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React from 'react';\nimport { addEventListener } from 'consolidated-events';\nimport PropTypes from 'prop-types';\nimport { isForwardRef } from 'react-is';\n\n/**\n * Attempts to parse the offset provided as a prop as a percentage. For\n * instance, if the component has been provided with the string \"20%\" as\n * a value of one of the offset props. If the value matches, then it returns\n * a numeric version of the prop. For instance, \"20%\" would become `0.2`.\n * If `str` isn't a percentage, then `undefined` will be returned.\n *\n * @param {string} str The value of an offset prop to be converted to a\n *   number.\n * @return {number|undefined} The numeric version of `str`. Undefined if `str`\n *   was not a percentage.\n */\nfunction parseOffsetAsPercentage(str) {\n  if (str.slice(-1) === '%') {\n    return parseFloat(str.slice(0, -1)) / 100;\n  }\n}\n\n/**\n * Attempts to parse the offset provided as a prop as a pixel value. If\n * parsing fails, then `undefined` is returned. Three examples of values that\n * will be successfully parsed are:\n * `20`\n * \"20px\"\n * \"20\"\n *\n * @param {string|number} str A string of the form \"{number}\" or \"{number}px\",\n *   or just a number.\n * @return {number|undefined} The numeric version of `str`. Undefined if `str`\n *   was neither a number nor string ending in \"px\".\n */\nfunction parseOffsetAsPixels(str) {\n  if (!isNaN(parseFloat(str)) && isFinite(str)) {\n    return parseFloat(str);\n  } else if (str.slice(-2) === 'px') {\n    return parseFloat(str.slice(0, -2));\n  }\n}\n\n/**\n * @param {string|number} offset\n * @param {number} contextHeight\n * @return {number} A number representing `offset` converted into pixels.\n */\nfunction computeOffsetPixels(offset, contextHeight) {\n  var pixelOffset = parseOffsetAsPixels(offset);\n\n  if (typeof pixelOffset === 'number') {\n    return pixelOffset;\n  }\n\n  var percentOffset = parseOffsetAsPercentage(offset);\n  if (typeof percentOffset === 'number') {\n    return percentOffset * contextHeight;\n  }\n}\n\nvar constants = {\n  above: 'above',\n  inside: 'inside',\n  below: 'below',\n  invisible: 'invisible'\n};\n\nfunction debugLog() {\n  if (process.env.NODE_ENV !== 'production') {\n    console.log(arguments); // eslint-disable-line no-console\n  }\n}\n\nvar errorMessage = '<Waypoint> expected to receive a single React element child.\\n\\n' + 'See https://goo.gl/LrBNgw for more info.';\n\n/**\n * Raise an error if more that one child was provided to \"children\"\n *\n * @param {?React.element} children\n * @return {undefined}\n */\nfunction ensureChildrenIsValid(children) {\n  if (children) {\n    try {\n      React.Children.only(children);\n    } catch (e) {\n      throw new Error(errorMessage);\n    }\n  }\n}\n\n/**\n * When an element's type is a string, it represents a DOM node with that tag name\n * https://facebook.github.io/react/blog/2015/12/18/react-components-elements-and-instances.html#dom-elements\n *\n * @param {React.element} Component\n * @return {bool} Whether the component is a DOM Element\n */\nfunction isDOMElement(Component) {\n  return typeof Component.type === 'string';\n}\n\nvar errorMessage$1 = '<Waypoint> needs a DOM element to compute boundaries. The child you passed is neither a ' + 'DOM element (e.g. <div>) nor does it use the innerRef prop.\\n\\n' + 'See https://goo.gl/LrBNgw for more info.';\n\n/**\n * Raise an error if \"children\" is not a DOM Element and there is no ref provided to Waypoint\n *\n * @param {?React.element} children\n * @param {?HTMLElement} ref\n * @return {undefined}\n */\nfunction ensureRefIsProvidedByChild(children, ref) {\n  if (children && !isDOMElement(children) && !ref) {\n    throw new Error(errorMessage$1);\n  }\n}\n\n/**\n * @param {object} bounds An object with bounds data for the waypoint and\n *   scrollable parent\n * @return {string} The current position of the waypoint in relation to the\n *   visible portion of the scrollable parent. One of `constants.above`,\n *   `constants.below`, or `constants.inside`.\n */\nfunction getCurrentPosition(bounds) {\n  if (bounds.viewportBottom - bounds.viewportTop === 0) {\n    return constants.invisible;\n  }\n\n  // top is within the viewport\n  if (bounds.viewportTop <= bounds.waypointTop && bounds.waypointTop <= bounds.viewportBottom) {\n    return constants.inside;\n  }\n\n  // bottom is within the viewport\n  if (bounds.viewportTop <= bounds.waypointBottom && bounds.waypointBottom <= bounds.viewportBottom) {\n    return constants.inside;\n  }\n\n  // top is above the viewport and bottom is below the viewport\n  if (bounds.waypointTop <= bounds.viewportTop && bounds.viewportBottom <= bounds.waypointBottom) {\n    return constants.inside;\n  }\n\n  if (bounds.viewportBottom < bounds.waypointTop) {\n    return constants.below;\n  }\n\n  if (bounds.waypointTop < bounds.viewportTop) {\n    return constants.above;\n  }\n\n  return constants.invisible;\n}\n\nvar timeout = void 0;\nvar timeoutQueue = [];\n\nfunction onNextTick(cb) {\n  timeoutQueue.push(cb);\n\n  if (!timeout) {\n    timeout = setTimeout(function () {\n      timeout = null;\n\n      // Drain the timeoutQueue\n      var item = void 0;\n      // eslint-disable-next-line no-cond-assign\n      while (item = timeoutQueue.shift()) {\n        item();\n      }\n    }, 0);\n  }\n\n  var isSubscribed = true;\n\n  return function () {\n    function unsubscribe() {\n      if (!isSubscribed) {\n        return;\n      }\n\n      isSubscribed = false;\n\n      var index = timeoutQueue.indexOf(cb);\n      if (index === -1) {\n        return;\n      }\n\n      timeoutQueue.splice(index, 1);\n\n      if (!timeoutQueue.length && timeout) {\n        clearTimeout(timeout);\n        timeout = null;\n      }\n    }\n\n    return unsubscribe;\n  }();\n}\n\nfunction resolveScrollableAncestorProp(scrollableAncestor) {\n  // When Waypoint is rendered on the server, `window` is not available.\n  // To make Waypoint easier to work with, we allow this to be specified in\n  // string form and safely convert to `window` here.\n  if (scrollableAncestor === 'window') {\n    return global.window;\n  }\n\n  return scrollableAncestor;\n}\n\nvar _createClass = function () { function 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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return call && (typeof call === \"object\" || typeof call === \"function\") ? call : self; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function, not \" + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }\n\nvar defaultProps = {\n  topOffset: '0px',\n  bottomOffset: '0px',\n  horizontal: false,\n  onEnter: function () {\n    function onEnter() {}\n\n    return onEnter;\n  }(),\n  onLeave: function () {\n    function onLeave() {}\n\n    return onLeave;\n  }(),\n  onPositionChange: function () {\n    function onPositionChange() {}\n\n    return onPositionChange;\n  }(),\n\n  fireOnRapidScroll: true\n};\n\n// React.PureComponent was added in React 15.3.0\nvar BaseClass = typeof React.PureComponent !== 'undefined' ? React.PureComponent : React.Component;\n\n// Calls a function when you scroll to the element.\n\nvar Waypoint = function (_BaseClass) {\n  _inherits(Waypoint, _BaseClass);\n\n  function Waypoint(props) {\n    _classCallCheck(this, Waypoint);\n\n    var _this = _possibleConstructorReturn(this, (Waypoint.__proto__ || Object.getPrototypeOf(Waypoint)).call(this, props));\n\n    _this.refElement = function (e) {\n      return _this._ref = e;\n    };\n    return _this;\n  }\n\n  _createClass(Waypoint, [{\n    key: 'componentWillMount',\n    value: function () {\n      function componentWillMount() {\n        ensureChildrenIsValid(this.props.children);\n      }\n\n      return componentWillMount;\n    }()\n  }, {\n    key: 'componentDidMount',\n    value: function () {\n      function componentDidMount() {\n        var _this2 = this;\n\n        if (!Waypoint.getWindow()) {\n          return;\n        }\n\n        // this._ref may occasionally not be set at this time. To help ensure that\n        // this works smoothly and to avoid layout thrashing, we want to delay the\n        // initial execution until the next tick.\n        this.cancelOnNextTick = onNextTick(function () {\n          _this2.cancelOnNextTick = null;\n\n          // Berofe doing anything, we want to check that this._ref is avaliable in Waypoint\n          ensureRefIsProvidedByChild(_this2.props.children, _this2._ref);\n\n          _this2._handleScroll = _this2._handleScroll.bind(_this2);\n          _this2.scrollableAncestor = _this2._findScrollableAncestor();\n\n          if (process.env.NODE_ENV !== 'production' && _this2.props.debug) {\n            debugLog('scrollableAncestor', _this2.scrollableAncestor);\n          }\n\n          _this2.scrollEventListenerUnsubscribe = addEventListener(_this2.scrollableAncestor, 'scroll', _this2._handleScroll, { passive: true });\n\n          _this2.resizeEventListenerUnsubscribe = addEventListener(window, 'resize', _this2._handleScroll, { passive: true });\n\n          _this2._handleScroll(null);\n        });\n      }\n\n      return componentDidMount;\n    }()\n  }, {\n    key: 'componentWillReceiveProps',\n    value: function () {\n      function componentWillReceiveProps(newProps) {\n        ensureChildrenIsValid(newProps.children);\n      }\n\n      return componentWillReceiveProps;\n    }()\n  }, {\n    key: 'componentDidUpdate',\n    value: function () {\n      function componentDidUpdate() {\n        var _this3 = this;\n\n        if (!Waypoint.getWindow()) {\n          return;\n        }\n\n        if (!this.scrollableAncestor) {\n          // The Waypoint has not yet initialized.\n          return;\n        }\n\n        // The element may have moved, so we need to recompute its position on the\n        // page. This happens via handleScroll in a way that forces layout to be\n        // computed.\n        //\n        // We want this to be deferred to avoid forcing layout during render, which\n        // causes layout thrashing. And, if we already have this work enqueued, we\n        // can just wait for that to happen instead of enqueueing again.\n        if (this.cancelOnNextTick) {\n          return;\n        }\n\n        this.cancelOnNextTick = onNextTick(function () {\n          _this3.cancelOnNextTick = null;\n          _this3._handleScroll(null);\n        });\n      }\n\n      return componentDidUpdate;\n    }()\n  }, {\n    key: 'componentWillUnmount',\n    value: function () {\n      function componentWillUnmount() {\n        if (!Waypoint.getWindow()) {\n          return;\n        }\n\n        if (this.scrollEventListenerUnsubscribe) {\n          this.scrollEventListenerUnsubscribe();\n        }\n        if (this.resizeEventListenerUnsubscribe) {\n          this.resizeEventListenerUnsubscribe();\n        }\n\n        if (this.cancelOnNextTick) {\n          this.cancelOnNextTick();\n        }\n      }\n\n      return componentWillUnmount;\n    }()\n\n    /**\n     * Traverses up the DOM to find an ancestor container which has an overflow\n     * style that allows for scrolling.\n     *\n     * @return {Object} the closest ancestor element with an overflow style that\n     *   allows for scrolling. If none is found, the `window` object is returned\n     *   as a fallback.\n     */\n\n  }, {\n    key: '_findScrollableAncestor',\n    value: function () {\n      function _findScrollableAncestor() {\n        var _props = this.props,\n            horizontal = _props.horizontal,\n            scrollableAncestor = _props.scrollableAncestor;\n\n\n        if (scrollableAncestor) {\n          return resolveScrollableAncestorProp(scrollableAncestor);\n        }\n\n        var node = this._ref;\n\n        while (node.parentNode) {\n          node = node.parentNode;\n\n          if (node === document.body) {\n            // We've reached all the way to the root node.\n            return window;\n          }\n\n          var style = window.getComputedStyle(node);\n          var overflowDirec = horizontal ? style.getPropertyValue('overflow-x') : style.getPropertyValue('overflow-y');\n          var overflow = overflowDirec || style.getPropertyValue('overflow');\n\n          if (overflow === 'auto' || overflow === 'scroll') {\n            return node;\n          }\n        }\n\n        // A scrollable ancestor element was not found, which means that we need to\n        // do stuff on window.\n        return window;\n      }\n\n      return _findScrollableAncestor;\n    }()\n\n    /**\n     * @param {Object} event the native scroll event coming from the scrollable\n     *   ancestor, or resize event coming from the window. Will be undefined if\n     *   called by a React lifecyle method\n     */\n\n  }, {\n    key: '_handleScroll',\n    value: function () {\n      function _handleScroll(event) {\n        if (!this._ref) {\n          // There's a chance we end up here after the component has been unmounted.\n          return;\n        }\n\n        var bounds = this._getBounds();\n        var currentPosition = getCurrentPosition(bounds);\n        var previousPosition = this._previousPosition;\n\n        if (process.env.NODE_ENV !== 'production' && this.props.debug) {\n          debugLog('currentPosition', currentPosition);\n          debugLog('previousPosition', previousPosition);\n        }\n\n        // Save previous position as early as possible to prevent cycles\n        this._previousPosition = currentPosition;\n\n        if (previousPosition === currentPosition) {\n          // No change since last trigger\n          return;\n        }\n\n        var callbackArg = {\n          currentPosition: currentPosition,\n          previousPosition: previousPosition,\n          event: event,\n          waypointTop: bounds.waypointTop,\n          waypointBottom: bounds.waypointBottom,\n          viewportTop: bounds.viewportTop,\n          viewportBottom: bounds.viewportBottom\n        };\n        this.props.onPositionChange.call(this, callbackArg);\n\n        if (currentPosition === constants.inside) {\n          this.props.onEnter.call(this, callbackArg);\n        } else if (previousPosition === constants.inside) {\n          this.props.onLeave.call(this, callbackArg);\n        }\n\n        var isRapidScrollDown = previousPosition === constants.below && currentPosition === constants.above;\n        var isRapidScrollUp = previousPosition === constants.above && currentPosition === constants.below;\n\n        if (this.props.fireOnRapidScroll && (isRapidScrollDown || isRapidScrollUp)) {\n          // If the scroll event isn't fired often enough to occur while the\n          // waypoint was visible, we trigger both callbacks anyway.\n          this.props.onEnter.call(this, {\n            currentPosition: constants.inside,\n            previousPosition: previousPosition,\n            event: event,\n            waypointTop: bounds.waypointTop,\n            waypointBottom: bounds.waypointBottom,\n            viewportTop: bounds.viewportTop,\n            viewportBottom: bounds.viewportBottom\n          });\n          this.props.onLeave.call(this, {\n            currentPosition: currentPosition,\n            previousPosition: constants.inside,\n            event: event,\n            waypointTop: bounds.waypointTop,\n            waypointBottom: bounds.waypointBottom,\n            viewportTop: bounds.viewportTop,\n            viewportBottom: bounds.viewportBottom\n          });\n        }\n      }\n\n      return _handleScroll;\n    }()\n  }, {\n    key: '_getBounds',\n    value: function () {\n      function _getBounds() {\n        var horizontal = this.props.horizontal;\n\n        var _ref$getBoundingClien = this._ref.getBoundingClientRect(),\n            left = _ref$getBoundingClien.left,\n            top = _ref$getBoundingClien.top,\n            right = _ref$getBoundingClien.right,\n            bottom = _ref$getBoundingClien.bottom;\n\n        var waypointTop = horizontal ? left : top;\n        var waypointBottom = horizontal ? right : bottom;\n\n        var contextHeight = void 0;\n        var contextScrollTop = void 0;\n        if (this.scrollableAncestor === window) {\n          contextHeight = horizontal ? window.innerWidth : window.innerHeight;\n          contextScrollTop = 0;\n        } else {\n          contextHeight = horizontal ? this.scrollableAncestor.offsetWidth : this.scrollableAncestor.offsetHeight;\n          contextScrollTop = horizontal ? this.scrollableAncestor.getBoundingClientRect().left : this.scrollableAncestor.getBoundingClientRect().top;\n        }\n\n        if (process.env.NODE_ENV !== 'production' && this.props.debug) {\n          debugLog('waypoint top', waypointTop);\n          debugLog('waypoint bottom', waypointBottom);\n          debugLog('scrollableAncestor height', contextHeight);\n          debugLog('scrollableAncestor scrollTop', contextScrollTop);\n        }\n\n        var _props2 = this.props,\n            bottomOffset = _props2.bottomOffset,\n            topOffset = _props2.topOffset;\n\n        var topOffsetPx = computeOffsetPixels(topOffset, contextHeight);\n        var bottomOffsetPx = computeOffsetPixels(bottomOffset, contextHeight);\n        var contextBottom = contextScrollTop + contextHeight;\n\n        return {\n          waypointTop: waypointTop,\n          waypointBottom: waypointBottom,\n          viewportTop: contextScrollTop + topOffsetPx,\n          viewportBottom: contextBottom - bottomOffsetPx\n        };\n      }\n\n      return _getBounds;\n    }()\n\n    /**\n     * @return {Object}\n     */\n\n  }, {\n    key: 'render',\n    value: function () {\n      function render() {\n        var _this4 = this;\n\n        var children = this.props.children;\n\n\n        if (!children) {\n          // We need an element that we can locate in the DOM to determine where it is\n          // rendered relative to the top of its context.\n          return React.createElement('span', { ref: this.refElement, style: { fontSize: 0 } });\n        }\n\n        if (isDOMElement(children) || isForwardRef(children.type)) {\n          var ref = function () {\n            function ref(node) {\n              _this4.refElement(node);\n              if (children.ref) {\n                if (typeof children.ref === 'function') {\n                  children.ref(node);\n                } else {\n                  children.ref.current = node;\n                }\n              }\n            }\n\n            return ref;\n          }();\n\n          return React.cloneElement(children, { ref: ref });\n        }\n\n        return React.cloneElement(children, { innerRef: this.refElement });\n      }\n\n      return render;\n    }()\n  }]);\n\n  return Waypoint;\n}(BaseClass);\n\n\nWaypoint.propTypes = {\n  children: PropTypes.node,\n  debug: PropTypes.bool,\n  onEnter: PropTypes.func,\n  onLeave: PropTypes.func,\n  onPositionChange: PropTypes.func,\n  fireOnRapidScroll: PropTypes.bool,\n  scrollableAncestor: PropTypes.any,\n  horizontal: PropTypes.bool,\n\n  // `topOffset` can either be a number, in which case its a distance from the\n  // top of the container in pixels, or a string value. Valid string values are\n  // of the form \"20px\", which is parsed as pixels, or \"20%\", which is parsed\n  // as a percentage of the height of the containing element.\n  // For instance, if you pass \"-20%\", and the containing element is 100px tall,\n  // then the waypoint will be triggered when it has been scrolled 20px beyond\n  // the top of the containing element.\n  topOffset: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),\n\n  // `bottomOffset` is like `topOffset`, but for the bottom of the container.\n  bottomOffset: PropTypes.oneOfType([PropTypes.string, PropTypes.number])\n};\n\nWaypoint.above = constants.above;\nWaypoint.below = constants.below;\nWaypoint.inside = constants.inside;\nWaypoint.invisible = constants.invisible;\nWaypoint.getWindow = function () {\n  if (typeof window !== 'undefined') {\n    return window;\n  }\n};\nWaypoint.defaultProps = defaultProps;\nWaypoint.displayName = 'Waypoint';\n\nexport default Waypoint;\n","var CAN_USE_DOM = !!(typeof window !== 'undefined' && window.document && window.document.createElement);\n\n// Adapted from Modernizr\n// https://github.com/Modernizr/Modernizr/blob/acb3f0d9/feature-detects/dom/passiveeventlisteners.js#L26-L37\nfunction testPassiveEventListeners() {\n  if (!CAN_USE_DOM) {\n    return false;\n  }\n\n  if (!window.addEventListener || !window.removeEventListener || !Object.defineProperty) {\n    return false;\n  }\n\n  var supportsPassiveOption = false;\n  try {\n    var opts = Object.defineProperty({}, 'passive', {\n      // eslint-disable-next-line getter-return\n      get: function () {\n        function get() {\n          supportsPassiveOption = true;\n        }\n\n        return get;\n      }()\n    });\n    var noop = function noop() {};\n    window.addEventListener('testPassiveEventSupport', noop, opts);\n    window.removeEventListener('testPassiveEventSupport', noop, opts);\n  } catch (e) {\n    // do nothing\n  }\n\n  return supportsPassiveOption;\n}\n\nvar memoized = void 0;\n\nfunction canUsePassiveEventListeners() {\n  if (memoized === undefined) {\n    memoized = testPassiveEventListeners();\n  }\n  return memoized;\n}\n\nfunction normalizeEventOptions(eventOptions) {\n  if (!eventOptions) {\n    return undefined;\n  }\n\n  if (!canUsePassiveEventListeners()) {\n    // If the browser does not support the passive option, then it is expecting\n    // a boolean for the options argument to specify whether it should use\n    // capture or not. In more modern browsers, this is passed via the `capture`\n    // option, so let's just hoist that value up.\n    return !!eventOptions.capture;\n  }\n\n  return eventOptions;\n}\n\n/* eslint-disable no-bitwise */\n\n/**\n * Generate a unique key for any set of event options\n */\nfunction eventOptionsKey(normalizedEventOptions) {\n  if (!normalizedEventOptions) {\n    return 0;\n  }\n\n  // If the browser does not support passive event listeners, the normalized\n  // event options will be a boolean.\n  if (normalizedEventOptions === true) {\n    return 100;\n  }\n\n  // At this point, the browser supports passive event listeners, so we expect\n  // the event options to be an object with possible properties of capture,\n  // passive, and once.\n  //\n  // We want to consistently return the same value, regardless of the order of\n  // these properties, so let's use binary maths to assign each property to a\n  // bit, and then add those together (with an offset to account for the\n  // booleans at the beginning of this function).\n  var capture = normalizedEventOptions.capture << 0;\n  var passive = normalizedEventOptions.passive << 1;\n  var once = normalizedEventOptions.once << 2;\n  return capture + passive + once;\n}\n\nfunction ensureCanMutateNextEventHandlers(eventHandlers) {\n  if (eventHandlers.handlers === eventHandlers.nextHandlers) {\n    // eslint-disable-next-line no-param-reassign\n    eventHandlers.nextHandlers = eventHandlers.handlers.slice();\n  }\n}\n\nfunction TargetEventHandlers(target) {\n  this.target = target;\n  this.events = {};\n}\n\nTargetEventHandlers.prototype.getEventHandlers = function () {\n  function getEventHandlers(eventName, options) {\n    var key = String(eventName) + ' ' + String(eventOptionsKey(options));\n\n    if (!this.events[key]) {\n      this.events[key] = {\n        handlers: [],\n        handleEvent: undefined\n      };\n      this.events[key].nextHandlers = this.events[key].handlers;\n    }\n\n    return this.events[key];\n  }\n\n  return getEventHandlers;\n}();\n\nTargetEventHandlers.prototype.handleEvent = function () {\n  function handleEvent(eventName, options, event) {\n    var eventHandlers = this.getEventHandlers(eventName, options);\n    eventHandlers.handlers = eventHandlers.nextHandlers;\n    eventHandlers.handlers.forEach(function (handler) {\n      if (handler) {\n        // We need to check for presence here because a handler function may\n        // cause later handlers to get removed. This can happen if you for\n        // instance have a waypoint that unmounts another waypoint as part of an\n        // onEnter/onLeave handler.\n        handler(event);\n      }\n    });\n  }\n\n  return handleEvent;\n}();\n\nTargetEventHandlers.prototype.add = function () {\n  function add(eventName, listener, options) {\n    var _this = this;\n\n    // options has already been normalized at this point.\n    var eventHandlers = this.getEventHandlers(eventName, options);\n\n    ensureCanMutateNextEventHandlers(eventHandlers);\n\n    if (eventHandlers.nextHandlers.length === 0) {\n      eventHandlers.handleEvent = this.handleEvent.bind(this, eventName, options);\n\n      this.target.addEventListener(eventName, eventHandlers.handleEvent, options);\n    }\n\n    eventHandlers.nextHandlers.push(listener);\n\n    var isSubscribed = true;\n    var unsubscribe = function () {\n      function unsubscribe() {\n        if (!isSubscribed) {\n          return;\n        }\n\n        isSubscribed = false;\n\n        ensureCanMutateNextEventHandlers(eventHandlers);\n        var index = eventHandlers.nextHandlers.indexOf(listener);\n        eventHandlers.nextHandlers.splice(index, 1);\n\n        if (eventHandlers.nextHandlers.length === 0) {\n          // All event handlers have been removed, so we want to remove the event\n          // listener from the target node.\n\n          if (_this.target) {\n            // There can be a race condition where the target may no longer exist\n            // when this function is called, e.g. when a React component is\n            // unmounting. Guarding against this prevents the following error:\n            //\n            //   Cannot read property 'removeEventListener' of undefined\n            _this.target.removeEventListener(eventName, eventHandlers.handleEvent, options);\n          }\n\n          eventHandlers.handleEvent = undefined;\n        }\n      }\n\n      return unsubscribe;\n    }();\n    return unsubscribe;\n  }\n\n  return add;\n}();\n\nvar EVENT_HANDLERS_KEY = '__consolidated_events_handlers__';\n\n// eslint-disable-next-line import/prefer-default-export\nfunction addEventListener(target, eventName, listener, options) {\n  if (!target[EVENT_HANDLERS_KEY]) {\n    // eslint-disable-next-line no-param-reassign\n    target[EVENT_HANDLERS_KEY] = new TargetEventHandlers(target);\n  }\n  var normalizedEventOptions = normalizeEventOptions(options);\n  return target[EVENT_HANDLERS_KEY].add(eventName, listener, normalizedEventOptions);\n}\n\nexport { addEventListener };\n","'use strict';\n\nif (process.env.NODE_ENV === 'production') {\n  module.exports = require('./cjs/react-is.production.min.js');\n} else {\n  module.exports = require('./cjs/react-is.development.js');\n}\n","/** @license React v16.8.6\n * react-is.production.min.js\n *\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n'use strict';Object.defineProperty(exports,\"__esModule\",{value:!0});\nvar b=\"function\"===typeof Symbol&&Symbol.for,c=b?Symbol.for(\"react.element\"):60103,d=b?Symbol.for(\"react.portal\"):60106,e=b?Symbol.for(\"react.fragment\"):60107,f=b?Symbol.for(\"react.strict_mode\"):60108,g=b?Symbol.for(\"react.profiler\"):60114,h=b?Symbol.for(\"react.provider\"):60109,k=b?Symbol.for(\"react.context\"):60110,l=b?Symbol.for(\"react.async_mode\"):60111,m=b?Symbol.for(\"react.concurrent_mode\"):60111,n=b?Symbol.for(\"react.forward_ref\"):60112,p=b?Symbol.for(\"react.suspense\"):60113,q=b?Symbol.for(\"react.memo\"):\n60115,r=b?Symbol.for(\"react.lazy\"):60116;function t(a){if(\"object\"===typeof a&&null!==a){var u=a.$$typeof;switch(u){case c:switch(a=a.type,a){case l:case m:case e:case g:case f:case p:return a;default:switch(a=a&&a.$$typeof,a){case k:case n:case h:return a;default:return u}}case r:case q:case d:return u}}}function v(a){return t(a)===m}exports.typeOf=t;exports.AsyncMode=l;exports.ConcurrentMode=m;exports.ContextConsumer=k;exports.ContextProvider=h;exports.Element=c;exports.ForwardRef=n;\nexports.Fragment=e;exports.Lazy=r;exports.Memo=q;exports.Portal=d;exports.Profiler=g;exports.StrictMode=f;exports.Suspense=p;exports.isValidElementType=function(a){return\"string\"===typeof a||\"function\"===typeof a||a===e||a===m||a===g||a===f||a===p||\"object\"===typeof a&&null!==a&&(a.$$typeof===r||a.$$typeof===q||a.$$typeof===h||a.$$typeof===k||a.$$typeof===n)};exports.isAsyncMode=function(a){return v(a)||t(a)===l};exports.isConcurrentMode=v;exports.isContextConsumer=function(a){return t(a)===k};\nexports.isContextProvider=function(a){return t(a)===h};exports.isElement=function(a){return\"object\"===typeof a&&null!==a&&a.$$typeof===c};exports.isForwardRef=function(a){return t(a)===n};exports.isFragment=function(a){return t(a)===e};exports.isLazy=function(a){return t(a)===r};exports.isMemo=function(a){return t(a)===q};exports.isPortal=function(a){return t(a)===d};exports.isProfiler=function(a){return t(a)===g};exports.isStrictMode=function(a){return t(a)===f};\nexports.isSuspense=function(a){return t(a)===p};\n","\"use strict\";\n\nvar _interopRequireDefault = require(\"@babel/runtime/helpers/interopRequireDefault\");\n\nexports.__esModule = true;\nexports.default = void 0;\n\nvar _inheritsLoose2 = _interopRequireDefault(require(\"@babel/runtime/helpers/inheritsLoose\"));\n\nvar _assertThisInitialized2 = _interopRequireDefault(require(\"@babel/runtime/helpers/assertThisInitialized\"));\n\nvar _objectWithoutPropertiesLoose2 = _interopRequireDefault(require(\"@babel/runtime/helpers/objectWithoutPropertiesLoose\"));\n\nvar _extends2 = _interopRequireDefault(require(\"@babel/runtime/helpers/extends\"));\n\nvar _react = _interopRequireDefault(require(\"react\"));\n\nvar _propTypes = _interopRequireDefault(require(\"prop-types\"));\n\n// Handle legacy names for image queries.\nvar convertProps = function convertProps(props) {\n  var convertedProps = (0, _extends2.default)({}, props);\n\n  if (convertedProps.resolutions) {\n    convertedProps.fixed = convertedProps.resolutions;\n    delete convertedProps.resolutions;\n  }\n\n  if (convertedProps.sizes) {\n    convertedProps.fluid = convertedProps.sizes;\n    delete convertedProps.sizes;\n  }\n\n  return convertedProps;\n}; // Cache if we've seen an image before so we don't bother with\n// lazy-loading & fading in on subsequent mounts.\n\n\nvar imageCache = Object.create({});\n\nvar inImageCache = function inImageCache(props) {\n  var convertedProps = convertProps(props); // Find src\n\n  var src = convertedProps.fluid ? convertedProps.fluid.src : convertedProps.fixed.src;\n  return imageCache[src] || false;\n};\n\nvar activateCacheForImage = function activateCacheForImage(props) {\n  var convertedProps = convertProps(props); // Find src\n\n  var src = convertedProps.fluid ? convertedProps.fluid.src : convertedProps.fixed.src;\n  imageCache[src] = true;\n};\n\nvar io;\nvar listeners = new WeakMap();\n\nfunction getIO() {\n  if (typeof io === \"undefined\" && typeof window !== \"undefined\" && window.IntersectionObserver) {\n    io = new window.IntersectionObserver(function (entries) {\n      entries.forEach(function (entry) {\n        if (listeners.has(entry.target)) {\n          var cb = listeners.get(entry.target); // Edge doesn't currently support isIntersecting, so also test for an intersectionRatio > 0\n\n          if (entry.isIntersecting || entry.intersectionRatio > 0) {\n            io.unobserve(entry.target);\n            listeners.delete(entry.target);\n            cb();\n          }\n        }\n      });\n    }, {\n      rootMargin: \"200px\"\n    });\n  }\n\n  return io;\n}\n\nvar listenToIntersections = function listenToIntersections(el, cb) {\n  var observer = getIO();\n\n  if (observer) {\n    observer.observe(el);\n    listeners.set(el, cb);\n  }\n\n  return function () {\n    observer.unobserve(el);\n    listeners.delete(el);\n  };\n};\n\nvar noscriptImg = function noscriptImg(props) {\n  // Check if prop exists before adding each attribute to the string output below to prevent\n  // HTML validation issues caused by empty values like width=\"\" and height=\"\"\n  var src = props.src ? \"src=\\\"\" + props.src + \"\\\" \" : \"src=\\\"\\\" \"; // required attribute\n\n  var sizes = props.sizes ? \"sizes=\\\"\" + props.sizes + \"\\\" \" : \"\";\n  var srcSetWebp = props.srcSetWebp ? \"<source type='image/webp' srcset=\\\"\" + props.srcSetWebp + \"\\\" \" + sizes + \"/>\" : \"\";\n  var srcSet = props.srcSet ? \"srcset=\\\"\" + props.srcSet + \"\\\" \" : \"\";\n  var title = props.title ? \"title=\\\"\" + props.title + \"\\\" \" : \"\";\n  var alt = props.alt ? \"alt=\\\"\" + props.alt + \"\\\" \" : \"alt=\\\"\\\" \"; // required attribute\n\n  var width = props.width ? \"width=\\\"\" + props.width + \"\\\" \" : \"\";\n  var height = props.height ? \"height=\\\"\" + props.height + \"\\\" \" : \"\";\n  var crossOrigin = props.crossOrigin ? \"crossorigin=\\\"\" + props.crossOrigin + \"\\\" \" : \"\";\n  return \"<picture>\" + srcSetWebp + \"<img \" + width + height + sizes + srcSet + src + alt + title + crossOrigin + \"style=\\\"position:absolute;top:0;left:0;opacity:1;width:100%;height:100%;object-fit:cover;object-position:center\\\"/></picture>\";\n};\n\nvar Img = _react.default.forwardRef(function (props, ref) {\n  var sizes = props.sizes,\n      srcSet = props.srcSet,\n      src = props.src,\n      style = props.style,\n      onLoad = props.onLoad,\n      onError = props.onError,\n      otherProps = (0, _objectWithoutPropertiesLoose2.default)(props, [\"sizes\", \"srcSet\", \"src\", \"style\", \"onLoad\", \"onError\"]);\n  return _react.default.createElement(\"img\", (0, _extends2.default)({\n    sizes: sizes,\n    srcSet: srcSet,\n    src: src\n  }, otherProps, {\n    onLoad: onLoad,\n    onError: onError,\n    ref: ref,\n    style: (0, _extends2.default)({\n      position: \"absolute\",\n      top: 0,\n      left: 0,\n      width: \"100%\",\n      height: \"100%\",\n      objectFit: \"cover\",\n      objectPosition: \"center\"\n    }, style)\n  }));\n});\n\nImg.propTypes = {\n  style: _propTypes.default.object,\n  onError: _propTypes.default.func,\n  onLoad: _propTypes.default.func\n};\n\nvar Image =\n/*#__PURE__*/\nfunction (_React$Component) {\n  (0, _inheritsLoose2.default)(Image, _React$Component);\n\n  function Image(props) {\n    var _this;\n\n    _this = _React$Component.call(this, props) || this; // default settings for browser without Intersection Observer available\n\n    var isVisible = true;\n    var imgLoaded = false;\n    var imgCached = false;\n    var IOSupported = false;\n    var fadeIn = props.fadeIn; // If this image has already been loaded before then we can assume it's\n    // already in the browser cache so it's cheap to just show directly.\n\n    var seenBefore = inImageCache(props); // browser with Intersection Observer available\n\n    if (!seenBefore && typeof window !== \"undefined\" && window.IntersectionObserver) {\n      isVisible = false;\n      IOSupported = true;\n    } // Never render image during SSR\n\n\n    if (typeof window === \"undefined\") {\n      isVisible = false;\n    } // Force render for critical images\n\n\n    if (props.critical) {\n      isVisible = true;\n      IOSupported = false;\n    }\n\n    var hasNoScript = !(props.critical && !props.fadeIn);\n    _this.state = {\n      isVisible: isVisible,\n      imgLoaded: imgLoaded,\n      imgCached: imgCached,\n      IOSupported: IOSupported,\n      fadeIn: fadeIn,\n      hasNoScript: hasNoScript,\n      seenBefore: seenBefore\n    };\n    _this.imageRef = _react.default.createRef();\n    _this.handleImageLoaded = _this.handleImageLoaded.bind((0, _assertThisInitialized2.default)((0, _assertThisInitialized2.default)(_this)));\n    _this.handleRef = _this.handleRef.bind((0, _assertThisInitialized2.default)((0, _assertThisInitialized2.default)(_this)));\n    return _this;\n  }\n\n  var _proto = Image.prototype;\n\n  _proto.componentDidMount = function componentDidMount() {\n    if (this.state.isVisible && typeof this.props.onStartLoad === \"function\") {\n      this.props.onStartLoad({\n        wasCached: inImageCache(this.props)\n      });\n    }\n\n    if (this.props.critical) {\n      var img = this.imageRef.current;\n\n      if (img && img.complete) {\n        this.handleImageLoaded();\n      }\n    }\n  };\n\n  _proto.componentWillUnmount = function componentWillUnmount() {\n    if (this.cleanUpListeners) {\n      this.cleanUpListeners();\n    }\n  };\n\n  _proto.handleRef = function handleRef(ref) {\n    var _this2 = this;\n\n    if (this.state.IOSupported && ref) {\n      this.cleanUpListeners = listenToIntersections(ref, function () {\n        var imageInCache = inImageCache(_this2.props);\n\n        if (!_this2.state.isVisible && typeof _this2.props.onStartLoad === \"function\") {\n          _this2.props.onStartLoad({\n            wasCached: imageInCache\n          });\n        } // imgCached and imgLoaded must update after isVisible,\n        // Once isVisible is true, imageRef becomes accessible, which imgCached needs access to.\n        // imgLoaded and imgCached are in a 2nd setState call to be changed together,\n        // avoiding initiating unnecessary animation frames from style changes.\n\n\n        _this2.setState({\n          isVisible: true\n        }, function () {\n          return _this2.setState({\n            imgLoaded: imageInCache,\n            imgCached: !!_this2.imageRef.current.currentSrc\n          });\n        });\n      });\n    }\n  };\n\n  _proto.handleImageLoaded = function handleImageLoaded() {\n    activateCacheForImage(this.props);\n    this.setState({\n      imgLoaded: true\n    });\n\n    if (this.state.seenBefore) {\n      this.setState({\n        fadeIn: false\n      });\n    }\n\n    if (this.props.onLoad) {\n      this.props.onLoad();\n    }\n  };\n\n  _proto.render = function render() {\n    var _convertProps = convertProps(this.props),\n        title = _convertProps.title,\n        alt = _convertProps.alt,\n        className = _convertProps.className,\n        _convertProps$style = _convertProps.style,\n        style = _convertProps$style === void 0 ? {} : _convertProps$style,\n        _convertProps$imgStyl = _convertProps.imgStyle,\n        imgStyle = _convertProps$imgStyl === void 0 ? {} : _convertProps$imgStyl,\n        _convertProps$placeho = _convertProps.placeholderStyle,\n        placeholderStyle = _convertProps$placeho === void 0 ? {} : _convertProps$placeho,\n        placeholderClassName = _convertProps.placeholderClassName,\n        fluid = _convertProps.fluid,\n        fixed = _convertProps.fixed,\n        backgroundColor = _convertProps.backgroundColor,\n        durationFadeIn = _convertProps.durationFadeIn,\n        Tag = _convertProps.Tag,\n        itemProp = _convertProps.itemProp;\n\n    var shouldReveal = this.state.imgLoaded || this.state.fadeIn === false;\n    var shouldFadeIn = this.state.fadeIn === true && !this.state.imgCached;\n    var imageStyle = (0, _extends2.default)({\n      opacity: shouldReveal ? 1 : 0,\n      transition: shouldFadeIn ? \"opacity \" + durationFadeIn + \"ms\" : \"none\"\n    }, imgStyle);\n    var bgColor = typeof backgroundColor === \"boolean\" ? \"lightgray\" : backgroundColor;\n    var delayHideStyle = {\n      transitionDelay: durationFadeIn + \"ms\"\n    };\n    var imagePlaceholderStyle = (0, _extends2.default)({\n      opacity: this.state.imgLoaded ? 0 : 1\n    }, shouldFadeIn && delayHideStyle, imgStyle, placeholderStyle);\n    var placeholderImageProps = {\n      title: title,\n      alt: !this.state.isVisible ? alt : \"\",\n      style: imagePlaceholderStyle,\n      className: placeholderClassName\n    };\n\n    if (fluid) {\n      var image = fluid;\n      return _react.default.createElement(Tag, {\n        className: (className ? className : \"\") + \" gatsby-image-wrapper\",\n        style: (0, _extends2.default)({\n          position: \"relative\",\n          overflow: \"hidden\"\n        }, style),\n        ref: this.handleRef,\n        key: \"fluid-\" + JSON.stringify(image.srcSet)\n      }, _react.default.createElement(Tag, {\n        style: {\n          width: \"100%\",\n          paddingBottom: 100 / image.aspectRatio + \"%\"\n        }\n      }), bgColor && _react.default.createElement(Tag, {\n        title: title,\n        style: (0, _extends2.default)({\n          backgroundColor: bgColor,\n          position: \"absolute\",\n          top: 0,\n          bottom: 0,\n          opacity: !this.state.imgLoaded ? 1 : 0,\n          right: 0,\n          left: 0\n        }, shouldFadeIn && delayHideStyle)\n      }), image.base64 && _react.default.createElement(Img, (0, _extends2.default)({\n        src: image.base64\n      }, placeholderImageProps)), image.tracedSVG && _react.default.createElement(Img, (0, _extends2.default)({\n        src: image.tracedSVG\n      }, placeholderImageProps)), this.state.isVisible && _react.default.createElement(\"picture\", null, image.srcSetWebp && _react.default.createElement(\"source\", {\n        type: \"image/webp\",\n        srcSet: image.srcSetWebp,\n        sizes: image.sizes\n      }), _react.default.createElement(Img, {\n        alt: alt,\n        title: title,\n        sizes: image.sizes,\n        src: image.src,\n        crossOrigin: this.props.crossOrigin,\n        srcSet: image.srcSet,\n        style: imageStyle,\n        ref: this.imageRef,\n        onLoad: this.handleImageLoaded,\n        onError: this.props.onError,\n        itemProp: itemProp\n      })), this.state.hasNoScript && _react.default.createElement(\"noscript\", {\n        dangerouslySetInnerHTML: {\n          __html: noscriptImg((0, _extends2.default)({\n            alt: alt,\n            title: title\n          }, image))\n        }\n      }));\n    }\n\n    if (fixed) {\n      var _image = fixed;\n      var divStyle = (0, _extends2.default)({\n        position: \"relative\",\n        overflow: \"hidden\",\n        display: \"inline-block\",\n        width: _image.width,\n        height: _image.height\n      }, style);\n\n      if (style.display === \"inherit\") {\n        delete divStyle.display;\n      }\n\n      return _react.default.createElement(Tag, {\n        className: (className ? className : \"\") + \" gatsby-image-wrapper\",\n        style: divStyle,\n        ref: this.handleRef,\n        key: \"fixed-\" + JSON.stringify(_image.srcSet)\n      }, bgColor && _react.default.createElement(Tag, {\n        title: title,\n        style: (0, _extends2.default)({\n          backgroundColor: bgColor,\n          width: _image.width,\n          opacity: !this.state.imgLoaded ? 1 : 0,\n          height: _image.height\n        }, shouldFadeIn && delayHideStyle)\n      }), _image.base64 && _react.default.createElement(Img, (0, _extends2.default)({\n        src: _image.base64\n      }, placeholderImageProps)), _image.tracedSVG && _react.default.createElement(Img, (0, _extends2.default)({\n        src: _image.tracedSVG\n      }, placeholderImageProps)), this.state.isVisible && _react.default.createElement(\"picture\", null, _image.srcSetWebp && _react.default.createElement(\"source\", {\n        type: \"image/webp\",\n        srcSet: _image.srcSetWebp,\n        sizes: _image.sizes\n      }), _react.default.createElement(Img, {\n        alt: alt,\n        title: title,\n        width: _image.width,\n        height: _image.height,\n        sizes: _image.sizes,\n        src: _image.src,\n        crossOrigin: this.props.crossOrigin,\n        srcSet: _image.srcSet,\n        style: imageStyle,\n        ref: this.imageRef,\n        onLoad: this.handleImageLoaded,\n        onError: this.props.onError,\n        itemProp: itemProp\n      })), this.state.hasNoScript && _react.default.createElement(\"noscript\", {\n        dangerouslySetInnerHTML: {\n          __html: noscriptImg((0, _extends2.default)({\n            alt: alt,\n            title: title\n          }, _image))\n        }\n      }));\n    }\n\n    return null;\n  };\n\n  return Image;\n}(_react.default.Component);\n\nImage.defaultProps = {\n  critical: false,\n  fadeIn: true,\n  durationFadeIn: 500,\n  alt: \"\",\n  Tag: \"div\"\n};\n\nvar fixedObject = _propTypes.default.shape({\n  width: _propTypes.default.number.isRequired,\n  height: _propTypes.default.number.isRequired,\n  src: _propTypes.default.string.isRequired,\n  srcSet: _propTypes.default.string.isRequired,\n  base64: _propTypes.default.string,\n  tracedSVG: _propTypes.default.string,\n  srcWebp: _propTypes.default.string,\n  srcSetWebp: _propTypes.default.string\n});\n\nvar fluidObject = _propTypes.default.shape({\n  aspectRatio: _propTypes.default.number.isRequired,\n  src: _propTypes.default.string.isRequired,\n  srcSet: _propTypes.default.string.isRequired,\n  sizes: _propTypes.default.string.isRequired,\n  base64: _propTypes.default.string,\n  tracedSVG: _propTypes.default.string,\n  srcWebp: _propTypes.default.string,\n  srcSetWebp: _propTypes.default.string\n});\n\nImage.propTypes = {\n  resolutions: fixedObject,\n  sizes: fluidObject,\n  fixed: fixedObject,\n  fluid: fluidObject,\n  fadeIn: _propTypes.default.bool,\n  durationFadeIn: _propTypes.default.number,\n  title: _propTypes.default.string,\n  alt: _propTypes.default.string,\n  className: _propTypes.default.oneOfType([_propTypes.default.string, _propTypes.default.object]),\n  // Support Glamor's css prop.\n  critical: _propTypes.default.bool,\n  crossOrigin: _propTypes.default.oneOfType([_propTypes.default.string, _propTypes.default.bool]),\n  style: _propTypes.default.object,\n  imgStyle: _propTypes.default.object,\n  placeholderStyle: _propTypes.default.object,\n  placeholderClassName: _propTypes.default.string,\n  backgroundColor: _propTypes.default.oneOfType([_propTypes.default.string, _propTypes.default.bool]),\n  onLoad: _propTypes.default.func,\n  onError: _propTypes.default.func,\n  onStartLoad: _propTypes.default.func,\n  Tag: _propTypes.default.string,\n  itemProp: _propTypes.default.string\n};\nvar _default = Image;\nexports.default = _default;"],"sourceRoot":""}