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cheap lodash replacements\nexport function memoize(fn) {\n  var result = null;\n\n  var memoized = function memoized() {\n    if (result == null) {\n      result = fn();\n    }\n\n    return result;\n  };\n\n  return memoized;\n}\n/**\n * drop-in replacement for _.without\n */\n\nexport function without(items, item) {\n  return items.filter(function (i) {\n    return i !== item;\n  });\n}\nexport function union(itemsA, itemsB) {\n  var set = new Set();\n\n  var insertItem = function insertItem(item) {\n    return set.add(item);\n  };\n\n  itemsA.forEach(insertItem);\n  itemsB.forEach(insertItem);\n  var result = [];\n  set.forEach(function (key) {\n    return result.push(key);\n  });\n  return result;\n}","function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nimport { union, without } from './utils/js_utils';\nexport var EnterLeaveCounter = /*#__PURE__*/function () {\n  function EnterLeaveCounter(isNodeInDocument) {\n    _classCallCheck(this, EnterLeaveCounter);\n\n    this.entered = [];\n    this.isNodeInDocument = isNodeInDocument;\n  }\n\n  _createClass(EnterLeaveCounter, [{\n    key: \"enter\",\n    value: function enter(enteringNode) {\n      var _this = this;\n\n      var previousLength = this.entered.length;\n\n      var isNodeEntered = function isNodeEntered(node) {\n        return _this.isNodeInDocument(node) && (!node.contains || node.contains(enteringNode));\n      };\n\n      this.entered = union(this.entered.filter(isNodeEntered), [enteringNode]);\n      return previousLength === 0 && this.entered.length > 0;\n    }\n  }, {\n    key: \"leave\",\n    value: function leave(leavingNode) {\n      var previousLength = this.entered.length;\n      this.entered = without(this.entered.filter(this.isNodeInDocument), leavingNode);\n      return previousLength > 0 && this.entered.length === 0;\n    }\n  }, {\n    key: \"reset\",\n    value: function reset() {\n      this.entered = [];\n    }\n  }]);\n\n  return EnterLeaveCounter;\n}();","import { memoize } from './utils/js_utils';\nexport var isFirefox = memoize(function () {\n  return /firefox/i.test(navigator.userAgent);\n});\nexport var isSafari = memoize(function () {\n  return Boolean(window.safari);\n});","function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nexport var MonotonicInterpolant = /*#__PURE__*/function () {\n  function MonotonicInterpolant(xs, ys) {\n    _classCallCheck(this, MonotonicInterpolant);\n\n    var length = xs.length; // Rearrange xs and ys so that xs is sorted\n\n    var indexes = [];\n\n    for (var i = 0; i < length; i++) {\n      indexes.push(i);\n    }\n\n    indexes.sort(function (a, b) {\n      return xs[a] < xs[b] ? -1 : 1;\n    }); // Get consecutive differences and slopes\n\n    var dys = [];\n    var dxs = [];\n    var ms = [];\n    var dx;\n    var dy;\n\n    for (var _i = 0; _i < length - 1; _i++) {\n      dx = xs[_i + 1] - xs[_i];\n      dy = ys[_i + 1] - ys[_i];\n      dxs.push(dx);\n      dys.push(dy);\n      ms.push(dy / dx);\n    } // Get degree-1 coefficients\n\n\n    var c1s = [ms[0]];\n\n    for (var _i2 = 0; _i2 < dxs.length - 1; _i2++) {\n      var m2 = ms[_i2];\n      var mNext = ms[_i2 + 1];\n\n      if (m2 * mNext <= 0) {\n        c1s.push(0);\n      } else {\n        dx = dxs[_i2];\n        var dxNext = dxs[_i2 + 1];\n        var common = dx + dxNext;\n        c1s.push(3 * common / ((common + dxNext) / m2 + (common + dx) / mNext));\n      }\n    }\n\n    c1s.push(ms[ms.length - 1]); // Get degree-2 and degree-3 coefficients\n\n    var c2s = [];\n    var c3s = [];\n    var m;\n\n    for (var _i3 = 0; _i3 < c1s.length - 1; _i3++) {\n      m = ms[_i3];\n      var c1 = c1s[_i3];\n      var invDx = 1 / dxs[_i3];\n\n    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(xHere > x) {\n          high = mid - 1;\n        } else {\n          return ys[mid];\n        }\n      }\n\n      i = Math.max(0, high); // Interpolate\n\n      var diff = x - xs[i];\n      var diffSq = diff * diff;\n      return ys[i] + c1s[i] * diff + c2s[i] * diffSq + c3s[i] * diff * diffSq;\n    }\n  }]);\n\n  return MonotonicInterpolant;\n}();","import { isSafari, isFirefox } from './BrowserDetector';\nimport { MonotonicInterpolant } from './MonotonicInterpolant';\nvar ELEMENT_NODE = 1;\nexport function getNodeClientOffset(node) {\n  var el = node.nodeType === ELEMENT_NODE ? node : node.parentElement;\n\n  if (!el) {\n    return null;\n  }\n\n  var _el$getBoundingClient = el.getBoundingClientRect(),\n      top = _el$getBoundingClient.top,\n      left = _el$getBoundingClient.left;\n\n  return {\n    x: left,\n    y: top\n  };\n}\nexport function getEventClientOffset(e) {\n  return {\n    x: e.clientX,\n    y: e.clientY\n  };\n}\n\nfunction isImageNode(node) {\n  var _document$documentEle;\n\n  return node.nodeName === 'IMG' && (isFirefox() || !((_document$documentEle = document.documentElement) === null || _document$documentEle === void 0 ? void 0 : _document$documentEle.contains(node)));\n}\n\nfunction getDragPreviewSize(isImage, dragPreview, sourceWidth, sourceHeight) {\n  var dragPreviewWidth = isImage ? dragPreview.width : sourceWidth;\n  var dragPreviewHeight = isImage ? dragPreview.height : sourceHeight; // Work around @2x coordinate discrepancies in browsers\n\n  if (isSafari() && isImage) {\n    dragPreviewHeight /= window.devicePixelRatio;\n    dragPreviewWidth /= window.devicePixelRatio;\n  }\n\n  return {\n    dragPreviewWidth: dragPreviewWidth,\n    dragPreviewHeight: dragPreviewHeight\n  };\n}\n\nexport function getDragPreviewOffset(sourceNode, dragPreview, clientOffset, anchorPoint, offsetPoint) {\n  // The browsers will use the image intrinsic size under different conditions.\n  // Firefox only cares if it's an image, but WebKit also wants it to be detached.\n  var isImage = isImageNode(dragPreview);\n  var dragPreviewNode = isImage ? sourceNode : dragPreview;\n  var dragPreviewNodeOffsetFromClient = getNodeClientOffset(dragPreviewNode);\n  var offsetFromDragPreview = {\n    x: clientOffset.x - dragPreviewNodeOffsetFromClient.x,\n    y: clientOffset.y - dragPreviewNodeOffsetFromClient.y\n  };\n  var sourceWidth = sourceNode.offsetWidth,\n      sourceHeight = sourceNode.offsetHeight;\n  var anchorX = anchorPoint.anchorX,\n      anchorY = anchorPoint.anchorY;\n\n  var _getDragPreviewSize = getDragPreviewSize(isImage, dragPreview, sourceWidth, sourceHeight),\n      dragPreviewWidth = _getDragPreviewSize.dragPreviewWidth,\n      dragPreviewHeight = _getDragPreviewSize.dragPreviewHeight;\n\n  var calculateYOffset = function calculateYOffset() {\n    var interpolantY = new MonotonicInterpolant([0, 0.5, 1], [// Dock to the top\n    offsetFromDragPreview.y, // Align at the center\n    offsetFromDragPreview.y / sourceHeight * dragPreviewHeight, // Dock to the bottom\n    offsetFromDragPreview.y + dragPreviewHeight - sourceHeight]);\n    var y = interpolantY.interpolate(anchorY); // Work around Safari 8 positioning bug\n\n    if (isSafari() && isImage) {\n      // We'll have to wait for @3x to see if this is entirely correct\n      y += (window.devicePixelRatio - 1) * dragPreviewHeight;\n    }\n\n    return y;\n  };\n\n  var calculateXOffset = function calculateXOffset() {\n    // Interpolate coordinates depending on anchor point\n    // If you know a simpler way to do this, let me know\n    var interpolantX = new MonotonicInterpolant([0, 0.5, 1], [// Dock to the left\n    offsetFromDragPreview.x, // Align at the center\n    offsetFromDragPreview.x / sourceWidth * dragPreviewWidth, // Dock to the right\n    offsetFromDragPreview.x + dragPreviewWidth - sourceWidth]);\n    return interpolantX.interpolate(anchorX);\n  }; // Force offsets if specified in the options.\n\n\n  var offsetX = offsetPoint.offsetX,\n      offsetY = offsetPoint.offsetY;\n  var isManualOffsetX = offsetX === 0 || offsetX;\n  var isManualOffsetY = offsetY === 0 || offsetY;\n  return {\n    x: isManualOffsetX ? offsetX : calculateXOffset(),\n    y: isManualOffsetY ? offsetY : calculateYOffset()\n  };\n}","export var FILE = '__NATIVE_FILE__';\nexport var URL = '__NATIVE_URL__';\nexport var TEXT = '__NATIVE_TEXT__';","export function getDataFromDataTransfer(dataTransfer, typesToTry, defaultValue) {\n  var result = typesToTry.reduce(function (resultSoFar, typeToTry) {\n    return resultSoFar || dataTransfer.getData(typeToTry);\n  }, '');\n  return result != null ? result : defaultValue;\n}","var _nativeTypesConfig;\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nimport * as NativeTypes from '../NativeTypes';\nimport { getDataFromDataTransfer } from './getDataFromDataTransfer';\nexport var nativeTypesConfig = (_nativeTypesConfig = {}, _defineProperty(_nativeTypesConfig, NativeTypes.FILE, {\n  exposeProperties: {\n    files: function files(dataTransfer) {\n      return Array.prototype.slice.call(dataTransfer.files);\n    },\n    items: function items(dataTransfer) {\n      return dataTransfer.items;\n    }\n  },\n  matchesTypes: ['Files']\n}), _defineProperty(_nativeTypesConfig, NativeTypes.URL, {\n  exposeProperties: {\n    urls: function urls(dataTransfer, matchesTypes) {\n      return getDataFromDataTransfer(dataTransfer, matchesTypes, '').split('\\n');\n    }\n  },\n  matchesTypes: ['Url', 'text/uri-list']\n}), _defineProperty(_nativeTypesConfig, NativeTypes.TEXT, {\n  exposeProperties: {\n    text: function text(dataTransfer, matchesTypes) {\n      return getDataFromDataTransfer(dataTransfer, matchesTypes, '');\n    }\n  },\n  matchesTypes: ['Text', 'text/plain']\n}), _nativeTypesConfig);","function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nexport var NativeDragSource = /*#__PURE__*/function () {\n  function NativeDragSource(config) {\n    _classCallCheck(this, NativeDragSource);\n\n    this.config = config;\n    this.item = {};\n    this.initializeExposedProperties();\n  }\n\n  _createClass(NativeDragSource, [{\n    key: \"initializeExposedProperties\",\n    value: function initializeExposedProperties() {\n      var _this = this;\n\n      Object.keys(this.config.exposeProperties).forEach(function (property) {\n        Object.defineProperty(_this.item, property, {\n          configurable: true,\n          enumerable: true,\n          get: function get() {\n            // eslint-disable-next-line no-console\n            console.warn(\"Browser doesn't allow reading \\\"\".concat(property, \"\\\" until the drop event.\"));\n            return null;\n          }\n        });\n      });\n    }\n  }, {\n    key: \"loadDataTransfer\",\n    value: function loadDataTransfer(dataTransfer) {\n      var _this2 = this;\n\n      if (dataTransfer) {\n        var newProperties = {};\n        Object.keys(this.config.exposeProperties).forEach(function (property) {\n          newProperties[property] = {\n            value: _this2.config.exposeProperties[property](dataTransfer, _this2.config.matchesTypes),\n            configurable: true,\n            enumerable: true\n          };\n        });\n        Object.defineProperties(this.item, newProperties);\n      }\n    }\n  }, {\n    key: \"canDrag\",\n    value: function canDrag() {\n      return true;\n    }\n  }, {\n    key: \"beginDrag\",\n    value: function beginDrag() {\n      return this.item;\n    }\n  }, {\n    key: \"isDragging\",\n    value: function isDragging(monitor, handle) {\n      return handle === monitor.getSourceId();\n    }\n  }, {\n    key: \"endDrag\",\n    value: function endDrag() {// empty\n    }\n  }]);\n\n  return NativeDragSource;\n}();","import { nativeTypesConfig } from './nativeTypesConfig';\nimport { NativeDragSource } from './NativeDragSource';\nexport function createNativeDragSource(type, dataTransfer) {\n  var result = new NativeDragSource(nativeTypesConfig[type]);\n  result.loadDataTransfer(dataTransfer);\n  return result;\n}\nexport function matchNativeItemType(dataTransfer) {\n  if (!dataTransfer) {\n    return null;\n  }\n\n  var dataTransferTypes = Array.prototype.slice.call(dataTransfer.types || []);\n  return Object.keys(nativeTypesConfig).filter(function (nativeItemType) {\n    var matchesTypes = nativeTypesConfig[nativeItemType].matchesTypes;\n    return matchesTypes.some(function (t) {\n      return dataTransferTypes.indexOf(t) > -1;\n    });\n  })[0] || null;\n}","function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nexport var OptionsReader = /*#__PURE__*/function () {\n  function OptionsReader(globalContext) {\n    _classCallCheck(this, OptionsReader);\n\n    this.globalContext = globalContext;\n  }\n\n  _createClass(OptionsReader, [{\n    key: \"window\",\n    get: function get() {\n      if (this.globalContext) {\n        return this.globalContext;\n      } else if (typeof window !== 'undefined') {\n        return window;\n      }\n\n      return undefined;\n    }\n  }, {\n    key: \"document\",\n    get: function get() {\n      if (this.window) {\n        return this.window.document;\n      }\n\n      return undefined;\n    }\n  }]);\n\n  return OptionsReader;\n}();","function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }\n\nfunction _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nimport { EnterLeaveCounter } from './EnterLeaveCounter';\nimport { isFirefox } from './BrowserDetector';\nimport { getNodeClientOffset, getEventClientOffset, getDragPreviewOffset } from './OffsetUtils';\nimport { createNativeDragSource, matchNativeItemType } from './NativeDragSources';\nimport * as NativeTypes from './NativeTypes';\nimport { OptionsReader } from './OptionsReader';\nexport var HTML5BackendImpl = /*#__PURE__*/function () {\n  function HTML5BackendImpl(manager, globalContext) {\n    var _this = this;\n\n    _classCallCheck(this, HTML5BackendImpl);\n\n    this.sourcePreviewNodes = new Map();\n    this.sourcePreviewNodeOptions = new Map();\n    this.sourceNodes = new Map();\n    this.sourceNodeOptions = new Map();\n    this.dragStartSourceIds = null;\n    this.dropTargetIds = [];\n    this.dragEnterTargetIds = [];\n    this.currentNativeSource = null;\n    this.currentNativeHandle = null;\n    this.currentDragSourceNode = null;\n    this.altKeyPressed = false;\n    this.mouseMoveTimeoutTimer = null;\n    this.asyncEndDragFrameId = null;\n    this.dragOverTargetIds = null;\n\n    this.getSourceClientOffset = function (sourceId) {\n      var source = _this.sourceNodes.get(sourceId);\n\n      return source && getNodeClientOffset(source) || null;\n    };\n\n    this.endDragNativeItem = function () {\n      if (!_this.isDraggingNativeItem()) {\n        return;\n      }\n\n      _this.actions.endDrag();\n\n      if (_this.currentNativeHandle) {\n        _this.registry.removeSource(_this.currentNativeHandle);\n      }\n\n      _this.currentNativeHandle = null;\n      _this.currentNativeSource = null;\n    };\n\n    this.isNodeInDocument = function (node) {\n      // Check the node either in the main document or in the current context\n      return Boolean(node && _this.document && _this.document.body && document.body.contains(node));\n    };\n\n    this.endDragIfSourceWasRemovedFromDOM = function () {\n      var node = _this.currentDragSourceNode;\n\n      if (_this.isNodeInDocument(node)) {\n        return;\n      }\n\n      if (_this.clearCurrentDragSourceNode()) {\n        _this.actions.endDrag();\n      }\n    };\n\n    this.handleTopDragStartCapture = function () {\n      _this.clearCurrentDragSourceNode();\n\n      _this.dragStartSourceIds = [];\n    };\n\n    this.handleTopDragStart = function (e) {\n      if (e.defaultPrevented) {\n        return;\n      }\n\n      var dragStartSourceIds = _this.dragStartSourceIds;\n      _this.dragStartSourceIds = null;\n      var clientOffset = getEventClientOffset(e); // Avoid crashing if we missed a drop event or our previous drag died\n\n      if (_this.monitor.isDragging()) {\n        _this.actions.endDrag();\n      } // Don't publish the source just yet (see why below)\n\n\n      _this.actions.beginDrag(dragStartSourceIds || [], {\n        publishSource: false,\n        getSourceClientOffset: _this.getSourceClientOffset,\n        clientOffset: clientOffset\n      });\n\n      var dataTransfer = e.dataTransfer;\n      var nativeType = matchNativeItemType(dataTransfer);\n\n      if (_this.monitor.isDragging()) {\n        if (dataTransfer && typeof dataTransfer.setDragImage === 'function') {\n          // Use custom drag image if user specifies it.\n          // If child drag source refuses drag but parent agrees,\n          // use parent's node as drag image. Neither works in IE though.\n          var sourceId = _this.monitor.getSourceId();\n\n          var sourceNode = _this.sourceNodes.get(sourceId);\n\n          var dragPreview = _this.sourcePreviewNodes.get(sourceId) || sourceNode;\n\n          if (dragPreview) {\n            var _this$getCurrentSourc = _this.getCurrentSourcePreviewNodeOptions(),\n                anchorX = _this$getCurrentSourc.anchorX,\n                anchorY = _this$getCurrentSourc.anchorY,\n                offsetX = _this$getCurrentSourc.offsetX,\n                offsetY = _this$getCurrentSourc.offsetY;\n\n            var anchorPoint = {\n              anchorX: anchorX,\n              anchorY: anchorY\n            };\n            var offsetPoint = {\n              offsetX: offsetX,\n              offsetY: offsetY\n            };\n            var dragPreviewOffset = getDragPreviewOffset(sourceNode, dragPreview, clientOffset, anchorPoint, offsetPoint);\n            dataTransfer.setDragImage(dragPreview, dragPreviewOffset.x, dragPreviewOffset.y);\n          }\n        }\n\n        try {\n          // Firefox won't drag without setting data\n          dataTransfer === null || dataTransfer === void 0 ? void 0 : dataTransfer.setData('application/json', {});\n        } catch (err) {} // IE doesn't support MIME types in setData\n        // Store drag source node so we can check whether\n        // it is removed from DOM and trigger endDrag manually.\n\n\n        _this.setCurrentDragSourceNode(e.target); // Now we are ready to publish the drag source.. or are we not?\n\n\n        var _this$getCurrentSourc2 = _this.getCurrentSourcePreviewNodeOptions(),\n            captureDraggingState = _this$getCurrentSourc2.captureDraggingState;\n\n        if (!captureDraggingState) {\n          // Usually we want to publish it in the next tick so that browser\n          // is able to screenshot the current (not yet dragging) state.\n          //\n          // It also neatly avoids a situation where render() returns null\n          // in the same tick for the source element, and browser freaks out.\n          setTimeout(function () {\n            return _this.actions.publishDragSource();\n          }, 0);\n        } else {\n          // In some cases the user may want to override this behavior, e.g.\n          // to work around IE not supporting custom drag previews.\n          //\n          // When using a custom drag layer, the only way to prevent\n          // the default drag preview from drawing in IE is to screenshot\n          // the dragging state in which the node itself has zero opacity\n          // and height. In this case, though, returning null from render()\n          // will abruptly end the dragging, which is not obvious.\n          //\n          // This is the reason such behavior is strictly opt-in.\n          _this.actions.publishDragSource();\n        }\n      } else if (nativeType) {\n        // A native item (such as URL) dragged from inside the document\n        _this.beginDragNativeItem(nativeType);\n      } else if (dataTransfer && !dataTransfer.types && (e.target && !e.target.hasAttribute || !e.target.hasAttribute('draggable'))) {\n        // Looks like a Safari bug: dataTransfer.types is null, but there was no draggable.\n        // Just let it drag. It's a native type (URL or text) and will be picked up in\n        // dragenter handler.\n        return;\n      } else {\n        // If by this time no drag source reacted, tell browser not to drag.\n        e.preventDefault();\n      }\n    };\n\n    this.handleTopDragEndCapture = function () {\n      if (_this.clearCurrentDragSourceNode()) {\n        // Firefox can dispatch this event in an infinite loop\n        // if dragend handler does something like showing an alert.\n        // Only proceed if we have not handled it already.\n        _this.actions.endDrag();\n      }\n    };\n\n    this.handleTopDragEnterCapture = function (e) {\n      _this.dragEnterTargetIds = [];\n\n      var isFirstEnter = _this.enterLeaveCounter.enter(e.target);\n\n      if (!isFirstEnter || _this.monitor.isDragging()) {\n        return;\n      }\n\n      var dataTransfer = e.dataTransfer;\n      var nativeType = matchNativeItemType(dataTransfer);\n\n      if (nativeType) {\n        // A native item (such as file or URL) dragged from outside the document\n        _this.beginDragNativeItem(nativeType, dataTransfer);\n      }\n    };\n\n    this.handleTopDragEnter = function (e) {\n      var dragEnterTargetIds = _this.dragEnterTargetIds;\n      _this.dragEnterTargetIds = [];\n\n      if (!_this.monitor.isDragging()) {\n        // This is probably a native item type we don't understand.\n        return;\n      }\n\n      _this.altKeyPressed = e.altKey;\n\n      if (!isFirefox()) {\n        // Don't emit hover in `dragenter` on Firefox due to an edge case.\n        // If the target changes position as the result of `dragenter`, Firefox\n        // will still happily dispatch `dragover` despite target being no longer\n        // there. The easy solution is to only fire `hover` in `dragover` on FF.\n        _this.actions.hover(dragEnterTargetIds, {\n          clientOffset: getEventClientOffset(e)\n        });\n      }\n\n      var canDrop = dragEnterTargetIds.some(function (targetId) {\n        return _this.monitor.canDropOnTarget(targetId);\n      });\n\n      if (canDrop) {\n        // IE requires this to fire dragover events\n        e.preventDefault();\n\n        if (e.dataTransfer) {\n          e.dataTransfer.dropEffect = _this.getCurrentDropEffect();\n        }\n      }\n    };\n\n    this.handleTopDragOverCapture = function () {\n      _this.dragOverTargetIds = [];\n    };\n\n    this.handleTopDragOver = function (e) {\n      var dragOverTargetIds = _this.dragOverTargetIds;\n      _this.dragOverTargetIds = [];\n\n      if (!_this.monitor.isDragging()) {\n        // This is probably a native item type we don't understand.\n        // Prevent default \"drop and blow away the whole document\" action.\n        e.preventDefault();\n\n        if (e.dataTransfer) {\n          e.dataTransfer.dropEffect = 'none';\n        }\n\n        return;\n      }\n\n      _this.altKeyPressed = e.altKey;\n\n      _this.actions.hover(dragOverTargetIds || [], {\n        clientOffset: getEventClientOffset(e)\n      });\n\n      var canDrop = (dragOverTargetIds || []).some(function (targetId) {\n        return _this.monitor.canDropOnTarget(targetId);\n      });\n\n      if (canDrop) {\n        // Show user-specified drop effect.\n        e.preventDefault();\n\n        if (e.dataTransfer) {\n          e.dataTransfer.dropEffect = _this.getCurrentDropEffect();\n        }\n      } else if (_this.isDraggingNativeItem()) {\n        // Don't show a nice cursor but still prevent default\n        // \"drop and blow away the whole document\" action.\n        e.preventDefault();\n      } else {\n        e.preventDefault();\n\n        if (e.dataTransfer) {\n          e.dataTransfer.dropEffect = 'none';\n        }\n      }\n    };\n\n    this.handleTopDragLeaveCapture = function (e) {\n      if (_this.isDraggingNativeItem()) {\n        e.preventDefault();\n      }\n\n      var isLastLeave = _this.enterLeaveCounter.leave(e.target);\n\n      if (!isLastLeave) {\n        return;\n      }\n\n      if (_this.isDraggingNativeItem()) {\n        _this.endDragNativeItem();\n      }\n    };\n\n    this.handleTopDropCapture = function (e) {\n      _this.dropTargetIds = [];\n      e.preventDefault();\n\n      if (_this.isDraggingNativeItem()) {\n        var _this$currentNativeSo;\n\n        (_this$currentNativeSo = _this.currentNativeSource) === null || _this$currentNativeSo === void 0 ? void 0 : _this$currentNativeSo.loadDataTransfer(e.dataTransfer);\n      }\n\n      _this.enterLeaveCounter.reset();\n    };\n\n    this.handleTopDrop = function (e) {\n      var dropTargetIds = _this.dropTargetIds;\n      _this.dropTargetIds = [];\n\n      _this.actions.hover(dropTargetIds, {\n        clientOffset: getEventClientOffset(e)\n      });\n\n      _this.actions.drop({\n        dropEffect: _this.getCurrentDropEffect()\n      });\n\n      if (_this.isDraggingNativeItem()) {\n        _this.endDragNativeItem();\n      } else {\n        _this.endDragIfSourceWasRemovedFromDOM();\n      }\n    };\n\n    this.handleSelectStart = function (e) {\n      var target = e.target; // Only IE requires us to explicitly say\n      // we want drag drop operation to start\n\n      if (typeof target.dragDrop !== 'function') {\n        return;\n      } // Inputs and textareas should be selectable\n\n\n      if (target.tagName === 'INPUT' || target.tagName === 'SELECT' || target.tagName === 'TEXTAREA' || target.isContentEditable) {\n        return;\n      } // For other targets, ask IE\n      // to enable drag and drop\n\n\n      e.preventDefault();\n      target.dragDrop();\n    };\n\n    this.options = new OptionsReader(globalContext);\n    this.actions = manager.getActions();\n    this.monitor = manager.getMonitor();\n    this.registry = manager.getRegistry();\n    this.enterLeaveCounter = new EnterLeaveCounter(this.isNodeInDocument);\n  }\n  /**\n   * Generate profiling statistics for the HTML5Backend.\n   */\n\n\n  _createClass(HTML5BackendImpl, [{\n    key: \"profile\",\n    value: function profile() {\n      var _this$dragStartSource, _this$dragOverTargetI;\n\n      return {\n        sourcePreviewNodes: this.sourcePreviewNodes.size,\n        sourcePreviewNodeOptions: this.sourcePreviewNodeOptions.size,\n        sourceNodeOptions: this.sourceNodeOptions.size,\n        sourceNodes: this.sourceNodes.size,\n        dragStartSourceIds: ((_this$dragStartSource = this.dragStartSourceIds) === null || _this$dragStartSource === void 0 ? void 0 : _this$dragStartSource.length) || 0,\n        dropTargetIds: this.dropTargetIds.length,\n        dragEnterTargetIds: this.dragEnterTargetIds.length,\n        dragOverTargetIds: ((_this$dragOverTargetI = this.dragOverTargetIds) === null || _this$dragOverTargetI === void 0 ? void 0 : _this$dragOverTargetI.length) || 0\n      };\n    } // public for test\n\n  }, {\n    key: \"setup\",\n    value: function setup() {\n      if (this.window === undefined) {\n        return;\n      }\n\n      if (this.window.__isReactDndBackendSetUp) {\n        throw new Error('Cannot have two HTML5 backends at the same time.');\n      }\n\n      this.window.__isReactDndBackendSetUp = true;\n      this.addEventListeners(this.window);\n    }\n  }, {\n    key: \"teardown\",\n    value: function teardown() {\n      if (this.window === undefined) {\n        return;\n      }\n\n      this.window.__isReactDndBackendSetUp = false;\n      this.removeEventListeners(this.window);\n      this.clearCurrentDragSourceNode();\n\n      if (this.asyncEndDragFrameId) {\n        this.window.cancelAnimationFrame(this.asyncEndDragFrameId);\n      }\n    }\n  }, {\n    key: \"connectDragPreview\",\n    value: function connectDragPreview(sourceId, node, options) {\n      var _this2 = this;\n\n      this.sourcePreviewNodeOptions.set(sourceId, options);\n      this.sourcePreviewNodes.set(sourceId, node);\n      return function () {\n        _this2.sourcePreviewNodes.delete(sourceId);\n\n        _this2.sourcePreviewNodeOptions.delete(sourceId);\n      };\n    }\n  }, {\n    key: \"connectDragSource\",\n    value: function connectDragSource(sourceId, node, options) {\n      var _this3 = this;\n\n      this.sourceNodes.set(sourceId, node);\n      this.sourceNodeOptions.set(sourceId, options);\n\n      var handleDragStart = function handleDragStart(e) {\n        return _this3.handleDragStart(e, sourceId);\n      };\n\n      var handleSelectStart = function handleSelectStart(e) {\n        return _this3.handleSelectStart(e);\n      };\n\n      node.setAttribute('draggable', 'true');\n      node.addEventListener('dragstart', handleDragStart);\n      node.addEventListener('selectstart', handleSelectStart);\n      return function () {\n        _this3.sourceNodes.delete(sourceId);\n\n        _this3.sourceNodeOptions.delete(sourceId);\n\n        node.removeEventListener('dragstart', handleDragStart);\n        node.removeEventListener('selectstart', handleSelectStart);\n        node.setAttribute('draggable', 'false');\n      };\n    }\n  }, {\n    key: \"connectDropTarget\",\n    value: function connectDropTarget(targetId, node) {\n      var _this4 = this;\n\n      var handleDragEnter = function handleDragEnter(e) {\n        return _this4.handleDragEnter(e, targetId);\n      };\n\n      var handleDragOver = function handleDragOver(e) {\n        return _this4.handleDragOver(e, targetId);\n      };\n\n      var handleDrop = function handleDrop(e) {\n        return _this4.handleDrop(e, targetId);\n      };\n\n      node.addEventListener('dragenter', handleDragEnter);\n      node.addEventListener('dragover', handleDragOver);\n      node.addEventListener('drop', handleDrop);\n      return function () {\n        node.removeEventListener('dragenter', handleDragEnter);\n        node.removeEventListener('dragover', handleDragOver);\n        node.removeEventListener('drop', handleDrop);\n      };\n    }\n  }, {\n    key: \"addEventListeners\",\n    value: function addEventListeners(target) {\n      // SSR Fix (https://github.com/react-dnd/react-dnd/pull/813\n      if (!target.addEventListener) {\n        return;\n      }\n\n      target.addEventListener('dragstart', this.handleTopDragStart);\n      target.addEventListener('dragstart', this.handleTopDragStartCapture, true);\n      target.addEventListener('dragend', this.handleTopDragEndCapture, true);\n      target.addEventListener('dragenter', this.handleTopDragEnter);\n      target.addEventListener('dragenter', this.handleTopDragEnterCapture, true);\n      target.addEventListener('dragleave', this.handleTopDragLeaveCapture, true);\n      target.addEventListener('dragover', this.handleTopDragOver);\n      target.addEventListener('dragover', this.handleTopDragOverCapture, true);\n      target.addEventListener('drop', this.handleTopDrop);\n      target.addEventListener('drop', this.handleTopDropCapture, true);\n    }\n  }, {\n    key: \"removeEventListeners\",\n    value: function removeEventListeners(target) {\n      // SSR Fix (https://github.com/react-dnd/react-dnd/pull/813\n      if (!target.removeEventListener) {\n        return;\n      }\n\n      target.removeEventListener('dragstart', this.handleTopDragStart);\n      target.removeEventListener('dragstart', this.handleTopDragStartCapture, true);\n      target.removeEventListener('dragend', this.handleTopDragEndCapture, true);\n      target.removeEventListener('dragenter', this.handleTopDragEnter);\n      target.removeEventListener('dragenter', this.handleTopDragEnterCapture, true);\n      target.removeEventListener('dragleave', this.handleTopDragLeaveCapture, true);\n      target.removeEventListener('dragover', this.handleTopDragOver);\n      target.removeEventListener('dragover', this.handleTopDragOverCapture, true);\n      target.removeEventListener('drop', this.handleTopDrop);\n      target.removeEventListener('drop', this.handleTopDropCapture, true);\n    }\n  }, {\n    key: \"getCurrentSourceNodeOptions\",\n    value: function getCurrentSourceNodeOptions() {\n      var sourceId = this.monitor.getSourceId();\n      var sourceNodeOptions = this.sourceNodeOptions.get(sourceId);\n      return _objectSpread({\n        dropEffect: this.altKeyPressed ? 'copy' : 'move'\n      }, sourceNodeOptions || {});\n    }\n  }, {\n    key: \"getCurrentDropEffect\",\n    value: function getCurrentDropEffect() {\n      if (this.isDraggingNativeItem()) {\n        // It makes more sense to default to 'copy' for native resources\n        return 'copy';\n      }\n\n      return this.getCurrentSourceNodeOptions().dropEffect;\n    }\n  }, {\n    key: \"getCurrentSourcePreviewNodeOptions\",\n    value: function getCurrentSourcePreviewNodeOptions() {\n      var sourceId = this.monitor.getSourceId();\n      var sourcePreviewNodeOptions = this.sourcePreviewNodeOptions.get(sourceId);\n      return _objectSpread({\n        anchorX: 0.5,\n        anchorY: 0.5,\n        captureDraggingState: false\n      }, sourcePreviewNodeOptions || {});\n    }\n  }, {\n    key: \"isDraggingNativeItem\",\n    value: function isDraggingNativeItem() {\n      var itemType = this.monitor.getItemType();\n      return Object.keys(NativeTypes).some(function (key) {\n        return NativeTypes[key] === itemType;\n      });\n    }\n  }, {\n    key: \"beginDragNativeItem\",\n    value: function beginDragNativeItem(type, dataTransfer) {\n      this.clearCurrentDragSourceNode();\n      this.currentNativeSource = createNativeDragSource(type, dataTransfer);\n      this.currentNativeHandle = this.registry.addSource(type, this.currentNativeSource);\n      this.actions.beginDrag([this.currentNativeHandle]);\n    }\n  }, {\n    key: \"setCurrentDragSourceNode\",\n    value: function setCurrentDragSourceNode(node) {\n      var _this5 = this;\n\n      this.clearCurrentDragSourceNode();\n      this.currentDragSourceNode = node; // A timeout of > 0 is necessary to resolve Firefox issue referenced\n      // See:\n      //   * https://github.com/react-dnd/react-dnd/pull/928\n      //   * https://github.com/react-dnd/react-dnd/issues/869\n\n      var MOUSE_MOVE_TIMEOUT = 1000; // Receiving a mouse event in the middle of a dragging operation\n      // means it has ended and the drag source node disappeared from DOM,\n      // so the browser didn't dispatch the dragend event.\n      //\n      // We need to wait before we start listening for mousemove events.\n      // This is needed because the drag preview needs to be drawn or else it fires an 'mousemove' event\n      // immediately in some browsers.\n      //\n      // See:\n      //   * https://github.com/react-dnd/react-dnd/pull/928\n      //   * https://github.com/react-dnd/react-dnd/issues/869\n      //\n\n      this.mouseMoveTimeoutTimer = setTimeout(function () {\n        return _this5.window && _this5.window.addEventListener('mousemove', _this5.endDragIfSourceWasRemovedFromDOM, true);\n      }, MOUSE_MOVE_TIMEOUT);\n    }\n  }, {\n    key: \"clearCurrentDragSourceNode\",\n    value: function clearCurrentDragSourceNode() {\n      if (this.currentDragSourceNode) {\n        this.currentDragSourceNode = null;\n\n        if (this.window) {\n          this.window.clearTimeout(this.mouseMoveTimeoutTimer || undefined);\n          this.window.removeEventListener('mousemove', this.endDragIfSourceWasRemovedFromDOM, true);\n        }\n\n        this.mouseMoveTimeoutTimer = null;\n        return true;\n      }\n\n      return false;\n    }\n  }, {\n    key: \"handleDragStart\",\n    value: function handleDragStart(e, sourceId) {\n      if (e.defaultPrevented) {\n        return;\n      }\n\n      if (!this.dragStartSourceIds) {\n        this.dragStartSourceIds = [];\n      }\n\n      this.dragStartSourceIds.unshift(sourceId);\n    }\n  }, {\n    key: \"handleDragEnter\",\n    value: function handleDragEnter(e, targetId) {\n      this.dragEnterTargetIds.unshift(targetId);\n    }\n  }, {\n    key: \"handleDragOver\",\n    value: function handleDragOver(e, targetId) {\n      if (this.dragOverTargetIds === null) {\n        this.dragOverTargetIds = [];\n      }\n\n      this.dragOverTargetIds.unshift(targetId);\n    }\n  }, {\n    key: \"handleDrop\",\n    value: function handleDrop(e, targetId) {\n      this.dropTargetIds.unshift(targetId);\n    }\n  }, {\n    key: \"window\",\n    get: function get() {\n      return this.options.window;\n    }\n  }, {\n    key: \"document\",\n    get: function get() {\n      return this.options.document;\n    }\n  }]);\n\n  return HTML5BackendImpl;\n}();","var emptyImage;\nexport function getEmptyImage() {\n  if (!emptyImage) {\n    emptyImage = new Image();\n    emptyImage.src = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';\n  }\n\n  return emptyImage;\n}","import { HTML5BackendImpl } from './HTML5BackendImpl';\nimport * as NativeTypes from './NativeTypes';\nexport { getEmptyImage } from './getEmptyImage';\nexport { NativeTypes };\nexport var HTML5Backend = function createBackend(manager, context) {\n  return new HTML5BackendImpl(manager, context);\n};"],"sourceRoot":""}