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React, { Component } from 'react';\n\n/*! *****************************************************************************\r\nCopyright (c) Microsoft Corporation. All rights reserved.\r\nLicensed under the Apache License, Version 2.0 (the \"License\"); you may not use\r\nthis file except in compliance with the License. You may obtain a copy of the\r\nLicense at http://www.apache.org/licenses/LICENSE-2.0\r\n\r\nTHIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\r\nKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED\r\nWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,\r\nMERCHANTABLITY OR NON-INFRINGEMENT.\r\n\r\nSee the Apache Version 2.0 License for specific language governing permissions\r\nand limitations under the License.\r\n***************************************************************************** */\r\n/* global Reflect, Promise */\r\n\r\nvar extendStatics = function(d, b) {\r\n extendStatics = Object.setPrototypeOf ||\r\n ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||\r\n function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };\r\n return extendStatics(d, b);\r\n};\r\n\r\nfunction __extends(d, b) {\r\n extendStatics(d, b);\r\n function __() { this.constructor = d; }\r\n d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());\r\n}\r\n\r\nvar __assign = function() {\r\n __assign = Object.assign || function __assign(t) {\r\n for (var s, i = 1, n = arguments.length; i < n; i++) {\r\n s = arguments[i];\r\n for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];\r\n }\r\n return t;\r\n };\r\n return __assign.apply(this, arguments);\r\n};\n\n/* eslint-disable no-undefined,no-param-reassign,no-shadow */\n\n/**\n * Throttle execution of a function. Especially useful for rate limiting\n * execution of handlers on events like resize and scroll.\n *\n * @param {Number} delay A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.\n * @param {Boolean} [noTrailing] Optional, defaults to false. If noTrailing is true, callback will only execute every `delay` milliseconds while the\n * throttled-function is being called. If noTrailing is false or unspecified, callback will be executed one final time\n * after the last throttled-function call. (After the throttled-function has not been called for `delay` milliseconds,\n * the internal counter is reset)\n * @param {Function} callback A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is,\n * to `callback` when the throttled-function is executed.\n * @param {Boolean} [debounceMode] If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is false (at end),\n * schedule `callback` to execute after `delay` ms.\n *\n * @return {Function} A new, throttled, function.\n */\nfunction throttle (delay, noTrailing, callback, debounceMode) {\n /*\n * After wrapper has stopped being called, this timeout ensures that\n * `callback` is executed at the proper times in `throttle` and `end`\n * debounce modes.\n */\n var timeoutID;\n var cancelled = false; // Keep track of the last time `callback` was executed.\n\n var lastExec = 0; // Function to clear existing timeout\n\n function clearExistingTimeout() {\n if (timeoutID) {\n clearTimeout(timeoutID);\n }\n } // Function to cancel next exec\n\n\n function cancel() {\n clearExistingTimeout();\n cancelled = true;\n } // `noTrailing` defaults to falsy.\n\n\n if (typeof noTrailing !== 'boolean') {\n debounceMode = callback;\n callback = noTrailing;\n noTrailing = undefined;\n }\n /*\n * The `wrapper` function encapsulates all of the throttling / debouncing\n * functionality and when executed will limit the rate at which `callback`\n * is executed.\n */\n\n\n function wrapper() {\n var self = this;\n var elapsed = Date.now() - lastExec;\n var args = arguments;\n\n if (cancelled) {\n return;\n } // Execute `callback` and update the `lastExec` timestamp.\n\n\n function exec() {\n lastExec = Date.now();\n callback.apply(self, args);\n }\n /*\n * If `debounceMode` is true (at begin) this is used to clear the flag\n * to allow future `callback` executions.\n */\n\n\n function clear() {\n timeoutID = undefined;\n }\n\n if (debounceMode && !timeoutID) {\n /*\n * Since `wrapper` is being called for the first time and\n * `debounceMode` is true (at begin), execute `callback`.\n */\n exec();\n }\n\n clearExistingTimeout();\n\n if (debounceMode === undefined && elapsed > delay) {\n /*\n * In throttle mode, if `delay` time has been exceeded, execute\n * `callback`.\n */\n exec();\n } else if (noTrailing !== true) {\n /*\n * In trailing throttle mode, since `delay` time has not been\n * exceeded, schedule `callback` to execute `delay` ms after most\n * recent execution.\n *\n * If `debounceMode` is true (at begin), schedule `clear` to execute\n * after `delay` ms.\n *\n * If `debounceMode` is false (at end), schedule `callback` to\n * execute after `delay` ms.\n */\n timeoutID = setTimeout(debounceMode ? clear : exec, debounceMode === undefined ? delay - elapsed : delay);\n }\n }\n\n wrapper.cancel = cancel; // Return the wrapper function.\n\n return wrapper;\n}\n\nvar ThresholdUnits = {\r\n Pixel: 'Pixel',\r\n Percent: 'Percent',\r\n};\r\nvar defaultThreshold = {\r\n unit: ThresholdUnits.Percent,\r\n value: 0.8,\r\n};\r\nfunction parseThreshold(scrollThreshold) {\r\n if (typeof scrollThreshold === 'number') {\r\n return {\r\n unit: ThresholdUnits.Percent,\r\n value: scrollThreshold * 100,\r\n };\r\n }\r\n if (typeof scrollThreshold === 'string') {\r\n if (scrollThreshold.match(/^(\\d*(\\.\\d+)?)px$/)) {\r\n return {\r\n unit: ThresholdUnits.Pixel,\r\n value: parseFloat(scrollThreshold),\r\n };\r\n }\r\n if (scrollThreshold.match(/^(\\d*(\\.\\d+)?)%$/)) {\r\n return {\r\n unit: ThresholdUnits.Percent,\r\n value: parseFloat(scrollThreshold),\r\n };\r\n }\r\n console.warn('scrollThreshold format is invalid. Valid formats: \"120px\", \"50%\"...');\r\n return defaultThreshold;\r\n }\r\n console.warn('scrollThreshold should be string or number');\r\n return defaultThreshold;\r\n}\n\nvar InfiniteScroll = /** @class */ (function (_super) {\r\n __extends(InfiniteScroll, _super);\r\n function InfiniteScroll(props) {\r\n var _this = _super.call(this, props) || this;\r\n _this.lastScrollTop = 0;\r\n _this.actionTriggered = false;\r\n // variables to keep track of pull down behaviour\r\n _this.startY = 0;\r\n _this.currentY = 0;\r\n _this.dragging = false;\r\n // will be populated in componentDidMount\r\n // based on the height of the pull down element\r\n _this.maxPullDownDistance = 0;\r\n _this.getScrollableTarget = function () {\r\n if (_this.props.scrollableTarget instanceof HTMLElement)\r\n return _this.props.scrollableTarget;\r\n if (typeof _this.props.scrollableTarget === 'string') {\r\n return document.getElementById(_this.props.scrollableTarget);\r\n }\r\n if (_this.props.scrollableTarget === null) {\r\n console.warn(\"You are trying to pass scrollableTarget but it is null. This might\\n happen because the element may not have been added to DOM yet.\\n See https://github.com/ankeetmaini/react-infinite-scroll-component/issues/59 for more info.\\n \");\r\n }\r\n return null;\r\n };\r\n _this.onStart = function (evt) {\r\n if (_this.lastScrollTop)\r\n return;\r\n _this.dragging = true;\r\n if (evt instanceof MouseEvent) {\r\n _this.startY = evt.pageY;\r\n }\r\n else if (evt instanceof TouchEvent) {\r\n _this.startY = evt.touches[0].pageY;\r\n }\r\n _this.currentY = _this.startY;\r\n if (_this._infScroll) {\r\n _this._infScroll.style.willChange = 'transform';\r\n _this._infScroll.style.transition = \"transform 0.2s cubic-bezier(0,0,0.31,1)\";\r\n }\r\n };\r\n _this.onMove = function (evt) {\r\n if (!_this.dragging)\r\n return;\r\n if (evt instanceof MouseEvent) {\r\n _this.currentY = evt.pageY;\r\n }\r\n else if (evt instanceof TouchEvent) {\r\n _this.currentY = evt.touches[0].pageY;\r\n }\r\n // user is scrolling down to up\r\n if (_this.currentY < _this.startY)\r\n return;\r\n if (_this.currentY - _this.startY >=\r\n Number(_this.props.pullDownToRefreshThreshold)) {\r\n _this.setState({\r\n pullToRefreshThresholdBreached: true,\r\n });\r\n }\r\n // so you can drag upto 1.5 times of the maxPullDownDistance\r\n if (_this.currentY - _this.startY > _this.maxPullDownDistance * 1.5)\r\n return;\r\n if (_this._infScroll) {\r\n _this._infScroll.style.overflow = 'visible';\r\n _this._infScroll.style.transform = \"translate3d(0px, \" + (_this.currentY -\r\n _this.startY) + \"px, 0px)\";\r\n }\r\n };\r\n _this.onEnd = function () {\r\n _this.startY = 0;\r\n _this.currentY = 0;\r\n _this.dragging = false;\r\n if (_this.state.pullToRefreshThresholdBreached) {\r\n _this.props.refreshFunction && _this.props.refreshFunction();\r\n _this.setState({\r\n pullToRefreshThresholdBreached: false,\r\n });\r\n }\r\n requestAnimationFrame(function () {\r\n // this._infScroll\r\n if (_this._infScroll) {\r\n _this._infScroll.style.overflow = 'auto';\r\n _this._infScroll.style.transform = 'none';\r\n _this._infScroll.style.willChange = 'none';\r\n }\r\n });\r\n };\r\n _this.onScrollListener = function (event) {\r\n if (typeof _this.props.onScroll === 'function') {\r\n // Execute this callback in next tick so that it does not affect the\r\n // functionality of the library.\r\n setTimeout(function () { return _this.props.onScroll && _this.props.onScroll(event); }, 0);\r\n }\r\n var target = _this.props.height || _this._scrollableNode\r\n ? event.target\r\n : document.documentElement.scrollTop\r\n ? document.documentElement\r\n : document.body;\r\n // return immediately if the action has already been triggered,\r\n // prevents multiple triggers.\r\n if (_this.actionTriggered)\r\n return;\r\n var atBottom = _this.props.inverse\r\n ? _this.isElementAtTop(target, _this.props.scrollThreshold)\r\n : _this.isElementAtBottom(target, _this.props.scrollThreshold);\r\n // call the `next` function in the props to trigger the next data fetch\r\n if (atBottom && _this.props.hasMore) {\r\n _this.actionTriggered = true;\r\n _this.setState({ showLoader: true });\r\n _this.props.next && _this.props.next();\r\n }\r\n _this.lastScrollTop = target.scrollTop;\r\n };\r\n _this.state = {\r\n showLoader: false,\r\n pullToRefreshThresholdBreached: false,\r\n };\r\n _this.throttledOnScrollListener = throttle(150, _this.onScrollListener).bind(_this);\r\n _this.onStart = _this.onStart.bind(_this);\r\n _this.onMove = _this.onMove.bind(_this);\r\n _this.onEnd = _this.onEnd.bind(_this);\r\n return _this;\r\n }\r\n InfiniteScroll.prototype.componentDidMount = function () {\r\n if (typeof this.props.dataLength === 'undefined') {\r\n throw new Error(\"mandatory prop \\\"dataLength\\\" is missing. The prop is needed\" +\r\n \" when loading more content. Check README.md for usage\");\r\n }\r\n this._scrollableNode = this.getScrollableTarget();\r\n this.el = this.props.height\r\n ? this._infScroll\r\n : this._scrollableNode || window;\r\n if (this.el) {\r\n this.el.addEventListener('scroll', this\r\n .throttledOnScrollListener);\r\n }\r\n if (typeof this.props.initialScrollY === 'number' &&\r\n this.el &&\r\n this.el instanceof HTMLElement &&\r\n this.el.scrollHeight > this.props.initialScrollY) {\r\n this.el.scrollTo(0, this.props.initialScrollY);\r\n }\r\n if (this.props.pullDownToRefresh && this.el) {\r\n this.el.addEventListener('touchstart', this.onStart);\r\n this.el.addEventListener('touchmove', this.onMove);\r\n this.el.addEventListener('touchend', this.onEnd);\r\n this.el.addEventListener('mousedown', this.onStart);\r\n this.el.addEventListener('mousemove', this.onMove);\r\n this.el.addEventListener('mouseup', this.onEnd);\r\n // get BCR of pullDown element to position it above\r\n this.maxPullDownDistance =\r\n (this._pullDown &&\r\n this._pullDown.firstChild &&\r\n this._pullDown.firstChild.getBoundingClientRect()\r\n .height) ||\r\n 0;\r\n this.forceUpdate();\r\n if (typeof this.props.refreshFunction !== 'function') {\r\n throw new Error(\"Mandatory prop \\\"refreshFunction\\\" missing.\\n Pull Down To Refresh functionality will not work\\n as expected. Check README.md for usage'\");\r\n }\r\n }\r\n };\r\n InfiniteScroll.prototype.componentWillUnmount = function () {\r\n if (this.el) {\r\n this.el.removeEventListener('scroll', this\r\n .throttledOnScrollListener);\r\n if (this.props.pullDownToRefresh) {\r\n this.el.removeEventListener('touchstart', this.onStart);\r\n this.el.removeEventListener('touchmove', this.onMove);\r\n this.el.removeEventListener('touchend', this.onEnd);\r\n this.el.removeEventListener('mousedown', this.onStart);\r\n this.el.removeEventListener('mousemove', this.onMove);\r\n this.el.removeEventListener('mouseup', this.onEnd);\r\n }\r\n }\r\n };\r\n InfiniteScroll.prototype.UNSAFE_componentWillReceiveProps = function (props) {\r\n // do nothing when dataLength is unchanged\r\n if (this.props.dataLength === props.dataLength)\r\n return;\r\n this.actionTriggered = false;\r\n // update state when new data was sent in\r\n this.setState({\r\n showLoader: false,\r\n });\r\n };\r\n InfiniteScroll.prototype.isElementAtTop = function (target, scrollThreshold) {\r\n if (scrollThreshold === void 0) { scrollThreshold = 0.8; }\r\n var clientHeight = target === document.body || target === document.documentElement\r\n ? window.screen.availHeight\r\n : target.clientHeight;\r\n var threshold = parseThreshold(scrollThreshold);\r\n if (threshold.unit === ThresholdUnits.Pixel) {\r\n return (target.scrollTop <=\r\n threshold.value + clientHeight - target.scrollHeight + 1 ||\r\n target.scrollTop === 0);\r\n }\r\n return (target.scrollTop <=\r\n threshold.value / 100 + clientHeight - target.scrollHeight + 1 ||\r\n target.scrollTop === 0);\r\n };\r\n InfiniteScroll.prototype.isElementAtBottom = function (target, scrollThreshold) {\r\n if (scrollThreshold === void 0) { scrollThreshold = 0.8; }\r\n var clientHeight = target === document.body || target === document.documentElement\r\n ? window.screen.availHeight\r\n : target.clientHeight;\r\n var threshold = parseThreshold(scrollThreshold);\r\n if (threshold.unit === ThresholdUnits.Pixel) {\r\n return (target.scrollTop + clientHeight >= target.scrollHeight - threshold.value);\r\n }\r\n return (target.scrollTop + clientHeight >=\r\n (threshold.value / 100) * target.scrollHeight);\r\n };\r\n InfiniteScroll.prototype.render = function () {\r\n var _this = this;\r\n var style = __assign({ height: this.props.height || 'auto', overflow: 'auto', WebkitOverflowScrolling: 'touch' }, this.props.style);\r\n var hasChildren = this.props.hasChildren ||\r\n !!(this.props.children &&\r\n this.props.children instanceof Array &&\r\n this.props.children.length);\r\n // because heighted infiniteScroll visualy breaks\r\n // on drag down as overflow becomes visible\r\n var outerDivStyle = this.props.pullDownToRefresh && this.props.height\r\n ? { overflow: 'auto' }\r\n : {};\r\n return (React.createElement(\"div\", { style: outerDivStyle, className: \"infinite-scroll-component__outerdiv\" },\r\n React.createElement(\"div\", { className: \"infinite-scroll-component \" + (this.props.className || ''), ref: function (infScroll) { return (_this._infScroll = infScroll); }, style: style },\r\n this.props.pullDownToRefresh && (React.createElement(\"div\", { style: { position: 'relative' }, ref: function (pullDown) { return (_this._pullDown = pullDown); } },\r\n React.createElement(\"div\", { style: {\r\n position: 'absolute',\r\n left: 0,\r\n right: 0,\r\n top: -1 * this.maxPullDownDistance,\r\n } }, this.state.pullToRefreshThresholdBreached\r\n ? this.props.releaseToRefreshContent\r\n : this.props.pullDownToRefreshContent))),\r\n this.props.children,\r\n !this.state.showLoader &&\r\n !hasChildren &&\r\n this.props.hasMore &&\r\n this.props.loader,\r\n this.state.showLoader && this.props.hasMore && this.props.loader,\r\n !this.props.hasMore && this.props.endMessage)));\r\n };\r\n return InfiniteScroll;\r\n}(Component));\n\nexport default InfiniteScroll;\n//# sourceMappingURL=index.es.js.map\n","module.exports=function(e){var t={};function r(n){if(t[n])return t[n].exports;var o=t[n]={i:n,l:!1,exports:{}};return e[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}return r.m=e,r.c=t,r.d=function(e,t,n){r.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:n})},r.r=function(e){\"undefined\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\"Module\"}),Object.defineProperty(e,\"__esModule\",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&\"object\"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,\"default\",{enumerable:!0,value:e}),2&t&&\"string\"!=typeof e)for(var o in e)r.d(n,o,function(t){return e[t]}.bind(null,o));return n},r.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return r.d(t,\"a\",t),t},r.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},r.p=\"\",r(r.s=0)}([function(e,t,r){\"use strict\";Object.defineProperty(t,\"__esModule\",{value:!0});var n=r(1);Object.defineProperty(t,\"default\",{enumerable:!0,get:function(){return(e=n,e&&e.__esModule?e:{default:e}).default;var e}})},function(e,t,r){\"use strict\";Object.defineProperty(t,\"__esModule\",{value:!0});var n=a(r(2)),o=a(r(3)),u=r(6);function a(e){return e&&e.__esModule?e:{default:e}}var l=function(e){var t=e.className,r=e.style,o=function(e,t){var r={};for(var n in e)t.indexOf(n)>=0||Object.prototype.hasOwnProperty.call(e,n)&&(r[n]=e[n]);return r}(e,[\"className\",\"style\"]);return n.default.createElement(\"span\",{className:t,style:r},(0,u.pluralize)(o))};l.propTypes={singular:o.default.string.isRequired,plural:o.default.string,count:o.default.number,showCount:o.default.bool,className:o.default.string,style:o.default.object,zero:o.default.string},l.defaultProps={count:1,showCount:!0,className:null,style:{},zero:null},t.default=l},function(e,t){e.exports=require(\"react\")},function(e,t,r){e.exports=r(4)()},function(e,t,r){\"use strict\";var n=r(5);function o(){}function u(){}u.resetWarningCache=o,e.exports=function(){function e(e,t,r,o,u,a){if(a!==n){var l=new Error(\"Calling PropTypes validators directly is not supported by the `prop-types` package. 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Read more at http://fb.me/use-check-prop-types\");throw l.name=\"Invariant Violation\",l}}function t(){return e}e.isRequired=e;var r={array:e,bool:e,func:e,number:e,object:e,string:e,symbol:e,any:e,arrayOf:t,element:e,elementType:e,instanceOf:t,node:e,objectOf:t,oneOf:t,oneOfType:t,shape:t,exact:t,checkPropTypes:u,resetWarningCache:o};return r.PropTypes=r,r}},function(e,t,r){\"use strict\";e.exports=\"SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED\"},function(e,t,r){\"use strict\";Object.defineProperty(t,\"__esModule\",{value:!0}),t.pluralize=void 0;var n=r(7);t.pluralize=n.pluralize},function(e,t,r){\"use strict\";Object.defineProperty(t,\"__esModule\",{value:!0});t.pluralize=function(e){var t=e.singular,r=e.plural,n=e.count,o=e.showCount,u=e.zero;if(0===n&&u)return u;var a=t;return 1!==n&&(a=r||t+\"s\"),o?n+\" \"+a:a}}]);","import { Component, createElement } from 'react';\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 * 5) Use 'export' statement over 'module.exports' assignment\n **/\n\n// Check `document` and `window` in case of server-side rendering\nlet windowObject;\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}\nlet cancelFrame = null;\nlet requestFrame = null;\nconst TIMEOUT_DURATION = 20;\nconst clearTimeoutFn = windowObject.clearTimeout;\nconst setTimeoutFn = windowObject.setTimeout;\nconst cancelAnimationFrameFn = windowObject.cancelAnimationFrame || windowObject.mozCancelAnimationFrame || windowObject.webkitCancelAnimationFrame;\nconst requestAnimationFrameFn = windowObject.requestAnimationFrame || windowObject.mozRequestAnimationFrame || windowObject.webkitRequestAnimationFrame;\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([animationFrameID, timeoutID]) {\n cancelAnimationFrameFn(animationFrameID);\n clearTimeoutFn(timeoutID);\n };\n requestFrame = function requestAnimationFrameWithSetTimeoutFallback(callback) {\n const animationFrameID = requestAnimationFrameFn(function animationFrameCallback() {\n clearTimeoutFn(timeoutID);\n callback();\n });\n const timeoutID = setTimeoutFn(function timeoutCallback() {\n cancelAnimationFrameFn(animationFrameID);\n callback();\n }, TIMEOUT_DURATION);\n return [animationFrameID, timeoutID];\n };\n}\nfunction createDetectElementResize(nonce) {\n let animationKeyframes;\n let animationName;\n let animationStartEvent;\n let animationStyle;\n let checkTriggers;\n let resetTriggers;\n let scrollListener;\n const attachEvent = typeof document !== \"undefined\" && document.attachEvent;\n if (!attachEvent) {\n resetTriggers = function (element) {\n const 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 checkTriggers = function (element) {\n return element.offsetWidth !== element.__resizeLast__.width || element.offsetHeight !== element.__resizeLast__.height;\n };\n scrollListener = function (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 const 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 let animation = false;\n let keyframeprefix = \"\";\n animationStartEvent = \"animationstart\";\n const domPrefixes = \"Webkit Moz O ms\".split(\" \");\n let startEvents = \"webkitAnimationStart animationstart oAnimationStart MSAnimationStart\".split(\" \");\n let pfx = \"\";\n {\n const elm = document.createElement(\"fakeelement\");\n if (elm.style.animationName !== undefined) {\n animation = true;\n }\n if (animation === false) {\n for (let 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 animationName = \"resizeanim\";\n animationKeyframes = \"@\" + keyframeprefix + \"keyframes \" + animationName + \" { from { opacity: 0; } to { opacity: 0; } } \";\n animationStyle = keyframeprefix + \"animation: 1ms \" + animationName + \"; \";\n }\n const createStyles = function (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 const 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 style.id = \"detectElementResize\";\n style.type = \"text/css\";\n if (nonce != null) {\n style.setAttribute(\"nonce\", nonce);\n }\n if (style.styleSheet) {\n style.styleSheet.cssText = css;\n } else {\n style.appendChild(doc.createTextNode(css));\n }\n head.appendChild(style);\n }\n };\n const addResizeListener = function (element, fn) {\n if (attachEvent) {\n element.attachEvent(\"onresize\", fn);\n } else {\n if (!element.__resizeTriggers__) {\n const doc = element.ownerDocument;\n const 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 const expandTrigger = doc.createElement(\"div\");\n expandTrigger.className = \"expand-trigger\";\n expandTrigger.appendChild(doc.createElement(\"div\"));\n const 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 const removeResizeListener = function (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 return {\n addResizeListener,\n removeResizeListener\n };\n}\n\nclass AutoSizer extends Component {\n constructor(...args) {\n super(...args);\n this.state = {\n height: this.props.defaultHeight || 0,\n scaledHeight: this.props.defaultHeight || 0,\n scaledWidth: this.props.defaultWidth || 0,\n width: this.props.defaultWidth || 0\n };\n this._autoSizer = null;\n this._detectElementResize = null;\n this._parentNode = null;\n this._resizeObserver = null;\n this._timeoutId = null;\n this._onResize = () => {\n this._timeoutId = null;\n const {\n disableHeight,\n disableWidth,\n onResize\n } = this.props;\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 const style = window.getComputedStyle(this._parentNode) || {};\n const paddingLeft = parseFloat(style.paddingLeft || \"0\");\n const paddingRight = parseFloat(style.paddingRight || \"0\");\n const paddingTop = parseFloat(style.paddingTop || \"0\");\n const paddingBottom = parseFloat(style.paddingBottom || \"0\");\n const rect = this._parentNode.getBoundingClientRect();\n const scaledHeight = rect.height - paddingTop - paddingBottom;\n const scaledWidth = rect.width - paddingLeft - paddingRight;\n const height = this._parentNode.offsetHeight - paddingTop - paddingBottom;\n const width = this._parentNode.offsetWidth - paddingLeft - paddingRight;\n if (!disableHeight && (this.state.height !== height || this.state.scaledHeight !== scaledHeight) || !disableWidth && (this.state.width !== width || this.state.scaledWidth !== scaledWidth)) {\n this.setState({\n height,\n width,\n scaledHeight,\n scaledWidth\n });\n if (typeof onResize === \"function\") {\n onResize({\n height,\n scaledHeight,\n scaledWidth,\n width\n });\n }\n }\n }\n };\n this._setRef = autoSizer => {\n this._autoSizer = autoSizer;\n };\n }\n componentDidMount() {\n const {\n nonce\n } = this.props;\n const parentNode = this._autoSizer ? this._autoSizer.parentNode : null;\n if (parentNode != null && parentNode.ownerDocument && parentNode.ownerDocument.defaultView && parentNode instanceof 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 = parentNode;\n\n // Use ResizeObserver from the same context where parentNode (which we will observe) was defined\n // Using just global can result into onResize events not being emitted in cases with multiple realms\n const ResizeObserverInstance = parentNode.ownerDocument.defaultView.ResizeObserver;\n if (ResizeObserverInstance != null) {\n this._resizeObserver = new ResizeObserverInstance(() => {\n // Guard against \"ResizeObserver loop limit exceeded\" error;\n // could be triggered if the state update causes the ResizeObserver handler to run long.\n // See https://github.com/bvaughn/react-virtualized-auto-sizer/issues/55\n this._timeoutId = setTimeout(this._onResize, 0);\n });\n this._resizeObserver.observe(parentNode);\n } else {\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(parentNode, this._onResize);\n }\n this._onResize();\n }\n }\n componentWillUnmount() {\n if (this._parentNode) {\n if (this._detectElementResize) {\n this._detectElementResize.removeResizeListener(this._parentNode, this._onResize);\n }\n if (this._timeoutId !== null) {\n clearTimeout(this._timeoutId);\n }\n if (this._resizeObserver) {\n this._resizeObserver.disconnect();\n }\n }\n }\n render() {\n const {\n children,\n defaultHeight,\n defaultWidth,\n disableHeight = false,\n disableWidth = false,\n doNotBailOutOnEmptyChildren = false,\n nonce,\n onResize,\n style = {},\n tagName = \"div\",\n ...rest\n } = this.props;\n const {\n height,\n scaledHeight,\n scaledWidth,\n width\n } = this.state;\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 const outerStyle = {\n overflow: \"visible\"\n };\n const childParams = {};\n\n // Avoid rendering children before the initial measurements have been collected.\n // At best this would just be wasting cycles.\n let bailoutOnChildren = false;\n if (!disableHeight) {\n if (height === 0) {\n bailoutOnChildren = true;\n }\n outerStyle.height = 0;\n childParams.height = height;\n childParams.scaledHeight = scaledHeight;\n }\n if (!disableWidth) {\n if (width === 0) {\n bailoutOnChildren = true;\n }\n outerStyle.width = 0;\n childParams.width = width;\n childParams.scaledWidth = scaledWidth;\n }\n if (doNotBailOutOnEmptyChildren) {\n bailoutOnChildren = false;\n }\n return createElement(tagName, {\n ref: this._setRef,\n style: {\n ...outerStyle,\n ...style\n },\n ...rest\n }, !bailoutOnChildren && children(childParams));\n }\n}\n\nfunction isHeightAndWidthProps(props) {\n return props && props.disableHeight !== true && props.disableWidth !== true;\n}\nfunction isHeightOnlyProps(props) {\n return props && props.disableHeight !== true && props.disableWidth === true;\n}\nfunction isWidthOnlyProps(props) {\n return props && props.disableHeight === true && props.disableWidth !== true;\n}\n\nexport { AutoSizer as default, isHeightAndWidthProps, isHeightOnlyProps, isWidthOnlyProps };\n","import { PureComponent } from 'react';\n\nfunction isInteger(value) {\n return typeof value === 'number' && isFinite(value) && Math.floor(value) === value;\n}\n\nfunction isRangeVisible(_ref) {\n var lastRenderedStartIndex = _ref.lastRenderedStartIndex,\n lastRenderedStopIndex = _ref.lastRenderedStopIndex,\n startIndex = _ref.startIndex,\n stopIndex = _ref.stopIndex;\n\n return !(startIndex > lastRenderedStopIndex || stopIndex < lastRenderedStartIndex);\n}\n\nfunction scanForUnloadedRanges(_ref) {\n var isItemLoaded = _ref.isItemLoaded,\n itemCount = _ref.itemCount,\n minimumBatchSize = _ref.minimumBatchSize,\n startIndex = _ref.startIndex,\n stopIndex = _ref.stopIndex;\n\n var unloadedRanges = [];\n\n var rangeStartIndex = null;\n var rangeStopIndex = null;\n\n for (var _index = startIndex; _index <= stopIndex; _index++) {\n var loaded = isItemLoaded(_index);\n\n if (!loaded) {\n rangeStopIndex = _index;\n if (rangeStartIndex === null) {\n rangeStartIndex = _index;\n }\n } else if (rangeStopIndex !== null) {\n unloadedRanges.push(rangeStartIndex, rangeStopIndex);\n\n rangeStartIndex = rangeStopIndex = null;\n }\n }\n\n // If :rangeStopIndex is not null it means we haven't ran out of unloaded rows.\n // Scan forward to try filling our :minimumBatchSize.\n if (rangeStopIndex !== null) {\n var potentialStopIndex = Math.min(Math.max(rangeStopIndex, rangeStartIndex + minimumBatchSize - 1), itemCount - 1);\n\n for (var _index2 = rangeStopIndex + 1; _index2 <= potentialStopIndex; _index2++) {\n if (!isItemLoaded(_index2)) {\n rangeStopIndex = _index2;\n } else {\n break;\n }\n }\n\n unloadedRanges.push(rangeStartIndex, rangeStopIndex);\n }\n\n // Check to see if our first range ended prematurely.\n // In this case we should scan backwards to try filling our :minimumBatchSize.\n if (unloadedRanges.length) {\n while (unloadedRanges[1] - unloadedRanges[0] + 1 < minimumBatchSize && unloadedRanges[0] > 0) {\n var _index3 = unloadedRanges[0] - 1;\n\n if (!isItemLoaded(_index3)) {\n unloadedRanges[0] = _index3;\n } else {\n break;\n }\n }\n }\n\n return unloadedRanges;\n}\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 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 InfiniteLoader = function (_PureComponent) {\n inherits(InfiniteLoader, _PureComponent);\n\n function InfiniteLoader() {\n var _ref;\n\n var _temp, _this, _ret;\n\n classCallCheck(this, InfiniteLoader);\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 = InfiniteLoader.__proto__ || Object.getPrototypeOf(InfiniteLoader)).call.apply(_ref, [this].concat(args))), _this), _this._lastRenderedStartIndex = -1, _this._lastRenderedStopIndex = -1, _this._memoizedUnloadedRanges = [], _this._onItemsRendered = function (_ref2) {\n var visibleStartIndex = _ref2.visibleStartIndex,\n visibleStopIndex = _ref2.visibleStopIndex;\n\n if (process.env.NODE_ENV !== 'production') {\n if (!isInteger(visibleStartIndex) || !isInteger(visibleStopIndex)) {\n console.warn('Invalid onItemsRendered signature; please refer to InfiniteLoader documentation.');\n }\n\n if (typeof _this.props.loadMoreRows === 'function') {\n console.warn('InfiniteLoader \"loadMoreRows\" prop has been renamed to \"loadMoreItems\".');\n }\n }\n\n _this._lastRenderedStartIndex = visibleStartIndex;\n _this._lastRenderedStopIndex = visibleStopIndex;\n\n _this._ensureRowsLoaded(visibleStartIndex, visibleStopIndex);\n }, _this._setRef = function (listRef) {\n _this._listRef = listRef;\n }, _temp), possibleConstructorReturn(_this, _ret);\n }\n\n createClass(InfiniteLoader, [{\n key: 'resetloadMoreItemsCache',\n value: function resetloadMoreItemsCache() {\n var autoReload = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;\n\n this._memoizedUnloadedRanges = [];\n\n if (autoReload) {\n this._ensureRowsLoaded(this._lastRenderedStartIndex, this._lastRenderedStopIndex);\n }\n }\n }, {\n key: 'componentDidMount',\n value: function componentDidMount() {\n if (process.env.NODE_ENV !== 'production') {\n if (this._listRef == null) {\n console.warn('Invalid list ref; please refer to InfiniteLoader documentation.');\n }\n }\n }\n }, {\n key: 'render',\n value: function render() {\n var children = this.props.children;\n\n\n return children({\n onItemsRendered: this._onItemsRendered,\n ref: this._setRef\n });\n }\n }, {\n key: '_ensureRowsLoaded',\n value: function _ensureRowsLoaded(startIndex, stopIndex) {\n var _props = this.props,\n isItemLoaded = _props.isItemLoaded,\n itemCount = _props.itemCount,\n _props$minimumBatchSi = _props.minimumBatchSize,\n minimumBatchSize = _props$minimumBatchSi === undefined ? 10 : _props$minimumBatchSi,\n _props$threshold = _props.threshold,\n threshold = _props$threshold === undefined ? 15 : _props$threshold;\n\n\n var unloadedRanges = scanForUnloadedRanges({\n isItemLoaded: isItemLoaded,\n itemCount: itemCount,\n minimumBatchSize: minimumBatchSize,\n startIndex: Math.max(0, startIndex - threshold),\n stopIndex: Math.min(itemCount - 1, stopIndex + threshold)\n });\n\n // Avoid calling load-rows unless range has changed.\n // This shouldn't be strictly necessary, but is maybe nice to do.\n if (this._memoizedUnloadedRanges.length !== unloadedRanges.length || this._memoizedUnloadedRanges.some(function (startOrStop, index) {\n return unloadedRanges[index] !== startOrStop;\n })) {\n this._memoizedUnloadedRanges = unloadedRanges;\n this._loadUnloadedRanges(unloadedRanges);\n }\n }\n }, {\n key: '_loadUnloadedRanges',\n value: function _loadUnloadedRanges(unloadedRanges) {\n var _this2 = this;\n\n // loadMoreRows was renamed to loadMoreItems in v1.0.3; will be removed in v2.0\n var loadMoreItems = this.props.loadMoreItems || this.props.loadMoreRows;\n\n var _loop = function _loop(i) {\n var startIndex = unloadedRanges[i];\n var stopIndex = unloadedRanges[i + 1];\n var promise = loadMoreItems(startIndex, stopIndex);\n if (promise != null) {\n promise.then(function () {\n // Refresh the visible rows if any of them have just been loaded.\n // Otherwise they will remain in their unloaded visual state.\n if (isRangeVisible({\n lastRenderedStartIndex: _this2._lastRenderedStartIndex,\n lastRenderedStopIndex: _this2._lastRenderedStopIndex,\n startIndex: startIndex,\n stopIndex: stopIndex\n })) {\n // Handle an unmount while promises are still in flight.\n if (_this2._listRef == null) {\n return;\n }\n\n // Resize cached row sizes for VariableSizeList,\n // otherwise just re-render the list.\n if (typeof _this2._listRef.resetAfterIndex === 'function') {\n _this2._listRef.resetAfterIndex(startIndex, true);\n } else {\n // HACK reset temporarily cached item styles to force PureComponent to re-render.\n // This is pretty gross, but I'm okay with it for now.\n // Don't judge me.\n if (typeof _this2._listRef._getItemStyleCache === 'function') {\n _this2._listRef._getItemStyleCache(-1);\n }\n _this2._listRef.forceUpdate();\n }\n }\n });\n }\n };\n\n for (var i = 0; i < unloadedRanges.length; i += 2) {\n _loop(i);\n }\n }\n }]);\n return InfiniteLoader;\n}(PureComponent);\n\nexport default InfiniteLoader;\n","import setPrototypeOf from \"./setPrototypeOf.js\";\nfunction _inheritsLoose(t, o) {\n t.prototype = Object.create(o.prototype), t.prototype.constructor = t, setPrototypeOf(t, o);\n}\nexport { _inheritsLoose as default };","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 _assertThisInitialized from '@babel/runtime/helpers/esm/assertThisInitialized';\nimport _inheritsLoose from '@babel/runtime/helpers/esm/inheritsLoose';\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 = /*#__PURE__*/new WeakSet();\n devWarningsOverscanRowsColumnsCount = /*#__PURE__*/new WeakSet();\n devWarningsTagName = /*#__PURE__*/new WeakSet();\n }\n}\n\nfunction createGridComponent(_ref2) {\n var _class;\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 _class = /*#__PURE__*/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(_this));\n _this._resetIsScrollingTimeoutId = null;\n _this._outerRef = void 0;\n _this.state = {\n instance: _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 }, _class;\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 = /*#__PURE__*/createGridComponent({\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 = /*#__PURE__*/new WeakSet();\n devWarningsTagName$1 = /*#__PURE__*/new WeakSet();\n }\n}\n\nfunction createListComponent(_ref) {\n var _class;\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 _class = /*#__PURE__*/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(_this));\n _this._outerRef = void 0;\n _this._resetIsScrollingTimeoutId = null;\n _this.state = {\n instance: _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$currentTarget.scrollWidth;\n\n _this.setState(function (prevState) {\n if (prevState.scrollOffset === scrollLeft) {\n // Scroll position may have been updated by cDM/cDU,\n // In which case we don't need to trigger another render,\n // And we don't want to update state.isScrolling.\n return null;\n }\n\n var direction = _this.props.direction;\n var scrollOffset = scrollLeft;\n\n if (direction === 'rtl') {\n // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n switch (getRTLOffsetType()) {\n case 'negative':\n scrollOffset = -scrollLeft;\n break;\n\n case 'positive-descending':\n scrollOffset = scrollWidth - clientWidth - scrollLeft;\n break;\n }\n } // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n\n\n scrollOffset = Math.max(0, Math.min(scrollOffset, scrollWidth - clientWidth));\n return {\n isScrolling: true,\n scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n scrollOffset: scrollOffset,\n scrollUpdateWasRequested: false\n };\n }, _this._resetIsScrollingDebounced);\n };\n\n _this._onScrollVertical = function (event) {\n var _event$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$1(nextProps, prevState);\n validateProps(nextProps);\n return null;\n };\n\n var _proto = List.prototype;\n\n _proto.scrollTo = function scrollTo(scrollOffset) {\n scrollOffset = Math.max(0, scrollOffset);\n this.setState(function (prevState) {\n if (prevState.scrollOffset === scrollOffset) {\n return null;\n }\n\n return {\n scrollDirection: prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n scrollOffset: scrollOffset,\n scrollUpdateWasRequested: true\n };\n }, this._resetIsScrollingDebounced);\n };\n\n _proto.scrollToItem = function scrollToItem(index, align) {\n if (align === void 0) {\n align = 'auto';\n }\n\n var _this$props2 = this.props,\n itemCount = _this$props2.itemCount,\n layout = _this$props2.layout;\n var scrollOffset = this.state.scrollOffset;\n index = Math.max(0, Math.min(index, itemCount - 1)); // The scrollbar size should be considered when scrolling an item into view, to ensure it's fully visible.\n // But we only need to account for its size when it's actually visible.\n // This is an edge case for lists; normally they only scroll in the dominant direction.\n\n var scrollbarSize = 0;\n\n if (this._outerRef) {\n var outerRef = this._outerRef;\n\n if (layout === 'vertical') {\n scrollbarSize = outerRef.scrollWidth > outerRef.clientWidth ? getScrollbarSize() : 0;\n } else {\n scrollbarSize = outerRef.scrollHeight > outerRef.clientHeight ? getScrollbarSize() : 0;\n }\n }\n\n this.scrollTo(getOffsetForIndexAndAlignment(this.props, index, align, scrollOffset, this._instanceProps, scrollbarSize));\n };\n\n _proto.componentDidMount = function componentDidMount() {\n var _this$props3 = this.props,\n direction = _this$props3.direction,\n initialScrollOffset = _this$props3.initialScrollOffset,\n layout = _this$props3.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$props4 = this.props,\n direction = _this$props4.direction,\n layout = _this$props4.layout;\n var _this$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$props5 = this.props,\n children = _this$props5.children,\n className = _this$props5.className,\n direction = _this$props5.direction,\n height = _this$props5.height,\n innerRef = _this$props5.innerRef,\n innerElementType = _this$props5.innerElementType,\n innerTagName = _this$props5.innerTagName,\n itemCount = _this$props5.itemCount,\n itemData = _this$props5.itemData,\n _this$props5$itemKey = _this$props5.itemKey,\n itemKey = _this$props5$itemKey === void 0 ? defaultItemKey$1 : _this$props5$itemKey,\n layout = _this$props5.layout,\n outerElementType = _this$props5.outerElementType,\n outerTagName = _this$props5.outerTagName,\n style = _this$props5.style,\n useIsScrolling = _this$props5.useIsScrolling,\n width = _this$props5.width;\n var isScrolling = this.state.isScrolling; // TODO Deprecate direction \"horizontal\"\n\n var isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n var onScroll = isHorizontal ? this._onScrollHorizontal : this._onScrollVertical;\n\n var _this$_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$state2.scrollUpdateWasRequested;\n\n this._callOnScroll(_scrollDirection, _scrollOffset, _scrollUpdateWasRequested);\n }\n } // Lazily create and cache item styles while scrolling,\n // So that pure component sCU will prevent re-renders.\n // We maintain this cache, and pass a style prop rather than index,\n // So that List can clear cached styles and force item re-render if necessary.\n ;\n\n _proto._getRangeToRender = function _getRangeToRender() {\n var _this$props6 = this.props,\n itemCount = _this$props6.itemCount,\n overscanCount = _this$props6.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 }, _class;\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 = /*#__PURE__*/createListComponent({\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, scrollbarSize) {\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 + scrollbarSize);\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 = /*#__PURE__*/createGridComponent({\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 = /*#__PURE__*/createListComponent({\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, instanceProps, scrollbarSize) {\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 + scrollbarSize);\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\nvar _excluded = [\"style\"],\n _excluded2 = [\"style\"];\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, _excluded);\n\n var nextStyle = nextProps.style,\n nextRest = _objectWithoutPropertiesLoose(nextProps, _excluded2);\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 { FixedSizeGrid, FixedSizeList, VariableSizeGrid, VariableSizeList, areEqual, shouldComponentUpdate };\n//# sourceMappingURL=index.esm.js.map\n","function _assertThisInitialized(e) {\n if (void 0 === e) throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n return e;\n}\nexport { _assertThisInitialized as default };","function _extends() {\n return _extends = Object.assign ? Object.assign.bind() : function (n) {\n for (var e = 1; e < arguments.length; e++) {\n var t = arguments[e];\n for (var r in t) ({}).hasOwnProperty.call(t, r) && (n[r] = t[r]);\n }\n return n;\n }, _extends.apply(null, arguments);\n}\nexport { _extends as default };","function _setPrototypeOf(t, e) {\n return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) {\n return t.__proto__ = e, t;\n }, _setPrototypeOf(t, e);\n}\nexport { _setPrototypeOf as default };"],"names":[],"sourceRoot":""}