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since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n *   console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\n\nvar now = function now() {\n  return root.Date.now();\n};\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\n\n\nfunction debounce(func, wait, options) {\n  var lastArgs,\n      lastThis,\n      maxWait,\n      result,\n      timerId,\n      lastCallTime,\n      lastInvokeTime = 0,\n      leading = false,\n      maxing = false,\n      trailing = true;\n\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n\n  wait = toNumber(wait) || 0;\n\n  if (isObject(options)) {\n    leading = !!options.leading;\n    maxing = 'maxWait' in options;\n    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n    trailing = 'trailing' in options ? !!options.trailing : trailing;\n  }\n\n  function invokeFunc(time) {\n    var args = lastArgs,\n        thisArg = lastThis;\n    lastArgs = lastThis = undefined;\n    lastInvokeTime = time;\n    result = func.apply(thisArg, args);\n    return result;\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time; // Start the timer for the trailing edge.\n\n    timerId = setTimeout(timerExpired, wait); // Invoke the leading edge.\n\n    return leading ? invokeFunc(time) : result;\n  }\n\n  function remainingWait(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime,\n        result = wait - timeSinceLastCall;\n    return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;\n  }\n\n  function shouldInvoke(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime; // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n\n    return lastCallTime === undefined || timeSinceLastCall >= wait || timeSinceLastCall < 0 || maxing && timeSinceLastInvoke >= maxWait;\n  }\n\n  function timerExpired() {\n    var time = now();\n\n    if (shouldInvoke(time)) {\n      return trailingEdge(time);\n    } // Restart the timer.\n\n\n    timerId = setTimeout(timerExpired, remainingWait(time));\n  }\n\n  function trailingEdge(time) {\n    timerId = undefined; // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n\n    if (trailing && lastArgs) {\n      return invokeFunc(time);\n    }\n\n    lastArgs = lastThis = undefined;\n    return result;\n  }\n\n  function cancel() {\n    if (timerId !== undefined) {\n      clearTimeout(timerId);\n    }\n\n    lastInvokeTime = 0;\n    lastArgs = lastCallTime = lastThis = timerId = undefined;\n  }\n\n  function flush() {\n    return timerId === undefined ? result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n\n    return result;\n  }\n\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\n\n\nfunction isObject(value) {\n  var type = typeof value;\n  return !!value && (type == 'object' || type == 'function');\n}\n/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\n\n\nfunction isObjectLike(value) {\n  return !!value && typeof value == 'object';\n}\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\n\n\nfunction isSymbol(value) {\n  return typeof value == 'symbol' || isObjectLike(value) && objectToString.call(value) == symbolTag;\n}\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\n\n\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n\n  if (isSymbol(value)) {\n    return NAN;\n  }\n\n  if (isObject(value)) {\n    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n    value = isObject(other) ? other + '' : other;\n  }\n\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return isBinary || reIsOctal.test(value) ? freeParseInt(value.slice(2), isBinary ? 2 : 8) : reIsBadHex.test(value) ? NAN : +value;\n}\n\nmodule.exports = debounce;","/**\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 (\n    /** @class */\n    function () {\n      function class_1() {\n        this.__entries__ = [];\n      }\n\n      Object.defineProperty(class_1.prototype, \"size\", {\n        /**\r\n         * @returns {boolean}\r\n         */\n        get: function get() {\n          return this.__entries__.length;\n        },\n        enumerable: true,\n        configurable: true\n      });\n      /**\r\n       * @param {*} key\r\n       * @returns {*}\r\n       */\n\n      class_1.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      class_1.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      class_1.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      class_1.prototype.has = function (key) {\n        return !!~getIndex(this.__entries__, key);\n      };\n      /**\r\n       * @returns {void}\r\n       */\n\n\n      class_1.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      class_1.prototype.forEach = function (callback, ctx) {\n        if (ctx === void 0) {\n          ctx = null;\n        }\n\n        for (var _i = 0, _a = this.__entries__; _i < _a.length; _i++) {\n          var entry = _a[_i];\n          callback.call(ctx, entry[1], entry[0]);\n        }\n      };\n\n      return class_1;\n    }()\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\nfunction throttle(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 =\n/** @class */\nfunction () {\n  /**\r\n   * Creates a new instance of ResizeObserverController.\r\n   *\r\n   * @private\r\n   */\n  function ResizeObserverController() {\n    /**\r\n     * Indicates whether DOM listeners have been added.\r\n     *\r\n     * @private {boolean}\r\n     */\n    this.connected_ = false;\n    /**\r\n     * Tells that controller has subscribed for Mutation Events.\r\n     *\r\n     * @private {boolean}\r\n     */\n\n    this.mutationEventsAdded_ = false;\n    /**\r\n     * Keeps reference to the instance of MutationObserver.\r\n     *\r\n     * @private {MutationObserver}\r\n     */\n\n    this.mutationsObserver_ = null;\n    /**\r\n     * A list of connected observers.\r\n     *\r\n     * @private {Array<ResizeObserverSPI>}\r\n     */\n\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\n  ResizeObserverController.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\n  ResizeObserverController.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\n  ResizeObserverController.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\n  ResizeObserverController.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\n  ResizeObserverController.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\n  ResizeObserverController.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\n  ResizeObserverController.prototype.onTransitionEnd_ = function (_a) {\n    var _b = _a.propertyName,\n        propertyName = _b === void 0 ? '' : _b; // 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\n  ResizeObserverController.getInstance = function () {\n    if (!this.instance_) {\n      this.instance_ = new ResizeObserverController();\n    }\n\n    return this.instance_;\n  };\n  /**\r\n   * Holds reference to the controller's instance.\r\n   *\r\n   * @private {ResizeObserverController}\r\n   */\n\n\n  ResizeObserverController.instance_ = null;\n  return ResizeObserverController;\n}();\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\n\nvar defineConfigurable = function defineConfigurable(target, props) {\n  for (var _i = 0, _a = Object.keys(props); _i < _a.length; _i++) {\n    var key = _a[_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 getWindowOf(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\n  for (var _i = 1; _i < arguments.length; _i++) {\n    positions[_i - 1] = arguments[_i];\n  }\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, positions_1 = positions; _i < positions_1.length; _i++) {\n    var position = positions_1[_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      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(_a) {\n  var x = _a.x,\n      y = _a.y,\n      width = _a.width,\n      height = _a.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 =\n/** @class */\nfunction () {\n  /**\r\n   * Creates an instance of ResizeObservation.\r\n   *\r\n   * @param {Element} target - Element to be observed.\r\n   */\n  function ResizeObservation(target) {\n    /**\r\n     * Broadcasted width of content rectangle.\r\n     *\r\n     * @type {number}\r\n     */\n    this.broadcastWidth = 0;\n    /**\r\n     * Broadcasted height of content rectangle.\r\n     *\r\n     * @type {number}\r\n     */\n\n    this.broadcastHeight = 0;\n    /**\r\n     * Reference to the last observed content rectangle.\r\n     *\r\n     * @private {DOMRectInit}\r\n     */\n\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\n  ResizeObservation.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\n  ResizeObservation.prototype.broadcastRect = function () {\n    var rect = this.contentRect_;\n    this.broadcastWidth = rect.width;\n    this.broadcastHeight = rect.height;\n    return rect;\n  };\n\n  return ResizeObservation;\n}();\n\nvar ResizeObserverEntry =\n/** @class */\nfunction () {\n  /**\r\n   * Creates an instance of ResizeObserverEntry.\r\n   *\r\n   * @param {Element} target - Element that is being observed.\r\n   * @param {DOMRectInit} rectInit - Data of the element's content rectangle.\r\n   */\n  function ResizeObserverEntry(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\n  return ResizeObserverEntry;\n}();\n\nvar ResizeObserverSPI =\n/** @class */\nfunction () {\n  /**\r\n   * Creates a new instance of ResizeObserver.\r\n   *\r\n   * @param {ResizeObserverCallback} callback - Callback function that is invoked\r\n   *      when one of the observed elements changes it's content dimensions.\r\n   * @param {ResizeObserverController} controller - Controller instance which\r\n   *      is responsible for the updates of observer.\r\n   * @param {ResizeObserver} callbackCtx - Reference to the public\r\n   *      ResizeObserver instance which will be passed to callback function.\r\n   */\n  function ResizeObserverSPI(callback, controller, callbackCtx) {\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    this.activeObservations_ = [];\n    /**\r\n     * Registry of the ResizeObservation instances.\r\n     *\r\n     * @private {Map<Element, ResizeObservation>}\r\n     */\n\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\n  ResizeObserverSPI.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_; // Do nothing if element is already being observed.\n\n    if (observations.has(target)) {\n      return;\n    }\n\n    observations.set(target, new ResizeObservation(target));\n    this.controller_.addObserver(this); // Force the update of observations.\n\n    this.controller_.refresh();\n  };\n  /**\r\n   * Stops observing provided element.\r\n   *\r\n   * @param {Element} target - Element to stop observing.\r\n   * @returns {void}\r\n   */\n\n\n  ResizeObserverSPI.prototype.unobserve = 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_; // Do nothing if element is not being observed.\n\n    if (!observations.has(target)) {\n      return;\n    }\n\n    observations.delete(target);\n\n    if (!observations.size) {\n      this.controller_.removeObserver(this);\n    }\n  };\n  /**\r\n   * Stops observing all elements.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  ResizeObserverSPI.prototype.disconnect = function () {\n    this.clearActive();\n    this.observations_.clear();\n    this.controller_.removeObserver(this);\n  };\n  /**\r\n   * Collects observation instances the associated element of which has changed\r\n   * it's content rectangle.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  ResizeObserverSPI.prototype.gatherActive = function () {\n    var _this = this;\n\n    this.clearActive();\n    this.observations_.forEach(function (observation) {\n      if (observation.isActive()) {\n        _this.activeObservations_.push(observation);\n      }\n    });\n  };\n  /**\r\n   * Invokes initial callback function with a list of ResizeObserverEntry\r\n   * instances collected from active resize observations.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  ResizeObserverSPI.prototype.broadcastActive = function () {\n    // Do nothing if observer doesn't have active observations.\n    if (!this.hasActive()) {\n      return;\n    }\n\n    var ctx = this.callbackCtx_; // Create ResizeObserverEntry instance for every active observation.\n\n    var entries = this.activeObservations_.map(function (observation) {\n      return new ResizeObserverEntry(observation.target, observation.broadcastRect());\n    });\n    this.callback_.call(ctx, entries, ctx);\n    this.clearActive();\n  };\n  /**\r\n   * Clears the collection of active observations.\r\n   *\r\n   * @returns {void}\r\n   */\n\n\n  ResizeObserverSPI.prototype.clearActive = function () {\n    this.activeObservations_.splice(0);\n  };\n  /**\r\n   * Tells whether observer has active observations.\r\n   *\r\n   * @returns {boolean}\r\n   */\n\n\n  ResizeObserverSPI.prototype.hasActive = function () {\n    return this.activeObservations_.length > 0;\n  };\n\n  return ResizeObserverSPI;\n}(); // Registry of internal observers. If WeakMap is not available use current shim\n// for the Map collection as it has all required methods and because WeakMap\n// can't be fully polyfilled anyway.\n\n\nvar observers = typeof WeakMap !== 'undefined' ? new WeakMap() : new MapShim();\n/**\r\n * ResizeObserver API. Encapsulates the ResizeObserver SPI implementation\r\n * exposing only those methods and properties that are defined in the spec.\r\n */\n\nvar ResizeObserver =\n/** @class */\nfunction () {\n  /**\r\n   * Creates a new instance of ResizeObserver.\r\n   *\r\n   * @param {ResizeObserverCallback} callback - Callback that is invoked when\r\n   *      dimensions of the observed elements change.\r\n   */\n  function ResizeObserver(callback) {\n    if (!(this instanceof ResizeObserver)) {\n      throw new TypeError('Cannot call a class as a function.');\n    }\n\n    if (!arguments.length) {\n      throw new TypeError('1 argument required, but only 0 present.');\n    }\n\n    var controller = ResizeObserverController.getInstance();\n    var observer = new ResizeObserverSPI(callback, controller, this);\n    observers.set(this, observer);\n  }\n\n  return ResizeObserver;\n}(); // Expose public methods of ResizeObserver.\n\n\n['observe', 'unobserve', 'disconnect'].forEach(function (method) {\n  ResizeObserver.prototype[method] = function () {\n    var _a;\n\n    return (_a = observers.get(this))[method].apply(_a, arguments);\n  };\n});\n\nvar index = function () {\n  // Export existing implementation if available.\n  if (typeof global$1.ResizeObserver !== 'undefined') {\n    return global$1.ResizeObserver;\n  }\n\n  return ResizeObserver;\n}();\n\nexport default index;","import _extends from \"@babel/runtime/helpers/esm/extends\";\nimport _objectWithoutPropertiesLoose from \"@babel/runtime/helpers/esm/objectWithoutPropertiesLoose\";\nimport classNames from 'classnames';\nimport React from 'react';\nimport { useBootstrapPrefix } from './ThemeProvider';\nvar DEVICE_SIZES = ['xl', 'lg', 'md', 'sm', 'xs'];\nvar Col = React.forwardRef( // Need to define the default \"as\" during prop destructuring to be compatible with styled-components github.com/react-bootstrap/react-bootstrap/issues/3595\nfunction (_ref, ref) {\n  var bsPrefix = _ref.bsPrefix,\n      className = _ref.className,\n      _ref$as = _ref.as,\n      Component = _ref$as === void 0 ? 'div' : _ref$as,\n      props = _objectWithoutPropertiesLoose(_ref, [\"bsPrefix\", \"className\", \"as\"]);\n\n  var prefix = useBootstrapPrefix(bsPrefix, 'col');\n  var spans = [];\n  var classes = [];\n  DEVICE_SIZES.forEach(function (brkPoint) {\n    var propValue = props[brkPoint];\n    delete props[brkPoint];\n    var span, offset, order;\n\n    if (propValue != null && typeof propValue === 'object') {\n      var _propValue$span = propValue.span;\n      span = _propValue$span === void 0 ? true : _propValue$span;\n      offset = propValue.offset;\n      order = propValue.order;\n    } else {\n      span = propValue;\n    }\n\n    var infix = brkPoint !== 'xs' ? \"-\" + brkPoint : '';\n    if (span != null) spans.push(span === true ? \"\" + prefix + infix : \"\" + prefix + infix + \"-\" + span);\n    if (order != null) classes.push(\"order\" + infix + \"-\" + order);\n    if (offset != null) classes.push(\"offset\" + infix + \"-\" + offset);\n  });\n\n  if (!spans.length) {\n    spans.push(prefix); // plain 'col'\n  }\n\n  return React.createElement(Component, _extends({}, props, {\n    ref: ref,\n    className: classNames.apply(void 0, [className].concat(spans, classes))\n  }));\n});\nCol.displayName = 'Col';\nexport default Col;","import _extends from \"@babel/runtime/helpers/esm/extends\";\nimport _objectWithoutPropertiesLoose from \"@babel/runtime/helpers/esm/objectWithoutPropertiesLoose\";\nimport _inheritsLoose from \"@babel/runtime/helpers/esm/inheritsLoose\";\nimport classNames from 'classnames';\nimport React from 'react';\nimport { createBootstrapComponent } from './ThemeProvider';\n\nvar Row =\n/*#__PURE__*/\nfunction (_React$Component) {\n  _inheritsLoose(Row, _React$Component);\n\n  function Row() {\n    return _React$Component.apply(this, arguments) || this;\n  }\n\n  var _proto = Row.prototype;\n\n  _proto.render = function render() {\n    var _this$props = this.props,\n        bsPrefix = _this$props.bsPrefix,\n        noGutters = _this$props.noGutters,\n        _this$props$as = _this$props.as,\n        Component = _this$props$as === void 0 ? 'div' : _this$props$as,\n        className = _this$props.className,\n        props = _objectWithoutPropertiesLoose(_this$props, [\"bsPrefix\", \"noGutters\", \"as\", \"className\"]);\n\n    return React.createElement(Component, _extends({}, props, {\n      className: classNames(className, bsPrefix, noGutters && 'no-gutters')\n    }));\n  };\n\n  return Row;\n}(React.Component);\n\nRow.defaultProps = {\n  noGutters: false\n};\nexport default createBootstrapComponent(Row, 'row');"],"sourceRoot":""}