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{ createElement, PureComponent } from 'react';\n\nvar classCallCheck = function (instance, Constructor) {\n  if (!(instance instanceof Constructor)) {\n    throw new TypeError(\"Cannot call a class as a function\");\n  }\n};\n\nvar createClass = function () {\n  function defineProperties(target, props) {\n    for (var i = 0; i < props.length; i++) {\n      var descriptor = props[i];\n      descriptor.enumerable = descriptor.enumerable || false;\n      descriptor.configurable = true;\n      if (\"value\" in descriptor) descriptor.writable = true;\n      Object.defineProperty(target, descriptor.key, descriptor);\n    }\n  }\n\n  return function (Constructor, protoProps, staticProps) {\n    if (protoProps) defineProperties(Constructor.prototype, protoProps);\n    if (staticProps) defineProperties(Constructor, staticProps);\n    return Constructor;\n  };\n}();\n\nvar _extends = Object.assign || function (target) {\n  for (var i = 1; i < arguments.length; i++) {\n    var source = arguments[i];\n\n    for (var key in source) {\n      if (Object.prototype.hasOwnProperty.call(source, key)) {\n        target[key] = source[key];\n      }\n    }\n  }\n\n  return target;\n};\n\nvar inherits = function (subClass, superClass) {\n  if (typeof superClass !== \"function\" && superClass !== null) {\n    throw new TypeError(\"Super expression must either be null or a function, not \" + typeof superClass);\n  }\n\n  subClass.prototype = Object.create(superClass && superClass.prototype, {\n    constructor: {\n      value: subClass,\n      enumerable: false,\n      writable: true,\n      configurable: true\n    }\n  });\n  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;\n};\n\nvar possibleConstructorReturn = function (self, call) {\n  if (!self) {\n    throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n  }\n\n  return call && (typeof call === \"object\" || typeof call === \"function\") ? call : self;\n};\n\nvar slicedToArray = function () {\n  function sliceIterator(arr, i) {\n    var _arr = [];\n    var _n = true;\n    var _d = false;\n    var _e = undefined;\n\n    try {\n      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {\n        _arr.push(_s.value);\n\n        if (i && _arr.length === i) break;\n      }\n    } catch (err) {\n      _d = true;\n      _e = err;\n    } finally {\n      try {\n        if (!_n && _i[\"return\"]) _i[\"return\"]();\n      } finally {\n        if (_d) throw _e;\n      }\n    }\n\n    return _arr;\n  }\n\n  return function (arr, i) {\n    if (Array.isArray(arr)) {\n      return arr;\n    } else if (Symbol.iterator in Object(arr)) {\n      return sliceIterator(arr, i);\n    } else {\n      throw new TypeError(\"Invalid attempt to destructure non-iterable instance\");\n    }\n  };\n}();\n\n/**\n * Detect Element Resize.\n * https://github.com/sdecima/javascript-detect-element-resize\n * Sebastian Decima\n *\n * Forked from version 0.5.3; includes the following modifications:\n * 1) Guard against unsafe 'window' and 'document' references (to support SSR).\n * 2) Defer initialization code via a top-level function wrapper (to support SSR).\n * 3) Avoid unnecessary reflows by not measuring size for scroll events bubbling from children.\n * 4) Add nonce for style element.\n **/\n\n// Check `document` and `window` in case of server-side rendering\nvar windowObject = void 0;\nif (typeof window !== 'undefined') {\n  windowObject = window;\n\n  // eslint-disable-next-line no-restricted-globals\n} else if (typeof self !== 'undefined') {\n  // eslint-disable-next-line no-restricted-globals\n  windowObject = self;\n} else {\n  windowObject = global;\n}\n\nvar cancelFrame = null;\nvar requestFrame = null;\n\nvar TIMEOUT_DURATION = 20;\n\nvar clearTimeoutFn = windowObject.clearTimeout;\nvar setTimeoutFn = windowObject.setTimeout;\n\nvar cancelAnimationFrameFn = windowObject.cancelAnimationFrame || windowObject.mozCancelAnimationFrame || windowObject.webkitCancelAnimationFrame;\n\nvar requestAnimationFrameFn = windowObject.requestAnimationFrame || windowObject.mozRequestAnimationFrame || windowObject.webkitRequestAnimationFrame;\n\nif (cancelAnimationFrameFn == null || requestAnimationFrameFn == null) {\n  // For environments that don't support animation frame,\n  // fallback to a setTimeout based approach.\n  cancelFrame = clearTimeoutFn;\n  requestFrame = function requestAnimationFrameViaSetTimeout(callback) {\n    return setTimeoutFn(callback, TIMEOUT_DURATION);\n  };\n} else {\n  // Counter intuitively, environments that support animation frames can be trickier.\n  // Chrome's \"Throttle non-visible cross-origin iframes\" flag can prevent rAFs from being called.\n  // In this case, we should fallback to a setTimeout() implementation.\n  cancelFrame = function cancelFrame(_ref) {\n    var _ref2 = slicedToArray(_ref, 2),\n        animationFrameID = _ref2[0],\n        timeoutID = _ref2[1];\n\n    cancelAnimationFrameFn(animationFrameID);\n    clearTimeoutFn(timeoutID);\n  };\n  requestFrame = function requestAnimationFrameWithSetTimeoutFallback(callback) {\n    var animationFrameID = requestAnimationFrameFn(function animationFrameCallback() {\n      clearTimeoutFn(timeoutID);\n      callback();\n    });\n\n    var timeoutID = setTimeoutFn(function timeoutCallback() {\n      cancelAnimationFrameFn(animationFrameID);\n      callback();\n    }, TIMEOUT_DURATION);\n\n    return [animationFrameID, timeoutID];\n  };\n}\n\nfunction createDetectElementResize(nonce) {\n  var animationKeyframes = void 0;\n  var animationName = void 0;\n  var animationStartEvent = void 0;\n  var animationStyle = void 0;\n  var checkTriggers = void 0;\n  var resetTriggers = void 0;\n  var scrollListener = void 0;\n\n  var attachEvent = typeof document !== 'undefined' && document.attachEvent;\n  if (!attachEvent) {\n    resetTriggers = function resetTriggers(element) {\n      var triggers = element.__resizeTriggers__,\n          expand = triggers.firstElementChild,\n          contract = triggers.lastElementChild,\n          expandChild = expand.firstElementChild;\n      contract.scrollLeft = contract.scrollWidth;\n      contract.scrollTop = contract.scrollHeight;\n      expandChild.style.width = expand.offsetWidth + 1 + 'px';\n      expandChild.style.height = expand.offsetHeight + 1 + 'px';\n      expand.scrollLeft = expand.scrollWidth;\n      expand.scrollTop = expand.scrollHeight;\n    };\n\n    checkTriggers = function checkTriggers(element) {\n      return element.offsetWidth !== element.__resizeLast__.width || element.offsetHeight !== element.__resizeLast__.height;\n    };\n\n    scrollListener = function scrollListener(e) {\n      // Don't measure (which forces) reflow for scrolls that happen inside of children!\n      if (e.target.className && typeof e.target.className.indexOf === 'function' && e.target.className.indexOf('contract-trigger') < 0 && e.target.className.indexOf('expand-trigger') < 0) {\n        return;\n      }\n\n      var element = this;\n      resetTriggers(this);\n      if (this.__resizeRAF__) {\n        cancelFrame(this.__resizeRAF__);\n      }\n      this.__resizeRAF__ = requestFrame(function animationFrame() {\n        if (checkTriggers(element)) {\n          element.__resizeLast__.width = element.offsetWidth;\n          element.__resizeLast__.height = element.offsetHeight;\n          element.__resizeListeners__.forEach(function forEachResizeListener(fn) {\n            fn.call(element, e);\n          });\n        }\n      });\n    };\n\n    /* Detect CSS Animations support to detect element display/re-attach */\n    var animation = false;\n    var keyframeprefix = '';\n    animationStartEvent = 'animationstart';\n    var domPrefixes = 'Webkit Moz O ms'.split(' ');\n    var startEvents = 'webkitAnimationStart animationstart oAnimationStart MSAnimationStart'.split(' ');\n    var pfx = '';\n    {\n      var elm = document.createElement('fakeelement');\n      if (elm.style.animationName !== undefined) {\n        animation = true;\n      }\n\n      if (animation === false) {\n        for (var i = 0; i < domPrefixes.length; i++) {\n          if (elm.style[domPrefixes[i] + 'AnimationName'] !== undefined) {\n            pfx = domPrefixes[i];\n            keyframeprefix = '-' + pfx.toLowerCase() + '-';\n            animationStartEvent = startEvents[i];\n            animation = true;\n            break;\n          }\n        }\n      }\n    }\n\n    animationName = 'resizeanim';\n    animationKeyframes = '@' + keyframeprefix + 'keyframes ' + animationName + ' { from { opacity: 0; } to { opacity: 0; } } ';\n    animationStyle = keyframeprefix + 'animation: 1ms ' + animationName + '; ';\n  }\n\n  var createStyles = function createStyles(doc) {\n    if (!doc.getElementById('detectElementResize')) {\n      //opacity:0 works around a chrome bug https://code.google.com/p/chromium/issues/detail?id=286360\n      var css = (animationKeyframes ? animationKeyframes : '') + '.resize-triggers { ' + (animationStyle ? animationStyle : '') + 'visibility: hidden; opacity: 0; } ' + '.resize-triggers, .resize-triggers > div, .contract-trigger:before { content: \" \"; display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden; z-index: -1; } .resize-triggers > div { background: #eee; overflow: auto; } .contract-trigger:before { width: 200%; height: 200%; }',\n          head = doc.head || doc.getElementsByTagName('head')[0],\n          style = doc.createElement('style');\n\n      style.id = 'detectElementResize';\n      style.type = 'text/css';\n\n      if (nonce != null) {\n        style.setAttribute('nonce', nonce);\n      }\n\n      if (style.styleSheet) {\n        style.styleSheet.cssText = css;\n      } else {\n        style.appendChild(doc.createTextNode(css));\n      }\n\n      head.appendChild(style);\n    }\n  };\n\n  var addResizeListener = function addResizeListener(element, fn) {\n    if (attachEvent) {\n      element.attachEvent('onresize', fn);\n    } else {\n      if (!element.__resizeTriggers__) {\n        var doc = element.ownerDocument;\n        var elementStyle = windowObject.getComputedStyle(element);\n        if (elementStyle && elementStyle.position === 'static') {\n          element.style.position = 'relative';\n        }\n        createStyles(doc);\n        element.__resizeLast__ = {};\n        element.__resizeListeners__ = [];\n        (element.__resizeTriggers__ = doc.createElement('div')).className = 'resize-triggers';\n        var expandTrigger = doc.createElement('div');\n        expandTrigger.className = 'expand-trigger';\n        expandTrigger.appendChild(doc.createElement('div'));\n        var contractTrigger = doc.createElement('div');\n        contractTrigger.className = 'contract-trigger';\n        element.__resizeTriggers__.appendChild(expandTrigger);\n        element.__resizeTriggers__.appendChild(contractTrigger);\n        element.appendChild(element.__resizeTriggers__);\n        resetTriggers(element);\n        element.addEventListener('scroll', scrollListener, true);\n\n        /* Listen for a css animation to detect element display/re-attach */\n        if (animationStartEvent) {\n          element.__resizeTriggers__.__animationListener__ = function animationListener(e) {\n            if (e.animationName === animationName) {\n              resetTriggers(element);\n            }\n          };\n          element.__resizeTriggers__.addEventListener(animationStartEvent, element.__resizeTriggers__.__animationListener__);\n        }\n      }\n      element.__resizeListeners__.push(fn);\n    }\n  };\n\n  var removeResizeListener = function removeResizeListener(element, fn) {\n    if (attachEvent) {\n      element.detachEvent('onresize', fn);\n    } else {\n      element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);\n      if (!element.__resizeListeners__.length) {\n        element.removeEventListener('scroll', scrollListener, true);\n        if (element.__resizeTriggers__.__animationListener__) {\n          element.__resizeTriggers__.removeEventListener(animationStartEvent, element.__resizeTriggers__.__animationListener__);\n          element.__resizeTriggers__.__animationListener__ = null;\n        }\n        try {\n          element.__resizeTriggers__ = !element.removeChild(element.__resizeTriggers__);\n        } catch (e) {\n          // Preact compat; see developit/preact-compat/issues/228\n        }\n      }\n    }\n  };\n\n  return {\n    addResizeListener: addResizeListener,\n    removeResizeListener: removeResizeListener\n  };\n}\n\nvar AutoSizer = function (_React$PureComponent) {\n  inherits(AutoSizer, _React$PureComponent);\n\n  function AutoSizer() {\n    var _ref;\n\n    var _temp, _this, _ret;\n\n    classCallCheck(this, AutoSizer);\n\n    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return _ret = (_temp = (_this = possibleConstructorReturn(this, (_ref = AutoSizer.__proto__ || Object.getPrototypeOf(AutoSizer)).call.apply(_ref, [this].concat(args))), _this), _this.state = {\n      height: _this.props.defaultHeight || 0,\n      width: _this.props.defaultWidth || 0\n    }, _this._onResize = function () {\n      var _this$props = _this.props,\n          disableHeight = _this$props.disableHeight,\n          disableWidth = _this$props.disableWidth,\n          onResize = _this$props.onResize;\n\n\n      if (_this._parentNode) {\n        // Guard against AutoSizer component being removed from the DOM immediately after being added.\n        // This can result in invalid style values which can result in NaN values if we don't handle them.\n        // See issue #150 for more context.\n\n        var _height = _this._parentNode.offsetHeight || 0;\n        var _width = _this._parentNode.offsetWidth || 0;\n\n        var _style = window.getComputedStyle(_this._parentNode) || {};\n        var paddingLeft = parseInt(_style.paddingLeft, 10) || 0;\n        var paddingRight = parseInt(_style.paddingRight, 10) || 0;\n        var paddingTop = parseInt(_style.paddingTop, 10) || 0;\n        var paddingBottom = parseInt(_style.paddingBottom, 10) || 0;\n\n        var newHeight = _height - paddingTop - paddingBottom;\n        var newWidth = _width - paddingLeft - paddingRight;\n\n        if (!disableHeight && _this.state.height !== newHeight || !disableWidth && _this.state.width !== newWidth) {\n          _this.setState({\n            height: _height - paddingTop - paddingBottom,\n            width: _width - paddingLeft - paddingRight\n          });\n\n          onResize({ height: _height, width: _width });\n        }\n      }\n    }, _this._setRef = function (autoSizer) {\n      _this._autoSizer = autoSizer;\n    }, _temp), possibleConstructorReturn(_this, _ret);\n  }\n\n  createClass(AutoSizer, [{\n    key: 'componentDidMount',\n    value: function componentDidMount() {\n      var nonce = this.props.nonce;\n\n      if (this._autoSizer && this._autoSizer.parentNode && this._autoSizer.parentNode.ownerDocument && this._autoSizer.parentNode.ownerDocument.defaultView && this._autoSizer.parentNode instanceof this._autoSizer.parentNode.ownerDocument.defaultView.HTMLElement) {\n        // Delay access of parentNode until mount.\n        // This handles edge-cases where the component has already been unmounted before its ref has been set,\n        // As well as libraries like react-lite which have a slightly different lifecycle.\n        this._parentNode = this._autoSizer.parentNode;\n\n        // Defer requiring resize handler in order to support server-side rendering.\n        // See issue #41\n        this._detectElementResize = createDetectElementResize(nonce);\n        this._detectElementResize.addResizeListener(this._parentNode, this._onResize);\n\n        this._onResize();\n      }\n    }\n  }, {\n    key: 'componentWillUnmount',\n    value: function componentWillUnmount() {\n      if (this._detectElementResize && this._parentNode) {\n        this._detectElementResize.removeResizeListener(this._parentNode, this._onResize);\n      }\n    }\n  }, {\n    key: 'render',\n    value: function render() {\n      var _props = this.props,\n          children = _props.children,\n          className = _props.className,\n          disableHeight = _props.disableHeight,\n          disableWidth = _props.disableWidth,\n          style = _props.style;\n      var _state = this.state,\n          height = _state.height,\n          width = _state.width;\n\n      // Outer div should not force width/height since that may prevent containers from shrinking.\n      // Inner component should overflow and use calculated width/height.\n      // See issue #68 for more information.\n\n      var outerStyle = { overflow: 'visible' };\n      var childParams = {};\n\n      // Avoid rendering children before the initial measurements have been collected.\n      // At best this would just be wasting cycles.\n      var bailoutOnChildren = false;\n\n      if (!disableHeight) {\n        if (height === 0) {\n          bailoutOnChildren = true;\n        }\n        outerStyle.height = 0;\n        childParams.height = height;\n      }\n\n      if (!disableWidth) {\n        if (width === 0) {\n          bailoutOnChildren = true;\n        }\n        outerStyle.width = 0;\n        childParams.width = width;\n      }\n\n      return createElement(\n        'div',\n        {\n          className: className,\n          ref: this._setRef,\n          style: _extends({}, outerStyle, style)\n        },\n        !bailoutOnChildren && children(childParams)\n      );\n    }\n  }]);\n  return AutoSizer;\n}(PureComponent);\n\nAutoSizer.defaultProps = {\n  onResize: function onResize() {},\n  disableHeight: false,\n  disableWidth: false,\n  style: {}\n};\n\nexport default AutoSizer;\n","function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nimport React from \"react\";\nexport default (({\n  styles = {},\n  ...props\n}) => /*#__PURE__*/React.createElement(\"svg\", _extends({\n  viewBox: \"0 0 16 16\",\n  xmlns: \"http://www.w3.org/2000/svg\"\n}, props), /*#__PURE__*/React.createElement(\"path\", {\n  clipRule: \"evenodd\",\n  d: \"M4 6.2C4 3.9 5.8 2 8 2s4 1.9 4 4.2c0 .4-.1.9-.4 1.6-.2.6-.6 1.3-.9 2.1-.8 1.5-1.7 3-2.3 3.9-.2.3-.5.3-.7 0-.6-1-1.6-2.4-2.3-3.9-.4-.7-.8-1.5-1-2.1-.3-.7-.4-1.2-.4-1.6zM8 1C5.2 1 3 3.3 3 6.1c0 .6.2 1.3.5 2s.6 1.5 1 2.3c.8 1.5 1.8 3.1 2.4 4.1.5.8 1.7.8 2.2 0 .6-1 1.6-2.5 2.4-4.1.4-.8.8-1.5 1-2.3.3-.7.4-1.4.4-2A4.9 4.9 0 008 1zM7 6c0-.6.4-1 1-1s1 .4 1 1-.4 1-1 1-1-.4-1-1zm1-2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z\",\n  fillRule: \"evenodd\"\n})));","function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nimport React from \"react\";\nexport default (({\n  styles = {},\n  ...props\n}) => /*#__PURE__*/React.createElement(\"svg\", _extends({\n  viewBox: \"0 0 16 16\",\n  xmlns: \"http://www.w3.org/2000/svg\"\n}, props), /*#__PURE__*/React.createElement(\"path\", {\n  clipRule: \"evenodd\",\n  d: \"M8 9.2l4.9-5 1.4 1.4L8 12 1.7 5.6l1.4-1.4z\",\n  fillRule: \"evenodd\"\n})));","function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nimport React from \"react\";\nexport default (({\n  styles = {},\n  ...props\n}) => /*#__PURE__*/React.createElement(\"svg\", _extends({\n  viewBox: \"0 0 16 16\",\n  xmlns: \"http://www.w3.org/2000/svg\"\n}, props), /*#__PURE__*/React.createElement(\"path\", {\n  clipRule: \"evenodd\",\n  d: \"M2.6 5.1c.2-.1.6-.1.8 0L8 9.8l4.6-4.6c.2-.2.5-.2.7 0s.2.5 0 .7l-5 5s-.2.1-.3.1-.3-.1-.4-.1l-5-5c-.1-.2-.1-.6 0-.8z\",\n  fillRule: \"evenodd\"\n})));","var safeIsNaN = Number.isNaN ||\n    function ponyfill(value) {\n        return typeof value === 'number' && value !== value;\n    };\nfunction isEqual(first, second) {\n    if (first === second) {\n        return true;\n    }\n    if (safeIsNaN(first) && safeIsNaN(second)) {\n        return true;\n    }\n    return false;\n}\nfunction areInputsEqual(newInputs, lastInputs) {\n    if (newInputs.length !== lastInputs.length) {\n        return false;\n    }\n    for (var i = 0; i < newInputs.length; i++) {\n        if (!isEqual(newInputs[i], lastInputs[i])) {\n            return false;\n        }\n    }\n    return true;\n}\n\nfunction memoizeOne(resultFn, isEqual) {\n    if (isEqual === void 0) { isEqual = areInputsEqual; }\n    var lastThis;\n    var lastArgs = [];\n    var lastResult;\n    var calledOnce = false;\n    function memoized() {\n        var newArgs = [];\n        for (var _i = 0; _i < arguments.length; _i++) {\n            newArgs[_i] = arguments[_i];\n        }\n        if (calledOnce && lastThis === this && isEqual(newArgs, lastArgs)) {\n            return lastResult;\n        }\n        lastResult = resultFn.apply(this, newArgs);\n        calledOnce = true;\n        lastThis = this;\n        lastArgs = newArgs;\n        return lastResult;\n    }\n    return memoized;\n}\n\nexport default memoizeOne;\n","import _extends from '@babel/runtime/helpers/esm/extends';\nimport _inheritsLoose from '@babel/runtime/helpers/esm/inheritsLoose';\nimport _assertThisInitialized from '@babel/runtime/helpers/esm/assertThisInitialized';\nimport memoizeOne from 'memoize-one';\nimport { createElement, PureComponent } from 'react';\nimport _objectWithoutPropertiesLoose from '@babel/runtime/helpers/esm/objectWithoutPropertiesLoose';\n\n// Animation frame based implementation of setTimeout.\n// Inspired by Joe Lambert, https://gist.github.com/joelambert/1002116#file-requesttimeout-js\nvar hasNativePerformanceNow = typeof performance === 'object' && typeof performance.now === 'function';\nvar now = hasNativePerformanceNow ? function () {\n  return performance.now();\n} : function () {\n  return Date.now();\n};\nfunction cancelTimeout(timeoutID) {\n  cancelAnimationFrame(timeoutID.id);\n}\nfunction requestTimeout(callback, delay) {\n  var start = now();\n\n  function tick() {\n    if (now() - start >= delay) {\n      callback.call(null);\n    } else {\n      timeoutID.id = requestAnimationFrame(tick);\n    }\n  }\n\n  var timeoutID = {\n    id: requestAnimationFrame(tick)\n  };\n  return timeoutID;\n}\n\nvar size = -1; // This utility copied from \"dom-helpers\" package.\n\nfunction getScrollbarSize(recalculate) {\n  if (recalculate === void 0) {\n    recalculate = false;\n  }\n\n  if (size === -1 || recalculate) {\n    var div = document.createElement('div');\n    var style = div.style;\n    style.width = '50px';\n    style.height = '50px';\n    style.overflow = 'scroll';\n    document.body.appendChild(div);\n    size = div.offsetWidth - div.clientWidth;\n    document.body.removeChild(div);\n  }\n\n  return size;\n}\nvar cachedRTLResult = null; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n// Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).\n// Safari's elastic bounce makes detecting this even more complicated wrt potential false positives.\n// The safest way to check this is to intentionally set a negative offset,\n// and then verify that the subsequent \"scroll\" event matches the negative offset.\n// If it does not match, then we can assume a non-standard RTL scroll implementation.\n\nfunction getRTLOffsetType(recalculate) {\n  if (recalculate === void 0) {\n    recalculate = false;\n  }\n\n  if (cachedRTLResult === null || recalculate) {\n    var outerDiv = document.createElement('div');\n    var outerStyle = outerDiv.style;\n    outerStyle.width = '50px';\n    outerStyle.height = '50px';\n    outerStyle.overflow = 'scroll';\n    outerStyle.direction = 'rtl';\n    var innerDiv = document.createElement('div');\n    var innerStyle = innerDiv.style;\n    innerStyle.width = '100px';\n    innerStyle.height = '100px';\n    outerDiv.appendChild(innerDiv);\n    document.body.appendChild(outerDiv);\n\n    if (outerDiv.scrollLeft > 0) {\n      cachedRTLResult = 'positive-descending';\n    } else {\n      outerDiv.scrollLeft = 1;\n\n      if (outerDiv.scrollLeft === 0) {\n        cachedRTLResult = 'negative';\n      } else {\n        cachedRTLResult = 'positive-ascending';\n      }\n    }\n\n    document.body.removeChild(outerDiv);\n    return cachedRTLResult;\n  }\n\n  return cachedRTLResult;\n}\n\nvar IS_SCROLLING_DEBOUNCE_INTERVAL = 150;\n\nvar defaultItemKey = function defaultItemKey(_ref) {\n  var columnIndex = _ref.columnIndex,\n      data = _ref.data,\n      rowIndex = _ref.rowIndex;\n  return rowIndex + \":\" + columnIndex;\n}; // In DEV mode, this Set helps us only log a warning once per component instance.\n// This avoids spamming the console every time a render happens.\n\n\nvar devWarningsOverscanCount = null;\nvar devWarningsOverscanRowsColumnsCount = null;\nvar devWarningsTagName = null;\n\nif (process.env.NODE_ENV !== 'production') {\n  if (typeof window !== 'undefined' && typeof window.WeakSet !== 'undefined') {\n    devWarningsOverscanCount =\n    /*#__PURE__*/\n    new WeakSet();\n    devWarningsOverscanRowsColumnsCount =\n    /*#__PURE__*/\n    new WeakSet();\n    devWarningsTagName =\n    /*#__PURE__*/\n    new WeakSet();\n  }\n}\n\nfunction createGridComponent(_ref2) {\n  var _class, _temp;\n\n  var getColumnOffset = _ref2.getColumnOffset,\n      getColumnStartIndexForOffset = _ref2.getColumnStartIndexForOffset,\n      getColumnStopIndexForStartIndex = _ref2.getColumnStopIndexForStartIndex,\n      getColumnWidth = _ref2.getColumnWidth,\n      getEstimatedTotalHeight = _ref2.getEstimatedTotalHeight,\n      getEstimatedTotalWidth = _ref2.getEstimatedTotalWidth,\n      getOffsetForColumnAndAlignment = _ref2.getOffsetForColumnAndAlignment,\n      getOffsetForRowAndAlignment = _ref2.getOffsetForRowAndAlignment,\n      getRowHeight = _ref2.getRowHeight,\n      getRowOffset = _ref2.getRowOffset,\n      getRowStartIndexForOffset = _ref2.getRowStartIndexForOffset,\n      getRowStopIndexForStartIndex = _ref2.getRowStopIndexForStartIndex,\n      initInstanceProps = _ref2.initInstanceProps,\n      shouldResetStyleCacheOnItemSizeChange = _ref2.shouldResetStyleCacheOnItemSizeChange,\n      validateProps = _ref2.validateProps;\n  return _temp = _class =\n  /*#__PURE__*/\n  function (_PureComponent) {\n    _inheritsLoose(Grid, _PureComponent);\n\n    // Always use explicit constructor for React components.\n    // It produces less code after transpilation. (#26)\n    // eslint-disable-next-line no-useless-constructor\n    function Grid(props) {\n      var _this;\n\n      _this = _PureComponent.call(this, props) || this;\n      _this._instanceProps = initInstanceProps(_this.props, _assertThisInitialized(_assertThisInitialized(_this)));\n      _this._resetIsScrollingTimeoutId = null;\n      _this._outerRef = void 0;\n      _this.state = {\n        instance: _assertThisInitialized(_assertThisInitialized(_this)),\n        isScrolling: false,\n        horizontalScrollDirection: 'forward',\n        scrollLeft: typeof _this.props.initialScrollLeft === 'number' ? _this.props.initialScrollLeft : 0,\n        scrollTop: typeof _this.props.initialScrollTop === 'number' ? _this.props.initialScrollTop : 0,\n        scrollUpdateWasRequested: false,\n        verticalScrollDirection: 'forward'\n      };\n      _this._callOnItemsRendered = void 0;\n      _this._callOnItemsRendered = memoizeOne(function (overscanColumnStartIndex, overscanColumnStopIndex, overscanRowStartIndex, overscanRowStopIndex, visibleColumnStartIndex, visibleColumnStopIndex, visibleRowStartIndex, visibleRowStopIndex) {\n        return _this.props.onItemsRendered({\n          overscanColumnStartIndex: overscanColumnStartIndex,\n          overscanColumnStopIndex: overscanColumnStopIndex,\n          overscanRowStartIndex: overscanRowStartIndex,\n          overscanRowStopIndex: overscanRowStopIndex,\n          visibleColumnStartIndex: visibleColumnStartIndex,\n          visibleColumnStopIndex: visibleColumnStopIndex,\n          visibleRowStartIndex: visibleRowStartIndex,\n          visibleRowStopIndex: visibleRowStopIndex\n        });\n      });\n      _this._callOnScroll = void 0;\n      _this._callOnScroll = memoizeOne(function (scrollLeft, scrollTop, horizontalScrollDirection, verticalScrollDirection, scrollUpdateWasRequested) {\n        return _this.props.onScroll({\n          horizontalScrollDirection: horizontalScrollDirection,\n          scrollLeft: scrollLeft,\n          scrollTop: scrollTop,\n          verticalScrollDirection: verticalScrollDirection,\n          scrollUpdateWasRequested: scrollUpdateWasRequested\n        });\n      });\n      _this._getItemStyle = void 0;\n\n      _this._getItemStyle = function (rowIndex, columnIndex) {\n        var _this$props = _this.props,\n            columnWidth = _this$props.columnWidth,\n            direction = _this$props.direction,\n            rowHeight = _this$props.rowHeight;\n\n        var itemStyleCache = _this._getItemStyleCache(shouldResetStyleCacheOnItemSizeChange && columnWidth, shouldResetStyleCacheOnItemSizeChange && direction, shouldResetStyleCacheOnItemSizeChange && rowHeight);\n\n        var key = rowIndex + \":\" + columnIndex;\n        var style;\n\n        if (itemStyleCache.hasOwnProperty(key)) {\n          style = itemStyleCache[key];\n        } else {\n          var _offset = getColumnOffset(_this.props, columnIndex, _this._instanceProps);\n\n          var isRtl = direction === 'rtl';\n          itemStyleCache[key] = style = {\n            position: 'absolute',\n            left: isRtl ? undefined : _offset,\n            right: isRtl ? _offset : undefined,\n            top: getRowOffset(_this.props, rowIndex, _this._instanceProps),\n            height: getRowHeight(_this.props, rowIndex, _this._instanceProps),\n            width: getColumnWidth(_this.props, columnIndex, _this._instanceProps)\n          };\n        }\n\n        return style;\n      };\n\n      _this._getItemStyleCache = void 0;\n      _this._getItemStyleCache = memoizeOne(function (_, __, ___) {\n        return {};\n      });\n\n      _this._onScroll = function (event) {\n        var _event$currentTarget = event.currentTarget,\n            clientHeight = _event$currentTarget.clientHeight,\n            clientWidth = _event$currentTarget.clientWidth,\n            scrollLeft = _event$currentTarget.scrollLeft,\n            scrollTop = _event$currentTarget.scrollTop,\n            scrollHeight = _event$currentTarget.scrollHeight,\n            scrollWidth = _event$currentTarget.scrollWidth;\n\n        _this.setState(function (prevState) {\n          if (prevState.scrollLeft === scrollLeft && prevState.scrollTop === scrollTop) {\n            // Scroll position may have been updated by cDM/cDU,\n            // In which case we don't need to trigger another render,\n            // And we don't want to update state.isScrolling.\n            return null;\n          }\n\n          var direction = _this.props.direction; // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n          // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n          // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n          // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n\n          var calculatedScrollLeft = scrollLeft;\n\n          if (direction === 'rtl') {\n            switch (getRTLOffsetType()) {\n              case 'negative':\n                calculatedScrollLeft = -scrollLeft;\n                break;\n\n              case 'positive-descending':\n                calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;\n                break;\n            }\n          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n\n\n          calculatedScrollLeft = Math.max(0, Math.min(calculatedScrollLeft, scrollWidth - clientWidth));\n          var calculatedScrollTop = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));\n          return {\n            isScrolling: true,\n            horizontalScrollDirection: prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',\n            scrollLeft: calculatedScrollLeft,\n            scrollTop: calculatedScrollTop,\n            verticalScrollDirection: prevState.scrollTop < scrollTop ? 'forward' : 'backward',\n            scrollUpdateWasRequested: false\n          };\n        }, _this._resetIsScrollingDebounced);\n      };\n\n      _this._outerRefSetter = function (ref) {\n        var outerRef = _this.props.outerRef;\n        _this._outerRef = ref;\n\n        if (typeof outerRef === 'function') {\n          outerRef(ref);\n        } else if (outerRef != null && typeof outerRef === 'object' && outerRef.hasOwnProperty('current')) {\n          outerRef.current = ref;\n        }\n      };\n\n      _this._resetIsScrollingDebounced = function () {\n        if (_this._resetIsScrollingTimeoutId !== null) {\n          cancelTimeout(_this._resetIsScrollingTimeoutId);\n        }\n\n        _this._resetIsScrollingTimeoutId = requestTimeout(_this._resetIsScrolling, IS_SCROLLING_DEBOUNCE_INTERVAL);\n      };\n\n      _this._resetIsScrolling = function () {\n        _this._resetIsScrollingTimeoutId = null;\n\n        _this.setState({\n          isScrolling: false\n        }, function () {\n          // Clear style cache after state update has been committed.\n          // This way we don't break pure sCU for items that don't use isScrolling param.\n          _this._getItemStyleCache(-1);\n        });\n      };\n\n      return _this;\n    }\n\n    Grid.getDerivedStateFromProps = function getDerivedStateFromProps(nextProps, prevState) {\n      validateSharedProps(nextProps, prevState);\n      validateProps(nextProps);\n      return null;\n    };\n\n    var _proto = Grid.prototype;\n\n    _proto.scrollTo = function scrollTo(_ref3) {\n      var scrollLeft = _ref3.scrollLeft,\n          scrollTop = _ref3.scrollTop;\n\n      if (scrollLeft !== undefined) {\n        scrollLeft = Math.max(0, scrollLeft);\n      }\n\n      if (scrollTop !== undefined) {\n        scrollTop = Math.max(0, scrollTop);\n      }\n\n      this.setState(function (prevState) {\n        if (scrollLeft === undefined) {\n          scrollLeft = prevState.scrollLeft;\n        }\n\n        if (scrollTop === undefined) {\n          scrollTop = prevState.scrollTop;\n        }\n\n        if (prevState.scrollLeft === scrollLeft && prevState.scrollTop === scrollTop) {\n          return null;\n        }\n\n        return {\n          horizontalScrollDirection: prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',\n          scrollLeft: scrollLeft,\n          scrollTop: scrollTop,\n          scrollUpdateWasRequested: true,\n          verticalScrollDirection: prevState.scrollTop < scrollTop ? 'forward' : 'backward'\n        };\n      }, this._resetIsScrollingDebounced);\n    };\n\n    _proto.scrollToItem = function scrollToItem(_ref4) {\n      var _ref4$align = _ref4.align,\n          align = _ref4$align === void 0 ? 'auto' : _ref4$align,\n          columnIndex = _ref4.columnIndex,\n          rowIndex = _ref4.rowIndex;\n      var _this$props2 = this.props,\n          columnCount = _this$props2.columnCount,\n          height = _this$props2.height,\n          rowCount = _this$props2.rowCount,\n          width = _this$props2.width;\n      var _this$state = this.state,\n          scrollLeft = _this$state.scrollLeft,\n          scrollTop = _this$state.scrollTop;\n      var scrollbarSize = getScrollbarSize();\n\n      if (columnIndex !== undefined) {\n        columnIndex = Math.max(0, Math.min(columnIndex, columnCount - 1));\n      }\n\n      if (rowIndex !== undefined) {\n        rowIndex = Math.max(0, Math.min(rowIndex, rowCount - 1));\n      }\n\n      var estimatedTotalHeight = getEstimatedTotalHeight(this.props, this._instanceProps);\n      var estimatedTotalWidth = getEstimatedTotalWidth(this.props, this._instanceProps); // The scrollbar size should be considered when scrolling an item into view,\n      // to ensure it's fully visible.\n      // But we only need to account for its size when it's actually visible.\n\n      var horizontalScrollbarSize = estimatedTotalWidth > width ? scrollbarSize : 0;\n      var verticalScrollbarSize = estimatedTotalHeight > height ? scrollbarSize : 0;\n      this.scrollTo({\n        scrollLeft: columnIndex !== undefined ? getOffsetForColumnAndAlignment(this.props, columnIndex, align, scrollLeft, this._instanceProps, verticalScrollbarSize) : scrollLeft,\n        scrollTop: rowIndex !== undefined ? getOffsetForRowAndAlignment(this.props, rowIndex, align, scrollTop, this._instanceProps, horizontalScrollbarSize) : scrollTop\n      });\n    };\n\n    _proto.componentDidMount = function componentDidMount() {\n      var _this$props3 = this.props,\n          initialScrollLeft = _this$props3.initialScrollLeft,\n          initialScrollTop = _this$props3.initialScrollTop;\n\n      if (this._outerRef != null) {\n        var outerRef = this._outerRef;\n\n        if (typeof initialScrollLeft === 'number') {\n          outerRef.scrollLeft = initialScrollLeft;\n        }\n\n        if (typeof initialScrollTop === 'number') {\n          outerRef.scrollTop = initialScrollTop;\n        }\n      }\n\n      this._callPropsCallbacks();\n    };\n\n    _proto.componentDidUpdate = function componentDidUpdate() {\n      var direction = this.props.direction;\n      var _this$state2 = this.state,\n          scrollLeft = _this$state2.scrollLeft,\n          scrollTop = _this$state2.scrollTop,\n          scrollUpdateWasRequested = _this$state2.scrollUpdateWasRequested;\n\n      if (scrollUpdateWasRequested && this._outerRef != null) {\n        // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n        // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n        // So we need to determine which browser behavior we're dealing with, and mimic it.\n        var outerRef = this._outerRef;\n\n        if (direction === 'rtl') {\n          switch (getRTLOffsetType()) {\n            case 'negative':\n              outerRef.scrollLeft = -scrollLeft;\n              break;\n\n            case 'positive-ascending':\n              outerRef.scrollLeft = scrollLeft;\n              break;\n\n            default:\n              var clientWidth = outerRef.clientWidth,\n                  scrollWidth = outerRef.scrollWidth;\n              outerRef.scrollLeft = scrollWidth - clientWidth - scrollLeft;\n              break;\n          }\n        } else {\n          outerRef.scrollLeft = Math.max(0, scrollLeft);\n        }\n\n        outerRef.scrollTop = Math.max(0, scrollTop);\n      }\n\n      this._callPropsCallbacks();\n    };\n\n    _proto.componentWillUnmount = function componentWillUnmount() {\n      if (this._resetIsScrollingTimeoutId !== null) {\n        cancelTimeout(this._resetIsScrollingTimeoutId);\n      }\n    };\n\n    _proto.render = function render() {\n      var _this$props4 = this.props,\n          children = _this$props4.children,\n          className = _this$props4.className,\n          columnCount = _this$props4.columnCount,\n          direction = _this$props4.direction,\n          height = _this$props4.height,\n          innerRef = _this$props4.innerRef,\n          innerElementType = _this$props4.innerElementType,\n          innerTagName = _this$props4.innerTagName,\n          itemData = _this$props4.itemData,\n          _this$props4$itemKey = _this$props4.itemKey,\n          itemKey = _this$props4$itemKey === void 0 ? defaultItemKey : _this$props4$itemKey,\n          outerElementType = _this$props4.outerElementType,\n          outerTagName = _this$props4.outerTagName,\n          rowCount = _this$props4.rowCount,\n          style = _this$props4.style,\n          useIsScrolling = _this$props4.useIsScrolling,\n          width = _this$props4.width;\n      var isScrolling = this.state.isScrolling;\n\n      var _this$_getHorizontalR = this._getHorizontalRangeToRender(),\n          columnStartIndex = _this$_getHorizontalR[0],\n          columnStopIndex = _this$_getHorizontalR[1];\n\n      var _this$_getVerticalRan = this._getVerticalRangeToRender(),\n          rowStartIndex = _this$_getVerticalRan[0],\n          rowStopIndex = _this$_getVerticalRan[1];\n\n      var items = [];\n\n      if (columnCount > 0 && rowCount) {\n        for (var _rowIndex = rowStartIndex; _rowIndex <= rowStopIndex; _rowIndex++) {\n          for (var _columnIndex = columnStartIndex; _columnIndex <= columnStopIndex; _columnIndex++) {\n            items.push(createElement(children, {\n              columnIndex: _columnIndex,\n              data: itemData,\n              isScrolling: useIsScrolling ? isScrolling : undefined,\n              key: itemKey({\n                columnIndex: _columnIndex,\n                data: itemData,\n                rowIndex: _rowIndex\n              }),\n              rowIndex: _rowIndex,\n              style: this._getItemStyle(_rowIndex, _columnIndex)\n            }));\n          }\n        }\n      } // Read this value AFTER items have been created,\n      // So their actual sizes (if variable) are taken into consideration.\n\n\n      var estimatedTotalHeight = getEstimatedTotalHeight(this.props, this._instanceProps);\n      var estimatedTotalWidth = getEstimatedTotalWidth(this.props, this._instanceProps);\n      return createElement(outerElementType || outerTagName || 'div', {\n        className: className,\n        onScroll: this._onScroll,\n        ref: this._outerRefSetter,\n        style: _extends({\n          position: 'relative',\n          height: height,\n          width: width,\n          overflow: 'auto',\n          WebkitOverflowScrolling: 'touch',\n          willChange: 'transform',\n          direction: direction\n        }, style)\n      }, createElement(innerElementType || innerTagName || 'div', {\n        children: items,\n        ref: innerRef,\n        style: {\n          height: estimatedTotalHeight,\n          pointerEvents: isScrolling ? 'none' : undefined,\n          width: estimatedTotalWidth\n        }\n      }));\n    };\n\n    _proto._callPropsCallbacks = function _callPropsCallbacks() {\n      var _this$props5 = this.props,\n          columnCount = _this$props5.columnCount,\n          onItemsRendered = _this$props5.onItemsRendered,\n          onScroll = _this$props5.onScroll,\n          rowCount = _this$props5.rowCount;\n\n      if (typeof onItemsRendered === 'function') {\n        if (columnCount > 0 && rowCount > 0) {\n          var _this$_getHorizontalR2 = this._getHorizontalRangeToRender(),\n              _overscanColumnStartIndex = _this$_getHorizontalR2[0],\n              _overscanColumnStopIndex = _this$_getHorizontalR2[1],\n              _visibleColumnStartIndex = _this$_getHorizontalR2[2],\n              _visibleColumnStopIndex = _this$_getHorizontalR2[3];\n\n          var _this$_getVerticalRan2 = this._getVerticalRangeToRender(),\n              _overscanRowStartIndex = _this$_getVerticalRan2[0],\n              _overscanRowStopIndex = _this$_getVerticalRan2[1],\n              _visibleRowStartIndex = _this$_getVerticalRan2[2],\n              _visibleRowStopIndex = _this$_getVerticalRan2[3];\n\n          this._callOnItemsRendered(_overscanColumnStartIndex, _overscanColumnStopIndex, _overscanRowStartIndex, _overscanRowStopIndex, _visibleColumnStartIndex, _visibleColumnStopIndex, _visibleRowStartIndex, _visibleRowStopIndex);\n        }\n      }\n\n      if (typeof onScroll === 'function') {\n        var _this$state3 = this.state,\n            _horizontalScrollDirection = _this$state3.horizontalScrollDirection,\n            _scrollLeft = _this$state3.scrollLeft,\n            _scrollTop = _this$state3.scrollTop,\n            _scrollUpdateWasRequested = _this$state3.scrollUpdateWasRequested,\n            _verticalScrollDirection = _this$state3.verticalScrollDirection;\n\n        this._callOnScroll(_scrollLeft, _scrollTop, _horizontalScrollDirection, _verticalScrollDirection, _scrollUpdateWasRequested);\n      }\n    }; // Lazily create and cache item styles while scrolling,\n    // So that pure component sCU will prevent re-renders.\n    // We maintain this cache, and pass a style prop rather than index,\n    // So that List can clear cached styles and force item re-render if necessary.\n\n\n    _proto._getHorizontalRangeToRender = function _getHorizontalRangeToRender() {\n      var _this$props6 = this.props,\n          columnCount = _this$props6.columnCount,\n          overscanColumnCount = _this$props6.overscanColumnCount,\n          overscanColumnsCount = _this$props6.overscanColumnsCount,\n          overscanCount = _this$props6.overscanCount,\n          rowCount = _this$props6.rowCount;\n      var _this$state4 = this.state,\n          horizontalScrollDirection = _this$state4.horizontalScrollDirection,\n          isScrolling = _this$state4.isScrolling,\n          scrollLeft = _this$state4.scrollLeft;\n      var overscanCountResolved = overscanColumnCount || overscanColumnsCount || overscanCount || 1;\n\n      if (columnCount === 0 || rowCount === 0) {\n        return [0, 0, 0, 0];\n      }\n\n      var startIndex = getColumnStartIndexForOffset(this.props, scrollLeft, this._instanceProps);\n      var stopIndex = getColumnStopIndexForStartIndex(this.props, startIndex, scrollLeft, this._instanceProps); // Overscan by one item in each direction so that tab/focus works.\n      // If there isn't at least one extra item, tab loops back around.\n\n      var overscanBackward = !isScrolling || horizontalScrollDirection === 'backward' ? Math.max(1, overscanCountResolved) : 1;\n      var overscanForward = !isScrolling || horizontalScrollDirection === 'forward' ? Math.max(1, overscanCountResolved) : 1;\n      return [Math.max(0, startIndex - overscanBackward), Math.max(0, Math.min(columnCount - 1, stopIndex + overscanForward)), startIndex, stopIndex];\n    };\n\n    _proto._getVerticalRangeToRender = function _getVerticalRangeToRender() {\n      var _this$props7 = this.props,\n          columnCount = _this$props7.columnCount,\n          overscanCount = _this$props7.overscanCount,\n          overscanRowCount = _this$props7.overscanRowCount,\n          overscanRowsCount = _this$props7.overscanRowsCount,\n          rowCount = _this$props7.rowCount;\n      var _this$state5 = this.state,\n          isScrolling = _this$state5.isScrolling,\n          verticalScrollDirection = _this$state5.verticalScrollDirection,\n          scrollTop = _this$state5.scrollTop;\n      var overscanCountResolved = overscanRowCount || overscanRowsCount || overscanCount || 1;\n\n      if (columnCount === 0 || rowCount === 0) {\n        return [0, 0, 0, 0];\n      }\n\n      var startIndex = getRowStartIndexForOffset(this.props, scrollTop, this._instanceProps);\n      var stopIndex = getRowStopIndexForStartIndex(this.props, startIndex, scrollTop, this._instanceProps); // Overscan by one item in each direction so that tab/focus works.\n      // If there isn't at least one extra item, tab loops back around.\n\n      var overscanBackward = !isScrolling || verticalScrollDirection === 'backward' ? Math.max(1, overscanCountResolved) : 1;\n      var overscanForward = !isScrolling || verticalScrollDirection === 'forward' ? Math.max(1, overscanCountResolved) : 1;\n      return [Math.max(0, startIndex - overscanBackward), Math.max(0, Math.min(rowCount - 1, stopIndex + overscanForward)), startIndex, stopIndex];\n    };\n\n    return Grid;\n  }(PureComponent), _class.defaultProps = {\n    direction: 'ltr',\n    itemData: undefined,\n    useIsScrolling: false\n  }, _temp;\n}\n\nvar validateSharedProps = function validateSharedProps(_ref5, _ref6) {\n  var children = _ref5.children,\n      direction = _ref5.direction,\n      height = _ref5.height,\n      innerTagName = _ref5.innerTagName,\n      outerTagName = _ref5.outerTagName,\n      overscanColumnsCount = _ref5.overscanColumnsCount,\n      overscanCount = _ref5.overscanCount,\n      overscanRowsCount = _ref5.overscanRowsCount,\n      width = _ref5.width;\n  var instance = _ref6.instance;\n\n  if (process.env.NODE_ENV !== 'production') {\n    if (typeof overscanCount === 'number') {\n      if (devWarningsOverscanCount && !devWarningsOverscanCount.has(instance)) {\n        devWarningsOverscanCount.add(instance);\n        console.warn('The overscanCount prop has been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');\n      }\n    }\n\n    if (typeof overscanColumnsCount === 'number' || typeof overscanRowsCount === 'number') {\n      if (devWarningsOverscanRowsColumnsCount && !devWarningsOverscanRowsColumnsCount.has(instance)) {\n        devWarningsOverscanRowsColumnsCount.add(instance);\n        console.warn('The overscanColumnsCount and overscanRowsCount props have been deprecated. ' + 'Please use the overscanColumnCount and overscanRowCount props instead.');\n      }\n    }\n\n    if (innerTagName != null || outerTagName != null) {\n      if (devWarningsTagName && !devWarningsTagName.has(instance)) {\n        devWarningsTagName.add(instance);\n        console.warn('The innerTagName and outerTagName props have been deprecated. ' + 'Please use the innerElementType and outerElementType props instead.');\n      }\n    }\n\n    if (children == null) {\n      throw Error('An invalid \"children\" prop has been specified. ' + 'Value should be a React component. ' + (\"\\\"\" + (children === null ? 'null' : typeof children) + \"\\\" was specified.\"));\n    }\n\n    switch (direction) {\n      case 'ltr':\n      case 'rtl':\n        // Valid values\n        break;\n\n      default:\n        throw Error('An invalid \"direction\" prop has been specified. ' + 'Value should be either \"ltr\" or \"rtl\". ' + (\"\\\"\" + direction + \"\\\" was specified.\"));\n    }\n\n    if (typeof width !== 'number') {\n      throw Error('An invalid \"width\" prop has been specified. ' + 'Grids must specify a number for width. ' + (\"\\\"\" + (width === null ? 'null' : typeof width) + \"\\\" was specified.\"));\n    }\n\n    if (typeof height !== 'number') {\n      throw Error('An invalid \"height\" prop has been specified. ' + 'Grids must specify a number for height. ' + (\"\\\"\" + (height === null ? 'null' : typeof height) + \"\\\" was specified.\"));\n    }\n  }\n};\n\nvar DEFAULT_ESTIMATED_ITEM_SIZE = 50;\n\nvar getEstimatedTotalHeight = function getEstimatedTotalHeight(_ref, _ref2) {\n  var rowCount = _ref.rowCount;\n  var rowMetadataMap = _ref2.rowMetadataMap,\n      estimatedRowHeight = _ref2.estimatedRowHeight,\n      lastMeasuredRowIndex = _ref2.lastMeasuredRowIndex;\n  var totalSizeOfMeasuredRows = 0; // Edge case check for when the number of items decreases while a scroll is in progress.\n  // https://github.com/bvaughn/react-window/pull/138\n\n  if (lastMeasuredRowIndex >= rowCount) {\n    lastMeasuredRowIndex = rowCount - 1;\n  }\n\n  if (lastMeasuredRowIndex >= 0) {\n    var itemMetadata = rowMetadataMap[lastMeasuredRowIndex];\n    totalSizeOfMeasuredRows = itemMetadata.offset + itemMetadata.size;\n  }\n\n  var numUnmeasuredItems = rowCount - lastMeasuredRowIndex - 1;\n  var totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedRowHeight;\n  return totalSizeOfMeasuredRows + totalSizeOfUnmeasuredItems;\n};\n\nvar getEstimatedTotalWidth = function getEstimatedTotalWidth(_ref3, _ref4) {\n  var columnCount = _ref3.columnCount;\n  var columnMetadataMap = _ref4.columnMetadataMap,\n      estimatedColumnWidth = _ref4.estimatedColumnWidth,\n      lastMeasuredColumnIndex = _ref4.lastMeasuredColumnIndex;\n  var totalSizeOfMeasuredRows = 0; // Edge case check for when the number of items decreases while a scroll is in progress.\n  // https://github.com/bvaughn/react-window/pull/138\n\n  if (lastMeasuredColumnIndex >= columnCount) {\n    lastMeasuredColumnIndex = columnCount - 1;\n  }\n\n  if (lastMeasuredColumnIndex >= 0) {\n    var itemMetadata = columnMetadataMap[lastMeasuredColumnIndex];\n    totalSizeOfMeasuredRows = itemMetadata.offset + itemMetadata.size;\n  }\n\n  var numUnmeasuredItems = columnCount - lastMeasuredColumnIndex - 1;\n  var totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedColumnWidth;\n  return totalSizeOfMeasuredRows + totalSizeOfUnmeasuredItems;\n};\n\nvar getItemMetadata = function getItemMetadata(itemType, props, index, instanceProps) {\n  var itemMetadataMap, itemSize, lastMeasuredIndex;\n\n  if (itemType === 'column') {\n    itemMetadataMap = instanceProps.columnMetadataMap;\n    itemSize = props.columnWidth;\n    lastMeasuredIndex = instanceProps.lastMeasuredColumnIndex;\n  } else {\n    itemMetadataMap = instanceProps.rowMetadataMap;\n    itemSize = props.rowHeight;\n    lastMeasuredIndex = instanceProps.lastMeasuredRowIndex;\n  }\n\n  if (index > lastMeasuredIndex) {\n    var offset = 0;\n\n    if (lastMeasuredIndex >= 0) {\n      var itemMetadata = itemMetadataMap[lastMeasuredIndex];\n      offset = itemMetadata.offset + itemMetadata.size;\n    }\n\n    for (var i = lastMeasuredIndex + 1; i <= index; i++) {\n      var size = itemSize(i);\n      itemMetadataMap[i] = {\n        offset: offset,\n        size: size\n      };\n      offset += size;\n    }\n\n    if (itemType === 'column') {\n      instanceProps.lastMeasuredColumnIndex = index;\n    } else {\n      instanceProps.lastMeasuredRowIndex = index;\n    }\n  }\n\n  return itemMetadataMap[index];\n};\n\nvar findNearestItem = function findNearestItem(itemType, props, instanceProps, offset) {\n  var itemMetadataMap, lastMeasuredIndex;\n\n  if (itemType === 'column') {\n    itemMetadataMap = instanceProps.columnMetadataMap;\n    lastMeasuredIndex = instanceProps.lastMeasuredColumnIndex;\n  } else {\n    itemMetadataMap = instanceProps.rowMetadataMap;\n    lastMeasuredIndex = instanceProps.lastMeasuredRowIndex;\n  }\n\n  var lastMeasuredItemOffset = lastMeasuredIndex > 0 ? itemMetadataMap[lastMeasuredIndex].offset : 0;\n\n  if (lastMeasuredItemOffset >= offset) {\n    // If we've already measured items within this range just use a binary search as it's faster.\n    return findNearestItemBinarySearch(itemType, props, instanceProps, lastMeasuredIndex, 0, offset);\n  } else {\n    // If we haven't yet measured this high, fallback to an exponential search with an inner binary search.\n    // The exponential search avoids pre-computing sizes for the full set of items as a binary search would.\n    // The overall complexity for this approach is O(log n).\n    return findNearestItemExponentialSearch(itemType, props, instanceProps, Math.max(0, lastMeasuredIndex), offset);\n  }\n};\n\nvar findNearestItemBinarySearch = function findNearestItemBinarySearch(itemType, props, instanceProps, high, low, offset) {\n  while (low <= high) {\n    var middle = low + Math.floor((high - low) / 2);\n    var currentOffset = getItemMetadata(itemType, props, middle, instanceProps).offset;\n\n    if (currentOffset === offset) {\n      return middle;\n    } else if (currentOffset < offset) {\n      low = middle + 1;\n    } else if (currentOffset > offset) {\n      high = middle - 1;\n    }\n  }\n\n  if (low > 0) {\n    return low - 1;\n  } else {\n    return 0;\n  }\n};\n\nvar findNearestItemExponentialSearch = function findNearestItemExponentialSearch(itemType, props, instanceProps, index, offset) {\n  var itemCount = itemType === 'column' ? props.columnCount : props.rowCount;\n  var interval = 1;\n\n  while (index < itemCount && getItemMetadata(itemType, props, index, instanceProps).offset < offset) {\n    index += interval;\n    interval *= 2;\n  }\n\n  return findNearestItemBinarySearch(itemType, props, instanceProps, Math.min(index, itemCount - 1), Math.floor(index / 2), offset);\n};\n\nvar getOffsetForIndexAndAlignment = function getOffsetForIndexAndAlignment(itemType, props, index, align, scrollOffset, instanceProps, scrollbarSize) {\n  var size = itemType === 'column' ? props.width : props.height;\n  var itemMetadata = getItemMetadata(itemType, props, index, instanceProps); // Get estimated total size after ItemMetadata is computed,\n  // To ensure it reflects actual measurements instead of just estimates.\n\n  var estimatedTotalSize = itemType === 'column' ? getEstimatedTotalWidth(props, instanceProps) : getEstimatedTotalHeight(props, instanceProps);\n  var maxOffset = Math.max(0, Math.min(estimatedTotalSize - size, itemMetadata.offset));\n  var minOffset = Math.max(0, itemMetadata.offset - size + scrollbarSize + itemMetadata.size);\n\n  if (align === 'smart') {\n    if (scrollOffset >= minOffset - size && scrollOffset <= maxOffset + size) {\n      align = 'auto';\n    } else {\n      align = 'center';\n    }\n  }\n\n  switch (align) {\n    case 'start':\n      return maxOffset;\n\n    case 'end':\n      return minOffset;\n\n    case 'center':\n      return Math.round(minOffset + (maxOffset - minOffset) / 2);\n\n    case 'auto':\n    default:\n      if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n        return scrollOffset;\n      } else if (minOffset > maxOffset) {\n        // Because we only take into account the scrollbar size when calculating minOffset\n        // this value can be larger than maxOffset when at the end of the list\n        return minOffset;\n      } else if (scrollOffset < minOffset) {\n        return minOffset;\n      } else {\n        return maxOffset;\n      }\n\n  }\n};\n\nvar VariableSizeGrid =\n/*#__PURE__*/\ncreateGridComponent({\n  getColumnOffset: function getColumnOffset(props, index, instanceProps) {\n    return getItemMetadata('column', props, index, instanceProps).offset;\n  },\n  getColumnStartIndexForOffset: function getColumnStartIndexForOffset(props, scrollLeft, instanceProps) {\n    return findNearestItem('column', props, instanceProps, scrollLeft);\n  },\n  getColumnStopIndexForStartIndex: function getColumnStopIndexForStartIndex(props, startIndex, scrollLeft, instanceProps) {\n    var columnCount = props.columnCount,\n        width = props.width;\n    var itemMetadata = getItemMetadata('column', props, startIndex, instanceProps);\n    var maxOffset = scrollLeft + width;\n    var offset = itemMetadata.offset + itemMetadata.size;\n    var stopIndex = startIndex;\n\n    while (stopIndex < columnCount - 1 && offset < maxOffset) {\n      stopIndex++;\n      offset += getItemMetadata('column', props, stopIndex, instanceProps).size;\n    }\n\n    return stopIndex;\n  },\n  getColumnWidth: function getColumnWidth(props, index, instanceProps) {\n    return instanceProps.columnMetadataMap[index].size;\n  },\n  getEstimatedTotalHeight: getEstimatedTotalHeight,\n  getEstimatedTotalWidth: getEstimatedTotalWidth,\n  getOffsetForColumnAndAlignment: function getOffsetForColumnAndAlignment(props, index, align, scrollOffset, instanceProps, scrollbarSize) {\n    return getOffsetForIndexAndAlignment('column', props, index, align, scrollOffset, instanceProps, scrollbarSize);\n  },\n  getOffsetForRowAndAlignment: function getOffsetForRowAndAlignment(props, index, align, scrollOffset, instanceProps, scrollbarSize) {\n    return getOffsetForIndexAndAlignment('row', props, index, align, scrollOffset, instanceProps, scrollbarSize);\n  },\n  getRowOffset: function getRowOffset(props, index, instanceProps) {\n    return getItemMetadata('row', props, index, instanceProps).offset;\n  },\n  getRowHeight: function getRowHeight(props, index, instanceProps) {\n    return instanceProps.rowMetadataMap[index].size;\n  },\n  getRowStartIndexForOffset: function getRowStartIndexForOffset(props, scrollTop, instanceProps) {\n    return findNearestItem('row', props, instanceProps, scrollTop);\n  },\n  getRowStopIndexForStartIndex: function getRowStopIndexForStartIndex(props, startIndex, scrollTop, instanceProps) {\n    var rowCount = props.rowCount,\n        height = props.height;\n    var itemMetadata = getItemMetadata('row', props, startIndex, instanceProps);\n    var maxOffset = scrollTop + height;\n    var offset = itemMetadata.offset + itemMetadata.size;\n    var stopIndex = startIndex;\n\n    while (stopIndex < rowCount - 1 && offset < maxOffset) {\n      stopIndex++;\n      offset += getItemMetadata('row', props, stopIndex, instanceProps).size;\n    }\n\n    return stopIndex;\n  },\n  initInstanceProps: function initInstanceProps(props, instance) {\n    var _ref5 = props,\n        estimatedColumnWidth = _ref5.estimatedColumnWidth,\n        estimatedRowHeight = _ref5.estimatedRowHeight;\n    var instanceProps = {\n      columnMetadataMap: {},\n      estimatedColumnWidth: estimatedColumnWidth || DEFAULT_ESTIMATED_ITEM_SIZE,\n      estimatedRowHeight: estimatedRowHeight || DEFAULT_ESTIMATED_ITEM_SIZE,\n      lastMeasuredColumnIndex: -1,\n      lastMeasuredRowIndex: -1,\n      rowMetadataMap: {}\n    };\n\n    instance.resetAfterColumnIndex = function (columnIndex, shouldForceUpdate) {\n      if (shouldForceUpdate === void 0) {\n        shouldForceUpdate = true;\n      }\n\n      instance.resetAfterIndices({\n        columnIndex: columnIndex,\n        shouldForceUpdate: shouldForceUpdate\n      });\n    };\n\n    instance.resetAfterRowIndex = function (rowIndex, shouldForceUpdate) {\n      if (shouldForceUpdate === void 0) {\n        shouldForceUpdate = true;\n      }\n\n      instance.resetAfterIndices({\n        rowIndex: rowIndex,\n        shouldForceUpdate: shouldForceUpdate\n      });\n    };\n\n    instance.resetAfterIndices = function (_ref6) {\n      var columnIndex = _ref6.columnIndex,\n          rowIndex = _ref6.rowIndex,\n          _ref6$shouldForceUpda = _ref6.shouldForceUpdate,\n          shouldForceUpdate = _ref6$shouldForceUpda === void 0 ? true : _ref6$shouldForceUpda;\n\n      if (typeof columnIndex === 'number') {\n        instanceProps.lastMeasuredColumnIndex = Math.min(instanceProps.lastMeasuredColumnIndex, columnIndex - 1);\n      }\n\n      if (typeof rowIndex === 'number') {\n        instanceProps.lastMeasuredRowIndex = Math.min(instanceProps.lastMeasuredRowIndex, rowIndex - 1);\n      } // We could potentially optimize further by only evicting styles after this index,\n      // But since styles are only cached while scrolling is in progress-\n      // It seems an unnecessary optimization.\n      // It's unlikely that resetAfterIndex() will be called while a user is scrolling.\n\n\n      instance._getItemStyleCache(-1);\n\n      if (shouldForceUpdate) {\n        instance.forceUpdate();\n      }\n    };\n\n    return instanceProps;\n  },\n  shouldResetStyleCacheOnItemSizeChange: false,\n  validateProps: function validateProps(_ref7) {\n    var columnWidth = _ref7.columnWidth,\n        rowHeight = _ref7.rowHeight;\n\n    if (process.env.NODE_ENV !== 'production') {\n      if (typeof columnWidth !== 'function') {\n        throw Error('An invalid \"columnWidth\" prop has been specified. ' + 'Value should be a function. ' + (\"\\\"\" + (columnWidth === null ? 'null' : typeof columnWidth) + \"\\\" was specified.\"));\n      } else if (typeof rowHeight !== 'function') {\n        throw Error('An invalid \"rowHeight\" prop has been specified. ' + 'Value should be a function. ' + (\"\\\"\" + (rowHeight === null ? 'null' : typeof rowHeight) + \"\\\" was specified.\"));\n      }\n    }\n  }\n});\n\nvar IS_SCROLLING_DEBOUNCE_INTERVAL$1 = 150;\n\nvar defaultItemKey$1 = function defaultItemKey(index, data) {\n  return index;\n}; // In DEV mode, this Set helps us only log a warning once per component instance.\n// This avoids spamming the console every time a render happens.\n\n\nvar devWarningsDirection = null;\nvar devWarningsTagName$1 = null;\n\nif (process.env.NODE_ENV !== 'production') {\n  if (typeof window !== 'undefined' && typeof window.WeakSet !== 'undefined') {\n    devWarningsDirection =\n    /*#__PURE__*/\n    new WeakSet();\n    devWarningsTagName$1 =\n    /*#__PURE__*/\n    new WeakSet();\n  }\n}\n\nfunction createListComponent(_ref) {\n  var _class, _temp;\n\n  var getItemOffset = _ref.getItemOffset,\n      getEstimatedTotalSize = _ref.getEstimatedTotalSize,\n      getItemSize = _ref.getItemSize,\n      getOffsetForIndexAndAlignment = _ref.getOffsetForIndexAndAlignment,\n      getStartIndexForOffset = _ref.getStartIndexForOffset,\n      getStopIndexForStartIndex = _ref.getStopIndexForStartIndex,\n      initInstanceProps = _ref.initInstanceProps,\n      shouldResetStyleCacheOnItemSizeChange = _ref.shouldResetStyleCacheOnItemSizeChange,\n      validateProps = _ref.validateProps;\n  return _temp = _class =\n  /*#__PURE__*/\n  function (_PureComponent) {\n    _inheritsLoose(List, _PureComponent);\n\n    // Always use explicit constructor for React components.\n    // It produces less code after transpilation. (#26)\n    // eslint-disable-next-line no-useless-constructor\n    function List(props) {\n      var _this;\n\n      _this = _PureComponent.call(this, props) || this;\n      _this._instanceProps = initInstanceProps(_this.props, _assertThisInitialized(_assertThisInitialized(_this)));\n      _this._outerRef = void 0;\n      _this._resetIsScrollingTimeoutId = null;\n      _this.state = {\n        instance: _assertThisInitialized(_assertThisInitialized(_this)),\n        isScrolling: false,\n        scrollDirection: 'forward',\n        scrollOffset: typeof _this.props.initialScrollOffset === 'number' ? _this.props.initialScrollOffset : 0,\n        scrollUpdateWasRequested: false\n      };\n      _this._callOnItemsRendered = void 0;\n      _this._callOnItemsRendered = memoizeOne(function (overscanStartIndex, overscanStopIndex, visibleStartIndex, visibleStopIndex) {\n        return _this.props.onItemsRendered({\n          overscanStartIndex: overscanStartIndex,\n          overscanStopIndex: overscanStopIndex,\n          visibleStartIndex: visibleStartIndex,\n          visibleStopIndex: visibleStopIndex\n        });\n      });\n      _this._callOnScroll = void 0;\n      _this._callOnScroll = memoizeOne(function (scrollDirection, scrollOffset, scrollUpdateWasRequested) {\n        return _this.props.onScroll({\n          scrollDirection: scrollDirection,\n          scrollOffset: scrollOffset,\n          scrollUpdateWasRequested: scrollUpdateWasRequested\n        });\n      });\n      _this._getItemStyle = void 0;\n\n      _this._getItemStyle = function (index) {\n        var _this$props = _this.props,\n            direction = _this$props.direction,\n            itemSize = _this$props.itemSize,\n            layout = _this$props.layout;\n\n        var itemStyleCache = _this._getItemStyleCache(shouldResetStyleCacheOnItemSizeChange && itemSize, shouldResetStyleCacheOnItemSizeChange && layout, shouldResetStyleCacheOnItemSizeChange && direction);\n\n        var style;\n\n        if (itemStyleCache.hasOwnProperty(index)) {\n          style = itemStyleCache[index];\n        } else {\n          var _offset = getItemOffset(_this.props, index, _this._instanceProps);\n\n          var size = getItemSize(_this.props, index, _this._instanceProps); // TODO Deprecate direction \"horizontal\"\n\n          var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n          var isRtl = direction === 'rtl';\n          var offsetHorizontal = isHorizontal ? _offset : 0;\n          itemStyleCache[index] = style = {\n            position: 'absolute',\n            left: isRtl ? undefined : offsetHorizontal,\n            right: isRtl ? offsetHorizontal : undefined,\n            top: !isHorizontal ? _offset : 0,\n            height: !isHorizontal ? size : '100%',\n            width: isHorizontal ? size : '100%'\n          };\n        }\n\n        return style;\n      };\n\n      _this._getItemStyleCache = void 0;\n      _this._getItemStyleCache = memoizeOne(function (_, __, ___) {\n        return {};\n      });\n\n      _this._onScrollHorizontal = function (event) {\n        var _event$currentTarget = event.currentTarget,\n            clientWidth = _event$currentTarget.clientWidth,\n            scrollLeft = _event$currentTarget.scrollLeft,\n            scrollWidth = _event$currentTarget.scrollWidth;\n\n        _this.setState(function (prevState) {\n          if (prevState.scrollOffset === scrollLeft) {\n            // Scroll position may have been updated by cDM/cDU,\n            // In which case we don't need to trigger another render,\n            // And we don't want to update state.isScrolling.\n            return null;\n          }\n\n          var direction = _this.props.direction;\n          var scrollOffset = scrollLeft;\n\n          if (direction === 'rtl') {\n            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n            // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n            // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n            switch (getRTLOffsetType()) {\n              case 'negative':\n                scrollOffset = -scrollLeft;\n                break;\n\n              case 'positive-descending':\n                scrollOffset = scrollWidth - clientWidth - scrollLeft;\n                break;\n            }\n          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n\n\n          scrollOffset = Math.max(0, Math.min(scrollOffset, scrollWidth - clientWidth));\n          return {\n            isScrolling: true,\n            scrollDirection: prevState.scrollOffset < scrollLeft ? 'forward' : 'backward',\n            scrollOffset: scrollOffset,\n            scrollUpdateWasRequested: false\n          };\n        }, _this._resetIsScrollingDebounced);\n      };\n\n      _this._onScrollVertical = function (event) {\n        var _event$currentTarget2 = event.currentTarget,\n            clientHeight = _event$currentTarget2.clientHeight,\n            scrollHeight = _event$currentTarget2.scrollHeight,\n            scrollTop = _event$currentTarget2.scrollTop;\n\n        _this.setState(function (prevState) {\n          if (prevState.scrollOffset === scrollTop) {\n            // Scroll position may have been updated by cDM/cDU,\n            // In which case we don't need to trigger another render,\n            // And we don't want to update state.isScrolling.\n            return null;\n          } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n\n\n          var scrollOffset = Math.max(0, Math.min(scrollTop, scrollHeight - clientHeight));\n          return {\n            isScrolling: true,\n            scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n            scrollOffset: scrollOffset,\n            scrollUpdateWasRequested: false\n          };\n        }, _this._resetIsScrollingDebounced);\n      };\n\n      _this._outerRefSetter = function (ref) {\n        var outerRef = _this.props.outerRef;\n        _this._outerRef = ref;\n\n        if (typeof outerRef === 'function') {\n          outerRef(ref);\n        } else if (outerRef != null && typeof outerRef === 'object' && outerRef.hasOwnProperty('current')) {\n          outerRef.current = ref;\n        }\n      };\n\n      _this._resetIsScrollingDebounced = function () {\n        if (_this._resetIsScrollingTimeoutId !== null) {\n          cancelTimeout(_this._resetIsScrollingTimeoutId);\n        }\n\n        _this._resetIsScrollingTimeoutId = requestTimeout(_this._resetIsScrolling, IS_SCROLLING_DEBOUNCE_INTERVAL$1);\n      };\n\n      _this._resetIsScrolling = function () {\n        _this._resetIsScrollingTimeoutId = null;\n\n        _this.setState({\n          isScrolling: false\n        }, function () {\n          // Clear style cache after state update has been committed.\n          // This way we don't break pure sCU for items that don't use isScrolling param.\n          _this._getItemStyleCache(-1, null);\n        });\n      };\n\n      return _this;\n    }\n\n    List.getDerivedStateFromProps = function getDerivedStateFromProps(nextProps, prevState) {\n      validateSharedProps$1(nextProps, prevState);\n      validateProps(nextProps);\n      return null;\n    };\n\n    var _proto = List.prototype;\n\n    _proto.scrollTo = function scrollTo(scrollOffset) {\n      scrollOffset = Math.max(0, scrollOffset);\n      this.setState(function (prevState) {\n        if (prevState.scrollOffset === scrollOffset) {\n          return null;\n        }\n\n        return {\n          scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n          scrollOffset: scrollOffset,\n          scrollUpdateWasRequested: true\n        };\n      }, this._resetIsScrollingDebounced);\n    };\n\n    _proto.scrollToItem = function scrollToItem(index, align) {\n      if (align === void 0) {\n        align = 'auto';\n      }\n\n      var itemCount = this.props.itemCount;\n      var scrollOffset = this.state.scrollOffset;\n      index = Math.max(0, Math.min(index, itemCount - 1));\n      this.scrollTo(getOffsetForIndexAndAlignment(this.props, index, align, scrollOffset, this._instanceProps));\n    };\n\n    _proto.componentDidMount = function componentDidMount() {\n      var _this$props2 = this.props,\n          direction = _this$props2.direction,\n          initialScrollOffset = _this$props2.initialScrollOffset,\n          layout = _this$props2.layout;\n\n      if (typeof initialScrollOffset === 'number' && this._outerRef != null) {\n        var outerRef = this._outerRef; // TODO Deprecate direction \"horizontal\"\n\n        if (direction === 'horizontal' || layout === 'horizontal') {\n          outerRef.scrollLeft = initialScrollOffset;\n        } else {\n          outerRef.scrollTop = initialScrollOffset;\n        }\n      }\n\n      this._callPropsCallbacks();\n    };\n\n    _proto.componentDidUpdate = function componentDidUpdate() {\n      var _this$props3 = this.props,\n          direction = _this$props3.direction,\n          layout = _this$props3.layout;\n      var _this$state = this.state,\n          scrollOffset = _this$state.scrollOffset,\n          scrollUpdateWasRequested = _this$state.scrollUpdateWasRequested;\n\n      if (scrollUpdateWasRequested && this._outerRef != null) {\n        var outerRef = this._outerRef; // TODO Deprecate direction \"horizontal\"\n\n        if (direction === 'horizontal' || layout === 'horizontal') {\n          if (direction === 'rtl') {\n            // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n            // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n            // So we need to determine which browser behavior we're dealing with, and mimic it.\n            switch (getRTLOffsetType()) {\n              case 'negative':\n                outerRef.scrollLeft = -scrollOffset;\n                break;\n\n              case 'positive-ascending':\n                outerRef.scrollLeft = scrollOffset;\n                break;\n\n              default:\n                var clientWidth = outerRef.clientWidth,\n                    scrollWidth = outerRef.scrollWidth;\n                outerRef.scrollLeft = scrollWidth - clientWidth - scrollOffset;\n                break;\n            }\n          } else {\n            outerRef.scrollLeft = scrollOffset;\n          }\n        } else {\n          outerRef.scrollTop = scrollOffset;\n        }\n      }\n\n      this._callPropsCallbacks();\n    };\n\n    _proto.componentWillUnmount = function componentWillUnmount() {\n      if (this._resetIsScrollingTimeoutId !== null) {\n        cancelTimeout(this._resetIsScrollingTimeoutId);\n      }\n    };\n\n    _proto.render = function render() {\n      var _this$props4 = this.props,\n          children = _this$props4.children,\n          className = _this$props4.className,\n          direction = _this$props4.direction,\n          height = _this$props4.height,\n          innerRef = _this$props4.innerRef,\n          innerElementType = _this$props4.innerElementType,\n          innerTagName = _this$props4.innerTagName,\n          itemCount = _this$props4.itemCount,\n          itemData = _this$props4.itemData,\n          _this$props4$itemKey = _this$props4.itemKey,\n          itemKey = _this$props4$itemKey === void 0 ? defaultItemKey$1 : _this$props4$itemKey,\n          layout = _this$props4.layout,\n          outerElementType = _this$props4.outerElementType,\n          outerTagName = _this$props4.outerTagName,\n          style = _this$props4.style,\n          useIsScrolling = _this$props4.useIsScrolling,\n          width = _this$props4.width;\n      var isScrolling = this.state.isScrolling; // TODO Deprecate direction \"horizontal\"\n\n      var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n      var onScroll = isHorizontal ? this._onScrollHorizontal : this._onScrollVertical;\n\n      var _this$_getRangeToRend = this._getRangeToRender(),\n          startIndex = _this$_getRangeToRend[0],\n          stopIndex = _this$_getRangeToRend[1];\n\n      var items = [];\n\n      if (itemCount > 0) {\n        for (var _index = startIndex; _index <= stopIndex; _index++) {\n          items.push(createElement(children, {\n            data: itemData,\n            key: itemKey(_index, itemData),\n            index: _index,\n            isScrolling: useIsScrolling ? isScrolling : undefined,\n            style: this._getItemStyle(_index)\n          }));\n        }\n      } // Read this value AFTER items have been created,\n      // So their actual sizes (if variable) are taken into consideration.\n\n\n      var estimatedTotalSize = getEstimatedTotalSize(this.props, this._instanceProps);\n      return createElement(outerElementType || outerTagName || 'div', {\n        className: className,\n        onScroll: onScroll,\n        ref: this._outerRefSetter,\n        style: _extends({\n          position: 'relative',\n          height: height,\n          width: width,\n          overflow: 'auto',\n          WebkitOverflowScrolling: 'touch',\n          willChange: 'transform',\n          direction: direction\n        }, style)\n      }, createElement(innerElementType || innerTagName || 'div', {\n        children: items,\n        ref: innerRef,\n        style: {\n          height: isHorizontal ? '100%' : estimatedTotalSize,\n          pointerEvents: isScrolling ? 'none' : undefined,\n          width: isHorizontal ? estimatedTotalSize : '100%'\n        }\n      }));\n    };\n\n    _proto._callPropsCallbacks = function _callPropsCallbacks() {\n      if (typeof this.props.onItemsRendered === 'function') {\n        var itemCount = this.props.itemCount;\n\n        if (itemCount > 0) {\n          var _this$_getRangeToRend2 = this._getRangeToRender(),\n              _overscanStartIndex = _this$_getRangeToRend2[0],\n              _overscanStopIndex = _this$_getRangeToRend2[1],\n              _visibleStartIndex = _this$_getRangeToRend2[2],\n              _visibleStopIndex = _this$_getRangeToRend2[3];\n\n          this._callOnItemsRendered(_overscanStartIndex, _overscanStopIndex, _visibleStartIndex, _visibleStopIndex);\n        }\n      }\n\n      if (typeof this.props.onScroll === 'function') {\n        var _this$state2 = this.state,\n            _scrollDirection = _this$state2.scrollDirection,\n            _scrollOffset = _this$state2.scrollOffset,\n            _scrollUpdateWasRequested = _this$state2.scrollUpdateWasRequested;\n\n        this._callOnScroll(_scrollDirection, _scrollOffset, _scrollUpdateWasRequested);\n      }\n    }; // Lazily create and cache item styles while scrolling,\n    // So that pure component sCU will prevent re-renders.\n    // We maintain this cache, and pass a style prop rather than index,\n    // So that List can clear cached styles and force item re-render if necessary.\n\n\n    _proto._getRangeToRender = function _getRangeToRender() {\n      var _this$props5 = this.props,\n          itemCount = _this$props5.itemCount,\n          overscanCount = _this$props5.overscanCount;\n      var _this$state3 = this.state,\n          isScrolling = _this$state3.isScrolling,\n          scrollDirection = _this$state3.scrollDirection,\n          scrollOffset = _this$state3.scrollOffset;\n\n      if (itemCount === 0) {\n        return [0, 0, 0, 0];\n      }\n\n      var startIndex = getStartIndexForOffset(this.props, scrollOffset, this._instanceProps);\n      var stopIndex = getStopIndexForStartIndex(this.props, startIndex, scrollOffset, this._instanceProps); // Overscan by one item in each direction so that tab/focus works.\n      // If there isn't at least one extra item, tab loops back around.\n\n      var overscanBackward = !isScrolling || scrollDirection === 'backward' ? Math.max(1, overscanCount) : 1;\n      var overscanForward = !isScrolling || scrollDirection === 'forward' ? Math.max(1, overscanCount) : 1;\n      return [Math.max(0, startIndex - overscanBackward), Math.max(0, Math.min(itemCount - 1, stopIndex + overscanForward)), startIndex, stopIndex];\n    };\n\n    return List;\n  }(PureComponent), _class.defaultProps = {\n    direction: 'ltr',\n    itemData: undefined,\n    layout: 'vertical',\n    overscanCount: 2,\n    useIsScrolling: false\n  }, _temp;\n} // NOTE: I considered further wrapping individual items with a pure ListItem component.\n// This would avoid ever calling the render function for the same index more than once,\n// But it would also add the overhead of a lot of components/fibers.\n// I assume people already do this (render function returning a class component),\n// So my doing it would just unnecessarily double the wrappers.\n\nvar validateSharedProps$1 = function validateSharedProps(_ref2, _ref3) {\n  var children = _ref2.children,\n      direction = _ref2.direction,\n      height = _ref2.height,\n      layout = _ref2.layout,\n      innerTagName = _ref2.innerTagName,\n      outerTagName = _ref2.outerTagName,\n      width = _ref2.width;\n  var instance = _ref3.instance;\n\n  if (process.env.NODE_ENV !== 'production') {\n    if (innerTagName != null || outerTagName != null) {\n      if (devWarningsTagName$1 && !devWarningsTagName$1.has(instance)) {\n        devWarningsTagName$1.add(instance);\n        console.warn('The innerTagName and outerTagName props have been deprecated. ' + 'Please use the innerElementType and outerElementType props instead.');\n      }\n    } // TODO Deprecate direction \"horizontal\"\n\n\n    var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n\n    switch (direction) {\n      case 'horizontal':\n      case 'vertical':\n        if (devWarningsDirection && !devWarningsDirection.has(instance)) {\n          devWarningsDirection.add(instance);\n          console.warn('The direction prop should be either \"ltr\" (default) or \"rtl\". ' + 'Please use the layout prop to specify \"vertical\" (default) or \"horizontal\" orientation.');\n        }\n\n        break;\n\n      case 'ltr':\n      case 'rtl':\n        // Valid values\n        break;\n\n      default:\n        throw Error('An invalid \"direction\" prop has been specified. ' + 'Value should be either \"ltr\" or \"rtl\". ' + (\"\\\"\" + direction + \"\\\" was specified.\"));\n    }\n\n    switch (layout) {\n      case 'horizontal':\n      case 'vertical':\n        // Valid values\n        break;\n\n      default:\n        throw Error('An invalid \"layout\" prop has been specified. ' + 'Value should be either \"horizontal\" or \"vertical\". ' + (\"\\\"\" + layout + \"\\\" was specified.\"));\n    }\n\n    if (children == null) {\n      throw Error('An invalid \"children\" prop has been specified. ' + 'Value should be a React component. ' + (\"\\\"\" + (children === null ? 'null' : typeof children) + \"\\\" was specified.\"));\n    }\n\n    if (isHorizontal && typeof width !== 'number') {\n      throw Error('An invalid \"width\" prop has been specified. ' + 'Horizontal lists must specify a number for width. ' + (\"\\\"\" + (width === null ? 'null' : typeof width) + \"\\\" was specified.\"));\n    } else if (!isHorizontal && typeof height !== 'number') {\n      throw Error('An invalid \"height\" prop has been specified. ' + 'Vertical lists must specify a number for height. ' + (\"\\\"\" + (height === null ? 'null' : typeof height) + \"\\\" was specified.\"));\n    }\n  }\n};\n\nvar DEFAULT_ESTIMATED_ITEM_SIZE$1 = 50;\n\nvar getItemMetadata$1 = function getItemMetadata(props, index, instanceProps) {\n  var _ref = props,\n      itemSize = _ref.itemSize;\n  var itemMetadataMap = instanceProps.itemMetadataMap,\n      lastMeasuredIndex = instanceProps.lastMeasuredIndex;\n\n  if (index > lastMeasuredIndex) {\n    var offset = 0;\n\n    if (lastMeasuredIndex >= 0) {\n      var itemMetadata = itemMetadataMap[lastMeasuredIndex];\n      offset = itemMetadata.offset + itemMetadata.size;\n    }\n\n    for (var i = lastMeasuredIndex + 1; i <= index; i++) {\n      var size = itemSize(i);\n      itemMetadataMap[i] = {\n        offset: offset,\n        size: size\n      };\n      offset += size;\n    }\n\n    instanceProps.lastMeasuredIndex = index;\n  }\n\n  return itemMetadataMap[index];\n};\n\nvar findNearestItem$1 = function findNearestItem(props, instanceProps, offset) {\n  var itemMetadataMap = instanceProps.itemMetadataMap,\n      lastMeasuredIndex = instanceProps.lastMeasuredIndex;\n  var lastMeasuredItemOffset = lastMeasuredIndex > 0 ? itemMetadataMap[lastMeasuredIndex].offset : 0;\n\n  if (lastMeasuredItemOffset >= offset) {\n    // If we've already measured items within this range just use a binary search as it's faster.\n    return findNearestItemBinarySearch$1(props, instanceProps, lastMeasuredIndex, 0, offset);\n  } else {\n    // If we haven't yet measured this high, fallback to an exponential search with an inner binary search.\n    // The exponential search avoids pre-computing sizes for the full set of items as a binary search would.\n    // The overall complexity for this approach is O(log n).\n    return findNearestItemExponentialSearch$1(props, instanceProps, Math.max(0, lastMeasuredIndex), offset);\n  }\n};\n\nvar findNearestItemBinarySearch$1 = function findNearestItemBinarySearch(props, instanceProps, high, low, offset) {\n  while (low <= high) {\n    var middle = low + Math.floor((high - low) / 2);\n    var currentOffset = getItemMetadata$1(props, middle, instanceProps).offset;\n\n    if (currentOffset === offset) {\n      return middle;\n    } else if (currentOffset < offset) {\n      low = middle + 1;\n    } else if (currentOffset > offset) {\n      high = middle - 1;\n    }\n  }\n\n  if (low > 0) {\n    return low - 1;\n  } else {\n    return 0;\n  }\n};\n\nvar findNearestItemExponentialSearch$1 = function findNearestItemExponentialSearch(props, instanceProps, index, offset) {\n  var itemCount = props.itemCount;\n  var interval = 1;\n\n  while (index < itemCount && getItemMetadata$1(props, index, instanceProps).offset < offset) {\n    index += interval;\n    interval *= 2;\n  }\n\n  return findNearestItemBinarySearch$1(props, instanceProps, Math.min(index, itemCount - 1), Math.floor(index / 2), offset);\n};\n\nvar getEstimatedTotalSize = function getEstimatedTotalSize(_ref2, _ref3) {\n  var itemCount = _ref2.itemCount;\n  var itemMetadataMap = _ref3.itemMetadataMap,\n      estimatedItemSize = _ref3.estimatedItemSize,\n      lastMeasuredIndex = _ref3.lastMeasuredIndex;\n  var totalSizeOfMeasuredItems = 0; // Edge case check for when the number of items decreases while a scroll is in progress.\n  // https://github.com/bvaughn/react-window/pull/138\n\n  if (lastMeasuredIndex >= itemCount) {\n    lastMeasuredIndex = itemCount - 1;\n  }\n\n  if (lastMeasuredIndex >= 0) {\n    var itemMetadata = itemMetadataMap[lastMeasuredIndex];\n    totalSizeOfMeasuredItems = itemMetadata.offset + itemMetadata.size;\n  }\n\n  var numUnmeasuredItems = itemCount - lastMeasuredIndex - 1;\n  var totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedItemSize;\n  return totalSizeOfMeasuredItems + totalSizeOfUnmeasuredItems;\n};\n\nvar VariableSizeList =\n/*#__PURE__*/\ncreateListComponent({\n  getItemOffset: function getItemOffset(props, index, instanceProps) {\n    return getItemMetadata$1(props, index, instanceProps).offset;\n  },\n  getItemSize: function getItemSize(props, index, instanceProps) {\n    return instanceProps.itemMetadataMap[index].size;\n  },\n  getEstimatedTotalSize: getEstimatedTotalSize,\n  getOffsetForIndexAndAlignment: function getOffsetForIndexAndAlignment(props, index, align, scrollOffset, instanceProps) {\n    var direction = props.direction,\n        height = props.height,\n        layout = props.layout,\n        width = props.width; // TODO Deprecate direction \"horizontal\"\n\n    var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n    var size = isHorizontal ? width : height;\n    var itemMetadata = getItemMetadata$1(props, index, instanceProps); // Get estimated total size after ItemMetadata is computed,\n    // To ensure it reflects actual measurements instead of just estimates.\n\n    var estimatedTotalSize = getEstimatedTotalSize(props, instanceProps);\n    var maxOffset = Math.max(0, Math.min(estimatedTotalSize - size, itemMetadata.offset));\n    var minOffset = Math.max(0, itemMetadata.offset - size + itemMetadata.size);\n\n    if (align === 'smart') {\n      if (scrollOffset >= minOffset - size && scrollOffset <= maxOffset + size) {\n        align = 'auto';\n      } else {\n        align = 'center';\n      }\n    }\n\n    switch (align) {\n      case 'start':\n        return maxOffset;\n\n      case 'end':\n        return minOffset;\n\n      case 'center':\n        return Math.round(minOffset + (maxOffset - minOffset) / 2);\n\n      case 'auto':\n      default:\n        if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n          return scrollOffset;\n        } else if (scrollOffset < minOffset) {\n          return minOffset;\n        } else {\n          return maxOffset;\n        }\n\n    }\n  },\n  getStartIndexForOffset: function getStartIndexForOffset(props, offset, instanceProps) {\n    return findNearestItem$1(props, instanceProps, offset);\n  },\n  getStopIndexForStartIndex: function getStopIndexForStartIndex(props, startIndex, scrollOffset, instanceProps) {\n    var direction = props.direction,\n        height = props.height,\n        itemCount = props.itemCount,\n        layout = props.layout,\n        width = props.width; // TODO Deprecate direction \"horizontal\"\n\n    var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n    var size = isHorizontal ? width : height;\n    var itemMetadata = getItemMetadata$1(props, startIndex, instanceProps);\n    var maxOffset = scrollOffset + size;\n    var offset = itemMetadata.offset + itemMetadata.size;\n    var stopIndex = startIndex;\n\n    while (stopIndex < itemCount - 1 && offset < maxOffset) {\n      stopIndex++;\n      offset += getItemMetadata$1(props, stopIndex, instanceProps).size;\n    }\n\n    return stopIndex;\n  },\n  initInstanceProps: function initInstanceProps(props, instance) {\n    var _ref4 = props,\n        estimatedItemSize = _ref4.estimatedItemSize;\n    var instanceProps = {\n      itemMetadataMap: {},\n      estimatedItemSize: estimatedItemSize || DEFAULT_ESTIMATED_ITEM_SIZE$1,\n      lastMeasuredIndex: -1\n    };\n\n    instance.resetAfterIndex = function (index, shouldForceUpdate) {\n      if (shouldForceUpdate === void 0) {\n        shouldForceUpdate = true;\n      }\n\n      instanceProps.lastMeasuredIndex = Math.min(instanceProps.lastMeasuredIndex, index - 1); // We could potentially optimize further by only evicting styles after this index,\n      // But since styles are only cached while scrolling is in progress-\n      // It seems an unnecessary optimization.\n      // It's unlikely that resetAfterIndex() will be called while a user is scrolling.\n\n      instance._getItemStyleCache(-1);\n\n      if (shouldForceUpdate) {\n        instance.forceUpdate();\n      }\n    };\n\n    return instanceProps;\n  },\n  shouldResetStyleCacheOnItemSizeChange: false,\n  validateProps: function validateProps(_ref5) {\n    var itemSize = _ref5.itemSize;\n\n    if (process.env.NODE_ENV !== 'production') {\n      if (typeof itemSize !== 'function') {\n        throw Error('An invalid \"itemSize\" prop has been specified. ' + 'Value should be a function. ' + (\"\\\"\" + (itemSize === null ? 'null' : typeof itemSize) + \"\\\" was specified.\"));\n      }\n    }\n  }\n});\n\nvar FixedSizeGrid =\n/*#__PURE__*/\ncreateGridComponent({\n  getColumnOffset: function getColumnOffset(_ref, index) {\n    var columnWidth = _ref.columnWidth;\n    return index * columnWidth;\n  },\n  getColumnWidth: function getColumnWidth(_ref2, index) {\n    var columnWidth = _ref2.columnWidth;\n    return columnWidth;\n  },\n  getRowOffset: function getRowOffset(_ref3, index) {\n    var rowHeight = _ref3.rowHeight;\n    return index * rowHeight;\n  },\n  getRowHeight: function getRowHeight(_ref4, index) {\n    var rowHeight = _ref4.rowHeight;\n    return rowHeight;\n  },\n  getEstimatedTotalHeight: function getEstimatedTotalHeight(_ref5) {\n    var rowCount = _ref5.rowCount,\n        rowHeight = _ref5.rowHeight;\n    return rowHeight * rowCount;\n  },\n  getEstimatedTotalWidth: function getEstimatedTotalWidth(_ref6) {\n    var columnCount = _ref6.columnCount,\n        columnWidth = _ref6.columnWidth;\n    return columnWidth * columnCount;\n  },\n  getOffsetForColumnAndAlignment: function getOffsetForColumnAndAlignment(_ref7, columnIndex, align, scrollLeft, instanceProps, scrollbarSize) {\n    var columnCount = _ref7.columnCount,\n        columnWidth = _ref7.columnWidth,\n        width = _ref7.width;\n    var lastColumnOffset = Math.max(0, columnCount * columnWidth - width);\n    var maxOffset = Math.min(lastColumnOffset, columnIndex * columnWidth);\n    var minOffset = Math.max(0, columnIndex * columnWidth - width + scrollbarSize + columnWidth);\n\n    if (align === 'smart') {\n      if (scrollLeft >= minOffset - width && scrollLeft <= maxOffset + width) {\n        align = 'auto';\n      } else {\n        align = 'center';\n      }\n    }\n\n    switch (align) {\n      case 'start':\n        return maxOffset;\n\n      case 'end':\n        return minOffset;\n\n      case 'center':\n        // \"Centered\" offset is usually the average of the min and max.\n        // But near the edges of the list, this doesn't hold true.\n        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);\n\n        if (middleOffset < Math.ceil(width / 2)) {\n          return 0; // near the beginning\n        } else if (middleOffset > lastColumnOffset + Math.floor(width / 2)) {\n          return lastColumnOffset; // near the end\n        } else {\n          return middleOffset;\n        }\n\n      case 'auto':\n      default:\n        if (scrollLeft >= minOffset && scrollLeft <= maxOffset) {\n          return scrollLeft;\n        } else if (minOffset > maxOffset) {\n          // Because we only take into account the scrollbar size when calculating minOffset\n          // this value can be larger than maxOffset when at the end of the list\n          return minOffset;\n        } else if (scrollLeft < minOffset) {\n          return minOffset;\n        } else {\n          return maxOffset;\n        }\n\n    }\n  },\n  getOffsetForRowAndAlignment: function getOffsetForRowAndAlignment(_ref8, rowIndex, align, scrollTop, instanceProps, scrollbarSize) {\n    var rowHeight = _ref8.rowHeight,\n        height = _ref8.height,\n        rowCount = _ref8.rowCount;\n    var lastRowOffset = Math.max(0, rowCount * rowHeight - height);\n    var maxOffset = Math.min(lastRowOffset, rowIndex * rowHeight);\n    var minOffset = Math.max(0, rowIndex * rowHeight - height + scrollbarSize + rowHeight);\n\n    if (align === 'smart') {\n      if (scrollTop >= minOffset - height && scrollTop <= maxOffset + height) {\n        align = 'auto';\n      } else {\n        align = 'center';\n      }\n    }\n\n    switch (align) {\n      case 'start':\n        return maxOffset;\n\n      case 'end':\n        return minOffset;\n\n      case 'center':\n        // \"Centered\" offset is usually the average of the min and max.\n        // But near the edges of the list, this doesn't hold true.\n        var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);\n\n        if (middleOffset < Math.ceil(height / 2)) {\n          return 0; // near the beginning\n        } else if (middleOffset > lastRowOffset + Math.floor(height / 2)) {\n          return lastRowOffset; // near the end\n        } else {\n          return middleOffset;\n        }\n\n      case 'auto':\n      default:\n        if (scrollTop >= minOffset && scrollTop <= maxOffset) {\n          return scrollTop;\n        } else if (minOffset > maxOffset) {\n          // Because we only take into account the scrollbar size when calculating minOffset\n          // this value can be larger than maxOffset when at the end of the list\n          return minOffset;\n        } else if (scrollTop < minOffset) {\n          return minOffset;\n        } else {\n          return maxOffset;\n        }\n\n    }\n  },\n  getColumnStartIndexForOffset: function getColumnStartIndexForOffset(_ref9, scrollLeft) {\n    var columnWidth = _ref9.columnWidth,\n        columnCount = _ref9.columnCount;\n    return Math.max(0, Math.min(columnCount - 1, Math.floor(scrollLeft / columnWidth)));\n  },\n  getColumnStopIndexForStartIndex: function getColumnStopIndexForStartIndex(_ref10, startIndex, scrollLeft) {\n    var columnWidth = _ref10.columnWidth,\n        columnCount = _ref10.columnCount,\n        width = _ref10.width;\n    var left = startIndex * columnWidth;\n    var numVisibleColumns = Math.ceil((width + scrollLeft - left) / columnWidth);\n    return Math.max(0, Math.min(columnCount - 1, startIndex + numVisibleColumns - 1 // -1 is because stop index is inclusive\n    ));\n  },\n  getRowStartIndexForOffset: function getRowStartIndexForOffset(_ref11, scrollTop) {\n    var rowHeight = _ref11.rowHeight,\n        rowCount = _ref11.rowCount;\n    return Math.max(0, Math.min(rowCount - 1, Math.floor(scrollTop / rowHeight)));\n  },\n  getRowStopIndexForStartIndex: function getRowStopIndexForStartIndex(_ref12, startIndex, scrollTop) {\n    var rowHeight = _ref12.rowHeight,\n        rowCount = _ref12.rowCount,\n        height = _ref12.height;\n    var top = startIndex * rowHeight;\n    var numVisibleRows = Math.ceil((height + scrollTop - top) / rowHeight);\n    return Math.max(0, Math.min(rowCount - 1, startIndex + numVisibleRows - 1 // -1 is because stop index is inclusive\n    ));\n  },\n  initInstanceProps: function initInstanceProps(props) {// Noop\n  },\n  shouldResetStyleCacheOnItemSizeChange: true,\n  validateProps: function validateProps(_ref13) {\n    var columnWidth = _ref13.columnWidth,\n        rowHeight = _ref13.rowHeight;\n\n    if (process.env.NODE_ENV !== 'production') {\n      if (typeof columnWidth !== 'number') {\n        throw Error('An invalid \"columnWidth\" prop has been specified. ' + 'Value should be a number. ' + (\"\\\"\" + (columnWidth === null ? 'null' : typeof columnWidth) + \"\\\" was specified.\"));\n      }\n\n      if (typeof rowHeight !== 'number') {\n        throw Error('An invalid \"rowHeight\" prop has been specified. ' + 'Value should be a number. ' + (\"\\\"\" + (rowHeight === null ? 'null' : typeof rowHeight) + \"\\\" was specified.\"));\n      }\n    }\n  }\n});\n\nvar FixedSizeList =\n/*#__PURE__*/\ncreateListComponent({\n  getItemOffset: function getItemOffset(_ref, index) {\n    var itemSize = _ref.itemSize;\n    return index * itemSize;\n  },\n  getItemSize: function getItemSize(_ref2, index) {\n    var itemSize = _ref2.itemSize;\n    return itemSize;\n  },\n  getEstimatedTotalSize: function getEstimatedTotalSize(_ref3) {\n    var itemCount = _ref3.itemCount,\n        itemSize = _ref3.itemSize;\n    return itemSize * itemCount;\n  },\n  getOffsetForIndexAndAlignment: function getOffsetForIndexAndAlignment(_ref4, index, align, scrollOffset) {\n    var direction = _ref4.direction,\n        height = _ref4.height,\n        itemCount = _ref4.itemCount,\n        itemSize = _ref4.itemSize,\n        layout = _ref4.layout,\n        width = _ref4.width;\n    // TODO Deprecate direction \"horizontal\"\n    var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n    var size = isHorizontal ? width : height;\n    var lastItemOffset = Math.max(0, itemCount * itemSize - size);\n    var maxOffset = Math.min(lastItemOffset, index * itemSize);\n    var minOffset = Math.max(0, index * itemSize - size + itemSize);\n\n    if (align === 'smart') {\n      if (scrollOffset >= minOffset - size && scrollOffset <= maxOffset + size) {\n        align = 'auto';\n      } else {\n        align = 'center';\n      }\n    }\n\n    switch (align) {\n      case 'start':\n        return maxOffset;\n\n      case 'end':\n        return minOffset;\n\n      case 'center':\n        {\n          // \"Centered\" offset is usually the average of the min and max.\n          // But near the edges of the list, this doesn't hold true.\n          var middleOffset = Math.round(minOffset + (maxOffset - minOffset) / 2);\n\n          if (middleOffset < Math.ceil(size / 2)) {\n            return 0; // near the beginning\n          } else if (middleOffset > lastItemOffset + Math.floor(size / 2)) {\n            return lastItemOffset; // near the end\n          } else {\n            return middleOffset;\n          }\n        }\n\n      case 'auto':\n      default:\n        if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n          return scrollOffset;\n        } else if (scrollOffset < minOffset) {\n          return minOffset;\n        } else {\n          return maxOffset;\n        }\n\n    }\n  },\n  getStartIndexForOffset: function getStartIndexForOffset(_ref5, offset) {\n    var itemCount = _ref5.itemCount,\n        itemSize = _ref5.itemSize;\n    return Math.max(0, Math.min(itemCount - 1, Math.floor(offset / itemSize)));\n  },\n  getStopIndexForStartIndex: function getStopIndexForStartIndex(_ref6, startIndex, scrollOffset) {\n    var direction = _ref6.direction,\n        height = _ref6.height,\n        itemCount = _ref6.itemCount,\n        itemSize = _ref6.itemSize,\n        layout = _ref6.layout,\n        width = _ref6.width;\n    // TODO Deprecate direction \"horizontal\"\n    var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n    var offset = startIndex * itemSize;\n    var size = isHorizontal ? width : height;\n    var numVisibleItems = Math.ceil((size + scrollOffset - offset) / itemSize);\n    return Math.max(0, Math.min(itemCount - 1, startIndex + numVisibleItems - 1 // -1 is because stop index is inclusive\n    ));\n  },\n  initInstanceProps: function initInstanceProps(props) {// Noop\n  },\n  shouldResetStyleCacheOnItemSizeChange: true,\n  validateProps: function validateProps(_ref7) {\n    var itemSize = _ref7.itemSize;\n\n    if (process.env.NODE_ENV !== 'production') {\n      if (typeof itemSize !== 'number') {\n        throw Error('An invalid \"itemSize\" prop has been specified. ' + 'Value should be a number. ' + (\"\\\"\" + (itemSize === null ? 'null' : typeof itemSize) + \"\\\" was specified.\"));\n      }\n    }\n  }\n});\n\n// Pulled from react-compat\n// https://github.com/developit/preact-compat/blob/7c5de00e7c85e2ffd011bf3af02899b63f699d3a/src/index.js#L349\nfunction shallowDiffers(prev, next) {\n  for (var attribute in prev) {\n    if (!(attribute in next)) {\n      return true;\n    }\n  }\n\n  for (var _attribute in next) {\n    if (prev[_attribute] !== next[_attribute]) {\n      return true;\n    }\n  }\n\n  return false;\n}\n\n// It knows to compare individual style props and ignore the wrapper object.\n// See https://reactjs.org/docs/react-api.html#reactmemo\n\nfunction areEqual(prevProps, nextProps) {\n  var prevStyle = prevProps.style,\n      prevRest = _objectWithoutPropertiesLoose(prevProps, [\"style\"]);\n\n  var nextStyle = nextProps.style,\n      nextRest = _objectWithoutPropertiesLoose(nextProps, [\"style\"]);\n\n  return !shallowDiffers(prevStyle, nextStyle) && !shallowDiffers(prevRest, nextRest);\n}\n\n// It knows to compare individual style props and ignore the wrapper object.\n// See https://reactjs.org/docs/react-component.html#shouldcomponentupdate\n\nfunction shouldComponentUpdate(nextProps, nextState) {\n  return !areEqual(this.props, nextProps) || shallowDiffers(this.state, nextState);\n}\n\nexport { VariableSizeGrid, VariableSizeList, FixedSizeGrid, FixedSizeList, areEqual, shouldComponentUpdate };\n//# sourceMappingURL=index.esm.js.map\n"],"sourceRoot":""}