koagent/.cache/cb/1ceccd8fca0609d46a92efca479e45.json

{"id":"../node_modules/koagent-client/node_modules/resize-observer-polyfill/dist/ResizeObserver.es.js","dependencies":[{"name":"/Users/xsp/src/js/koalajs/packages/koagent/package.json","includedInParent":true,"mtime":1540990796063},{"name":"/Users/xsp/src/js/koalajs/packages/koagent/node_modules/koagent-client/node_modules/resize-observer-polyfill/package.json","includedInParent":true,"mtime":1540983755605}],"generated":{"js":"var global = arguments[3];\n\"use strict\";\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.default = void 0;\n\n/**\r\n * A collection of shims that provide minimal functionality of the ES6 collections.\r\n *\r\n * These implementations are not meant to be used outside of the ResizeObserver\r\n * modules as they cover only a limited range of use cases.\r\n */\n\n/* eslint-disable require-jsdoc, valid-jsdoc */\nvar MapShim = function () {\n  if (typeof Map !== 'undefined') {\n    return Map;\n  }\n  /**\r\n   * Returns index in provided array that matches the specified key.\r\n   *\r\n   * @param {Array<Array>} arr\r\n   * @param {*} key\r\n   * @returns {number}\r\n   */\n\n\n  function getIndex(arr, key) {\n    var result = -1;\n    arr.some(function (entry, index) {\n      if (entry[0] === key) {\n        result = index;\n        return true;\n      }\n\n      return false;\n    });\n    return result;\n  }\n\n  return function () {\n    function anonymous() {\n      this.__entries__ = [];\n    }\n\n    var prototypeAccessors = {\n      size: {\n        configurable: true\n      }\n    };\n    /**\r\n     * @returns {boolean}\r\n     */\n\n    prototypeAccessors.size.get = function () {\n      return this.__entries__.length;\n    };\n    /**\r\n     * @param {*} key\r\n     * @returns {*}\r\n     */\n\n\n    anonymous.prototype.get = function (key) {\n      var index = getIndex(this.__entries__, key);\n      var entry = this.__entries__[index];\n      return entry && entry[1];\n    };\n    /**\r\n     * @param {*} key\r\n     * @param {*} value\r\n     * @returns {void}\r\n     */\n\n\n    anonymous.prototype.set = function (key, value) {\n      var index = getIndex(this.__entries__, key);\n\n      if (~index) {\n        this.__entries__[index][1] = value;\n      } else {\n        this.__entries__.push([key, value]);\n      }\n    };\n    /**\r\n     * @param {*} key\r\n     * @returns {void}\r\n     */\n\n\n    anonymous.prototype.delete = function (key) {\n      var entries = this.__entries__;\n      var index = getIndex(entries, key);\n\n      if (~index) {\n        entries.splice(index, 1);\n      }\n    };\n    /**\r\n     * @param {*} key\r\n     * @returns {void}\r\n     */\n\n\n    anonymous.prototype.has = function (key) {\n      return !!~getIndex(this.__entries__, key);\n    };\n    /**\r\n     * @returns {void}\r\n     */\n\n\n    anonymous.prototype.clear = function () {\n      this.__entries__.splice(0);\n    };\n    /**\r\n     * @param {Function} callback\r\n     * @param {*} [ctx=null]\r\n     * @returns {void}\r\n     */\n\n\n    anonymous.prototype.forEach = function (callback, ctx) {\n      var this$1 = this;\n      if (ctx === void 0) ctx = null;\n\n      for (var i = 0, list = this$1.__entries__; i < list.length; i += 1) {\n        var entry = list[i];\n        callback.call(ctx, entry[1], entry[0]);\n      }\n    };\n\n    Object.defineProperties(anonymous.prototype, prototypeAccessors);\n    return anonymous;\n  }();\n}();\n/**\r\n * Detects whether window and document objects are available in current environment.\r\n */\n\n\nvar isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && window.document === document; // Returns global object of a current environment.\n\nvar global$1 = function () {\n  if (typeof global !== 'undefined' && global.Math === Math) {\n    return global;\n  }\n\n  if (typeof self !== 'undefined' && self.Math === Math) {\n    return self;\n  }\n\n  if (typeof window !== 'undefined' && window.Math === Math) {\n    return window;\n  } // eslint-disable-next-line no-new-func\n\n\n  return Function('return this')();\n}();\n/**\r\n * A shim for the requestAnimationFrame which falls back to the setTimeout if\r\n * first one is not supported.\r\n *\r\n * @returns {number} Requests' identifier.\r\n */\n\n\nvar requestAnimationFrame$1 = function () {\n  if (typeof requestAnimationFrame === 'function') {\n    // It's required to use a bounded function because IE sometimes throws\n    // an \"Invalid calling object\" error if rAF is invoked without the global\n    // object on the left hand side.\n    return requestAnimationFrame.bind(global$1);\n  }\n\n  return function (callback) {\n    return setTimeout(function () {\n      return callback(Date.now());\n    }, 1000 / 60);\n  };\n}(); // Defines minimum timeout before adding a trailing call.\n\n\nvar trailingTimeout = 2;\n/**\r\n * Creates a wrapper function which ensures that provided callback will be\r\n * invoked only once during the specified delay period.\r\n *\r\n * @param {Function} callback - Function to be invoked after the delay period.\r\n * @param {number} delay - Delay after which to invoke callback.\r\n * @returns {Function}\r\n */\n\nvar throttle = function (callback, delay) {\n  var leadingCall = false,\n      trailingCall = false,\n      lastCallTime = 0;\n  /**\r\n   * Invokes the original callback function and schedules new invocation if\r\n   * the \"proxy\" was called during current request.\r\n   *\r\n   * @returns {void}\r\n   */\n\n  function resolvePending() {\n    if (leadingCall) {\n      leadingCall = false;\n      callback();\n    }\n\n    if (trailingCall) {\n      proxy();\n    }\n  }\n  /**\r\n   * Callback invoked after the specified delay. It will further postpone\r\n   * invocation of the original function delegating it to the\r\n   * requestAnimationFrame.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  function timeoutCallback() {\n    requestAnimationFrame$1(resolvePending);\n  }\n  /**\r\n   * Schedules invocation of the original function.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  function proxy() {\n    var timeStamp = Date.now();\n\n    if (leadingCall) {\n      // Reject immediately following calls.\n      if (timeStamp - lastCallTime < trailingTimeout) {\n        return;\n      } // Schedule new call to be in invoked when the pending one is resolved.\n      // This is important for \"transitions\" which never actually start\n      // immediately so there is a chance that we might miss one if change\n      // happens amids the pending invocation.\n\n\n      trailingCall = true;\n    } else {\n      leadingCall = true;\n      trailingCall = false;\n      setTimeout(timeoutCallback, delay);\n    }\n\n    lastCallTime = timeStamp;\n  }\n\n  return proxy;\n}; // Minimum delay before invoking the update of observers.\n\n\nvar REFRESH_DELAY = 20; // A list of substrings of CSS properties used to find transition events that\n// might affect dimensions of observed elements.\n\nvar transitionKeys = ['top', 'right', 'bottom', 'left', 'width', 'height', 'size', 'weight']; // Check if MutationObserver is available.\n\nvar mutationObserverSupported = typeof MutationObserver !== 'undefined';\n/**\r\n * Singleton controller class which handles updates of ResizeObserver instances.\r\n */\n\nvar ResizeObserverController = function () {\n  this.connected_ = false;\n  this.mutationEventsAdded_ = false;\n  this.mutationsObserver_ = null;\n  this.observers_ = [];\n  this.onTransitionEnd_ = this.onTransitionEnd_.bind(this);\n  this.refresh = throttle(this.refresh.bind(this), REFRESH_DELAY);\n};\n/**\r\n * Adds observer to observers list.\r\n *\r\n * @param {ResizeObserverSPI} observer - Observer to be added.\r\n * @returns {void}\r\n */\n\n/**\r\n * Holds reference to the controller's instance.\r\n *\r\n * @private {ResizeObserverController}\r\n */\n\n/**\r\n * Keeps reference to the instance of MutationObserver.\r\n *\r\n * @private {MutationObserver}\r\n */\n\n/**\r\n * Indicates whether DOM listeners have been added.\r\n *\r\n * @private {boolean}\r\n */\n\n\nResizeObserverController.prototype.addObserver = function (observer) {\n  if (!~this.observers_.indexOf(observer)) {\n    this.observers_.push(observer);\n  } // Add listeners if they haven't been added yet.\n\n\n  if (!this.connected_) {\n    this.connect_();\n  }\n};\n/**\r\n * Removes observer from observers list.\r\n *\r\n * @param {ResizeObserverSPI} observer - Observer to be removed.\r\n * @returns {void}\r\n */\n\n\nResizeObserverController.prototype.removeObserver = function (observer) {\n  var observers = this.observers_;\n  var index = observers.indexOf(observer); // Remove observer if it's present in registry.\n\n  if (~index) {\n    observers.splice(index, 1);\n  } // Remove listeners if controller has no connected observers.\n\n\n  if (!observers.length && this.connected_) {\n    this.disconnect_();\n  }\n};\n/**\r\n * Invokes the update of observers. It will continue running updates insofar\r\n * it detects changes.\r\n *\r\n * @returns {void}\r\n */\n\n\nResizeObserverController.prototype.refresh = function () {\n  var changesDetected = this.updateObservers_(); // Continue running updates if changes have been detected as there might\n  // be future ones caused by CSS transitions.\n\n  if (changesDetected) {\n    this.refresh();\n  }\n};\n/**\r\n * Updates every observer from observers list and notifies them of queued\r\n * entries.\r\n *\r\n * @private\r\n * @returns {boolean} Returns \"true\" if any observer has detected changes in\r\n *  dimensions of it's elements.\r\n */\n\n\nResizeObserverController.prototype.updateObservers_ = function () {\n  // Collect observers that have active observations.\n  var activeObservers = this.observers_.filter(function (observer) {\n    return observer.gatherActive(), observer.hasActive();\n  }); // Deliver notifications in a separate cycle in order to avoid any\n  // collisions between observers, e.g. when multiple instances of\n  // ResizeObserver are tracking the same element and the callback of one\n  // of them changes content dimensions of the observed target. Sometimes\n  // this may result in notifications being blocked for the rest of observers.\n\n  activeObservers.forEach(function (observer) {\n    return observer.broadcastActive();\n  });\n  return activeObservers.length > 0;\n};\n/**\r\n * Initializes DOM listeners.\r\n *\r\n * @private\r\n * @returns {void}\r\n */\n\n\nResizeObserverController.prototype.connect_ = function () {\n  // Do nothing if running in a non-browser environment or if listeners\n  // have been already added.\n  if (!isBrowser || this.connected_) {\n    return;\n  } // Subscription to the \"Transitionend\" event is used as a workaround for\n  // delayed transitions. This way it's possible to capture at least the\n  // final state of an element.\n\n\n  document.addEventListener('transitionend', this.onTransitionEnd_);\n  window.addEventListener('resize', this.refresh);\n\n  if (mutationObserverSupported) {\n    this.mutationsObserver_ = new MutationObserver(this.refresh);\n    this.mutationsObserver_.observe(document, {\n      attributes: true,\n      childList: true,\n      characterData: true,\n      subtree: true\n    });\n  } else {\n    document.addEventListener('DOMSubtreeModified', this.refresh);\n    this.mutationEventsAdded_ = true;\n  }\n\n  this.connected_ = true;\n};\n/**\r\n * Removes DOM listeners.\r\n *\r\n * @private\r\n * @returns {void}\r\n */\n\n\nResizeObserverController.prototype.disconnect_ = function () {\n  // Do nothing if running in a non-browser environment or if listeners\n  // have been already removed.\n  if (!isBrowser || !this.connected_) {\n    return;\n  }\n\n  document.removeEventListener('transitionend', this.onTransitionEnd_);\n  window.removeEventListener('resize', this.refresh);\n\n  if (this.mutationsObserver_) {\n    this.mutationsObserver_.disconnect();\n  }\n\n  if (this.mutationEventsAdded_) {\n    document.removeEventListener('DOMSubtreeModified', this.refresh);\n  }\n\n  this.mutationsObserver_ = null;\n  this.mutationEventsAdded_ = false;\n  this.connected_ = false;\n};\n/**\r\n * \"Transitionend\" event handler.\r\n *\r\n * @private\r\n * @param {TransitionEvent} event\r\n * @returns {void}\r\n */\n\n\nResizeObserverController.prototype.onTransitionEnd_ = function (ref) {\n  var propertyName = ref.propertyName;\n  if (propertyName === void 0) propertyName = ''; // Detect whether transition may affect dimensions of an element.\n\n  var isReflowProperty = transitionKeys.some(function (key) {\n    return !!~propertyName.indexOf(key);\n  });\n\n  if (isReflowProperty) {\n    this.refresh();\n  }\n};\n/**\r\n * Returns instance of the ResizeObserverController.\r\n *\r\n * @returns {ResizeObserverController}\r\n */\n\n\nResizeObserverController.getInstance = function () {\n  if (!this.instance_) {\n    this.instance_ = new ResizeObserverController();\n  }\n\n  return this.instance_;\n};\n\nResizeObserverController.instance_ = null;\n/**\r\n * Defines non-writable/enumerable properties of the provided target object.\r\n *\r\n * @param {Object} target - Object for which to define properties.\r\n * @param {Object} props - Properties to be defined.\r\n * @returns {Object} Target object.\r\n */\n\nvar defineConfigurable = function (target, props) {\n  for (var i = 0, list = Object.keys(props); i < list.length; i += 1) {\n    var key = list[i];\n    Object.defineProperty(target, key, {\n      value: props[key],\n      enumerable: false,\n      writable: false,\n      configurable: true\n    });\n  }\n\n  return target;\n};\n/**\r\n * Returns the global object associated with provided element.\r\n *\r\n * @param {Object} target\r\n * @returns {Object}\r\n */\n\n\nvar getWindowOf = function (target) {\n  // Assume that the element is an instance of Node, which means that it\n  // has the \"ownerDocument\" property from which we can retrieve a\n  // corresponding global object.\n  var ownerGlobal = target && target.ownerDocument && target.ownerDocument.defaultView; // Return the local global object if it's not possible extract one from\n  // provided element.\n\n  return ownerGlobal || global$1;\n}; // Placeholder of an empty content rectangle.\n\n\nvar emptyRect = createRectInit(0, 0, 0, 0);\n/**\r\n * Converts provided string to a number.\r\n *\r\n * @param {number|string} value\r\n * @returns {number}\r\n */\n\nfunction toFloat(value) {\n  return parseFloat(value) || 0;\n}\n/**\r\n * Extracts borders size from provided styles.\r\n *\r\n * @param {CSSStyleDeclaration} styles\r\n * @param {...string} positions - Borders positions (top, right, ...)\r\n * @returns {number}\r\n */\n\n\nfunction getBordersSize(styles) {\n  var positions = [],\n      len = arguments.length - 1;\n\n  while (len-- > 0) positions[len] = arguments[len + 1];\n\n  return positions.reduce(function (size, position) {\n    var value = styles['border-' + position + '-width'];\n    return size + toFloat(value);\n  }, 0);\n}\n/**\r\n * Extracts paddings sizes from provided styles.\r\n *\r\n * @param {CSSStyleDeclaration} styles\r\n * @returns {Object} Paddings box.\r\n */\n\n\nfunction getPaddings(styles) {\n  var positions = ['top', 'right', 'bottom', 'left'];\n  var paddings = {};\n\n  for (var i = 0, list = positions; i < list.length; i += 1) {\n    var position = list[i];\n    var value = styles['padding-' + position];\n    paddings[position] = toFloat(value);\n  }\n\n  return paddings;\n}\n/**\r\n * Calculates content rectangle of provided SVG element.\r\n *\r\n * @param {SVGGraphicsElement} target - Element content rectangle of which needs\r\n *      to be calculated.\r\n * @returns {DOMRectInit}\r\n */\n\n\nfunction getSVGContentRect(target) {\n  var bbox = target.getBBox();\n  return createRectInit(0, 0, bbox.width, bbox.height);\n}\n/**\r\n * Calculates content rectangle of provided HTMLElement.\r\n *\r\n * @param {HTMLElement} target - Element for which to calculate the content rectangle.\r\n * @returns {DOMRectInit}\r\n */\n\n\nfunction getHTMLElementContentRect(target) {\n  // Client width & height properties can't be\n  // used exclusively as they provide rounded values.\n  var clientWidth = target.clientWidth;\n  var clientHeight = target.clientHeight; // By this condition we can catch all non-replaced inline, hidden and\n  // detached elements. Though elements with width & height properties less\n  // than 0.5 will be discarded as well.\n  //\n  // Without it we would need to implement separate methods for each of\n  // those cases and it's not possible to perform a precise and performance\n  // effective test for hidden elements. E.g. even jQuery's ':visible' filter\n  // gives wrong results for elements with width & height less than 0.5.\n\n  if (!clientWidth && !clientHeight) {\n    return emptyRect;\n  }\n\n  var styles = getWindowOf(target).getComputedStyle(target);\n  var paddings = getPaddings(styles);\n  var horizPad = paddings.left + paddings.right;\n  var vertPad = paddings.top + paddings.bottom; // Computed styles of width & height are being used because they are the\n  // only dimensions available to JS that contain non-rounded values. It could\n  // be possible to utilize the getBoundingClientRect if only it's data wasn't\n  // affected by CSS transformations let alone paddings, borders and scroll bars.\n\n  var width = toFloat(styles.width),\n      height = toFloat(styles.height); // Width & height include paddings and borders when the 'border-box' box\n  // model is applied (except for IE).\n\n  if (styles.boxSizing === 'border-box') {\n    // Following conditions are required to handle Internet Explorer which\n    // doesn't include paddings and borders to computed CSS dimensions.\n    //\n    // We can say that if CSS dimensions + paddings are equal to the \"client\"\n    // properties then it's either IE, and thus we don't need to subtract\n    // anything, or an element merely doesn't have paddings/borders styles.\n    if (Math.round(width + horizPad) !== clientWidth) {\n      width -= getBordersSize(styles, 'left', 'right') + horizPad;\n    }\n\n    if (Math.round(height + vertPad) !== clientHeight) {\n      height -= getBordersSize(styles, 'top', 'bottom') + vertPad;\n    }\n  } // Following steps can't be applied to the document's root element as its\n  // client[Width/Height] properties represent viewport area of the window.\n  // Besides, it's as well not necessary as the <html> itself neither has\n  // rendered scroll bars nor it can be clipped.\n\n\n  if (!isDocumentElement(target)) {\n    // In some browsers (only in Firefox, actually) CSS width & height\n    // include scroll bars size which can be removed at this step as scroll\n    // bars are the only difference between rounded dimensions + paddings\n    // and \"client\" properties, though that is not always true in Chrome.\n    var vertScrollbar = Math.round(width + horizPad) - clientWidth;\n    var horizScrollbar = Math.round(height + vertPad) - clientHeight; // Chrome has a rather weird rounding of \"client\" properties.\n    // E.g. for an element with content width of 314.2px it sometimes gives\n    // the client width of 315px and for the width of 314.7px it may give\n    // 314px. And it doesn't happen all the time. So just ignore this delta\n    // as a non-relevant.\n\n    if (Math.abs(vertScrollbar) !== 1) {\n      width -= vertScrollbar;\n    }\n\n    if (Math.abs(horizScrollbar) !== 1) {\n      height -= horizScrollbar;\n    }\n  }\n\n  return createRectInit(paddings.left, paddings.top, width, height);\n}\n/**\r\n * Checks whether provided element is an instance of the SVGGraphicsElement.\r\n *\r\n * @param {Element} target - Element to be checked.\r\n * @returns {boolean}\r\n */\n\n\nvar isSVGGraphicsElement = function () {\n  // Some browsers, namely IE and Edge, don't have the SVGGraphicsElement\n  // interface.\n  if (typeof SVGGraphicsElement !== 'undefined') {\n    return function (target) {\n      return target instanceof getWindowOf(target).SVGGraphicsElement;\n    };\n  } // If it's so, then check that element is at least an instance of the\n  // SVGElement and that it has the \"getBBox\" method.\n  // eslint-disable-next-line no-extra-parens\n\n\n  return function (target) {\n    return target instanceof getWindowOf(target).SVGElement && typeof target.getBBox === 'function';\n  };\n}();\n/**\r\n * Checks whether provided element is a document element (<html>).\r\n *\r\n * @param {Element} target - Element to be checked.\r\n * @returns {boolean}\r\n */\n\n\nfunction isDocumentElement(target) {\n  return target === getWindowOf(target).document.documentElement;\n}\n/**\r\n * Calculates an appropriate content rectangle for provided html or svg element.\r\n *\r\n * @param {Element} target - Element content rectangle of which needs to be calculated.\r\n * @returns {DOMRectInit}\r\n */\n\n\nfunction getContentRect(target) {\n  if (!isBrowser) {\n    return emptyRect;\n  }\n\n  if (isSVGGraphicsElement(target)) {\n    return getSVGContentRect(target);\n  }\n\n  return getHTMLElementContentRect(target);\n}\n/**\r\n * Creates rectangle with an interface of the DOMRectReadOnly.\r\n * Spec: https://drafts.fxtf.org/geometry/#domrectreadonly\r\n *\r\n * @param {DOMRectInit} rectInit - Object with rectangle's x/y coordinates and dimensions.\r\n * @returns {DOMRectReadOnly}\r\n */\n\n\nfunction createReadOnlyRect(ref) {\n  var x = ref.x;\n  var y = ref.y;\n  var width = ref.width;\n  var height = ref.height; // If DOMRectReadOnly is available use it as a prototype for the rectangle.\n\n  var Constr = typeof DOMRectReadOnly !== 'undefined' ? DOMRectReadOnly : Object;\n  var rect = Object.create(Constr.prototype); // Rectangle's properties are not writable and non-enumerable.\n\n  defineConfigurable(rect, {\n    x: x,\n    y: y,\n    width: width,\n    height: height,\n    top: y,\n    right: x + width,\n    bottom: height + y,\n    left: x\n  });\n  return rect;\n}\n/**\r\n * Creates DOMRectInit object based on the provided dimensions and the x/y coordinates.\r\n * Spec: https://drafts.fxtf.org/geometry/#dictdef-domrectinit\r\n *\r\n * @param {number} x - X coordinate.\r\n * @param {number} y - Y coordinate.\r\n * @param {number} width - Rectangle's width.\r\n * @param {number} height - Rectangle's height.\r\n * @returns {DOMRectInit}\r\n */\n\n\nfunction createRectInit(x, y, width, height) {\n  return {\n    x: x,\n    y: y,\n    width: width,\n    height: height\n  };\n}\n/**\r\n * Class that is responsible for computations of the content rectangle of\r\n * provided DOM element and for keeping track of it's changes.\r\n */\n\n\nvar ResizeObservation = function (target) {\n  this.broadcastWidth = 0;\n  this.broadcastHeight = 0;\n  this.contentRect_ = createRectInit(0, 0, 0, 0);\n  this.target = target;\n};\n/**\r\n * Updates content rectangle and tells whether it's width or height properties\r\n * have changed since the last broadcast.\r\n *\r\n * @returns {boolean}\r\n */\n\n/**\r\n * Reference to the last observed content rectangle.\r\n *\r\n * @private {DOMRectInit}\r\n */\n\n/**\r\n * Broadcasted width of content rectangle.\r\n *\r\n * @type {number}\r\n */\n\n\nResizeObservation.prototype.isActive = function () {\n  var rect = getContentRect(this.target);\n  this.contentRect_ = rect;\n  return rect.width !== this.broadcastWidth || rect.height !== this.broadcastHeight;\n};\n/**\r\n * Updates 'broadcastWidth' and 'broadcastHeight' properties with a data\r\n * from the corresponding properties of the last observed content rectangle.\r\n *\r\n * @returns {DOMRectInit} Last observed content rectangle.\r\n */\n\n\nResizeObservation.prototype.broadcastRect = function () {\n  var rect = this.contentRect_;\n  this.broadcastWidth = rect.width;\n  this.broadcastHeight = rect.height;\n  return rect;\n};\n\nvar ResizeObserverEntry = function (target, rectInit) {\n  var contentRect = createReadOnlyRect(rectInit); // According to the specification following properties are not writable\n  // and are also not enumerable in the native implementation.\n  //\n  // Property accessors are not being used as they'd require to define a\n  // private WeakMap storage which may cause memory leaks in browsers that\n  // don't support this type of collections.\n\n  defineConfigurable(this, {\n    target: target,\n    contentRect: contentRect\n  });\n};\n\nvar ResizeObserverSPI = function (callback, controller, callbackCtx) {\n  this.activeObservations_ = [];\n  this.observations_ = new MapShim();\n\n  if (typeof callback !== 'function') {\n    throw new TypeError('The callback provided as parameter 1 is not a function.');\n  }\n\n  this.callback_ = callback;\n  this.controller_ = controller;\n  this.callbackCtx_ = callbackCtx;\n};\n/**\r\n * Starts observing provided element.\r\n *\r\n * @param {Element} target - Element to be observed.\r\n * @returns {void}\r\n */\n\n/**\r\n * Registry of the ResizeObservation instances.\r\n *\r\n * @private {Map<Element, ResizeObservation>}\r\n */\n\n/**\r\n * Public ResizeObserver instance which will be passed to the callback\r\n * function and used as a value of it's \"this\" binding.\r\n *\r\n * @private {ResizeObserver}\r\n */\n\n/**\r\n * Collection of resize observations that have detected changes in dimensions\r\n * of elements.\r\n *\r\n * @private {Array<ResizeObservation>}\r\n */\n\n\nResizeObserverSPI.prototype.observe = function (target) {\n  if (!arguments.length) {\n    throw new TypeError('1 argument required, but only 0 present.');\n  } // Do nothing if current environment doesn't have the Element interface.\n\n\n  if (typeof Element === 'undefined' || !(Element instanceof Object)) {\n    return;\n  }\n\n  if (!(target instanceof getWindowOf(target).Element)) {\n    throw new TypeError('parameter 1 is not of type \"Element\".');\n  }\n\n  var observations = this.observations_; 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