ? '' : value);\n      }\n    });\n  });\n}\n\nfunction effect({ state }: ModifierArguments<{||}>) {\n  const initialStyles = {\n    popper: {\n      position: state.options.strategy,\n      left: '0',\n      top: '0',\n      margin: '0',\n    },\n    arrow: {\n      position: 'absolute',\n    },\n    reference: {},\n  };\n\n  Object.assign(state.elements.popper.style, initialStyles.popper);\n\n  if (state.elements.arrow) {\n    Object.assign(state.elements.arrow.style, initialStyles.arrow);\n  }\n\n  return () => {\n    Object.keys(state.elements).forEach(name => {\n      const element = state.elements[name];\n      const attributes = state.attributes[name] || {};\n\n      const styleProperties = Object.keys(\n        state.styles.hasOwnProperty(name)\n          ? state.styles[name]\n          : initialStyles[name]\n      );\n\n      // Set all values to an empty string to unset them\n      const style = styleProperties.reduce((style, property) => {\n        style[property] = '';\n        return style;\n      }, {});\n\n      // arrow is optional + virtual elements\n      if (!isHTMLElement(element) || !getNodeName(element)) {\n        return;\n      }\n\n      // Flow doesn't support to extend this property, but it's the most\n      // effective way to apply styles to an HTMLElement\n      // $FlowFixMe\n      Object.assign(element.style, style);\n\n      Object.keys(attributes).forEach(attribute => {\n        element.removeAttribute(attribute);\n      });\n    });\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ApplyStylesModifier = Modifier<'applyStyles', {||}>;\nexport default ({\n  name: 'applyStyles',\n  enabled: true,\n  phase: 'write',\n  fn: applyStyles,\n  effect,\n  requires: ['computeStyles'],\n}: ApplyStylesModifier);\n","// @flow\nimport type { Placement } from '../enums';\nimport type { ModifierArguments, Modifier, Rect, Offsets } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport { top, left, right, placements } from '../enums';\n\ntype OffsetsFunction = ({\n  popper: Rect,\n  reference: Rect,\n  placement: Placement,\n}) => [?number, ?number];\n\ntype Offset = OffsetsFunction | [?number, ?number];\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  offset: Offset,\n};\n\nexport function distanceAndSkiddingToXY(\n  placement: Placement,\n  rects: { popper: Rect, reference: Rect },\n  offset: Offset\n): Offsets {\n  const basePlacement = getBasePlacement(placement);\n  const invertDistance = [left, top].indexOf(basePlacement) >= 0 ? -1 : 1;\n\n  let [skidding, distance] =\n    typeof offset === 'function'\n      ? offset({\n          ...rects,\n          placement,\n        })\n      : offset;\n\n  skidding = skidding || 0;\n  distance = (distance || 0) * invertDistance;\n\n  return [left, right].indexOf(basePlacement) >= 0\n    ? { x: distance, y: skidding }\n    : { x: skidding, y: distance };\n}\n\nfunction offset({ state, options, name }: ModifierArguments<Options>) {\n  const { offset = [0, 0] } = options;\n\n  const data = placements.reduce((acc, placement) => {\n    acc[placement] = distanceAndSkiddingToXY(placement, state.rects, offset);\n    return acc;\n  }, {});\n\n  const { x, y } = data[state.placement];\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.modifiersData.popperOffsets.x += x;\n    state.modifiersData.popperOffsets.y += y;\n  }\n\n  state.modifiersData[name] = data;\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type OffsetModifier = Modifier<'offset', Options>;\nexport default ({\n  name: 'offset',\n  enabled: true,\n  phase: 'main',\n  requires: ['popperOffsets'],\n  fn: offset,\n}: OffsetModifier);\n","// @flow\nimport type { Placement } from '../enums';\n\nconst hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };\n\nexport default function getOppositePlacement(placement: Placement): Placement {\n  return (placement.replace(\n    /left|right|bottom|top/g,\n    matched => hash[matched]\n  ): any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nconst hash = { start: 'end', end: 'start' };\n\nexport default function getOppositeVariationPlacement(\n  placement: Placement\n): Placement {\n  return (placement.replace(/start|end/g, matched => hash[matched]): any);\n}\n","// @flow\nimport type { State, Padding } from '../types';\nimport type {\n  Placement,\n  ComputedPlacement,\n  Boundary,\n  RootBoundary,\n} from '../enums';\nimport getVariation from './getVariation';\nimport {\n  variationPlacements,\n  basePlacements,\n  placements as allPlacements,\n} from '../enums';\nimport detectOverflow from './detectOverflow';\nimport getBasePlacement from './getBasePlacement';\n\ntype Options = {\n  placement: Placement,\n  padding: Padding,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  flipVariations: boolean,\n  allowedAutoPlacements?: Array<Placement>,\n};\n\n/*:: type OverflowsMap = { [ComputedPlacement]: number }; */\n/*;; type OverflowsMap = { [key in ComputedPlacement]: number }; */\n\nexport default function computeAutoPlacement(\n  state: $Shape<State>,\n  options: Options = {}\n): Array<ComputedPlacement> {\n  const {\n    placement,\n    boundary,\n    rootBoundary,\n    padding,\n    flipVariations,\n    allowedAutoPlacements = allPlacements,\n  } = options;\n\n  const variation = getVariation(placement);\n\n  const placements = variation\n    ? flipVariations\n      ? variationPlacements\n      : variationPlacements.filter(\n          (placement) => getVariation(placement) === variation\n        )\n    : basePlacements;\n\n  // $FlowFixMe\n  let allowedPlacements = placements.filter(\n    (placement) => allowedAutoPlacements.indexOf(placement) >= 0\n  );\n\n  if (allowedPlacements.length === 0) {\n    allowedPlacements = placements;\n\n    if (__DEV__) {\n      console.error(\n        [\n          'Popper: The `allowedAutoPlacements` option did not allow any',\n          'placements. Ensure the `placement` option matches the variation',\n          'of the allowed placements.',\n          'For example, \"auto\" cannot be used to allow \"bottom-start\".',\n          'Use \"auto-start\" instead.',\n        ].join(' ')\n      );\n    }\n  }\n\n  // $FlowFixMe: Flow seems to have problems with two array unions...\n  const overflows: OverflowsMap = allowedPlacements.reduce((acc, placement) => {\n    acc[placement] = detectOverflow(state, {\n      placement,\n      boundary,\n      rootBoundary,\n      padding,\n    })[getBasePlacement(placement)];\n\n    return acc;\n  }, {});\n\n  return Object.keys(overflows).sort((a, b) => overflows[a] - overflows[b]);\n}\n","// @flow\nimport type { Placement, Boundary, RootBoundary } from '../enums';\nimport type { ModifierArguments, Modifier, Padding } from '../types';\nimport getOppositePlacement from '../utils/getOppositePlacement';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getOppositeVariationPlacement from '../utils/getOppositeVariationPlacement';\nimport detectOverflow from '../utils/detectOverflow';\nimport computeAutoPlacement from '../utils/computeAutoPlacement';\nimport { bottom, top, start, right, left, auto } from '../enums';\nimport getVariation from '../utils/getVariation';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  mainAxis: boolean,\n  altAxis: boolean,\n  fallbackPlacements: Array<Placement>,\n  padding: Padding,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  altBoundary: boolean,\n  flipVariations: boolean,\n  allowedAutoPlacements: Array<Placement>,\n};\n\nfunction getExpandedFallbackPlacements(placement: Placement): Array<Placement> {\n  if (getBasePlacement(placement) === auto) {\n    return [];\n  }\n\n  const oppositePlacement = getOppositePlacement(placement);\n\n  return [\n    getOppositeVariationPlacement(placement),\n    oppositePlacement,\n    getOppositeVariationPlacement(oppositePlacement),\n  ];\n}\n\nfunction flip({ state, options, name }: ModifierArguments<Options>) {\n  if (state.modifiersData[name]._skip) {\n    return;\n  }\n\n  const {\n    mainAxis: checkMainAxis = true,\n    altAxis: checkAltAxis = true,\n    fallbackPlacements: specifiedFallbackPlacements,\n    padding,\n    boundary,\n    rootBoundary,\n    altBoundary,\n    flipVariations = true,\n    allowedAutoPlacements,\n  } = options;\n\n  const preferredPlacement = state.options.placement;\n  const basePlacement = getBasePlacement(preferredPlacement);\n  const isBasePlacement = basePlacement === preferredPlacement;\n\n  const fallbackPlacements =\n    specifiedFallbackPlacements ||\n    (isBasePlacement || !flipVariations\n      ? [getOppositePlacement(preferredPlacement)]\n      : getExpandedFallbackPlacements(preferredPlacement));\n\n  const placements = [preferredPlacement, ...fallbackPlacements].reduce(\n    (acc, placement) => {\n      return acc.concat(\n        getBasePlacement(placement) === auto\n          ? computeAutoPlacement(state, {\n              placement,\n              boundary,\n              rootBoundary,\n              padding,\n              flipVariations,\n              allowedAutoPlacements,\n            })\n          : placement\n      );\n    },\n    []\n  );\n\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n\n  const checksMap = new Map();\n  let makeFallbackChecks = true;\n  let firstFittingPlacement = placements[0];\n\n  for (let i = 0; i < placements.length; i++) {\n    const placement = placements[i];\n    const basePlacement = getBasePlacement(placement);\n    const isStartVariation = getVariation(placement) === start;\n    const isVertical = [top, bottom].indexOf(basePlacement) >= 0;\n    const len = isVertical ? 'width' : 'height';\n\n    const overflow = detectOverflow(state, {\n      placement,\n      boundary,\n      rootBoundary,\n      altBoundary,\n      padding,\n    });\n\n    let mainVariationSide: any = isVertical\n      ? isStartVariation\n        ? right\n        : left\n      : isStartVariation\n      ? bottom\n      : top;\n\n    if (referenceRect[len] > popperRect[len]) {\n      mainVariationSide = getOppositePlacement(mainVariationSide);\n    }\n\n    const altVariationSide: any = getOppositePlacement(mainVariationSide);\n\n    const checks = [];\n\n    if (checkMainAxis) {\n      checks.push(overflow[basePlacement] <= 0);\n    }\n\n    if (checkAltAxis) {\n      checks.push(\n        overflow[mainVariationSide] <= 0,\n        overflow[altVariationSide] <= 0\n      );\n    }\n\n    if (checks.every((check) => check)) {\n      firstFittingPlacement = placement;\n      makeFallbackChecks = false;\n      break;\n    }\n\n    checksMap.set(placement, checks);\n  }\n\n  if (makeFallbackChecks) {\n    // `2` may be desired in some cases – research later\n    const numberOfChecks = flipVariations ? 3 : 1;\n\n    for (let i = numberOfChecks; i > 0; i--) {\n      const fittingPlacement = placements.find((placement) => {\n        const checks = checksMap.get(placement);\n        if (checks) {\n          return checks.slice(0, i).every((check) => check);\n        }\n      });\n\n      if (fittingPlacement) {\n        firstFittingPlacement = fittingPlacement;\n        break;\n      }\n    }\n  }\n\n  if (state.placement !== firstFittingPlacement) {\n    state.modifiersData[name]._skip = true;\n    state.placement = firstFittingPlacement;\n    state.reset = true;\n  }\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type FlipModifier = Modifier<'flip', Options>;\nexport default ({\n  name: 'flip',\n  enabled: true,\n  phase: 'main',\n  fn: flip,\n  requiresIfExists: ['offset'],\n  data: { _skip: false },\n}: FlipModifier);\n","// @flow\n\nexport default function getAltAxis(axis: 'x' | 'y'): 'x' | 'y' {\n  return axis === 'x' ? 'y' : 'x';\n}\n","// @flow\n\nexport default function within(\n  min: number,\n  value: number,\n  max: number\n): number {\n  return Math.max(min, Math.min(value, max));\n}\n","// @flow\nimport { top, left, right, bottom, start } from '../enums';\nimport type { Placement, Boundary, RootBoundary } from '../enums';\nimport type { Rect, ModifierArguments, Modifier, Padding } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getMainAxisFromPlacement from '../utils/getMainAxisFromPlacement';\nimport getAltAxis from '../utils/getAltAxis';\nimport within from '../utils/within';\nimport getLayoutRect from '../dom-utils/getLayoutRect';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport detectOverflow from '../utils/detectOverflow';\nimport getVariation from '../utils/getVariation';\nimport getFreshSideObject from '../utils/getFreshSideObject';\n\ntype TetherOffset =\n  | (({\n      popper: Rect,\n      reference: Rect,\n      placement: Placement,\n    }) => number)\n  | number;\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  /* Prevents boundaries overflow on the main axis */\n  mainAxis: boolean,\n  /* Prevents boundaries overflow on the alternate axis */\n  altAxis: boolean,\n  /* The area to check the popper is overflowing in */\n  boundary: Boundary,\n  /* If the popper is not overflowing the main area, fallback to this one */\n  rootBoundary: RootBoundary,\n  /* Use the reference's \"clippingParents\" boundary context */\n  altBoundary: boolean,\n  /**\n   * Allows the popper to overflow from its boundaries to keep it near its\n   * reference element\n   */\n  tether: boolean,\n  /* Offsets when the `tether` option should activate */\n  tetherOffset: TetherOffset,\n  /* Sets a padding to the provided boundary */\n  padding: Padding,\n};\n\nfunction preventOverflow({ state, options, name }: ModifierArguments<Options>) {\n  const {\n    mainAxis: checkMainAxis = true,\n    altAxis: checkAltAxis = false,\n    boundary,\n    rootBoundary,\n    altBoundary,\n    padding,\n    tether = true,\n    tetherOffset = 0,\n  } = options;\n\n  const overflow = detectOverflow(state, {\n    boundary,\n    rootBoundary,\n    padding,\n    altBoundary,\n  });\n  const basePlacement = getBasePlacement(state.placement);\n  const variation = getVariation(state.placement);\n  const isBasePlacement = !variation;\n  const mainAxis = getMainAxisFromPlacement(basePlacement);\n  const altAxis = getAltAxis(mainAxis);\n  const popperOffsets = state.modifiersData.popperOffsets;\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n  const tetherOffsetValue =\n    typeof tetherOffset === 'function'\n      ? tetherOffset({\n          ...state.rects,\n          placement: state.placement,\n        })\n      : tetherOffset;\n\n  const data = { x: 0, y: 0 };\n\n  if (!popperOffsets) {\n    return;\n  }\n\n  if (checkMainAxis) {\n    const mainSide = mainAxis === 'y' ? top : left;\n    const altSide = mainAxis === 'y' ? bottom : right;\n    const len = mainAxis === 'y' ? 'height' : 'width';\n    const offset = popperOffsets[mainAxis];\n\n    const min = popperOffsets[mainAxis] + overflow[mainSide];\n    const max = popperOffsets[mainAxis] - overflow[altSide];\n\n    const additive = tether ? -popperRect[len] / 2 : 0;\n\n    const minLen = variation === start ? referenceRect[len] : popperRect[len];\n    const maxLen = variation === start ? -popperRect[len] : -referenceRect[len];\n\n    // We need to include the arrow in the calculation so the arrow doesn't go\n    // outside the reference bounds\n    const arrowElement = state.elements.arrow;\n    const arrowRect =\n      tether && arrowElement\n        ? getLayoutRect(arrowElement)\n        : { width: 0, height: 0 };\n    const arrowPaddingObject = state.modifiersData['arrow#persistent']\n      ? state.modifiersData['arrow#persistent'].padding\n      : getFreshSideObject();\n    const arrowPaddingMin = arrowPaddingObject[mainSide];\n    const arrowPaddingMax = arrowPaddingObject[altSide];\n\n    // If the reference length is smaller than the arrow length, we don't want\n    // to include its full size in the calculation. If the reference is small\n    // and near the edge of a boundary, the popper can overflow even if the\n    // reference is not overflowing as well (e.g. virtual elements with no\n    // width or height)\n    const arrowLen = within(0, referenceRect[len], arrowRect[len]);\n\n    const minOffset = isBasePlacement\n      ? referenceRect[len] / 2 -\n        additive -\n        arrowLen -\n        arrowPaddingMin -\n        tetherOffsetValue\n      : minLen - arrowLen - arrowPaddingMin - tetherOffsetValue;\n    const maxOffset = isBasePlacement\n      ? -referenceRect[len] / 2 +\n        additive +\n        arrowLen +\n        arrowPaddingMax +\n        tetherOffsetValue\n      : maxLen + arrowLen + arrowPaddingMax + tetherOffsetValue;\n\n    const arrowOffsetParent =\n      state.elements.arrow && getOffsetParent(state.elements.arrow);\n    const clientOffset = arrowOffsetParent\n      ? mainAxis === 'y'\n        ? arrowOffsetParent.clientTop || 0\n        : arrowOffsetParent.clientLeft || 0\n      : 0;\n\n    const offsetModifierValue = state.modifiersData.offset\n      ? state.modifiersData.offset[state.placement][mainAxis]\n      : 0;\n\n    const tetherMin =\n      popperOffsets[mainAxis] + minOffset - offsetModifierValue - clientOffset;\n    const tetherMax = popperOffsets[mainAxis] + maxOffset - offsetModifierValue;\n\n    const preventedOffset = within(\n      tether ? Math.min(min, tetherMin) : min,\n      offset,\n      tether ? Math.max(max, tetherMax) : max\n    );\n\n    popperOffsets[mainAxis] = preventedOffset;\n    data[mainAxis] = preventedOffset - offset;\n  }\n\n  if (checkAltAxis) {\n    const mainSide = mainAxis === 'x' ? top : left;\n    const altSide = mainAxis === 'x' ? bottom : right;\n    const offset = popperOffsets[altAxis];\n\n    const min = offset + overflow[mainSide];\n    const max = offset - overflow[altSide];\n\n    const preventedOffset = within(min, offset, max);\n\n    popperOffsets[altAxis] = preventedOffset;\n    data[altAxis] = preventedOffset - offset;\n  }\n\n  state.modifiersData[name] = data;\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PreventOverflowModifier = Modifier<'preventOverflow', Options>;\nexport default ({\n  name: 'preventOverflow',\n  enabled: true,\n  phase: 'main',\n  fn: preventOverflow,\n  requiresIfExists: ['offset'],\n}: PreventOverflowModifier);\n","// @flow\nimport type { Modifier, ModifierArguments, Padding } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getLayoutRect from '../dom-utils/getLayoutRect';\nimport contains from '../dom-utils/contains';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getMainAxisFromPlacement from '../utils/getMainAxisFromPlacement';\nimport within from '../utils/within';\nimport mergePaddingObject from '../utils/mergePaddingObject';\nimport expandToHashMap from '../utils/expandToHashMap';\nimport { left, right, basePlacements, top, bottom } from '../enums';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  element: HTMLElement | string | null,\n  padding: Padding,\n};\n\nfunction arrow({ state, name }: ModifierArguments<Options>) {\n  const arrowElement = state.elements.arrow;\n  const popperOffsets = state.modifiersData.popperOffsets;\n  const basePlacement = getBasePlacement(state.placement);\n  const axis = getMainAxisFromPlacement(basePlacement);\n  const isVertical = [left, right].indexOf(basePlacement) >= 0;\n  const len = isVertical ? 'height' : 'width';\n\n  if (!arrowElement || !popperOffsets) {\n    return;\n  }\n\n  const paddingObject = state.modifiersData[`${name}#persistent`].padding;\n  const arrowRect = getLayoutRect(arrowElement);\n  const minProp = axis === 'y' ? top : left;\n  const maxProp = axis === 'y' ? bottom : right;\n\n  const endDiff =\n    state.rects.reference[len] +\n    state.rects.reference[axis] -\n    popperOffsets[axis] -\n    state.rects.popper[len];\n  const startDiff = popperOffsets[axis] - state.rects.reference[axis];\n\n  const arrowOffsetParent = getOffsetParent(arrowElement);\n  const clientSize = arrowOffsetParent\n    ? axis === 'y'\n      ? arrowOffsetParent.clientHeight || 0\n      : arrowOffsetParent.clientWidth || 0\n    : 0;\n\n  const centerToReference = endDiff / 2 - startDiff / 2;\n\n  // Make sure the arrow doesn't overflow the popper if the center point is\n  // outside of the popper bounds\n  const min = paddingObject[minProp];\n  const max = clientSize - arrowRect[len] - paddingObject[maxProp];\n  const center = clientSize / 2 - arrowRect[len] / 2 + centerToReference;\n  const offset = within(min, center, max);\n\n  // Prevents breaking syntax highlighting...\n  const axisProp: string = axis;\n  state.modifiersData[name] = {\n    [axisProp]: offset,\n    centerOffset: offset - center,\n  };\n}\n\nfunction effect({ state, options, name }: ModifierArguments<Options>) {\n  let { element: arrowElement = '[data-popper-arrow]', padding = 0 } = options;\n\n  if (arrowElement == null) {\n    return;\n  }\n\n  // CSS selector\n  if (typeof arrowElement === 'string') {\n    arrowElement = state.elements.popper.querySelector(arrowElement);\n\n    if (!arrowElement) {\n      return;\n    }\n  }\n\n  if (__DEV__) {\n    if (!isHTMLElement(arrowElement)) {\n      console.error(\n        [\n          'Popper: \"arrow\" element must be an HTMLElement (not an SVGElement).',\n          'To use an SVG arrow, wrap it in an HTMLElement that will be used as',\n          'the arrow.',\n        ].join(' ')\n      );\n    }\n  }\n\n  if (!contains(state.elements.popper, arrowElement)) {\n    if (__DEV__) {\n      console.error(\n        [\n          'Popper: \"arrow\" modifier\\'s `element` must be a child of the popper',\n          'element.',\n        ].join(' ')\n      );\n    }\n\n    return;\n  }\n\n  state.elements.arrow = arrowElement;\n  state.modifiersData[`${name}#persistent`] = {\n    padding: mergePaddingObject(\n      typeof padding !== 'number'\n        ? padding\n        : expandToHashMap(padding, basePlacements)\n    ),\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ArrowModifier = Modifier<'arrow', Options>;\nexport default ({\n  name: 'arrow',\n  enabled: true,\n  phase: 'main',\n  fn: arrow,\n  effect,\n  requires: ['popperOffsets'],\n  requiresIfExists: ['preventOverflow'],\n}: ArrowModifier);\n","// @flow\nimport type {\n  ModifierArguments,\n  Modifier,\n  Rect,\n  SideObject,\n  Offsets,\n} from '../types';\nimport { top, bottom, left, right } from '../enums';\nimport detectOverflow from '../utils/detectOverflow';\n\nfunction getSideOffsets(\n  overflow: SideObject,\n  rect: Rect,\n  preventedOffsets: Offsets = { x: 0, y: 0 }\n): SideObject {\n  return {\n    top: overflow.top - rect.height - preventedOffsets.y,\n    right: overflow.right - rect.width + preventedOffsets.x,\n    bottom: overflow.bottom - rect.height + preventedOffsets.y,\n    left: overflow.left - rect.width - preventedOffsets.x,\n  };\n}\n\nfunction isAnySideFullyClipped(overflow: SideObject): boolean {\n  return [top, right, bottom, left].some((side) => overflow[side] >= 0);\n}\n\nfunction hide({ state, name }: ModifierArguments<{||}>) {\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n  const preventedOffsets = state.modifiersData.preventOverflow;\n\n  const referenceOverflow = detectOverflow(state, {\n    elementContext: 'reference',\n  });\n  const 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diff --git a/web-tools/web/_static/popperjs/popper.min.js b/web-tools/web/_static/popperjs/popper.min.js
new file mode 100644
index 0000000..4c81147
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper.min.js
@@ -0,0 +1,6 @@
+/**
+ * @popperjs/core v2.5.4 - MIT License
+ */
+
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w=l[p]+n[v],x=l[p]-n[b],j=i?-m[O]/2:0,E="start"===f?d[O]:m[O];f="start"===f?-m[O]:-d[O],m=t.elements.arrow,m=i&&m?u(m):{width:0,height:0};var D=t.modifiersData["arrow#persistent"]?t.modifiersData["arrow#persistent"].padding:{top:0,right:0,bottom:0,left:0};v=D[v],b=D[b],m=Math.max(0,Math.min(d[O],m[O])),E=c?d[O]/2-j-m-v-h:E-m-v-h,c=c?-d[O]/2+j+m+b+h:f+m+b+h,h=t.elements.arrow&&g(t.elements.arrow),d=t.modifiersData.offset?t.modifiersData.offset[t.placement][p]:0,h=l[p]+E-d-(h?"y"===p?h.clientTop||0:h.clientLeft||0:0),c=l[p]+c-d,i=Math.max(i?Math.min(w,h):w,Math.min(o,i?Math.max(x,c):x)),l[p]=i,s[p]=i-o}r&&(r=l[a],i=Math.max(r+n["x"===p?"top":"left"],Math.min(r,r-n["x"===p?"bottom":"right"])),l[a]=i,s[a]=i-r),t.modifiersData[e]=s}},requiresIfExists:["offset"]},Z={name:"arrow",enabled:!0,phase:"main",fn:function(e){var t,n=e.state;e=e.name;var r=n.elements.arrow,o=n.modifiersData.popperOffsets,i=y(n.placement),a=M(i);if(i=0<=["left","right"].indexOf(i)?"height":"width",r&&o){var s=n.modifiersData[e+"#persistent"].padding,f=u(r),c="y"===a?"top":"left",p="y"===a?"bottom":"right",l=n.rects.reference[i]+n.rects.reference[a]-o[a]-n.rects.popper[i];o=o[a]-n.rects.reference[a],l=(r=(r=g(r))?"y"===a?r.clientHeight||0:r.clientWidth||0:0)/2-f[i]/2+(l/2-o/2),i=Math.max(s[c],Math.min(l,r-f[i]-s[p])),n.modifiersData[e]=((t={})[a]=i,t.centerOffset=i-l,t)}},effect:function(e){var t=e.state,n=e.options;e=e.name;var r=n.element;if(r=void 0===r?"[data-popper-arrow]":r,n=void 0===(n=n.padding)?0:n,null!=r){if("string"==typeof r&&!(r=t.elements.popper.querySelector(r)))return;O(t.elements.popper,r)&&(t.elements.arrow=r,t.modifiersData[e+"#persistent"]={padding:D("number"!=typeof n?n:P(n,T))})}},requires:["popperOffsets"],requiresIfExists:["preventOverflow"]},$={name:"hide",enabled:!0,phase:"main",requiresIfExists:["preventOverflow"],fn:function(e){var t=e.state;e=e.name;var n=t.rects.reference,r=t.rects.popper,o=t.modifiersData.preventOverflow,i=L(t,{elementContext:"reference"}),a=L(t,{altBoundary:!0});n=R(i,n),r=R(a,r,o),o=S(n),a=S(r),t.modifiersData[e]={referenceClippingOffsets:n,popperEscapeOffsets:r,isReferenceHidden:o,hasPopperEscaped:a},t.attributes.popper=Object.assign(Object.assign({},t.attributes.popper),{},{"data-popper-reference-hidden":o,"data-popper-escaped":a})}},ee=B({defaultModifiers:[_,U,F,X]}),te=[_,U,F,X,Y,K,Q,Z,$],ne=B({defaultModifiers:te});e.applyStyles=X,e.arrow=Z,e.computeStyles=F,e.createPopper=ne,e.createPopperLite=ee,e.defaultModifiers=te,e.detectOverflow=L,e.eventListeners=_,e.flip=K,e.hide=$,e.offset=Y,e.popperGenerator=B,e.popperOffsets=U,e.preventOverflow=Q,Object.defineProperty(e,"__esModule",{value:!0})}));
+//# sourceMappingURL=popper.min.js.map
diff --git a/web-tools/web/_static/popperjs/popper.min.js.flow b/web-tools/web/_static/popperjs/popper.min.js.flow
new file mode 100644
index 0000000..e745d92
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper.min.js.flow
@@ -0,0 +1,3 @@
+// @flow
+
+export * from '../../lib/popper.js'
diff --git a/web-tools/web/_static/popperjs/popper.min.js.map b/web-tools/web/_static/popperjs/popper.min.js.map
new file mode 100644
index 0000000..7c98e01
--- /dev/null
+++ b/web-tools/web/_static/popperjs/popper.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"popper.min.js","sources":["../../src/dom-utils/getBoundingClientRect.js","../../src/dom-utils/getWindow.js","../../src/dom-utils/getWindowScroll.js","../../src/dom-utils/instanceOf.js","../../src/dom-utils/getNodeName.js","../../src/dom-utils/getDocumentElement.js","../../src/dom-utils/getWindowScrollBarX.js","../../src/dom-utils/getComputedStyle.js","../../src/dom-utils/isScrollParent.js","../../src/dom-utils/getCompositeRect.js","../../src/dom-utils/getNodeScroll.js","../../src/dom-utils/getHTMLElementScroll.js","../../src/dom-utils/getLayoutRect.js","../../src/dom-utils/getParentNode.js","../../src/dom-utils/listScrollParents.js","../../src/dom-utils/getScrollParent.js","../../src/dom-utils/getOffsetParent.js","../../src/dom-utils/isTableElement.js","../../src/utils/orderModifiers.js","../../src/utils/debounce.js","../../src/utils/getBasePlacement.js","../../src/dom-utils/contains.js","../../src/utils/rectToClientRect.js","../../src/dom-utils/getClippingRect.js","../../src/enums.js","../../src/dom-utils/getViewportRect.js","../../src/dom-utils/getDocumentRect.js","../../src/utils/getMainAxisFromPlacement.js","../../src/utils/computeOffsets.js","../../src/utils/getVariation.js","../../src/utils/mergePaddingObject.js","../../src/utils/getFreshSideObject.js","../../src/utils/expandToHashMap.js","../../src/utils/detectOverflow.js","../../src/createPopper.js","../../src/utils/mergeByName.js","../../src/modifiers/computeStyles.js","../../src/utils/getOppositePlacement.js","../../src/utils/getOppositeVariationPlacement.js","../../src/modifiers/hide.js","../../src/modifiers/eventListeners.js","../../src/modifiers/popperOffsets.js","../../src/modifiers/applyStyles.js","../../src/modifiers/offset.js","../../src/modifiers/flip.js","../../src/utils/computeAutoPlacement.js","../../src/modifiers/preventOverflow.js","../../src/utils/getAltAxis.js","../../src/utils/within.js","../../src/modifiers/arrow.js","../../src/popper-lite.js","../../src/popper.js"],"sourcesContent":["// @flow\nimport type { ClientRectObject, VirtualElement } from '../types';\n\nexport default function getBoundingClientRect(\n  element: Element | VirtualElement\n): ClientRectObject {\n  const rect = element.getBoundingClientRect();\n\n  return {\n    width: rect.width,\n    height: rect.height,\n    top: rect.top,\n    right: rect.right,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    y: rect.top,\n  };\n}\n","// @flow\n/*:: import type { Window } from '../types'; */\n/*:: declare function getWindow(node: Node | Window): Window; */\n\nexport default function getWindow(node) {\n  if (node.toString() !== '[object Window]') {\n    const ownerDocument = node.ownerDocument;\n    return ownerDocument ? ownerDocument.defaultView || window : window;\n  }\n\n  return node;\n}\n","// @flow\nimport getWindow from './getWindow';\nimport type { Window } from '../types';\n\nexport default function getWindowScroll(node: Node | Window) {\n  const win = getWindow(node);\n  const scrollLeft = win.pageXOffset;\n  const scrollTop = win.pageYOffset;\n\n  return {\n    scrollLeft,\n    scrollTop,\n  };\n}\n","// @flow\nimport getWindow from './getWindow';\n\n/*:: declare function isElement(node: mixed): boolean %checks(node instanceof\n  Element); */\n\nfunction isElement(node) {\n  const OwnElement = getWindow(node).Element;\n  return node instanceof OwnElement || node instanceof Element;\n}\n\n/*:: declare function isHTMLElement(node: mixed): boolean %checks(node instanceof\n  HTMLElement); */\n\nfunction isHTMLElement(node) {\n  const OwnElement = getWindow(node).HTMLElement;\n  return node instanceof OwnElement || node instanceof HTMLElement;\n}\n\n/*:: declare function isShadowRoot(node: mixed): boolean %checks(node instanceof\n  ShadowRoot); */\n\nfunction isShadowRoot(node) {\n  const OwnElement = getWindow(node).ShadowRoot;\n  return node instanceof OwnElement || node instanceof ShadowRoot;\n}\n\nexport { isElement, isHTMLElement, isShadowRoot };\n","// @flow\nimport type { Window } from '../types';\n\nexport default function getNodeName(element: ?Node | Window): ?string {\n  return element ? (element.nodeName || '').toLowerCase() : null;\n}\n","// @flow\nimport { isElement } from './instanceOf';\nimport type { Window } from '../types';\n\nexport default function getDocumentElement(\n  element: Element | Window\n): HTMLElement {\n  // $FlowFixMe: assume body is always available\n  return ((isElement(element) ? element.ownerDocument : element.document) || window.document)\n    .documentElement;\n}\n","// @flow\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScroll from './getWindowScroll';\n\nexport default function getWindowScrollBarX(element: Element): number {\n  // If <html> has a CSS width greater than the viewport, then this will be\n  // incorrect for RTL.\n  // Popper 1 is broken in this case and never had a bug report so let's assume\n  // it's not an issue. I don't think anyone ever specifies width on <html>\n  // anyway.\n  // Browsers where the left scrollbar doesn't cause an issue report `0` for\n  // this (e.g. Edge 2019, IE11, Safari)\n  return (\n    getBoundingClientRect(getDocumentElement(element)).left +\n    getWindowScroll(element).scrollLeft\n  );\n}\n","// @flow\nimport getWindow from './getWindow';\n\nexport default function getComputedStyle(\n  element: Element\n): CSSStyleDeclaration {\n  return getWindow(element).getComputedStyle(element);\n}\n","// @flow\nimport getComputedStyle from './getComputedStyle';\n\nexport default function isScrollParent(element: HTMLElement): boolean {\n  // Firefox wants us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY } = getComputedStyle(element);\n  return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);\n}\n","// @flow\nimport type { Rect, VirtualElement, Window } from '../types';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getNodeScroll from './getNodeScroll';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getDocumentElement from './getDocumentElement';\nimport isScrollParent from './isScrollParent';\n\n// Returns the composite rect of an element relative to its offsetParent.\n// Composite means it takes into account transforms as well as layout.\nexport default function getCompositeRect(\n  elementOrVirtualElement: Element | VirtualElement,\n  offsetParent: Element | Window,\n  isFixed: boolean = false\n): Rect {\n  const documentElement = getDocumentElement(offsetParent);\n  const rect = getBoundingClientRect(elementOrVirtualElement);\n  const isOffsetParentAnElement = isHTMLElement(offsetParent);\n\n  let scroll = { scrollLeft: 0, scrollTop: 0 };\n  let offsets = { x: 0, y: 0 };\n\n  if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {\n    if (\n      getNodeName(offsetParent) !== 'body' ||\n      // https://github.com/popperjs/popper-core/issues/1078\n      isScrollParent(documentElement)\n    ) {\n      scroll = getNodeScroll(offsetParent);\n    }\n\n    if (isHTMLElement(offsetParent)) {\n      offsets = getBoundingClientRect(offsetParent);\n      offsets.x += offsetParent.clientLeft;\n      offsets.y += offsetParent.clientTop;\n    } else if (documentElement) {\n      offsets.x = getWindowScrollBarX(documentElement);\n    }\n  }\n\n  return {\n    x: rect.left + scroll.scrollLeft - offsets.x,\n    y: rect.top + scroll.scrollTop - offsets.y,\n    width: rect.width,\n    height: rect.height,\n  };\n}\n","// @flow\nimport getWindowScroll from './getWindowScroll';\nimport getWindow from './getWindow';\nimport { isHTMLElement } from './instanceOf';\nimport getHTMLElementScroll from './getHTMLElementScroll';\nimport type { Window } from '../types';\n\nexport default function getNodeScroll(node: Node | Window) {\n  if (node === getWindow(node) || !isHTMLElement(node)) {\n    return getWindowScroll(node);\n  } else {\n    return getHTMLElementScroll(node);\n  }\n}\n","// @flow\n\nexport default function getHTMLElementScroll(element: HTMLElement) {\n  return {\n    scrollLeft: element.scrollLeft,\n    scrollTop: element.scrollTop,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\n\n// Returns the layout rect of an element relative to its offsetParent. Layout\n// means it doesn't take into account transforms.\nexport default function getLayoutRect(element: HTMLElement): Rect {\n  return {\n    x: element.offsetLeft,\n    y: element.offsetTop,\n    width: element.offsetWidth,\n    height: element.offsetHeight,\n  };\n}\n","// @flow\nimport getNodeName from './getNodeName';\nimport getDocumentElement from './getDocumentElement';\n\nexport default function getParentNode(element: Node | ShadowRoot): Node {\n  if (getNodeName(element) === 'html') {\n    return element;\n  }\n\n  return (\n    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle\n    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node\n    element.parentNode || // DOM Element detected\n    // $FlowFixMe: need a better way to handle this...\n    element.host || // ShadowRoot detected\n    // $FlowFixMe: HTMLElement is a Node\n    getDocumentElement(element) // fallback\n  );\n}\n","// @flow\nimport getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport getNodeName from './getNodeName';\nimport getWindow from './getWindow';\nimport type { Window, VisualViewport } from '../types';\nimport isScrollParent from './isScrollParent';\n\n/*\ngiven a DOM element, return the list of all scroll parents, up the list of ancesors\nuntil we get to the top window object. This list is what we attach scroll listeners\nto, because if any of these parent elements scroll, we'll need to re-calculate the \nreference element's position.\n*/\nexport default function listScrollParents(\n  element: Node,\n  list: Array<Element | Window> = []\n): Array<Element | Window | VisualViewport> {\n  const scrollParent = getScrollParent(element);\n  const isBody = getNodeName(scrollParent) === 'body';\n  const win = getWindow(scrollParent);\n  const target = isBody\n    ? [win].concat(\n        win.visualViewport || [],\n        isScrollParent(scrollParent) ? scrollParent : []\n      )\n    : scrollParent;\n  const updatedList = list.concat(target);\n\n  return isBody\n    ? updatedList\n    : // $FlowFixMe: isBody tells us target will be an HTMLElement here\n      updatedList.concat(listScrollParents(getParentNode(target)));\n}\n","// @flow\nimport getParentNode from './getParentNode';\nimport isScrollParent from './isScrollParent';\nimport getNodeName from './getNodeName';\nimport { isHTMLElement } from './instanceOf';\n\nexport default function getScrollParent(node: Node): HTMLElement {\n  if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {\n    // $FlowFixMe: assume body is always available\n    return node.ownerDocument.body;\n  }\n\n  if (isHTMLElement(node) && isScrollParent(node)) {\n    return node;\n  }\n\n  return getScrollParent(getParentNode(node));\n}\n","// @flow\nimport getWindow from './getWindow';\nimport getNodeName from './getNodeName';\nimport getComputedStyle from './getComputedStyle';\nimport { isHTMLElement } from './instanceOf';\nimport isTableElement from './isTableElement';\nimport getParentNode from './getParentNode';\nimport getDocumentElement from './getDocumentElement';\n\nfunction getTrueOffsetParent(element: Element): ?Element {\n  if (\n    !isHTMLElement(element) ||\n    // https://github.com/popperjs/popper-core/issues/837\n    getComputedStyle(element).position === 'fixed'\n  ) {\n    return null;\n  }\n\n  const offsetParent = element.offsetParent;\n\n  if (offsetParent) {\n    const html = getDocumentElement(offsetParent);\n\n    if (\n      getNodeName(offsetParent) === 'body' &&\n      getComputedStyle(offsetParent).position === 'static' &&\n      getComputedStyle(html).position !== 'static'\n    ) {\n      return html;\n    }\n  }\n\n  return offsetParent;\n}\n\n// `.offsetParent` reports `null` for fixed elements, while absolute elements\n// return the containing block\nfunction getContainingBlock(element: Element) {\n  let currentNode = getParentNode(element);\n\n  while (\n    isHTMLElement(currentNode) &&\n    ['html', 'body'].indexOf(getNodeName(currentNode)) < 0\n  ) {\n    const css = getComputedStyle(currentNode);\n\n    // This is non-exhaustive but covers the most common CSS properties that\n    // create a containing block.\n    if (\n      css.transform !== 'none' ||\n      css.perspective !== 'none' ||\n      (css.willChange && css.willChange !== 'auto')\n    ) {\n      return currentNode;\n    } else {\n      currentNode = currentNode.parentNode;\n    }\n  }\n\n  return null;\n}\n\n// Gets the closest ancestor positioned element. Handles some edge cases,\n// such as table ancestors and cross browser bugs.\nexport default function getOffsetParent(element: Element) {\n  const window = getWindow(element);\n\n  let offsetParent = getTrueOffsetParent(element);\n\n  while (\n    offsetParent &&\n    isTableElement(offsetParent) &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    offsetParent = getTrueOffsetParent(offsetParent);\n  }\n\n  if (\n    offsetParent &&\n    getNodeName(offsetParent) === 'body' &&\n    getComputedStyle(offsetParent).position === 'static'\n  ) {\n    return window;\n  }\n\n  return offsetParent || getContainingBlock(element) || window;\n}\n","// @flow\nimport getNodeName from './getNodeName';\n\nexport default function isTableElement(element: Element): boolean {\n  return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;\n}\n","// @flow\nimport type { Modifier } from '../types';\nimport { modifierPhases } from '../enums';\n\n// source: https://stackoverflow.com/questions/49875255\nfunction order(modifiers) {\n  const map = new Map();\n  const visited = new Set();\n  const result = [];\n\n  modifiers.forEach(modifier => {\n    map.set(modifier.name, modifier);\n  });\n\n  // On visiting object, check for its dependencies and visit them recursively\n  function sort(modifier: Modifier<any, any>) {\n    visited.add(modifier.name);\n\n    const requires = [\n      ...(modifier.requires || []),\n      ...(modifier.requiresIfExists || []),\n    ];\n\n    requires.forEach(dep => {\n      if (!visited.has(dep)) {\n        const depModifier = map.get(dep);\n\n        if (depModifier) {\n          sort(depModifier);\n        }\n      }\n    });\n\n    result.push(modifier);\n  }\n\n  modifiers.forEach(modifier => {\n    if (!visited.has(modifier.name)) {\n      // check for visited object\n      sort(modifier);\n    }\n  });\n\n  return result;\n}\n\nexport default function orderModifiers(\n  modifiers: Array<Modifier<any, any>>\n): Array<Modifier<any, any>> {\n  // order based on dependencies\n  const orderedModifiers = order(modifiers);\n\n  // order based on phase\n  return modifierPhases.reduce((acc, phase) => {\n    return acc.concat(\n      orderedModifiers.filter(modifier => modifier.phase === phase)\n    );\n  }, []);\n}\n","// @flow\n\nexport default function debounce<T>(fn: Function): () => Promise<T> {\n  let pending;\n  return () => {\n    if (!pending) {\n      pending = new Promise<T>(resolve => {\n        Promise.resolve().then(() => {\n          pending = undefined;\n          resolve(fn());\n        });\n      });\n    }\n\n    return pending;\n  };\n}\n","// @flow\nimport { type BasePlacement, type Placement, auto } from '../enums';\n\nexport default function getBasePlacement(\n  placement: Placement | typeof auto\n): BasePlacement {\n  return (placement.split('-')[0]: any);\n}\n","// @flow\nimport { isShadowRoot } from './instanceOf';\n\nexport default function contains(parent: Element, child: Element) {\n  const rootNode = child.getRootNode && child.getRootNode();\n\n  // First, attempt with faster native method\n  if (parent.contains(child)) {\n    return true;\n  }\n  // then fallback to custom implementation with Shadow DOM support\n  else if (rootNode && isShadowRoot(rootNode)) {\n    let next = child;\n    do {\n      if (next && parent.isSameNode(next)) {\n        return true;\n      }\n      // $FlowFixMe: need a better way to handle this...\n      next = next.parentNode || next.host;\n    } while (next);\n  }\n\n  // Give up, the result is false\n  return false;\n}\n","// @flow\nimport type { Rect, ClientRectObject } from '../types';\n\nexport default function rectToClientRect(rect: Rect): ClientRectObject {\n  return {\n    ...rect,\n    left: rect.x,\n    top: rect.y,\n    right: rect.x + rect.width,\n    bottom: rect.y + rect.height,\n  };\n}\n","// @flow\nimport type { ClientRectObject } from '../types';\nimport type { Boundary, RootBoundary } from '../enums';\nimport { viewport } from '../enums';\nimport getViewportRect from './getViewportRect';\nimport getDocumentRect from './getDocumentRect';\nimport listScrollParents from './listScrollParents';\nimport getOffsetParent from './getOffsetParent';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport { isElement, isHTMLElement } from './instanceOf';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport getParentNode from './getParentNode';\nimport contains from './contains';\nimport getNodeName from './getNodeName';\nimport rectToClientRect from '../utils/rectToClientRect';\n\nfunction getInnerBoundingClientRect(element: Element) {\n  const rect = getBoundingClientRect(element);\n\n  rect.top = rect.top + element.clientTop;\n  rect.left = rect.left + element.clientLeft;\n  rect.bottom = rect.top + element.clientHeight;\n  rect.right = rect.left + element.clientWidth;\n  rect.width = element.clientWidth;\n  rect.height = element.clientHeight;\n  rect.x = rect.left;\n  rect.y = rect.top;\n\n  return rect;\n}\n\nfunction getClientRectFromMixedType(\n  element: Element,\n  clippingParent: Element | RootBoundary\n): ClientRectObject {\n  return clippingParent === viewport\n    ? rectToClientRect(getViewportRect(element))\n    : isHTMLElement(clippingParent)\n    ? getInnerBoundingClientRect(clippingParent)\n    : rectToClientRect(getDocumentRect(getDocumentElement(element)));\n}\n\n// A \"clipping parent\" is an overflowable container with the characteristic of\n// clipping (or hiding) overflowing elements with a position different from\n// `initial`\nfunction getClippingParents(element: Element): Array<Element> {\n  const clippingParents = listScrollParents(getParentNode(element));\n  const canEscapeClipping =\n    ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;\n  const clipperElement =\n    canEscapeClipping && isHTMLElement(element)\n      ? getOffsetParent(element)\n      : element;\n\n  if (!isElement(clipperElement)) {\n    return [];\n  }\n\n  // $FlowFixMe: https://github.com/facebook/flow/issues/1414\n  return clippingParents.filter(\n    (clippingParent) =>\n      isElement(clippingParent) &&\n      contains(clippingParent, clipperElement) &&\n      getNodeName(clippingParent) !== 'body'\n  );\n}\n\n// Gets the maximum area that the element is visible in due to any number of\n// clipping parents\nexport default function getClippingRect(\n  element: Element,\n  boundary: Boundary,\n  rootBoundary: RootBoundary\n): ClientRectObject {\n  const mainClippingParents =\n    boundary === 'clippingParents'\n      ? getClippingParents(element)\n      : [].concat(boundary);\n  const clippingParents = [...mainClippingParents, rootBoundary];\n  const firstClippingParent = clippingParents[0];\n\n  const clippingRect = clippingParents.reduce((accRect, clippingParent) => {\n    const rect = getClientRectFromMixedType(element, clippingParent);\n\n    accRect.top = Math.max(rect.top, accRect.top);\n    accRect.right = Math.min(rect.right, accRect.right);\n    accRect.bottom = Math.min(rect.bottom, accRect.bottom);\n    accRect.left = Math.max(rect.left, accRect.left);\n\n    return accRect;\n  }, getClientRectFromMixedType(element, firstClippingParent));\n\n  clippingRect.width = clippingRect.right - clippingRect.left;\n  clippingRect.height = clippingRect.bottom - clippingRect.top;\n  clippingRect.x = clippingRect.left;\n  clippingRect.y = clippingRect.top;\n\n  return clippingRect;\n}\n","// @flow\nexport const top: 'top' = 'top';\nexport const bottom: 'bottom' = 'bottom';\nexport const right: 'right' = 'right';\nexport const left: 'left' = 'left';\nexport const auto: 'auto' = 'auto';\nexport type BasePlacement =\n  | typeof top\n  | typeof bottom\n  | typeof right\n  | typeof left;\nexport const basePlacements: Array<BasePlacement> = [top, bottom, right, left];\n\nexport const start: 'start' = 'start';\nexport const end: 'end' = 'end';\nexport type Variation = typeof start | typeof end;\n\nexport const clippingParents: 'clippingParents' = 'clippingParents';\nexport const viewport: 'viewport' = 'viewport';\nexport type Boundary =\n  | HTMLElement\n  | Array<HTMLElement>\n  | typeof clippingParents;\nexport type RootBoundary = typeof viewport | 'document';\n\nexport const popper: 'popper' = 'popper';\nexport const reference: 'reference' = 'reference';\nexport type Context = typeof popper | typeof reference;\n\nexport type VariationPlacement =\n  | 'top-start'\n  | 'top-end'\n  | 'bottom-start'\n  | 'bottom-end'\n  | 'right-start'\n  | 'right-end'\n  | 'left-start'\n  | 'left-end';\nexport type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';\nexport type ComputedPlacement = VariationPlacement | BasePlacement;\nexport type Placement = AutoPlacement | BasePlacement | VariationPlacement;\n\nexport const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(\n  (acc: Array<VariationPlacement>, placement: BasePlacement) =>\n    acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),\n  []\n);\nexport const placements: Array<Placement> = [...basePlacements, auto].reduce(\n  (\n    acc: Array<Placement>,\n    placement: BasePlacement | typeof auto\n  ): Array<Placement> =>\n    acc.concat([\n      placement,\n      (`${placement}-${start}`: any),\n      (`${placement}-${end}`: any),\n    ]),\n  []\n);\n\n// modifiers that need to read the DOM\nexport const beforeRead: 'beforeRead' = 'beforeRead';\nexport const read: 'read' = 'read';\nexport const afterRead: 'afterRead' = 'afterRead';\n// pure-logic modifiers\nexport const beforeMain: 'beforeMain' = 'beforeMain';\nexport const main: 'main' = 'main';\nexport const afterMain: 'afterMain' = 'afterMain';\n// modifier with the purpose to write to the DOM (or write into a framework state)\nexport const beforeWrite: 'beforeWrite' = 'beforeWrite';\nexport const write: 'write' = 'write';\nexport const afterWrite: 'afterWrite' = 'afterWrite';\nexport const modifierPhases: Array<ModifierPhases> = [\n  beforeRead,\n  read,\n  afterRead,\n  beforeMain,\n  main,\n  afterMain,\n  beforeWrite,\n  write,\n  afterWrite,\n];\n\nexport type ModifierPhases =\n  | typeof beforeRead\n  | typeof read\n  | typeof afterRead\n  | typeof beforeMain\n  | typeof main\n  | typeof afterMain\n  | typeof beforeWrite\n  | typeof write\n  | typeof afterWrite;\n","// @flow\nimport getWindow from './getWindow';\nimport getDocumentElement from './getDocumentElement';\nimport getWindowScrollBarX from './getWindowScrollBarX';\n\nexport default function getViewportRect(element: Element) {\n  const win = getWindow(element);\n  const html = getDocumentElement(element);\n  const visualViewport = win.visualViewport;\n\n  let width = html.clientWidth;\n  let height = html.clientHeight;\n  let x = 0;\n  let y = 0;\n\n  // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper\n  // can be obscured underneath it.\n  // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even\n  // if it isn't open, so if this isn't available, the popper will be detected\n  // to overflow the bottom of the screen too early.\n  if (visualViewport) {\n    width = visualViewport.width;\n    height = visualViewport.height;\n\n    // Uses Layout Viewport (like Chrome; Safari does not currently)\n    // In Chrome, it returns a value very close to 0 (+/-) but contains rounding\n    // errors due to floating point numbers, so we need to check precision.\n    // Safari returns a number <= 0, usually < -1 when pinch-zoomed\n\n    // Feature detection fails in mobile emulation mode in Chrome.\n    // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <\n    // 0.001\n    // Fallback here: \"Not Safari\" userAgent\n    if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {\n      x = visualViewport.offsetLeft;\n      y = visualViewport.offsetTop;\n    }\n  }\n\n  return {\n    width,\n    height,\n    x: x + getWindowScrollBarX(element),\n    y,\n  };\n}\n","// @flow\nimport type { Rect } from '../types';\nimport getDocumentElement from './getDocumentElement';\nimport getComputedStyle from './getComputedStyle';\nimport getWindowScrollBarX from './getWindowScrollBarX';\nimport getWindowScroll from './getWindowScroll';\n\n// Gets the entire size of the scrollable document area, even extending outside\n// of the `<html>` and `<body>` rect bounds if horizontally scrollable\nexport default function getDocumentRect(element: HTMLElement): Rect {\n  const html = getDocumentElement(element);\n  const winScroll = getWindowScroll(element);\n  const body = element.ownerDocument.body;\n\n  const width = Math.max(\n    html.scrollWidth,\n    html.clientWidth,\n    body ? body.scrollWidth : 0,\n    body ? body.clientWidth : 0\n  );\n  const height = Math.max(\n    html.scrollHeight,\n    html.clientHeight,\n    body ? body.scrollHeight : 0,\n    body ? body.clientHeight : 0\n  );\n\n  let x = -winScroll.scrollLeft + getWindowScrollBarX(element);\n  const y = -winScroll.scrollTop;\n\n  if (getComputedStyle(body || html).direction === 'rtl') {\n    x += Math.max(html.clientWidth, body ? body.clientWidth : 0) - width;\n  }\n\n  return { width, height, x, y };\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nexport default function getMainAxisFromPlacement(\n  placement: Placement\n): 'x' | 'y' {\n  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';\n}\n","// @flow\nimport getBasePlacement from './getBasePlacement';\nimport getVariation from './getVariation';\nimport getMainAxisFromPlacement from './getMainAxisFromPlacement';\nimport type {\n  Rect,\n  PositioningStrategy,\n  Offsets,\n  ClientRectObject,\n} from '../types';\nimport { top, right, bottom, left, start, end, type Placement } from '../enums';\n\nexport default function computeOffsets({\n  reference,\n  element,\n  placement,\n}: {\n  reference: Rect | ClientRectObject,\n  element: Rect | ClientRectObject,\n  strategy: PositioningStrategy,\n  placement?: Placement,\n}): Offsets {\n  const basePlacement = placement ? getBasePlacement(placement) : null;\n  const variation = placement ? getVariation(placement) : null;\n  const commonX = reference.x + reference.width / 2 - element.width / 2;\n  const commonY = reference.y + reference.height / 2 - element.height / 2;\n\n  let offsets;\n  switch (basePlacement) {\n    case top:\n      offsets = {\n        x: commonX,\n        y: reference.y - element.height,\n      };\n      break;\n    case bottom:\n      offsets = {\n        x: commonX,\n        y: reference.y + reference.height,\n      };\n      break;\n    case right:\n      offsets = {\n        x: reference.x + reference.width,\n        y: commonY,\n      };\n      break;\n    case left:\n      offsets = {\n        x: reference.x - element.width,\n        y: commonY,\n      };\n      break;\n    default:\n      offsets = {\n        x: reference.x,\n        y: reference.y,\n      };\n  }\n\n  const mainAxis = basePlacement\n    ? getMainAxisFromPlacement(basePlacement)\n    : null;\n\n  if (mainAxis != null) {\n    const len = mainAxis === 'y' ? 'height' : 'width';\n\n    switch (variation) {\n      case start:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) -\n          Math.floor(reference[len] / 2 - element[len] / 2);\n        break;\n      case end:\n        offsets[mainAxis] =\n          Math.floor(offsets[mainAxis]) +\n          Math.ceil(reference[len] / 2 - element[len] / 2);\n        break;\n      default:\n    }\n  }\n\n  return offsets;\n}\n","// @flow\nimport { type Variation, type Placement } from '../enums';\n\nexport default function getVariation(placement: Placement): ?Variation {\n  return (placement.split('-')[1]: any);\n}\n","// @flow\nimport type { SideObject } from '../types';\nimport getFreshSideObject from './getFreshSideObject';\n\nexport default function mergePaddingObject(\n  paddingObject: $Shape<SideObject>\n): SideObject {\n  return {\n    ...getFreshSideObject(),\n    ...paddingObject,\n  };\n}\n","// @flow\nimport type { SideObject } from '../types';\n\nexport default function getFreshSideObject(): SideObject {\n  return {\n    top: 0,\n    right: 0,\n    bottom: 0,\n    left: 0,\n  };\n}\n","// @flow\n\nexport default function expandToHashMap<\n  T: number | string | boolean,\n  K: string\n>(value: T, keys: Array<K>): { [key: string]: T } {\n  return keys.reduce((hashMap, key) => {\n    hashMap[key] = value;\n    return hashMap;\n  }, {});\n}\n","// @flow\nimport type { State, SideObject, Padding } from '../types';\nimport type { Placement, Boundary, RootBoundary, Context } from '../enums';\nimport getBoundingClientRect from '../dom-utils/getBoundingClientRect';\nimport getClippingRect from '../dom-utils/getClippingRect';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport computeOffsets from './computeOffsets';\nimport rectToClientRect from './rectToClientRect';\nimport {\n  clippingParents,\n  reference,\n  popper,\n  bottom,\n  top,\n  right,\n  basePlacements,\n  viewport,\n} from '../enums';\nimport { isElement } from '../dom-utils/instanceOf';\nimport mergePaddingObject from './mergePaddingObject';\nimport expandToHashMap from './expandToHashMap';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  placement: Placement,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  elementContext: Context,\n  altBoundary: boolean,\n  padding: Padding,\n};\n\nexport default function detectOverflow(\n  state: State,\n  options: $Shape<Options> = {}\n): SideObject {\n  const {\n    placement = state.placement,\n    boundary = clippingParents,\n    rootBoundary = viewport,\n    elementContext = popper,\n    altBoundary = false,\n    padding = 0,\n  } = options;\n\n  const paddingObject = mergePaddingObject(\n    typeof padding !== 'number'\n      ? padding\n      : expandToHashMap(padding, basePlacements)\n  );\n\n  const altContext = elementContext === popper ? reference : popper;\n\n  const referenceElement = state.elements.reference;\n  const popperRect = state.rects.popper;\n  const element = state.elements[altBoundary ? altContext : elementContext];\n\n  const clippingClientRect = getClippingRect(\n    isElement(element)\n      ? element\n      : element.contextElement || getDocumentElement(state.elements.popper),\n    boundary,\n    rootBoundary\n  );\n\n  const referenceClientRect = getBoundingClientRect(referenceElement);\n\n  const popperOffsets = computeOffsets({\n    reference: referenceClientRect,\n    element: popperRect,\n    strategy: 'absolute',\n    placement,\n  });\n\n  const popperClientRect = rectToClientRect({\n    ...popperRect,\n    ...popperOffsets,\n  });\n\n  const elementClientRect =\n    elementContext === popper ? popperClientRect : referenceClientRect;\n\n  // positive = overflowing the clipping rect\n  // 0 or negative = within the clipping rect\n  const overflowOffsets = {\n    top: clippingClientRect.top - elementClientRect.top + paddingObject.top,\n    bottom:\n      elementClientRect.bottom -\n      clippingClientRect.bottom +\n      paddingObject.bottom,\n    left: clippingClientRect.left - elementClientRect.left + paddingObject.left,\n    right:\n      elementClientRect.right - clippingClientRect.right + paddingObject.right,\n  };\n\n  const offsetData = state.modifiersData.offset;\n\n  // Offsets can be applied only to the popper element\n  if (elementContext === popper && offsetData) {\n    const offset = offsetData[placement];\n\n    Object.keys(overflowOffsets).forEach((key) => {\n      const multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;\n      const axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';\n      overflowOffsets[key] += offset[axis] * multiply;\n    });\n  }\n\n  return overflowOffsets;\n}\n","// @flow\nimport type {\n  State,\n  OptionsGeneric,\n  Modifier,\n  Instance,\n  VirtualElement,\n} from './types';\nimport getCompositeRect from './dom-utils/getCompositeRect';\nimport getLayoutRect from './dom-utils/getLayoutRect';\nimport listScrollParents from './dom-utils/listScrollParents';\nimport getOffsetParent from './dom-utils/getOffsetParent';\nimport getComputedStyle from './dom-utils/getComputedStyle';\nimport orderModifiers from './utils/orderModifiers';\nimport debounce from './utils/debounce';\nimport validateModifiers from './utils/validateModifiers';\nimport uniqueBy from './utils/uniqueBy';\nimport getBasePlacement from './utils/getBasePlacement';\nimport mergeByName from './utils/mergeByName';\nimport detectOverflow from './utils/detectOverflow';\nimport { isElement } from './dom-utils/instanceOf';\nimport { auto } from './enums';\n\nconst INVALID_ELEMENT_ERROR =\n  'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';\nconst INFINITE_LOOP_ERROR =\n  'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';\n\nconst DEFAULT_OPTIONS: OptionsGeneric<any> = {\n  placement: 'bottom',\n  modifiers: [],\n  strategy: 'absolute',\n};\n\ntype PopperGeneratorArgs = {\n  defaultModifiers?: Array<Modifier<any, any>>,\n  defaultOptions?: $Shape<OptionsGeneric<any>>,\n};\n\nfunction areValidElements(...args: Array<any>): boolean {\n  return !args.some(\n    (element) =>\n      !(element && typeof element.getBoundingClientRect === 'function')\n  );\n}\n\nexport function popperGenerator(generatorOptions: PopperGeneratorArgs = {}) {\n  const {\n    defaultModifiers = [],\n    defaultOptions = DEFAULT_OPTIONS,\n  } = generatorOptions;\n\n  return function createPopper<TModifier: $Shape<Modifier<any, any>>>(\n    reference: Element | VirtualElement,\n    popper: HTMLElement,\n    options: $Shape<OptionsGeneric<TModifier>> = defaultOptions\n  ): Instance {\n    let state: $Shape<State> = {\n      placement: 'bottom',\n      orderedModifiers: [],\n      options: { ...DEFAULT_OPTIONS, ...defaultOptions },\n      modifiersData: {},\n      elements: {\n        reference,\n        popper,\n      },\n      attributes: {},\n      styles: {},\n    };\n\n    let effectCleanupFns: Array<() => void> = [];\n    let isDestroyed = false;\n\n    const instance = {\n      state,\n      setOptions(options) {\n        cleanupModifierEffects();\n\n        state.options = {\n          // $FlowFixMe\n          ...defaultOptions,\n          ...state.options,\n          ...options,\n        };\n\n        state.scrollParents = {\n          reference: isElement(reference)\n            ? listScrollParents(reference)\n            : reference.contextElement\n            ? listScrollParents(reference.contextElement)\n            : [],\n          popper: listScrollParents(popper),\n        };\n\n        // Orders the modifiers based on their dependencies and `phase`\n        // properties\n        const orderedModifiers = orderModifiers(\n          mergeByName([...defaultModifiers, ...state.options.modifiers])\n        );\n\n        // Strip out disabled modifiers\n        state.orderedModifiers = orderedModifiers.filter((m) => m.enabled);\n\n        // Validate the provided modifiers so that the consumer will get warned\n        // if one of the modifiers is invalid for any reason\n        if (__DEV__) {\n          const modifiers = uniqueBy(\n            [...orderedModifiers, ...state.options.modifiers],\n            ({ name }) => name\n          );\n\n          validateModifiers(modifiers);\n\n          if (getBasePlacement(state.options.placement) === auto) {\n            const flipModifier = state.orderedModifiers.find(\n              ({ name }) => name === 'flip'\n            );\n\n            if (!flipModifier) {\n              console.error(\n                [\n                  'Popper: \"auto\" placements require the \"flip\" modifier be',\n                  'present and enabled to work.',\n                ].join(' ')\n              );\n            }\n          }\n\n          const {\n            marginTop,\n            marginRight,\n            marginBottom,\n            marginLeft,\n          } = getComputedStyle(popper);\n\n          // We no longer take into account `margins` on the popper, and it can\n          // cause bugs with positioning, so we'll warn the consumer\n          if (\n            [marginTop, marginRight, marginBottom, marginLeft].some((margin) =>\n              parseFloat(margin)\n            )\n          ) {\n            console.warn(\n              [\n                'Popper: CSS \"margin\" styles cannot be used to apply padding',\n                'between the popper and its reference element or boundary.',\n                'To replicate margin, use the `offset` modifier, as well as',\n                'the `padding` option in the `preventOverflow` and `flip`',\n                'modifiers.',\n              ].join(' ')\n            );\n          }\n        }\n\n        runModifierEffects();\n\n        return instance.update();\n      },\n\n      // Sync update – it will always be executed, even if not necessary. This\n      // is useful for low frequency updates where sync behavior simplifies the\n      // logic.\n      // For high frequency updates (e.g. `resize` and `scroll` events), always\n      // prefer the async Popper#update method\n      forceUpdate() {\n        if (isDestroyed) {\n          return;\n        }\n\n        const { reference, popper } = state.elements;\n\n        // Don't proceed if `reference` or `popper` are not valid elements\n        // anymore\n        if (!areValidElements(reference, popper)) {\n          if (__DEV__) {\n            console.error(INVALID_ELEMENT_ERROR);\n          }\n          return;\n        }\n\n        // Store the reference and popper rects to be read by modifiers\n        state.rects = {\n          reference: getCompositeRect(\n            reference,\n            getOffsetParent(popper),\n            state.options.strategy === 'fixed'\n          ),\n          popper: getLayoutRect(popper),\n        };\n\n        // Modifiers have the ability to reset the current update cycle. The\n        // most common use case for this is the `flip` modifier changing the\n        // placement, which then needs to re-run all the modifiers, because the\n        // logic was previously ran for the previous placement and is therefore\n        // stale/incorrect\n        state.reset = false;\n\n        state.placement = state.options.placement;\n\n        // On each update cycle, the `modifiersData` property for each modifier\n        // is filled with the initial data specified by the modifier. This means\n        // it doesn't persist and is fresh on each update.\n        // To ensure persistent data, use `${name}#persistent`\n        state.orderedModifiers.forEach(\n          (modifier) =>\n            (state.modifiersData[modifier.name] = {\n              ...modifier.data,\n            })\n        );\n\n        let __debug_loops__ = 0;\n        for (let index = 0; index < state.orderedModifiers.length; index++) {\n          if (__DEV__) {\n            __debug_loops__ += 1;\n            if (__debug_loops__ > 100) {\n              console.error(INFINITE_LOOP_ERROR);\n              break;\n            }\n          }\n\n          if (state.reset === true) {\n            state.reset = false;\n            index = -1;\n            continue;\n          }\n\n          const { fn, options = {}, name } = state.orderedModifiers[index];\n\n          if (typeof fn === 'function') {\n            state = fn({ state, options, name, instance }) || state;\n          }\n        }\n      },\n\n      // Async and optimistically optimized update – it will not be executed if\n      // not necessary (debounced to run at most once-per-tick)\n      update: debounce<$Shape<State>>(\n        () =>\n          new Promise<$Shape<State>>((resolve) => {\n            instance.forceUpdate();\n            resolve(state);\n          })\n      ),\n\n      destroy() {\n        cleanupModifierEffects();\n        isDestroyed = true;\n      },\n    };\n\n    if (!areValidElements(reference, popper)) {\n      if (__DEV__) {\n        console.error(INVALID_ELEMENT_ERROR);\n      }\n      return instance;\n    }\n\n    instance.setOptions(options).then((state) => {\n      if (!isDestroyed && options.onFirstUpdate) {\n        options.onFirstUpdate(state);\n      }\n    });\n\n    // Modifiers have the ability to execute arbitrary code before the first\n    // update cycle runs. They will be executed in the same order as the update\n    // cycle. This is useful when a modifier adds some persistent data that\n    // other modifiers need to use, but the modifier is run after the dependent\n    // one.\n    function runModifierEffects() {\n      state.orderedModifiers.forEach(({ name, options = {}, effect }) => {\n        if (typeof effect === 'function') {\n          const cleanupFn = effect({ state, name, instance, options });\n          const noopFn = () => {};\n          effectCleanupFns.push(cleanupFn || noopFn);\n        }\n      });\n    }\n\n    function cleanupModifierEffects() {\n      effectCleanupFns.forEach((fn) => fn());\n      effectCleanupFns = [];\n    }\n\n    return instance;\n  };\n}\n\nexport const createPopper = popperGenerator();\n\n// eslint-disable-next-line import/no-unused-modules\nexport { detectOverflow };\n","// @flow\nimport type { Modifier } from '../types';\n\nexport default function mergeByName(\n  modifiers: Array<$Shape<Modifier<any, any>>>\n): Array<$Shape<Modifier<any, any>>> {\n  const merged = modifiers.reduce((merged, current) => {\n    const existing = merged[current.name];\n    merged[current.name] = existing\n      ? {\n          ...existing,\n          ...current,\n          options: { ...existing.options, ...current.options },\n          data: { ...existing.data, ...current.data },\n        }\n      : current;\n    return merged;\n  }, {});\n\n  // IE11 does not support Object.values\n  return Object.keys(merged).map(key => merged[key]);\n}\n","// @flow\nimport type {\n  PositioningStrategy,\n  Offsets,\n  Modifier,\n  ModifierArguments,\n  Rect,\n  Window,\n} from '../types';\nimport { type BasePlacement, top, left, right, bottom } from '../enums';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getWindow from '../dom-utils/getWindow';\nimport getDocumentElement from '../dom-utils/getDocumentElement';\nimport getComputedStyle from '../dom-utils/getComputedStyle';\nimport getBasePlacement from '../utils/getBasePlacement';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n};\n\nconst unsetSides = {\n  top: 'auto',\n  right: 'auto',\n  bottom: 'auto',\n  left: 'auto',\n};\n\n// Round the offsets to the nearest suitable subpixel based on the DPR.\n// Zooming can change the DPR, but it seems to report a value that will\n// cleanly divide the values into the appropriate subpixels.\nfunction roundOffsets({ x, y }): Offsets {\n  const win: Window = window;\n  const dpr = win.devicePixelRatio || 1;\n\n  return {\n    x: Math.round(x * dpr) / dpr || 0,\n    y: Math.round(y * dpr) / dpr || 0,\n  };\n}\n\nexport function mapToStyles({\n  popper,\n  popperRect,\n  placement,\n  offsets,\n  position,\n  gpuAcceleration,\n  adaptive,\n}: {\n  popper: HTMLElement,\n  popperRect: Rect,\n  placement: BasePlacement,\n  offsets: $Shape<{ x: number, y: number, centerOffset: number }>,\n  position: PositioningStrategy,\n  gpuAcceleration: boolean,\n  adaptive: boolean,\n}) {\n  let { x, y } = roundOffsets(offsets);\n\n  const hasX = offsets.hasOwnProperty('x');\n  const hasY = offsets.hasOwnProperty('y');\n\n  let sideX: string = left;\n  let sideY: string = top;\n\n  const win: Window = window;\n\n  if (adaptive) {\n    let offsetParent = getOffsetParent(popper);\n    if (offsetParent === getWindow(popper)) {\n      offsetParent = getDocumentElement(popper);\n    }\n\n    // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it\n    /*:: offsetParent = (offsetParent: Element); */\n\n    if (placement === top) {\n      sideY = bottom;\n      y -= offsetParent.clientHeight - popperRect.height;\n      y *= gpuAcceleration ? 1 : -1;\n    }\n\n    if (placement === left) {\n      sideX = right;\n      x -= offsetParent.clientWidth - popperRect.width;\n      x *= gpuAcceleration ? 1 : -1;\n    }\n  }\n\n  const commonStyles = {\n    position,\n    ...(adaptive && unsetSides),\n  };\n\n  if (gpuAcceleration) {\n    return {\n      ...commonStyles,\n      [sideY]: hasY ? '0' : '',\n      [sideX]: hasX ? '0' : '',\n      // Layer acceleration can disable subpixel rendering which causes slightly\n      // blurry text on low PPI displays, so we want to use 2D transforms\n      // instead\n      transform:\n        (win.devicePixelRatio || 1) < 2\n          ? `translate(${x}px, ${y}px)`\n          : `translate3d(${x}px, ${y}px, 0)`,\n    };\n  }\n\n  return {\n    ...commonStyles,\n    [sideY]: hasY ? `${y}px` : '',\n    [sideX]: hasX ? `${x}px` : '',\n    transform: '',\n  };\n}\n\nfunction computeStyles({ state, options }: ModifierArguments<Options>) {\n  const { gpuAcceleration = true, adaptive = true } = options;\n\n  if (__DEV__) {\n    const transitionProperty =\n      getComputedStyle(state.elements.popper).transitionProperty || '';\n\n    if (\n      adaptive &&\n      ['transform', 'top', 'right', 'bottom', 'left'].some(\n        property => transitionProperty.indexOf(property) >= 0\n      )\n    ) {\n      console.warn(\n        [\n          'Popper: Detected CSS transitions on at least one of the following',\n          'CSS properties: \"transform\", \"top\", \"right\", \"bottom\", \"left\".',\n          '\\n\\n',\n          'Disable the \"computeStyles\" modifier\\'s `adaptive` option to allow',\n          'for smooth transitions, or remove these properties from the CSS',\n          'transition declaration on the popper element if only transitioning',\n          'opacity or background-color for example.',\n          '\\n\\n',\n          'We recommend using the popper element as a wrapper around an inner',\n          'element that can have any CSS property transitioned for animations.',\n        ].join(' ')\n      );\n    }\n  }\n\n  const commonStyles = {\n    placement: getBasePlacement(state.placement),\n    popper: state.elements.popper,\n    popperRect: state.rects.popper,\n    gpuAcceleration,\n  };\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.styles.popper = {\n      ...state.styles.popper,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.popperOffsets,\n        position: state.options.strategy,\n        adaptive,\n      }),\n    };\n  }\n\n  if (state.modifiersData.arrow != null) {\n    state.styles.arrow = {\n      ...state.styles.arrow,\n      ...mapToStyles({\n        ...commonStyles,\n        offsets: state.modifiersData.arrow,\n        position: 'absolute',\n        adaptive: false,\n      }),\n    };\n  }\n\n  state.attributes.popper = {\n    ...state.attributes.popper,\n    'data-popper-placement': state.placement,\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ComputeStylesModifier = Modifier<'computeStyles', Options>;\nexport default ({\n  name: 'computeStyles',\n  enabled: true,\n  phase: 'beforeWrite',\n  fn: computeStyles,\n  data: {},\n}: ComputeStylesModifier);\n","// @flow\nimport type { Placement } from '../enums';\n\nconst hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };\n\nexport default function getOppositePlacement(placement: Placement): Placement {\n  return (placement.replace(\n    /left|right|bottom|top/g,\n    matched => hash[matched]\n  ): any);\n}\n","// @flow\nimport type { Placement } from '../enums';\n\nconst hash = { start: 'end', end: 'start' };\n\nexport default function getOppositeVariationPlacement(\n  placement: Placement\n): Placement {\n  return (placement.replace(/start|end/g, matched => hash[matched]): any);\n}\n","// @flow\nimport type {\n  ModifierArguments,\n  Modifier,\n  Rect,\n  SideObject,\n  Offsets,\n} from '../types';\nimport { top, bottom, left, right } from '../enums';\nimport detectOverflow from '../utils/detectOverflow';\n\nfunction getSideOffsets(\n  overflow: SideObject,\n  rect: Rect,\n  preventedOffsets: Offsets = { x: 0, y: 0 }\n): SideObject {\n  return {\n    top: overflow.top - rect.height - preventedOffsets.y,\n    right: overflow.right - rect.width + preventedOffsets.x,\n    bottom: overflow.bottom - rect.height + preventedOffsets.y,\n    left: overflow.left - rect.width - preventedOffsets.x,\n  };\n}\n\nfunction isAnySideFullyClipped(overflow: SideObject): boolean {\n  return [top, right, bottom, left].some((side) => overflow[side] >= 0);\n}\n\nfunction hide({ state, name }: ModifierArguments<{||}>) {\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n  const preventedOffsets = state.modifiersData.preventOverflow;\n\n  const referenceOverflow = detectOverflow(state, {\n    elementContext: 'reference',\n  });\n  const popperAltOverflow = detectOverflow(state, {\n    altBoundary: true,\n  });\n\n  const referenceClippingOffsets = getSideOffsets(\n    referenceOverflow,\n    referenceRect\n  );\n  const popperEscapeOffsets = getSideOffsets(\n    popperAltOverflow,\n    popperRect,\n    preventedOffsets\n  );\n\n  const isReferenceHidden = isAnySideFullyClipped(referenceClippingOffsets);\n  const hasPopperEscaped = isAnySideFullyClipped(popperEscapeOffsets);\n\n  state.modifiersData[name] = {\n    referenceClippingOffsets,\n    popperEscapeOffsets,\n    isReferenceHidden,\n    hasPopperEscaped,\n  };\n\n  state.attributes.popper = {\n    ...state.attributes.popper,\n    'data-popper-reference-hidden': isReferenceHidden,\n    'data-popper-escaped': hasPopperEscaped,\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type HideModifier = Modifier<'hide', {||}>;\nexport default ({\n  name: 'hide',\n  enabled: true,\n  phase: 'main',\n  requiresIfExists: ['preventOverflow'],\n  fn: hide,\n}: HideModifier);\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport getWindow from '../dom-utils/getWindow';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  scroll: boolean,\n  resize: boolean,\n};\n\nconst passive = { passive: true };\n\nfunction effect({ state, instance, options }: ModifierArguments<Options>) {\n  const { scroll = true, resize = true } = options;\n\n  const window = getWindow(state.elements.popper);\n  const scrollParents = [\n    ...state.scrollParents.reference,\n    ...state.scrollParents.popper,\n  ];\n\n  if (scroll) {\n    scrollParents.forEach(scrollParent => {\n      scrollParent.addEventListener('scroll', instance.update, passive);\n    });\n  }\n\n  if (resize) {\n    window.addEventListener('resize', instance.update, passive);\n  }\n\n  return () => {\n    if (scroll) {\n      scrollParents.forEach(scrollParent => {\n        scrollParent.removeEventListener('scroll', instance.update, passive);\n      });\n    }\n\n    if (resize) {\n      window.removeEventListener('resize', instance.update, passive);\n    }\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type EventListenersModifier = Modifier<'eventListeners', Options>;\nexport default ({\n  name: 'eventListeners',\n  enabled: true,\n  phase: 'write',\n  fn: () => {},\n  effect,\n  data: {},\n}: EventListenersModifier);\n","// @flow\nimport type { ModifierArguments, Modifier } from '../types';\nimport computeOffsets from '../utils/computeOffsets';\n\nfunction popperOffsets({ state, name }: ModifierArguments<{||}>) {\n  // Offsets are the actual position the popper needs to have to be\n  // properly positioned near its reference element\n  // This is the most basic placement, and will be adjusted by\n  // the modifiers in the next step\n  state.modifiersData[name] = computeOffsets({\n    reference: state.rects.reference,\n    element: state.rects.popper,\n    strategy: 'absolute',\n    placement: state.placement,\n  });\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PopperOffsetsModifier = Modifier<'popperOffsets', {||}>;\nexport default ({\n  name: 'popperOffsets',\n  enabled: true,\n  phase: 'read',\n  fn: popperOffsets,\n  data: {},\n}: PopperOffsetsModifier);\n","// @flow\nimport type { Modifier, ModifierArguments } from '../types';\nimport getNodeName from '../dom-utils/getNodeName';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// This modifier takes the styles prepared by the `computeStyles` modifier\n// and applies them to the HTMLElements such as popper and arrow\n\nfunction applyStyles({ state }: ModifierArguments<{||}>) {\n  Object.keys(state.elements).forEach(name => {\n    const style = state.styles[name] || {};\n\n    const attributes = state.attributes[name] || {};\n    const element = state.elements[name];\n\n    // arrow is optional + virtual elements\n    if (!isHTMLElement(element) || !getNodeName(element)) {\n      return;\n    }\n\n    // Flow doesn't support to extend this property, but it's the most\n    // effective way to apply styles to an HTMLElement\n    // $FlowFixMe\n    Object.assign(element.style, style);\n\n    Object.keys(attributes).forEach(name => {\n      const value = attributes[name];\n      if (value === false) {\n        element.removeAttribute(name);\n      } else {\n        element.setAttribute(name, value === true ? '' : value);\n      }\n    });\n  });\n}\n\nfunction effect({ state }: ModifierArguments<{||}>) {\n  const initialStyles = {\n    popper: {\n      position: state.options.strategy,\n      left: '0',\n      top: '0',\n      margin: '0',\n    },\n    arrow: {\n      position: 'absolute',\n    },\n    reference: {},\n  };\n\n  Object.assign(state.elements.popper.style, initialStyles.popper);\n\n  if (state.elements.arrow) {\n    Object.assign(state.elements.arrow.style, initialStyles.arrow);\n  }\n\n  return () => {\n    Object.keys(state.elements).forEach(name => {\n      const element = state.elements[name];\n      const attributes = state.attributes[name] || {};\n\n      const styleProperties = Object.keys(\n        state.styles.hasOwnProperty(name)\n          ? state.styles[name]\n          : initialStyles[name]\n      );\n\n      // Set all values to an empty string to unset them\n      const style = styleProperties.reduce((style, property) => {\n        style[property] = '';\n        return style;\n      }, {});\n\n      // arrow is optional + virtual elements\n      if (!isHTMLElement(element) || !getNodeName(element)) {\n        return;\n      }\n\n      // Flow doesn't support to extend this property, but it's the most\n      // effective way to apply styles to an HTMLElement\n      // $FlowFixMe\n      Object.assign(element.style, style);\n\n      Object.keys(attributes).forEach(attribute => {\n        element.removeAttribute(attribute);\n      });\n    });\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ApplyStylesModifier = Modifier<'applyStyles', {||}>;\nexport default ({\n  name: 'applyStyles',\n  enabled: true,\n  phase: 'write',\n  fn: applyStyles,\n  effect,\n  requires: ['computeStyles'],\n}: ApplyStylesModifier);\n","// @flow\nimport type { Placement } from '../enums';\nimport type { ModifierArguments, Modifier, Rect, Offsets } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport { top, left, right, placements } from '../enums';\n\ntype OffsetsFunction = ({\n  popper: Rect,\n  reference: Rect,\n  placement: Placement,\n}) => [?number, ?number];\n\ntype Offset = OffsetsFunction | [?number, ?number];\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  offset: Offset,\n};\n\nexport function distanceAndSkiddingToXY(\n  placement: Placement,\n  rects: { popper: Rect, reference: Rect },\n  offset: Offset\n): Offsets {\n  const basePlacement = getBasePlacement(placement);\n  const invertDistance = [left, top].indexOf(basePlacement) >= 0 ? -1 : 1;\n\n  let [skidding, distance] =\n    typeof offset === 'function'\n      ? offset({\n          ...rects,\n          placement,\n        })\n      : offset;\n\n  skidding = skidding || 0;\n  distance = (distance || 0) * invertDistance;\n\n  return [left, right].indexOf(basePlacement) >= 0\n    ? { x: distance, y: skidding }\n    : { x: skidding, y: distance };\n}\n\nfunction offset({ state, options, name }: ModifierArguments<Options>) {\n  const { offset = [0, 0] } = options;\n\n  const data = placements.reduce((acc, placement) => {\n    acc[placement] = distanceAndSkiddingToXY(placement, state.rects, offset);\n    return acc;\n  }, {});\n\n  const { x, y } = data[state.placement];\n\n  if (state.modifiersData.popperOffsets != null) {\n    state.modifiersData.popperOffsets.x += x;\n    state.modifiersData.popperOffsets.y += y;\n  }\n\n  state.modifiersData[name] = data;\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type OffsetModifier = Modifier<'offset', Options>;\nexport default ({\n  name: 'offset',\n  enabled: true,\n  phase: 'main',\n  requires: ['popperOffsets'],\n  fn: offset,\n}: OffsetModifier);\n","// @flow\nimport type { Placement, Boundary, RootBoundary } from '../enums';\nimport type { ModifierArguments, Modifier, Padding } from '../types';\nimport getOppositePlacement from '../utils/getOppositePlacement';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getOppositeVariationPlacement from '../utils/getOppositeVariationPlacement';\nimport detectOverflow from '../utils/detectOverflow';\nimport computeAutoPlacement from '../utils/computeAutoPlacement';\nimport { bottom, top, start, right, left, auto } from '../enums';\nimport getVariation from '../utils/getVariation';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  mainAxis: boolean,\n  altAxis: boolean,\n  fallbackPlacements: Array<Placement>,\n  padding: Padding,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  altBoundary: boolean,\n  flipVariations: boolean,\n  allowedAutoPlacements: Array<Placement>,\n};\n\nfunction getExpandedFallbackPlacements(placement: Placement): Array<Placement> {\n  if (getBasePlacement(placement) === auto) {\n    return [];\n  }\n\n  const oppositePlacement = getOppositePlacement(placement);\n\n  return [\n    getOppositeVariationPlacement(placement),\n    oppositePlacement,\n    getOppositeVariationPlacement(oppositePlacement),\n  ];\n}\n\nfunction flip({ state, options, name }: ModifierArguments<Options>) {\n  if (state.modifiersData[name]._skip) {\n    return;\n  }\n\n  const {\n    mainAxis: checkMainAxis = true,\n    altAxis: checkAltAxis = true,\n    fallbackPlacements: specifiedFallbackPlacements,\n    padding,\n    boundary,\n    rootBoundary,\n    altBoundary,\n    flipVariations = true,\n    allowedAutoPlacements,\n  } = options;\n\n  const preferredPlacement = state.options.placement;\n  const basePlacement = getBasePlacement(preferredPlacement);\n  const isBasePlacement = basePlacement === preferredPlacement;\n\n  const fallbackPlacements =\n    specifiedFallbackPlacements ||\n    (isBasePlacement || !flipVariations\n      ? [getOppositePlacement(preferredPlacement)]\n      : getExpandedFallbackPlacements(preferredPlacement));\n\n  const placements = [preferredPlacement, ...fallbackPlacements].reduce(\n    (acc, placement) => {\n      return acc.concat(\n        getBasePlacement(placement) === auto\n          ? computeAutoPlacement(state, {\n              placement,\n              boundary,\n              rootBoundary,\n              padding,\n              flipVariations,\n              allowedAutoPlacements,\n            })\n          : placement\n      );\n    },\n    []\n  );\n\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n\n  const checksMap = new Map();\n  let makeFallbackChecks = true;\n  let firstFittingPlacement = placements[0];\n\n  for (let i = 0; i < placements.length; i++) {\n    const placement = placements[i];\n    const basePlacement = getBasePlacement(placement);\n    const isStartVariation = getVariation(placement) === start;\n    const isVertical = [top, bottom].indexOf(basePlacement) >= 0;\n    const len = isVertical ? 'width' : 'height';\n\n    const overflow = detectOverflow(state, {\n      placement,\n      boundary,\n      rootBoundary,\n      altBoundary,\n      padding,\n    });\n\n    let mainVariationSide: any = isVertical\n      ? isStartVariation\n        ? right\n        : left\n      : isStartVariation\n      ? bottom\n      : top;\n\n    if (referenceRect[len] > popperRect[len]) {\n      mainVariationSide = getOppositePlacement(mainVariationSide);\n    }\n\n    const altVariationSide: any = getOppositePlacement(mainVariationSide);\n\n    const checks = [];\n\n    if (checkMainAxis) {\n      checks.push(overflow[basePlacement] <= 0);\n    }\n\n    if (checkAltAxis) {\n      checks.push(\n        overflow[mainVariationSide] <= 0,\n        overflow[altVariationSide] <= 0\n      );\n    }\n\n    if (checks.every((check) => check)) {\n      firstFittingPlacement = placement;\n      makeFallbackChecks = false;\n      break;\n    }\n\n    checksMap.set(placement, checks);\n  }\n\n  if (makeFallbackChecks) {\n    // `2` may be desired in some cases – research later\n    const numberOfChecks = flipVariations ? 3 : 1;\n\n    for (let i = numberOfChecks; i > 0; i--) {\n      const fittingPlacement = placements.find((placement) => {\n        const checks = checksMap.get(placement);\n        if (checks) {\n          return checks.slice(0, i).every((check) => check);\n        }\n      });\n\n      if (fittingPlacement) {\n        firstFittingPlacement = fittingPlacement;\n        break;\n      }\n    }\n  }\n\n  if (state.placement !== firstFittingPlacement) {\n    state.modifiersData[name]._skip = true;\n    state.placement = firstFittingPlacement;\n    state.reset = true;\n  }\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type FlipModifier = Modifier<'flip', Options>;\nexport default ({\n  name: 'flip',\n  enabled: true,\n  phase: 'main',\n  fn: flip,\n  requiresIfExists: ['offset'],\n  data: { _skip: false },\n}: FlipModifier);\n","// @flow\nimport type { State, Padding } from '../types';\nimport type {\n  Placement,\n  ComputedPlacement,\n  Boundary,\n  RootBoundary,\n} from '../enums';\nimport getVariation from './getVariation';\nimport {\n  variationPlacements,\n  basePlacements,\n  placements as allPlacements,\n} from '../enums';\nimport detectOverflow from './detectOverflow';\nimport getBasePlacement from './getBasePlacement';\n\ntype Options = {\n  placement: Placement,\n  padding: Padding,\n  boundary: Boundary,\n  rootBoundary: RootBoundary,\n  flipVariations: boolean,\n  allowedAutoPlacements?: Array<Placement>,\n};\n\n/*:: type OverflowsMap = { [ComputedPlacement]: number }; */\n/*;; type OverflowsMap = { [key in ComputedPlacement]: number }; */\n\nexport default function computeAutoPlacement(\n  state: $Shape<State>,\n  options: Options = {}\n): Array<ComputedPlacement> {\n  const {\n    placement,\n    boundary,\n    rootBoundary,\n    padding,\n    flipVariations,\n    allowedAutoPlacements = allPlacements,\n  } = options;\n\n  const variation = getVariation(placement);\n\n  const placements = variation\n    ? flipVariations\n      ? variationPlacements\n      : variationPlacements.filter(\n          (placement) => getVariation(placement) === variation\n        )\n    : basePlacements;\n\n  // $FlowFixMe\n  let allowedPlacements = placements.filter(\n    (placement) => allowedAutoPlacements.indexOf(placement) >= 0\n  );\n\n  if (allowedPlacements.length === 0) {\n    allowedPlacements = placements;\n\n    if (__DEV__) {\n      console.error(\n        [\n          'Popper: The `allowedAutoPlacements` option did not allow any',\n          'placements. Ensure the `placement` option matches the variation',\n          'of the allowed placements.',\n          'For example, \"auto\" cannot be used to allow \"bottom-start\".',\n          'Use \"auto-start\" instead.',\n        ].join(' ')\n      );\n    }\n  }\n\n  // $FlowFixMe: Flow seems to have problems with two array unions...\n  const overflows: OverflowsMap = allowedPlacements.reduce((acc, placement) => {\n    acc[placement] = detectOverflow(state, {\n      placement,\n      boundary,\n      rootBoundary,\n      padding,\n    })[getBasePlacement(placement)];\n\n    return acc;\n  }, {});\n\n  return Object.keys(overflows).sort((a, b) => overflows[a] - overflows[b]);\n}\n","// @flow\nimport { top, left, right, bottom, start } from '../enums';\nimport type { Placement, Boundary, RootBoundary } from '../enums';\nimport type { Rect, ModifierArguments, Modifier, Padding } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getMainAxisFromPlacement from '../utils/getMainAxisFromPlacement';\nimport getAltAxis from '../utils/getAltAxis';\nimport within from '../utils/within';\nimport getLayoutRect from '../dom-utils/getLayoutRect';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport detectOverflow from '../utils/detectOverflow';\nimport getVariation from '../utils/getVariation';\nimport getFreshSideObject from '../utils/getFreshSideObject';\n\ntype TetherOffset =\n  | (({\n      popper: Rect,\n      reference: Rect,\n      placement: Placement,\n    }) => number)\n  | number;\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  /* Prevents boundaries overflow on the main axis */\n  mainAxis: boolean,\n  /* Prevents boundaries overflow on the alternate axis */\n  altAxis: boolean,\n  /* The area to check the popper is overflowing in */\n  boundary: Boundary,\n  /* If the popper is not overflowing the main area, fallback to this one */\n  rootBoundary: RootBoundary,\n  /* Use the reference's \"clippingParents\" boundary context */\n  altBoundary: boolean,\n  /**\n   * Allows the popper to overflow from its boundaries to keep it near its\n   * reference element\n   */\n  tether: boolean,\n  /* Offsets when the `tether` option should activate */\n  tetherOffset: TetherOffset,\n  /* Sets a padding to the provided boundary */\n  padding: Padding,\n};\n\nfunction preventOverflow({ state, options, name }: ModifierArguments<Options>) {\n  const {\n    mainAxis: checkMainAxis = true,\n    altAxis: checkAltAxis = false,\n    boundary,\n    rootBoundary,\n    altBoundary,\n    padding,\n    tether = true,\n    tetherOffset = 0,\n  } = options;\n\n  const overflow = detectOverflow(state, {\n    boundary,\n    rootBoundary,\n    padding,\n    altBoundary,\n  });\n  const basePlacement = getBasePlacement(state.placement);\n  const variation = getVariation(state.placement);\n  const isBasePlacement = !variation;\n  const mainAxis = getMainAxisFromPlacement(basePlacement);\n  const altAxis = getAltAxis(mainAxis);\n  const popperOffsets = state.modifiersData.popperOffsets;\n  const referenceRect = state.rects.reference;\n  const popperRect = state.rects.popper;\n  const tetherOffsetValue =\n    typeof tetherOffset === 'function'\n      ? tetherOffset({\n          ...state.rects,\n          placement: state.placement,\n        })\n      : tetherOffset;\n\n  const data = { x: 0, y: 0 };\n\n  if (!popperOffsets) {\n    return;\n  }\n\n  if (checkMainAxis) {\n    const mainSide = mainAxis === 'y' ? top : left;\n    const altSide = mainAxis === 'y' ? bottom : right;\n    const len = mainAxis === 'y' ? 'height' : 'width';\n    const offset = popperOffsets[mainAxis];\n\n    const min = popperOffsets[mainAxis] + overflow[mainSide];\n    const max = popperOffsets[mainAxis] - overflow[altSide];\n\n    const additive = tether ? -popperRect[len] / 2 : 0;\n\n    const minLen = variation === start ? referenceRect[len] : popperRect[len];\n    const maxLen = variation === start ? -popperRect[len] : -referenceRect[len];\n\n    // We need to include the arrow in the calculation so the arrow doesn't go\n    // outside the reference bounds\n    const arrowElement = state.elements.arrow;\n    const arrowRect =\n      tether && arrowElement\n        ? getLayoutRect(arrowElement)\n        : { width: 0, height: 0 };\n    const arrowPaddingObject = state.modifiersData['arrow#persistent']\n      ? state.modifiersData['arrow#persistent'].padding\n      : getFreshSideObject();\n    const arrowPaddingMin = arrowPaddingObject[mainSide];\n    const arrowPaddingMax = arrowPaddingObject[altSide];\n\n    // If the reference length is smaller than the arrow length, we don't want\n    // to include its full size in the calculation. If the reference is small\n    // and near the edge of a boundary, the popper can overflow even if the\n    // reference is not overflowing as well (e.g. virtual elements with no\n    // width or height)\n    const arrowLen = within(0, referenceRect[len], arrowRect[len]);\n\n    const minOffset = isBasePlacement\n      ? referenceRect[len] / 2 -\n        additive -\n        arrowLen -\n        arrowPaddingMin -\n        tetherOffsetValue\n      : minLen - arrowLen - arrowPaddingMin - tetherOffsetValue;\n    const maxOffset = isBasePlacement\n      ? -referenceRect[len] / 2 +\n        additive +\n        arrowLen +\n        arrowPaddingMax +\n        tetherOffsetValue\n      : maxLen + arrowLen + arrowPaddingMax + tetherOffsetValue;\n\n    const arrowOffsetParent =\n      state.elements.arrow && getOffsetParent(state.elements.arrow);\n    const clientOffset = arrowOffsetParent\n      ? mainAxis === 'y'\n        ? arrowOffsetParent.clientTop || 0\n        : arrowOffsetParent.clientLeft || 0\n      : 0;\n\n    const offsetModifierValue = state.modifiersData.offset\n      ? state.modifiersData.offset[state.placement][mainAxis]\n      : 0;\n\n    const tetherMin =\n      popperOffsets[mainAxis] + minOffset - offsetModifierValue - clientOffset;\n    const tetherMax = popperOffsets[mainAxis] + maxOffset - offsetModifierValue;\n\n    const preventedOffset = within(\n      tether ? Math.min(min, tetherMin) : min,\n      offset,\n      tether ? Math.max(max, tetherMax) : max\n    );\n\n    popperOffsets[mainAxis] = preventedOffset;\n    data[mainAxis] = preventedOffset - offset;\n  }\n\n  if (checkAltAxis) {\n    const mainSide = mainAxis === 'x' ? top : left;\n    const altSide = mainAxis === 'x' ? bottom : right;\n    const offset = popperOffsets[altAxis];\n\n    const min = offset + overflow[mainSide];\n    const max = offset - overflow[altSide];\n\n    const preventedOffset = within(min, offset, max);\n\n    popperOffsets[altAxis] = preventedOffset;\n    data[altAxis] = preventedOffset - offset;\n  }\n\n  state.modifiersData[name] = data;\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type PreventOverflowModifier = Modifier<'preventOverflow', Options>;\nexport default ({\n  name: 'preventOverflow',\n  enabled: true,\n  phase: 'main',\n  fn: preventOverflow,\n  requiresIfExists: ['offset'],\n}: PreventOverflowModifier);\n","// @flow\n\nexport default function getAltAxis(axis: 'x' | 'y'): 'x' | 'y' {\n  return axis === 'x' ? 'y' : 'x';\n}\n","// @flow\n\nexport default function within(\n  min: number,\n  value: number,\n  max: number\n): number {\n  return Math.max(min, Math.min(value, max));\n}\n","// @flow\nimport type { Modifier, ModifierArguments, Padding } from '../types';\nimport getBasePlacement from '../utils/getBasePlacement';\nimport getLayoutRect from '../dom-utils/getLayoutRect';\nimport contains from '../dom-utils/contains';\nimport getOffsetParent from '../dom-utils/getOffsetParent';\nimport getMainAxisFromPlacement from '../utils/getMainAxisFromPlacement';\nimport within from '../utils/within';\nimport mergePaddingObject from '../utils/mergePaddingObject';\nimport expandToHashMap from '../utils/expandToHashMap';\nimport { left, right, basePlacements, top, bottom } from '../enums';\nimport { isHTMLElement } from '../dom-utils/instanceOf';\n\n// eslint-disable-next-line import/no-unused-modules\nexport type Options = {\n  element: HTMLElement | string | null,\n  padding: Padding,\n};\n\nfunction arrow({ state, name }: ModifierArguments<Options>) {\n  const arrowElement = state.elements.arrow;\n  const popperOffsets = state.modifiersData.popperOffsets;\n  const basePlacement = getBasePlacement(state.placement);\n  const axis = getMainAxisFromPlacement(basePlacement);\n  const isVertical = [left, right].indexOf(basePlacement) >= 0;\n  const len = isVertical ? 'height' : 'width';\n\n  if (!arrowElement || !popperOffsets) {\n    return;\n  }\n\n  const paddingObject = state.modifiersData[`${name}#persistent`].padding;\n  const arrowRect = getLayoutRect(arrowElement);\n  const minProp = axis === 'y' ? top : left;\n  const maxProp = axis === 'y' ? bottom : right;\n\n  const endDiff =\n    state.rects.reference[len] +\n    state.rects.reference[axis] -\n    popperOffsets[axis] -\n    state.rects.popper[len];\n  const startDiff = popperOffsets[axis] - state.rects.reference[axis];\n\n  const arrowOffsetParent = getOffsetParent(arrowElement);\n  const clientSize = arrowOffsetParent\n    ? axis === 'y'\n      ? arrowOffsetParent.clientHeight || 0\n      : arrowOffsetParent.clientWidth || 0\n    : 0;\n\n  const centerToReference = endDiff / 2 - startDiff / 2;\n\n  // Make sure the arrow doesn't overflow the popper if the center point is\n  // outside of the popper bounds\n  const min = paddingObject[minProp];\n  const max = clientSize - arrowRect[len] - paddingObject[maxProp];\n  const center = clientSize / 2 - arrowRect[len] / 2 + centerToReference;\n  const offset = within(min, center, max);\n\n  // Prevents breaking syntax highlighting...\n  const axisProp: string = axis;\n  state.modifiersData[name] = {\n    [axisProp]: offset,\n    centerOffset: offset - center,\n  };\n}\n\nfunction effect({ state, options, name }: ModifierArguments<Options>) {\n  let { element: arrowElement = '[data-popper-arrow]', padding = 0 } = options;\n\n  if (arrowElement == null) {\n    return;\n  }\n\n  // CSS selector\n  if (typeof arrowElement === 'string') {\n    arrowElement = state.elements.popper.querySelector(arrowElement);\n\n    if (!arrowElement) {\n      return;\n    }\n  }\n\n  if (__DEV__) {\n    if (!isHTMLElement(arrowElement)) {\n      console.error(\n        [\n          'Popper: \"arrow\" element must be an HTMLElement (not an SVGElement).',\n          'To use an SVG arrow, wrap it in an HTMLElement that will be used as',\n          'the arrow.',\n        ].join(' ')\n      );\n    }\n  }\n\n  if (!contains(state.elements.popper, arrowElement)) {\n    if (__DEV__) {\n      console.error(\n        [\n          'Popper: \"arrow\" modifier\\'s `element` must be a child of the popper',\n          'element.',\n        ].join(' ')\n      );\n    }\n\n    return;\n  }\n\n  state.elements.arrow = arrowElement;\n  state.modifiersData[`${name}#persistent`] = {\n    padding: mergePaddingObject(\n      typeof padding !== 'number'\n        ? padding\n        : expandToHashMap(padding, basePlacements)\n    ),\n  };\n}\n\n// eslint-disable-next-line import/no-unused-modules\nexport type ArrowModifier = Modifier<'arrow', Options>;\nexport default ({\n  name: 'arrow',\n  enabled: true,\n  phase: 'main',\n  fn: arrow,\n  effect,\n  requires: ['popperOffsets'],\n  requiresIfExists: ['preventOverflow'],\n}: ArrowModifier);\n","// @flow\nimport { popperGenerator, detectOverflow } from './createPopper';\n\nimport eventListeners from './modifiers/eventListeners';\nimport popperOffsets from './modifiers/popperOffsets';\nimport computeStyles from './modifiers/computeStyles';\nimport applyStyles from './modifiers/applyStyles';\n\nexport type * from './types';\n\nconst defaultModifiers = [\n  eventListeners,\n  popperOffsets,\n  computeStyles,\n  applyStyles,\n];\n\nconst createPopper = popperGenerator({ defaultModifiers });\n\n// eslint-disable-next-line import/no-unused-modules\nexport { createPopper, popperGenerator, defaultModifiers, detectOverflow };\n","// @flow\nimport { popperGenerator, detectOverflow } from './createPopper';\n\nimport eventListeners from './modifiers/eventListeners';\nimport popperOffsets from './modifiers/popperOffsets';\nimport computeStyles from './modifiers/computeStyles';\nimport applyStyles from './modifiers/applyStyles';\nimport offset from './modifiers/offset';\nimport flip from './modifiers/flip';\nimport preventOverflow from './modifiers/preventOverflow';\nimport 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+\ No newline at end of file
author	Daniel Baumann <daniel.baumann@open-infrastructure.net>	2021-10-14 14:59:23 +0000
committer	Daniel Baumann <daniel.baumann@open-infrastructure.net>	2022-01-27 07:04:33 +0000
commit	e7de04494b70ca62ac1abda7f9a3ef41994f4f51 (patch)
tree	78a8387bbe7d9204f2c46a3e5128a7e2e58ba322 /web-tools/web/_static/popperjs
parent	Adding debian packaging. (diff)
download	network-tools-e7de04494b70ca62ac1abda7f9a3ef41994f4f51.tar.xz network-tools-e7de04494b70ca62ac1abda7f9a3ef41994f4f51.zip