How to use mountMemo method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberHooks.js

Source:ReactFiberHooks.js Github

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...1145 mountHookTypesDev();1146 const prevDispatcher = ReactCurrentDispatcher.current;1147 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1148 try {1149 return mountMemo(create, deps);1150 } finally {1151 ReactCurrentDispatcher.current = prevDispatcher;1152 }1153 },1154 useReducer<S, I, A>(1155 reducer: (S, A) => S,1156 initialArg: I,1157 init?: I => S,1158 ): [S, Dispatch<A>] {1159 currentHookNameInDev = 'useReducer';1160 mountHookTypesDev();1161 const prevDispatcher = ReactCurrentDispatcher.current;1162 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1163 try {1164 return mountReducer(reducer, initialArg, init);1165 } finally {1166 ReactCurrentDispatcher.current = prevDispatcher;1167 }1168 },1169 useRef<T>(initialValue: T): {current: T} {1170 currentHookNameInDev = 'useRef';1171 mountHookTypesDev();1172 return mountRef(initialValue);1173 },1174 useState<S>(1175 initialState: (() => S) | S,1176 ): [S, Dispatch<BasicStateAction<S>>] {1177 currentHookNameInDev = 'useState';1178 mountHookTypesDev();1179 const prevDispatcher = ReactCurrentDispatcher.current;1180 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1181 try {1182 return mountState(initialState);1183 } finally {1184 ReactCurrentDispatcher.current = prevDispatcher;1185 }1186 },1187 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1188 currentHookNameInDev = 'useDebugValue';1189 mountHookTypesDev();1190 return mountDebugValue(value, formatterFn);1191 },1192 };1193 HooksDispatcherOnMountWithHookTypesInDEV = {1194 readContext<T>(1195 context: ReactContext<T>,1196 observedBits: void | number | boolean,1197 ): T {1198 return readContext(context, observedBits);1199 },1200 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1201 currentHookNameInDev = 'useCallback';1202 updateHookTypesDev();1203 return mountCallback(callback, deps);1204 },1205 useContext<T>(1206 context: ReactContext<T>,1207 observedBits: void | number | boolean,1208 ): T {1209 currentHookNameInDev = 'useContext';1210 updateHookTypesDev();1211 return readContext(context, observedBits);1212 },1213 useEffect(1214 create: () => (() => void) | void,1215 deps: Array<mixed> | void | null,1216 ): void {1217 currentHookNameInDev = 'useEffect';1218 updateHookTypesDev();1219 return mountEffect(create, deps);1220 },1221 useImperativeHandle<T>(1222 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1223 create: () => T,1224 deps: Array<mixed> | void | null,1225 ): void {1226 currentHookNameInDev = 'useImperativeHandle';1227 updateHookTypesDev();1228 return mountImperativeHandle(ref, create, deps);1229 },1230 useLayoutEffect(1231 create: () => (() => void) | void,1232 deps: Array<mixed> | void | null,1233 ): void {1234 currentHookNameInDev = 'useLayoutEffect';1235 updateHookTypesDev();1236 return mountLayoutEffect(create, deps);1237 },1238 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1239 currentHookNameInDev = 'useMemo';1240 updateHookTypesDev();1241 const prevDispatcher = ReactCurrentDispatcher.current;1242 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1243 try {1244 return mountMemo(create, deps);1245 } finally {1246 ReactCurrentDispatcher.current = prevDispatcher;1247 }1248 },1249 useReducer<S, I, A>(1250 reducer: (S, A) => S,1251 initialArg: I,1252 init?: I => S,1253 ): [S, Dispatch<A>] {1254 currentHookNameInDev = 'useReducer';1255 updateHookTypesDev();1256 const prevDispatcher = ReactCurrentDispatcher.current;1257 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1258 try {1259 return mountReducer(reducer, initialArg, init);1260 } finally {1261 ReactCurrentDispatcher.current = prevDispatcher;1262 }1263 },1264 useRef<T>(initialValue: T): {current: T} {1265 currentHookNameInDev = 'useRef';1266 updateHookTypesDev();1267 return mountRef(initialValue);1268 },1269 useState<S>(1270 initialState: (() => S) | S,1271 ): [S, Dispatch<BasicStateAction<S>>] {1272 currentHookNameInDev = 'useState';1273 updateHookTypesDev();1274 const prevDispatcher = ReactCurrentDispatcher.current;1275 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1276 try {1277 return mountState(initialState);1278 } finally {1279 ReactCurrentDispatcher.current = prevDispatcher;1280 }1281 },1282 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1283 currentHookNameInDev = 'useDebugValue';1284 updateHookTypesDev();1285 return mountDebugValue(value, formatterFn);1286 },1287 };1288 HooksDispatcherOnUpdateInDEV = {1289 readContext<T>(1290 context: ReactContext<T>,1291 observedBits: void | number | boolean,1292 ): T {1293 return readContext(context, observedBits);1294 },1295 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1296 currentHookNameInDev = 'useCallback';1297 updateHookTypesDev();1298 return updateCallback(callback, deps);1299 },1300 useContext<T>(1301 context: ReactContext<T>,1302 observedBits: void | number | boolean,1303 ): T {1304 currentHookNameInDev = 'useContext';1305 updateHookTypesDev();1306 return readContext(context, observedBits);1307 },1308 useEffect(1309 create: () => (() => void) | void,1310 deps: Array<mixed> | void | null,1311 ): void {1312 currentHookNameInDev = 'useEffect';1313 updateHookTypesDev();1314 return updateEffect(create, deps);1315 },1316 useImperativeHandle<T>(1317 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1318 create: () => T,1319 deps: Array<mixed> | void | null,1320 ): void {1321 currentHookNameInDev = 'useImperativeHandle';1322 updateHookTypesDev();1323 return updateImperativeHandle(ref, create, deps);1324 },1325 useLayoutEffect(1326 create: () => (() => void) | void,1327 deps: Array<mixed> | void | null,1328 ): void {1329 currentHookNameInDev = 'useLayoutEffect';1330 updateHookTypesDev();1331 return updateLayoutEffect(create, deps);1332 },1333 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1334 currentHookNameInDev = 'useMemo';1335 updateHookTypesDev();1336 const prevDispatcher = ReactCurrentDispatcher.current;1337 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1338 try {1339 return updateMemo(create, deps);1340 } finally {1341 ReactCurrentDispatcher.current = prevDispatcher;1342 }1343 },1344 useReducer<S, I, A>(1345 reducer: (S, A) => S,1346 initialArg: I,1347 init?: I => S,1348 ): [S, Dispatch<A>] {1349 currentHookNameInDev = 'useReducer';1350 updateHookTypesDev();1351 const prevDispatcher = ReactCurrentDispatcher.current;1352 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1353 try {1354 return updateReducer(reducer, initialArg, init);1355 } finally {1356 ReactCurrentDispatcher.current = prevDispatcher;1357 }1358 },1359 useRef<T>(initialValue: T): {current: T} {1360 currentHookNameInDev = 'useRef';1361 updateHookTypesDev();1362 return updateRef(initialValue);1363 },1364 useState<S>(1365 initialState: (() => S) | S,1366 ): [S, Dispatch<BasicStateAction<S>>] {1367 currentHookNameInDev = 'useState';1368 updateHookTypesDev();1369 const prevDispatcher = ReactCurrentDispatcher.current;1370 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1371 try {1372 return updateState(initialState);1373 } finally {1374 ReactCurrentDispatcher.current = prevDispatcher;1375 }1376 },1377 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1378 currentHookNameInDev = 'useDebugValue';1379 updateHookTypesDev();1380 return updateDebugValue(value, formatterFn);1381 },1382 };1383 InvalidNestedHooksDispatcherOnMountInDEV = {1384 readContext<T>(1385 context: ReactContext<T>,1386 observedBits: void | number | boolean,1387 ): T {1388 warnInvalidContextAccess();1389 return readContext(context, observedBits);1390 },1391 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1392 currentHookNameInDev = 'useCallback';1393 warnInvalidHookAccess();1394 mountHookTypesDev();1395 return mountCallback(callback, deps);1396 },1397 useContext<T>(1398 context: ReactContext<T>,1399 observedBits: void | number | boolean,1400 ): T {1401 currentHookNameInDev = 'useContext';1402 warnInvalidHookAccess();1403 mountHookTypesDev();1404 return readContext(context, observedBits);1405 },1406 useEffect(1407 create: () => (() => void) | void,1408 deps: Array<mixed> | void | null,1409 ): void {1410 currentHookNameInDev = 'useEffect';1411 warnInvalidHookAccess();1412 mountHookTypesDev();1413 return mountEffect(create, deps);1414 },1415 useImperativeHandle<T>(1416 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1417 create: () => T,1418 deps: Array<mixed> | void | null,1419 ): void {1420 currentHookNameInDev = 'useImperativeHandle';1421 warnInvalidHookAccess();1422 mountHookTypesDev();1423 return mountImperativeHandle(ref, create, deps);1424 },1425 useLayoutEffect(1426 create: () => (() => void) | void,1427 deps: Array<mixed> | void | null,1428 ): void {1429 currentHookNameInDev = 'useLayoutEffect';1430 warnInvalidHookAccess();1431 mountHookTypesDev();1432 return mountLayoutEffect(create, deps);1433 },1434 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1435 currentHookNameInDev = 'useMemo';1436 warnInvalidHookAccess();1437 mountHookTypesDev();1438 const prevDispatcher = ReactCurrentDispatcher.current;1439 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1440 try {1441 return mountMemo(create, deps);1442 } finally {1443 ReactCurrentDispatcher.current = prevDispatcher;1444 }1445 },1446 useReducer<S, I, A>(1447 reducer: (S, A) => S,1448 initialArg: I,1449 init?: I => S,1450 ): [S, Dispatch<A>] {1451 currentHookNameInDev = 'useReducer';1452 warnInvalidHookAccess();1453 mountHookTypesDev();1454 const prevDispatcher = ReactCurrentDispatcher.current;1455 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;...

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learn-react-hook.js

Source:learn-react-hook.js Github

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1// 以setState为例分析react-hook源码知识2// 这里useState其实是dispatcher对象里面的一个方法3export function useState < S > (initialState: (() => S) | S) {4 const dispatcher = resolveDispatcher();5 return dispatcher.useState(initialState);6}7// 继续跟踪dispatcher即resolveDispatcher()的返回值8function resolveDispatcher() {9 //主要还是使用的ReactCurrentDispatcher这个对象的值10 const dispatcher = ReactCurrentDispatcher.current;11 //...12 return dispatcher;13}14// 继续跟中ReactCurrentDispatcher15const ReactCurrentDispatcher = {16 /**17 * @internal18 * @type {ReactComponent}19 */20 // 追寻到其实最初使用的还是react自身提供的Dispatcher,最终指向的还是新版协调器中的FiberHooks21 // import type {Dispatcher} from 'react-reconciler/src/ReactFiberHooks';22 current: (null: null | Dispatcher),23};24// 继续跟进Dispatcher path: 'react-reconciler/src/ReactFiberHooks'25// 进入Dispatcher 发现Dispatcher的生命里面一大堆相关的hook,全部都在这里定义好了，找到useState的声明26export type Dispatcher = {27 readContext<T>(28 context: ReactContext<T>,29 observedBits: void | number | boolean,30 ): T,31 // useState定义的格式，一个进入的泛型S是函数或者一个值，同时返回一个S以及动作用于更新S32 useState<S>(initialState: (() => S) | S): [S, Dispatch<BasicStateAction<S>>],33 useReducer<S, I, A>(34 reducer: (S, A) => S,35 initialArg: I,36 init?: (I) => S,37 ): [S, Dispatch<A>],38 useContext<T>(39 context: ReactContext<T>,40 observedBits: void | number | boolean,41 ): T,42 useRef<T>(initialValue: T): {current: T},43 useEffect(44 create: () => (() => void) | void,45 deps: Array<mixed> | void | null,46 ): void,47 useLayoutEffect(48 create: () => (() => void) | void,49 deps: Array<mixed> | void | null,50 ): void,51 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T,52 useMemo<T>(nextCreate: () => T, deps: Array<mixed> | void | null): T,53 useImperativeHandle<T>(54 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,55 create: () => T,56 deps: Array<mixed> | void | null,57 ): void,58 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void,59};60// 跟进Dispatcher真正的逻辑实体,发现有各种各样的实体使用到了Dispatcher的定义在此选择hook挂载以及hook更新的状态实体去分析61//Hooks 挂载在组件时的情形, 全都是mount状态62const HooksDispatcherOnMount: Dispatcher = {63 readContext,64 useCallback: mountCallback,65 useContext: readContext,66 useEffect: mountEffect,67 useImperativeHandle: mountImperativeHandle,68 useLayoutEffect: mountLayoutEffect,69 useMemo: mountMemo,70 useReducer: mountReducer,71 useRef: mountRef,72 //useState在mount状态的时候对应的mountState进行跟踪73 useState: mountState,74 useDebugValue: mountDebugValue,75};76// mountState 相关的代码77function mountState<S>(78 initialState: (() => S) | S,79): [S, Dispatch<BasicStateAction<S>>] {80 // 定义一个hook的东西，这个hook不知道是个什么东西，好像是从workInProgress这个Fiber树里面拿出来的东西81 const hook = mountWorkInProgressHook();82 if (typeof initialState === 'function') {83 // 惰性初始化初始状态84 initialState = initialState();85 }86 // 当前hook记住的状态momoizedState = initialState即初始化state的值87 hook.memoizedState = hook.baseState = initialState;88 // 定义一个hook的队列89 const queue = (hook.queue = {90 last: null, // 不明白是什么东西91 dispatch: null, // 这个感觉有点像状态管理的动作触发器92 lastRenderedReducer: basicStateReducer, //不知道什么东西，根据命名，可以认为是上一次渲染的renducer93 lastRenderedState: (initialState: any), // 这个应该是上一次渲染的state啦94 });95 const dispatch: Dispatch<96 BasicStateAction<S>,97 > = (queue.dispatch = (dispatchAction.bind(98 null,99 // Flow doesn't know this is non-null, but we do.100 ((currentlyRenderingFiber: any): Fiber),101 queue,102 ): any)); // 这里hook.queue.dispatch其实就是react里面内置的一个dispatchAction的函数，具体里面估计是干嘛的不太清楚，稍候分析103 return [hook.memoizedState, dispatch];104}105/**106 * 这里分析以上的mountState分几步进行107 * 1、mountWorkInProgressHook这个函数里面返回的是什么东西？里面有什么东西？为什么命名为hook?108 * 2、dispatchAction函数109 * 3、此步可不用这么详细进行分析，basicStateReducer是什么，它有什么用，怎么用，以及currentlyRenderingFiber是个什么东西110 */111 // 1、mountWorkInProgressHook是个什么东西112 function mountWorkInProgressHook(): Hook {113 // 其实就是返回一个hook，就是一个简单的对象114 const hook: Hook = {115 memoizedState: null,116 baseState: null,117 queue: null,118 baseUpdate: null,119 next: null,120 };121 // 这里其实就是构建一个类似链表的东西？122 // HookA -> HookB -> HookC -> HookD ?123 // 感觉就是这个东西了最后把当前链表节点返回124 if (workInProgressHook === null) {125 // This is the first hook in the list126 // 这个firstWorkInprogressHook似乎是全局变量127 firstWorkInProgressHook = workInProgressHook = hook;128 } else {129 // Append to the end of the list130 workInProgressHook = workInProgressHook.next = hook;131 }132 return workInProgressHook;133}134// 2、明白了hook是个什么东西，现在第二步，dispatcherAction是个什么东西?135// 这个东西比较难啃看起来就挺复杂的，但是现在咱们先不去动它，因为咱们只是进行的一个挂载动作，没有任何动作行为，无法触发该函数执行136function dispatchAction<S, A>(137 fiber: Fiber, // currentlyRenderingFiber138 queue: UpdateQueue<S, A>, // mount阶段queue {last: null, lastRenderedReducer: basicStateReducer, lastRenderedState: (initialState: any)}139 action: A, // mount阶段 action 为undefined140) {141 invariant(142 numberOfReRenders < RE_RENDER_LIMIT,143 'Too many re-renders. React limits the number of renders to prevent ' +144 'an infinite loop.',145 );146 if (__DEV__) {147 warning(148 arguments.length <= 3,149 "State updates from the useState() and useReducer() Hooks don't support the " +150 'second callback argument. To execute a side effect after ' +151 'rendering, declare it in the component body with useEffect().',152 );153 }154 const alternate = fiber.alternate;155 if (156 fiber === currentlyRenderingFiber ||157 (alternate !== null && alternate === currentlyRenderingFiber)158 ) {159 // This is a render phase update. Stash it in a lazily-created map of160 // queue -> linked list of updates. After this render pass, we'll restart161 // and apply the stashed updates on top of the work-in-progress hook.162 didScheduleRenderPhaseUpdate = true;163 const update: Update<S, A> = {164 expirationTime: renderExpirationTime,165 action,166 eagerReducer: null,167 eagerState: null,168 next: null,169 };170 if (renderPhaseUpdates === null) {171 renderPhaseUpdates = new Map();172 }173 const firstRenderPhaseUpdate = renderPhaseUpdates.get(queue);174 if (firstRenderPhaseUpdate === undefined) {175 renderPhaseUpdates.set(queue, update);176 } else {177 // Append the update to the end of the list.178 let lastRenderPhaseUpdate = firstRenderPhaseUpdate;179 while (lastRenderPhaseUpdate.next !== null) {180 lastRenderPhaseUpdate = lastRenderPhaseUpdate.next;181 }182 lastRenderPhaseUpdate.next = update;183 }184 } else {185 flushPassiveEffects();186 const currentTime = requestCurrentTime();187 const expirationTime = computeExpirationForFiber(currentTime, fiber);188 const update: Update<S, A> = {189 expirationTime,190 action,191 eagerReducer: null,192 eagerState: null,193 next: null,194 };195 // Append the update to the end of the list.196 const last = queue.last;197 if (last === null) {198 // This is the first update. Create a circular list.199 update.next = update;200 } else {201 const first = last.next;202 if (first !== null) {203 // Still circular.204 update.next = first;205 }206 last.next = update;207 }208 queue.last = update;209 if (210 fiber.expirationTime === NoWork &&211 (alternate === null || alternate.expirationTime === NoWork)212 ) {213 // The queue is currently empty, which means we can eagerly compute the214 // next state before entering the render phase. If the new state is the215 // same as the current state, we may be able to bail out entirely.216 const lastRenderedReducer = queue.lastRenderedReducer;217 if (lastRenderedReducer !== null) {218 let prevDispatcher;219 if (__DEV__) {220 prevDispatcher = ReactCurrentDispatcher.current;221 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;222 }223 try {224 const currentState: S = (queue.lastRenderedState: any);225 const eagerState = lastRenderedReducer(currentState, action);226 // Stash the eagerly computed state, and the reducer used to compute227 // it, on the update object. If the reducer hasn't changed by the228 // time we enter the render phase, then the eager state can be used229 // without calling the reducer again.230 update.eagerReducer = lastRenderedReducer;231 update.eagerState = eagerState;232 if (is(eagerState, currentState)) {233 // Fast path. We can bail out without scheduling React to re-render.234 // It's still possible that we'll need to rebase this update later,235 // if the component re-renders for a different reason and by that236 // time the reducer has changed.237 return;238 }239 } catch (error) {240 // Suppress the error. It will throw again in the render phase.241 } finally {242 if (__DEV__) {243 ReactCurrentDispatcher.current = prevDispatcher;244 }245 }246 }247 }248 if (__DEV__) {249 // jest isn't a 'global', it's just exposed to tests via a wrapped function250 // further, this isn't a test file, so flow doesn't recognize the symbol. So...251 // $FlowExpectedError - because requirements don't give a damn about your type sigs.252 if ('undefined' !== typeof jest) {253 warnIfNotCurrentlyActingUpdatesInDev(fiber);254 }255 }256 scheduleWork(fiber, expirationTime);257 }258}259// 第三步，暂无260// 现在相当于初始化好了setState的hook就如同执行了一次下面的代码261const [name, setName] = useState('initialName');...

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index.js

Source:index.js Github

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...36 23 | var subscription = contextValue.subscription;37View compiled38mountMemo39node_modules/react-dom/cjs/react-dom.development.js:1584640 15843 | function mountMemo(nextCreate, deps) {41 15844 | var hook = mountWorkInProgressHook();42 15845 | var nextDeps = deps === undefined ? null : deps;43> 15846 | var nextValue = nextCreate();44 15847 | hook.memoizedState = [nextValue, nextDeps];45 15848 | return nextValue;46 15849 | }47View compiled48useMemo49node_modules/react-dom/cjs/react-dom.development.js:1621950 16216 | ReactCurrentDispatcher$1.current = InvalidNestedHooksDispatcherOnMountInDEV;51 16217 | 52 16218 | try {53> 16219 | return mountMemo(create, deps);54 | ^ 16220 | } finally {55 16221 | ReactCurrentDispatcher$1.current = prevDispatcher;56 16222 | }57View compiled58useMemo59node_modules/react/cjs/react.development.js:153260 1529 | }61 1530 | function useMemo(create, deps) {62 1531 | var dispatcher = resolveDispatcher();63> 1532 | return dispatcher.useMemo(create, deps);64 1533 | }65 1534 | function useImperativeHandle(ref, create, deps) {66 1535 | var dispatcher = resolveDispatcher();67View compiled...

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react-dom.js

Source:react-dom.js Github

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...54 return mountProvider(vdom);55 } else if (type && type.$$typeof === REACT_CONTEXT) {56 return mountContext(vdom);57 } else if (type && type.$$typeof === REACT_MEMO) {58 return mountMemo(vdom);59 } else {60 dom = document.createElement(type);// div span p61 }62 // 处理属性63 if (props) {64 updateProps(dom, {}, props); // 更新dom属性65 if (props.children) { // 有子集就挂载自己下面66 const children = props.children;67 if (typeof children === 'object' && children.type) { // 说明这是一个React元素68 children._mountIndex = 0; // diff中做下标用69 render(children, dom);70 } else if (Array.isArray(children)) { // 集合就循环挂载71 reconcileChildren(props.children, dom);72 }...

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handleComponent.js

Source:handleComponent.js Github

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...35 vdom.oldRenderVdom = renderVdom; // 记录原dom36 return createDOM(renderVdom); // 函数组件返回的就是vdom，再生成真实dom37}38// 处理memo函数组件39export function mountMemo(vdom) {40 // 正常渲染就好41 let {type, props} = vdom;42 let renderVdom = type.type(props);43 vdom.prevProps = props;44 vdom.oldRenderVdom = renderVdom;45 return createDOM(renderVdom);46}47/**48 * 渲染Provider组件49 * 1.真正要渲染的是它的儿子children50 * 2.把Provider组件自己收到的value属性赋值给context._currentValue51 */52// 提供者53export function mountProvider(vdom) {...

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useCallback&useMemo.js

Source:useCallback&useMemo.js Github

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...8 const nextDeps = deps === undefined ? null : deps;9 hook.memoizedState = [callback, nextDeps];10 return callback;11}12function mountMemo(nextCreate, deps) {13 // 和其他hook相同，首先找到正在执行的hook。14 const hook = mountWorkInProgressHook();15 const nextDeps = deps === undefined ? null : deps;16 // 把我们的依赖项保存在hook中并返回的callback，并执行。17 const nextValue = nextCreate();18 hook.memoizedState = [nextValue, nextDeps];19 return nextValue;20}21function updateCallback(callback, deps) {22 const hook = updateWorkInProgressHook();23 const nextDeps = deps === undefined ? null : deps;24 const prevState = hook.memoizedState;25 if (prevState !== null) {26 if (nextDeps !== null) {...

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use-component.js

Source:use-component.js Github

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1import { useMemo } from 'react';2/* eslint-disable no-continue */3export function useComponent() {4 // TODO: Detect DEBUG mode5 return useMemo(() => {6 try {7 throw new Error('fake error');8 } catch (ex) {9 const { stack } = ex;10 const stacks = stack.split('\n');11 for (let i = 0; i < stacks.length; i += 1) {12 if (i === 0) {13 // first line will be 'Error: fake error'14 continue;15 }16 // a typical stack line looks like this:17 // "at useComponent (webpack://1:2:3)"18 const stackSegs = stacks[i].trim().split(' ');19 // we only need the 2nd segment, which is the function name20 const funcName = stackSegs[1] || '';21 // we'll ignore anything that is a React hook22 if (!funcName23 || funcName === 'eval'24 || funcName === 'mountMemo'25 || funcName === 'Object.useMemo'26 || funcName.startsWith('use')) {27 continue;28 }29 // we'll return on the first non-hook function name, which is most likely30 // to be our calling component name;31 return funcName;32 }33 }34 return '__noname__';35 }, []);...

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 const url = await page.url();7 console.log(url);8 await page.close();9 await context.close();10 await browser.close();11})();

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Using AI Code Generation

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1const { chromium } = require("playwright");2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 await page.screenshot({ path: "google.png" });7 await page.close();8 await context.close();9 await browser.close();10})();11const { chromium } = require("playwright");12(async () => {13 const browser = await chromium.launch();14 const context = await browser.newContext();15 const page = await context.newPage();16 await page.screenshot({ path: "google.png" });17 await page.close();18 await context.close();19 await browser.close();20})();21const { chromium } = require("playwright");22(async () => {23 const browser = await chromium.launch();24 const context = await browser.newContext();25 const page = await context.newPage();26 await page.screenshot({ path: "google.png" });27 await page.close();28 await context.close();29 await browser.close();30})();31const { chromium } = require("playwright");32(async () => {33 const browser = await chromium.launch();34 const context = await browser.newContext();35 const page = await context.newPage();36 await page.screenshot({ path: "google.png" });37 await page.close();38 await context.close();39 await browser.close();40})();41const { chromium } = require("playwright");42(async () => {43 const browser = await chromium.launch();44 const context = await browser.newContext();45 const page = await context.newPage();46 await page.screenshot({ path: "google.png" });47 await page.close();48 await context.close();49 await browser.close();50})();51const {

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Using AI Code Generation

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1const { mountMemo } = require('playwright/lib/server/memo');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const memo = mountMemo(page);8 await page.screenshot({ path: 'example.png' });9 await browser.close();10})();11const { mountMemo } = require('playwright/lib/server/memo');12const { chromium } = require('playwright');13(async () => {14 const browser = await chromium.launch();15 const context = await browser.newContext();16 const page = await context.newPage();17 const memo = mountMemo(page);18 await page.screenshot({ path: 'example.png' });19 await browser.close();20})();21const { mountMemo } = require('playwright/lib/server/memo');22const { chromium } = require('playwright');23(async () => {24 const browser = await chromium.launch();25 const context = await browser.newContext();26 const page = await context.newPage();27 const memo = mountMemo(page);28 await page.screenshot({ path: 'example.png' });29 await browser.close();30})();31const { mountMemo } = require('playwright/lib/server/memo');32const { chromium } = require('playwright');33(async () => {34 const browser = await chromium.launch();35 const context = await browser.newContext();36 const page = await context.newPage();37 const memo = mountMemo(page);38 await page.screenshot({ path: 'example.png' });39 await browser.close();40})();41const { mountMemo } = require('playwright/lib/server/memo');42const { chromium } = require('playwright');43(async () => {44 const browser = await chromium.launch();45 const context = await browser.newContext();

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Using AI Code Generation

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1const { mountMemo } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3const browser = await chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6const memo = await mountMemo(page, 'test');7console.log(memo);8const { unmountMemo } = require('playwright/lib/server/browserContext');9const { chromium } = require('playwright');10const browser = await chromium.launch();11const context = await browser.newContext();12const page = await context.newPage();13const memo = await unmountMemo(page, 'test');14console.log(memo);15const { getMemo } = require('playwright/lib/server/browserContext');16const { chromium } = require('playwright');17const browser = await chromium.launch();18const context = await browser.newContext();19const page = await context.newPage();20const memo = await getMemo(page, 'test');21console.log(memo);22{ memo: 'test' }

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Using AI Code Generation

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1const { mountMemo } = require('playwright-core/lib/server/browserContext');2const { Page } = require('playwright-core/lib/server/page');3const { Frame } = require('playwright-core/lib/server/frames');4const { ElementHandle } = require('playwright-core/lib/server/dom');5const page = new Page(null, null, null, null, null, null, null, null);6const frame = new Frame(page, null, null, null, null, null, null, null, null, null, null, null, null);7const elementHandle = new ElementHandle(frame, null, null, null, null, null, null, null);8const memo = { a: 1, b: 2 };9mountMemo(elementHandle, memo);10console.log(elementHandle._memo);11console.log(frame._memo);12console.log(page._memo);13console.log(page._browserContext._memo);14console.log(page._browserContext._browser._memo);15console.log(page._browserContext._browser._server._memo);16console.log(page._browserContext._browser._server._playwright._memo);17console.log(page._browserContext._browser._server._playwright._playwrightCore._memo);18console.log(page._browserContext._browser._server._playwright._playwrightCore._playwright._memo);19console.log(page._browserContext._browser._server._playwright._playwrightCore._playwright._playwrightCore._memo);20console.log(page._browserContext._browser._server._playwright._playwrightCore._playwright._playwrightCore._playwright._memo);

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Using AI Code Generation

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1const { mountMemo } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const page2 = await memo.page();8 const context2 = await memo.context();9 const browser2 = await memo.browser();10 await browser.close();11})();

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Using AI Code Generation

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1const { mountMemo } = require('playwright/lib/server/frames');2mountMemo('my-memo', myMemo);3const { test } = require('@playwright/test');4test('My test', async ({ page }) => {5 await page.setContent('<my-memo></my-memo>');6});7class MyMemo extends HTMLElement {8 connectedCallback() {9 this.innerHTML = 'Hello World';10 }11}12customElements.define('my-memo', MyMemo);

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Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

  1. What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
  2. How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
  3. Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
  4. What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
  5. Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
  6. Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
  7. Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
  8. Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
  9. Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
  10. Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
  11. Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
  12. Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.

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