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How to use resetContextDependencies method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberScheduler.js

Source:ReactFiberScheduler.js

...699        const currentTime = requestCurrentTime();700        if (currentTime < expirationTime) {701          // Restart at the current time.702          workPhase = prevWorkPhase;703          resetContextDependencies();704          ReactCurrentDispatcher.current = prevDispatcher;705          if (enableSchedulerTracing) {706            __interactionsRef.current = ((prevInteractions: any): Set<707              Interaction,708            >);709          }710          return renderRoot.bind(null, root, currentTime);711        }712      }713    } else {714      // Since we know we're in a React event, we can clear the current715      // event time. The next update will compute a new event time.716      currentEventTime = NoWork;717    }718    do {719      try {720        if (isSync) {721          workLoopSync();722        } else {723          workLoop();724        }725        break;726      } catch (thrownValue) {727        // Reset module-level state that was set during the render phase.728        resetContextDependencies();729        resetHooks();730        const sourceFiber = workInProgress;731        if (sourceFiber === null || sourceFiber.return === null) {732          // Expected to be working on a non-root fiber. This is a fatal error733          // because there's no ancestor that can handle it; the root is734          // supposed to capture all errors that weren't caught by an error735          // boundary.736          prepareFreshStack(root, expirationTime);737          workPhase = prevWorkPhase;738          throw thrownValue;739        }740        if (enableProfilerTimer && sourceFiber.mode & ProfileMode) {741          // Record the time spent rendering before an error was thrown. This742          // avoids inaccurate Profiler durations in the case of a743          // suspended render.744          stopProfilerTimerIfRunningAndRecordDelta(sourceFiber, true);745        }746        const returnFiber = sourceFiber.return;747        throwException(748          root,749          returnFiber,750          sourceFiber,751          thrownValue,752          renderExpirationTime,753        );754        workInProgress = completeUnitOfWork(sourceFiber);755      }756    } while (true);757    workPhase = prevWorkPhase;758    resetContextDependencies();759    ReactCurrentDispatcher.current = prevDispatcher;760    if (enableSchedulerTracing) {761      __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);762    }763    if (workInProgress !== null) {764      // There's still work left over. Return a continuation.765      stopInterruptedWorkLoopTimer();766      if (expirationTime !== Sync) {767        startRequestCallbackTimer();768      }769      return renderRoot.bind(null, root, expirationTime);770    }771  }772  // We now have a consistent tree. The next step is either to commit it, or, if773  // something suspended, wait to commit it after a timeout.774  stopFinishedWorkLoopTimer();775  const isLocked = resolveLocksOnRoot(root, expirationTime);776  if (isLocked) {777    // This root has a lock that prevents it from committing. Exit. If we begin778    // work on the root again, without any intervening updates, it will finish779    // without doing additional work.780    return null;781  }782  // Set this to null to indicate there's no in-progress render.783  workInProgressRoot = null;784  switch (workInProgressRootExitStatus) {785    case RootIncomplete: {786      invariant(false, 'Should have a work-in-progress.');787    }788    // Flow knows about invariant, so it compains if I add a break statement,789    // but eslint doesn't know about invariant, so it complains if I do.790    // eslint-disable-next-line no-fallthrough791    case RootErrored: {792      // An error was thrown. First check if there is lower priority work793      // scheduled on this root.794      const lastPendingTime = root.lastPendingTime;795      if (root.lastPendingTime < expirationTime) {796        // There's lower priority work. Before raising the error, try rendering797        // at the lower priority to see if it fixes it. Use a continuation to798        // maintain the existing priority and position in the queue.799        return renderRoot.bind(null, root, lastPendingTime);800      }801      if (!isSync) {802        // If we're rendering asynchronously, it's possible the error was803        // caused by tearing due to a mutation during an event. Try rendering804        // one more time without yiedling to events.805        prepareFreshStack(root, expirationTime);806        scheduleCallback(807          ImmediatePriority,808          renderRoot.bind(null, root, expirationTime),809        );810        return null;811      }812      // If we're already rendering synchronously, commit the root in its813      // errored state.814      return commitRoot.bind(null, root, expirationTime);815    }816    case RootSuspended: {817      if (!isSync) {818        const lastPendingTime = root.lastPendingTime;819        if (root.lastPendingTime < expirationTime) {820          // There's lower priority work. It might be unsuspended. Try rendering821          // at that level.822          return renderRoot.bind(null, root, lastPendingTime);823        }824        // If workInProgressRootMostRecentEventTime is Sync, that means we didn't825        // track any event times. That can happen if we retried but nothing switched826        // from fallback to content. There's no reason to delay doing no work.827        if (workInProgressRootMostRecentEventTime !== Sync) {828          let msUntilTimeout = computeMsUntilTimeout(829            workInProgressRootMostRecentEventTime,830            expirationTime,831          );832          // Don't bother with a very short suspense time.833          if (msUntilTimeout > 10) {834            // The render is suspended, it hasn't timed out, and there's no lower835            // priority work to do. Instead of committing the fallback836            // immediately, wait for more data to arrive.837            root.timeoutHandle = scheduleTimeout(838              commitRoot.bind(null, root, expirationTime),839              msUntilTimeout,840            );841            return null;842          }843        }844      }845      // The work expired. Commit immediately.846      return commitRoot.bind(null, root, expirationTime);847    }848    case RootCompleted: {849      // The work completed. Ready to commit.850      return commitRoot.bind(null, root, expirationTime);851    }852    default: {853      invariant(false, 'Unknown root exit status.');854    }855  }856}857export function markRenderEventTime(expirationTime: ExpirationTime): void {858  if (expirationTime < workInProgressRootMostRecentEventTime) {859    workInProgressRootMostRecentEventTime = expirationTime;860  }861}862export function renderDidSuspend(): void {863  if (workInProgressRootExitStatus === RootIncomplete) {864    workInProgressRootExitStatus = RootSuspended;865  }866}867export function renderDidError() {868  if (869    workInProgressRootExitStatus === RootIncomplete ||870    workInProgressRootExitStatus === RootSuspended871  ) {872    workInProgressRootExitStatus = RootErrored;873  }874}875function inferTimeFromExpirationTime(expirationTime: ExpirationTime): number {876  // We don't know exactly when the update was scheduled, but we can infer an877  // approximate start time from the expiration time.878  const earliestExpirationTimeMs = expirationTimeToMs(expirationTime);879  return earliestExpirationTimeMs - LOW_PRIORITY_EXPIRATION;880}881function workLoopSync() {882  // Already timed out, so perform work without checking if we need to yield.883  while (workInProgress !== null) {884    workInProgress = performUnitOfWork(workInProgress);885  }886}887function workLoop() {888  // Perform work until Scheduler asks us to yield889  while (workInProgress !== null && !shouldYield()) {890    workInProgress = performUnitOfWork(workInProgress);891  }892}893function performUnitOfWork(unitOfWork: Fiber): Fiber | null {894  // The current, flushed, state of this fiber is the alternate. Ideally895  // nothing should rely on this, but relying on it here means that we don't896  // need an additional field on the work in progress.897  const current = unitOfWork.alternate;898  startWorkTimer(unitOfWork);899  setCurrentDebugFiberInDEV(unitOfWork);900  let next;901  if (enableProfilerTimer && (unitOfWork.mode & ProfileMode) !== NoContext) {902    startProfilerTimer(unitOfWork);903    next = beginWork(current, unitOfWork, renderExpirationTime);904    stopProfilerTimerIfRunningAndRecordDelta(unitOfWork, true);905  } else {906    next = beginWork(current, unitOfWork, renderExpirationTime);907  }908  resetCurrentDebugFiberInDEV();909  unitOfWork.memoizedProps = unitOfWork.pendingProps;910  if (next === null) {911    // If this doesn't spawn new work, complete the current work.912    next = completeUnitOfWork(unitOfWork);913  }914  ReactCurrentOwner.current = null;915  return next;916}917function completeUnitOfWork(unitOfWork: Fiber): Fiber | null {918  // Attempt to complete the current unit of work, then move to the next919  // sibling. If there are no more siblings, return to the parent fiber.920  workInProgress = unitOfWork;921  do {922    // The current, flushed, state of this fiber is the alternate. Ideally923    // nothing should rely on this, but relying on it here means that we don't924    // need an additional field on the work in progress.925    const current = workInProgress.alternate;926    const returnFiber = workInProgress.return;927    // Check if the work completed or if something threw.928    if ((workInProgress.effectTag & Incomplete) === NoEffect) {929      setCurrentDebugFiberInDEV(workInProgress);930      let next;931      if (932        !enableProfilerTimer ||933        (workInProgress.mode & ProfileMode) === NoContext934      ) {935        next = completeWork(current, workInProgress, renderExpirationTime);936      } else {937        startProfilerTimer(workInProgress);938        next = completeWork(current, workInProgress, renderExpirationTime);939        // Update render duration assuming we didn't error.940        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);941      }942      stopWorkTimer(workInProgress);943      resetCurrentDebugFiberInDEV();944      resetChildExpirationTime(workInProgress);945      if (next !== null) {946        // Completing this fiber spawned new work. Work on that next.947        return next;948      }949      if (950        returnFiber !== null &&951        // Do not append effects to parents if a sibling failed to complete952        (returnFiber.effectTag & Incomplete) === NoEffect953      ) {954        // Append all the effects of the subtree and this fiber onto the effect955        // list of the parent. The completion order of the children affects the956        // side-effect order.957        if (returnFiber.firstEffect === null) {958          returnFiber.firstEffect = workInProgress.firstEffect;959        }960        if (workInProgress.lastEffect !== null) {961          if (returnFiber.lastEffect !== null) {962            returnFiber.lastEffect.nextEffect = workInProgress.firstEffect;963          }964          returnFiber.lastEffect = workInProgress.lastEffect;965        }966        // If this fiber had side-effects, we append it AFTER the children's967        // side-effects. We can perform certain side-effects earlier if needed,968        // by doing multiple passes over the effect list. We don't want to969        // schedule our own side-effect on our own list because if end up970        // reusing children we'll schedule this effect onto itself since we're971        // at the end.972        const effectTag = workInProgress.effectTag;973        // Skip both NoWork and PerformedWork tags when creating the effect974        // list. PerformedWork effect is read by React DevTools but shouldn't be975        // committed.976        if (effectTag > PerformedWork) {977          if (returnFiber.lastEffect !== null) {978            returnFiber.lastEffect.nextEffect = workInProgress;979          } else {980            returnFiber.firstEffect = workInProgress;981          }982          returnFiber.lastEffect = workInProgress;983        }984      }985    } else {986      // This fiber did not complete because something threw. Pop values off987      // the stack without entering the complete phase. If this is a boundary,988      // capture values if possible.989      const next = unwindWork(workInProgress, renderExpirationTime);990      // Because this fiber did not complete, don't reset its expiration time.991      if (992        enableProfilerTimer &&993        (workInProgress.mode & ProfileMode) !== NoContext994      ) {995        // Record the render duration for the fiber that errored.996        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);997        // Include the time spent working on failed children before continuing.998        let actualDuration = workInProgress.actualDuration;999        let child = workInProgress.child;1000        while (child !== null) {1001          actualDuration += child.actualDuration;1002          child = child.sibling;1003        }1004        workInProgress.actualDuration = actualDuration;1005      }1006      if (next !== null) {1007        // If completing this work spawned new work, do that next. We'll come1008        // back here again.1009        // Since we're restarting, remove anything that is not a host effect1010        // from the effect tag.1011        // TODO: The name stopFailedWorkTimer is misleading because Suspense1012        // also captures and restarts.1013        stopFailedWorkTimer(workInProgress);1014        next.effectTag &= HostEffectMask;1015        return next;1016      }1017      stopWorkTimer(workInProgress);1018      if (returnFiber !== null) {1019        // Mark the parent fiber as incomplete and clear its effect list.1020        returnFiber.firstEffect = returnFiber.lastEffect = null;1021        returnFiber.effectTag |= Incomplete;1022      }1023    }1024    const siblingFiber = workInProgress.sibling;1025    if (siblingFiber !== null) {1026      // If there is more work to do in this returnFiber, do that next.1027      return siblingFiber;1028    }1029    // Otherwise, return to the parent1030    workInProgress = returnFiber;1031  } while (workInProgress !== null);1032  // We've reached the root.1033  if (workInProgressRootExitStatus === RootIncomplete) {1034    workInProgressRootExitStatus = RootCompleted;1035  }1036  return null;1037}1038function resetChildExpirationTime(completedWork: Fiber) {1039  if (1040    renderExpirationTime !== Never &&1041    completedWork.childExpirationTime === Never1042  ) {1043    // The children of this component are hidden. Don't bubble their1044    // expiration times.1045    return;1046  }1047  let newChildExpirationTime = NoWork;1048  // Bubble up the earliest expiration time.1049  if (enableProfilerTimer && (completedWork.mode & ProfileMode) !== NoContext) {1050    // In profiling mode, resetChildExpirationTime is also used to reset1051    // profiler durations.1052    let actualDuration = completedWork.actualDuration;1053    let treeBaseDuration = completedWork.selfBaseDuration;1054    // When a fiber is cloned, its actualDuration is reset to 0. This value will1055    // only be updated if work is done on the fiber (i.e. it doesn't bailout).1056    // When work is done, it should bubble to the parent's actualDuration. If1057    // the fiber has not been cloned though, (meaning no work was done), then1058    // this value will reflect the amount of time spent working on a previous1059    // render. In that case it should not bubble. We determine whether it was1060    // cloned by comparing the child pointer.1061    const shouldBubbleActualDurations =1062      completedWork.alternate === null ||1063      completedWork.child !== completedWork.alternate.child;1064    let child = completedWork.child;1065    while (child !== null) {1066      const childUpdateExpirationTime = child.expirationTime;1067      const childChildExpirationTime = child.childExpirationTime;1068      if (childUpdateExpirationTime > newChildExpirationTime) {1069        newChildExpirationTime = childUpdateExpirationTime;1070      }1071      if (childChildExpirationTime > newChildExpirationTime) {1072        newChildExpirationTime = childChildExpirationTime;1073      }1074      if (shouldBubbleActualDurations) {1075        actualDuration += child.actualDuration;1076      }1077      treeBaseDuration += child.treeBaseDuration;1078      child = child.sibling;1079    }1080    completedWork.actualDuration = actualDuration;1081    completedWork.treeBaseDuration = treeBaseDuration;1082  } else {1083    let child = completedWork.child;1084    while (child !== null) {1085      const childUpdateExpirationTime = child.expirationTime;1086      const childChildExpirationTime = child.childExpirationTime;1087      if (childUpdateExpirationTime > newChildExpirationTime) {1088        newChildExpirationTime = childUpdateExpirationTime;1089      }1090      if (childChildExpirationTime > newChildExpirationTime) {1091        newChildExpirationTime = childChildExpirationTime;1092      }1093      child = child.sibling;1094    }1095  }1096  completedWork.childExpirationTime = newChildExpirationTime;1097}1098function commitRoot(root, expirationTime) {1099  runWithPriority(1100    ImmediatePriority,1101    commitRootImpl.bind(null, root, expirationTime),1102  );1103  // If there are passive effects, schedule a callback to flush them. This goes1104  // outside commitRootImpl so that it inherits the priority of the render.1105  if (rootWithPendingPassiveEffects !== null) {1106    const priorityLevel = getCurrentPriorityLevel();1107    scheduleCallback(priorityLevel, () => {1108      flushPassiveEffects();1109      return null;1110    });1111  }1112  return null;1113}1114function commitRootImpl(root, expirationTime) {1115  flushPassiveEffects();1116  flushRenderPhaseStrictModeWarningsInDEV();1117  invariant(1118    workPhase !== RenderPhase && workPhase !== CommitPhase,1119    'Should not already be working.',1120  );1121  const finishedWork = root.current.alternate;1122  invariant(finishedWork !== null, 'Should have a work-in-progress root.');1123  // commitRoot never returns a continuation; it always finishes synchronously.1124  // So we can clear these now to allow a new callback to be scheduled.1125  root.callbackNode = null;1126  root.callbackExpirationTime = NoWork;1127  startCommitTimer();1128  // Update the first and last pending times on this root. The new first1129  // pending time is whatever is left on the root fiber.1130  const updateExpirationTimeBeforeCommit = finishedWork.expirationTime;1131  const childExpirationTimeBeforeCommit = finishedWork.childExpirationTime;1132  const firstPendingTimeBeforeCommit =1133    childExpirationTimeBeforeCommit > updateExpirationTimeBeforeCommit1134      ? childExpirationTimeBeforeCommit1135      : updateExpirationTimeBeforeCommit;1136  root.firstPendingTime = firstPendingTimeBeforeCommit;1137  if (firstPendingTimeBeforeCommit < root.lastPendingTime) {1138    // This usually means we've finished all the work, but it can also happen1139    // when something gets downprioritized during render, like a hidden tree.1140    root.lastPendingTime = firstPendingTimeBeforeCommit;1141  }1142  if (root === workInProgressRoot) {1143    // We can reset these now that they are finished.1144    workInProgressRoot = null;1145    workInProgress = null;1146    renderExpirationTime = NoWork;1147  } else {1148    // This indicates that the last root we worked on is not the same one that1149    // we're committing now. This most commonly happens when a suspended root1150    // times out.1151  }1152  // Get the list of effects.1153  let firstEffect;1154  if (finishedWork.effectTag > PerformedWork) {1155    // A fiber's effect list consists only of its children, not itself. So if1156    // the root has an effect, we need to add it to the end of the list. The1157    // resulting list is the set that would belong to the root's parent, if it1158    // had one; that is, all the effects in the tree including the root.1159    if (finishedWork.lastEffect !== null) {1160      finishedWork.lastEffect.nextEffect = finishedWork;1161      firstEffect = finishedWork.firstEffect;1162    } else {1163      firstEffect = finishedWork;1164    }1165  } else {1166    // There is no effect on the root.1167    firstEffect = finishedWork.firstEffect;1168  }1169  if (firstEffect !== null) {1170    const prevWorkPhase = workPhase;1171    workPhase = CommitPhase;1172    let prevInteractions: Set<Interaction> | null = null;1173    if (enableSchedulerTracing) {1174      prevInteractions = __interactionsRef.current;1175      __interactionsRef.current = root.memoizedInteractions;1176    }1177    // Reset this to null before calling lifecycles1178    ReactCurrentOwner.current = null;1179    // The commit phase is broken into several sub-phases. We do a separate pass1180    // of the effect list for each phase: all mutation effects come before all1181    // layout effects, and so on.1182    // The first phase a "before mutation" phase. We use this phase to read the1183    // state of the host tree right before we mutate it. This is where1184    // getSnapshotBeforeUpdate is called.1185    startCommitSnapshotEffectsTimer();1186    prepareForCommit(root.containerInfo);1187    nextEffect = firstEffect;1188    do {1189      if (__DEV__) {1190        invokeGuardedCallback(null, commitBeforeMutationEffects, null);1191        if (hasCaughtError()) {1192          invariant(nextEffect !== null, 'Should be working on an effect.');1193          const error = clearCaughtError();1194          captureCommitPhaseError(nextEffect, error);1195          nextEffect = nextEffect.nextEffect;1196        }1197      } else {1198        try {1199          commitBeforeMutationEffects();1200        } catch (error) {1201          invariant(nextEffect !== null, 'Should be working on an effect.');1202          captureCommitPhaseError(nextEffect, error);1203          nextEffect = nextEffect.nextEffect;1204        }1205      }1206    } while (nextEffect !== null);1207    stopCommitSnapshotEffectsTimer();1208    if (enableProfilerTimer) {1209      // Mark the current commit time to be shared by all Profilers in this1210      // batch. This enables them to be grouped later.1211      recordCommitTime();1212    }1213    // The next phase is the mutation phase, where we mutate the host tree.1214    startCommitHostEffectsTimer();1215    nextEffect = firstEffect;1216    do {1217      if (__DEV__) {1218        invokeGuardedCallback(null, commitMutationEffects, null);1219        if (hasCaughtError()) {1220          invariant(nextEffect !== null, 'Should be working on an effect.');1221          const error = clearCaughtError();1222          captureCommitPhaseError(nextEffect, error);1223          nextEffect = nextEffect.nextEffect;1224        }1225      } else {1226        try {1227          commitMutationEffects();1228        } catch (error) {1229          invariant(nextEffect !== null, 'Should be working on an effect.');1230          captureCommitPhaseError(nextEffect, error);1231          nextEffect = nextEffect.nextEffect;1232        }1233      }1234    } while (nextEffect !== null);1235    stopCommitHostEffectsTimer();1236    resetAfterCommit(root.containerInfo);1237    // The work-in-progress tree is now the current tree. This must come after1238    // the mutation phase, so that the previous tree is still current during1239    // componentWillUnmount, but before the layout phase, so that the finished1240    // work is current during componentDidMount/Update.1241    root.current = finishedWork;1242    // The next phase is the layout phase, where we call effects that read1243    // the host tree after it's been mutated. The idiomatic use case for this is1244    // layout, but class component lifecycles also fire here for legacy reasons.1245    startCommitLifeCyclesTimer();1246    nextEffect = firstEffect;1247    do {1248      if (__DEV__) {1249        invokeGuardedCallback(1250          null,1251          commitLayoutEffects,1252          null,1253          root,1254          expirationTime,1255        );1256        if (hasCaughtError()) {1257          invariant(nextEffect !== null, 'Should be working on an effect.');1258          const error = clearCaughtError();1259          captureCommitPhaseError(nextEffect, error);1260          nextEffect = nextEffect.nextEffect;1261        }1262      } else {1263        try {1264          commitLayoutEffects(root, expirationTime);1265        } catch (error) {1266          invariant(nextEffect !== null, 'Should be working on an effect.');1267          captureCommitPhaseError(nextEffect, error);1268          nextEffect = nextEffect.nextEffect;1269        }1270      }1271    } while (nextEffect !== null);1272    stopCommitLifeCyclesTimer();1273    nextEffect = null;1274    if (enableSchedulerTracing) {1275      __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);1276    }1277    workPhase = prevWorkPhase;1278  } else {1279    // No effects.1280    root.current = finishedWork;1281    // Measure these anyway so the flamegraph explicitly shows that there were1282    // no effects.1283    // TODO: Maybe there's a better way to report this.1284    startCommitSnapshotEffectsTimer();1285    stopCommitSnapshotEffectsTimer();1286    if (enableProfilerTimer) {1287      recordCommitTime();1288    }1289    startCommitHostEffectsTimer();1290    stopCommitHostEffectsTimer();1291    startCommitLifeCyclesTimer();1292    stopCommitLifeCyclesTimer();1293  }1294  stopCommitTimer();1295  if (rootDoesHavePassiveEffects) {1296    // This commit has passive effects. Stash a reference to them. But don't1297    // schedule a callback until after flushing layout work.1298    rootDoesHavePassiveEffects = false;1299    rootWithPendingPassiveEffects = root;1300    pendingPassiveEffectsExpirationTime = expirationTime;1301  } else {1302    if (enableSchedulerTracing) {1303      // If there are no passive effects, then we can complete the pending1304      // interactions. Otherwise, we'll wait until after the passive effects1305      // are flushed.1306      finishPendingInteractions(root, expirationTime);1307    }1308  }1309  // Check if there's remaining work on this root1310  const remainingExpirationTime = root.firstPendingTime;1311  if (remainingExpirationTime !== NoWork) {1312    const currentTime = requestCurrentTime();1313    const priorityLevel = inferPriorityFromExpirationTime(1314      currentTime,1315      remainingExpirationTime,1316    );1317    scheduleCallbackForRoot(root, priorityLevel, remainingExpirationTime);1318  } else {1319    // If there's no remaining work, we can clear the set of already failed1320    // error boundaries.1321    legacyErrorBoundariesThatAlreadyFailed = null;1322  }1323  onCommitRoot(finishedWork.stateNode);1324  if (remainingExpirationTime === Sync) {1325    // Count the number of times the root synchronously re-renders without1326    // finishing. If there are too many, it indicates an infinite update loop.1327    if (root === rootWithNestedUpdates) {1328      nestedUpdateCount++;1329    } else {1330      nestedUpdateCount = 0;1331      rootWithNestedUpdates = root;1332    }1333  } else {1334    nestedUpdateCount = 0;1335  }1336  if (hasUncaughtError) {1337    hasUncaughtError = false;1338    const error = firstUncaughtError;1339    firstUncaughtError = null;1340    throw error;1341  }1342  if (workPhase === LegacyUnbatchedPhase) {1343    // This is a legacy edge case. We just committed the initial mount of1344    // a ReactDOM.render-ed root inside of batchedUpdates. The commit fired1345    // synchronously, but layout updates should be deferred until the end1346    // of the batch.1347    return null;1348  }1349  // If layout work was scheduled, flush it now.1350  flushImmediateQueue();1351  return null;1352}1353function commitBeforeMutationEffects() {1354  while (nextEffect !== null) {1355    if ((nextEffect.effectTag & Snapshot) !== NoEffect) {1356      setCurrentDebugFiberInDEV(nextEffect);1357      recordEffect();1358      const current = nextEffect.alternate;1359      commitBeforeMutationEffectOnFiber(current, nextEffect);1360      resetCurrentDebugFiberInDEV();1361    }1362    nextEffect = nextEffect.nextEffect;1363  }1364}1365function commitMutationEffects() {1366  // TODO: Should probably move the bulk of this function to commitWork.1367  while (nextEffect !== null) {1368    setCurrentDebugFiberInDEV(nextEffect);1369    const effectTag = nextEffect.effectTag;1370    if (effectTag & ContentReset) {1371      commitResetTextContent(nextEffect);1372    }1373    if (effectTag & Ref) {1374      const current = nextEffect.alternate;1375      if (current !== null) {1376        commitDetachRef(current);1377      }1378    }1379    // The following switch statement is only concerned about placement,1380    // updates, and deletions. To avoid needing to add a case for every possible1381    // bitmap value, we remove the secondary effects from the effect tag and1382    // switch on that value.1383    let primaryEffectTag = effectTag & (Placement | Update | Deletion);1384    switch (primaryEffectTag) {1385      case Placement: {1386        commitPlacement(nextEffect);1387        // Clear the "placement" from effect tag so that we know that this is1388        // inserted, before any life-cycles like componentDidMount gets called.1389        // TODO: findDOMNode doesn't rely on this any more but isMounted does1390        // and isMounted is deprecated anyway so we should be able to kill this.1391        nextEffect.effectTag &= ~Placement;1392        break;1393      }1394      case PlacementAndUpdate: {1395        // Placement1396        commitPlacement(nextEffect);1397        // Clear the "placement" from effect tag so that we know that this is1398        // inserted, before any life-cycles like componentDidMount gets called.1399        nextEffect.effectTag &= ~Placement;1400        // Update1401        const current = nextEffect.alternate;1402        commitWork(current, nextEffect);1403        break;1404      }1405      case Update: {1406        const current = nextEffect.alternate;1407        commitWork(current, nextEffect);1408        break;1409      }1410      case Deletion: {1411        commitDeletion(nextEffect);1412        break;1413      }1414    }1415    // TODO: Only record a mutation effect if primaryEffectTag is non-zero.1416    recordEffect();1417    resetCurrentDebugFiberInDEV();1418    nextEffect = nextEffect.nextEffect;1419  }1420}1421function commitLayoutEffects(1422  root: FiberRoot,1423  committedExpirationTime: ExpirationTime,1424) {1425  // TODO: Should probably move the bulk of this function to commitWork.1426  while (nextEffect !== null) {1427    setCurrentDebugFiberInDEV(nextEffect);1428    const effectTag = nextEffect.effectTag;1429    if (effectTag & (Update | Callback)) {1430      recordEffect();1431      const current = nextEffect.alternate;1432      commitLayoutEffectOnFiber(1433        root,1434        current,1435        nextEffect,1436        committedExpirationTime,1437      );1438    }1439    if (effectTag & Ref) {1440      recordEffect();1441      commitAttachRef(nextEffect);1442    }1443    if (effectTag & Passive) {1444      rootDoesHavePassiveEffects = true;1445    }1446    resetCurrentDebugFiberInDEV();1447    nextEffect = nextEffect.nextEffect;1448  }1449}1450export function flushPassiveEffects() {1451  if (rootWithPendingPassiveEffects === null) {1452    return false;1453  }1454  const root = rootWithPendingPassiveEffects;1455  const expirationTime = pendingPassiveEffectsExpirationTime;1456  rootWithPendingPassiveEffects = null;1457  pendingPassiveEffectsExpirationTime = NoWork;1458  let prevInteractions: Set<Interaction> | null = null;1459  if (enableSchedulerTracing) {1460    prevInteractions = __interactionsRef.current;1461    __interactionsRef.current = root.memoizedInteractions;1462  }1463  invariant(1464    workPhase !== RenderPhase && workPhase !== CommitPhase,1465    'Cannot flush passive effects while already rendering.',1466  );1467  const prevWorkPhase = workPhase;1468  workPhase = CommitPhase;1469  // Note: This currently assumes there are no passive effects on the root1470  // fiber, because the root is not part of its own effect list. This could1471  // change in the future.1472  let effect = root.current.firstEffect;1473  while (effect !== null) {1474    if (__DEV__) {1475      setCurrentDebugFiberInDEV(effect);1476      invokeGuardedCallback(null, commitPassiveHookEffects, null, effect);1477      if (hasCaughtError()) {1478        invariant(effect !== null, 'Should be working on an effect.');1479        const error = clearCaughtError();1480        captureCommitPhaseError(effect, error);1481      }1482      resetCurrentDebugFiberInDEV();1483    } else {1484      try {1485        commitPassiveHookEffects(effect);1486      } catch (error) {1487        invariant(effect !== null, 'Should be working on an effect.');1488        captureCommitPhaseError(effect, error);1489      }1490    }1491    effect = effect.nextEffect;1492  }1493  if (enableSchedulerTracing) {1494    __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);1495    finishPendingInteractions(root, expirationTime);1496  }1497  workPhase = prevWorkPhase;1498  flushImmediateQueue();1499  // If additional passive effects were scheduled, increment a counter. If this1500  // exceeds the limit, we'll fire a warning.1501  nestedPassiveUpdateCount =1502    rootWithPendingPassiveEffects === null ? 0 : nestedPassiveUpdateCount + 1;1503  return true;1504}1505export function isAlreadyFailedLegacyErrorBoundary(instance: mixed): boolean {1506  return (1507    legacyErrorBoundariesThatAlreadyFailed !== null &&1508    legacyErrorBoundariesThatAlreadyFailed.has(instance)1509  );1510}1511export function markLegacyErrorBoundaryAsFailed(instance: mixed) {1512  if (legacyErrorBoundariesThatAlreadyFailed === null) {1513    legacyErrorBoundariesThatAlreadyFailed = new Set([instance]);1514  } else {1515    legacyErrorBoundariesThatAlreadyFailed.add(instance);1516  }1517}1518function prepareToThrowUncaughtError(error: mixed) {1519  if (!hasUncaughtError) {1520    hasUncaughtError = true;1521    firstUncaughtError = error;1522  }1523}1524export const onUncaughtError = prepareToThrowUncaughtError;1525function captureCommitPhaseErrorOnRoot(1526  rootFiber: Fiber,1527  sourceFiber: Fiber,1528  error: mixed,1529) {1530  const errorInfo = createCapturedValue(error, sourceFiber);1531  const update = createRootErrorUpdate(rootFiber, errorInfo, Sync);1532  enqueueUpdate(rootFiber, update);1533  const root = markUpdateTimeFromFiberToRoot(rootFiber, Sync);1534  if (root !== null) {1535    scheduleCallbackForRoot(root, ImmediatePriority, Sync);1536  }1537}1538export function captureCommitPhaseError(sourceFiber: Fiber, error: mixed) {1539  if (sourceFiber.tag === HostRoot) {1540    // Error was thrown at the root. There is no parent, so the root1541    // itself should capture it.1542    captureCommitPhaseErrorOnRoot(sourceFiber, sourceFiber, error);1543    return;1544  }1545  let fiber = sourceFiber.return;1546  while (fiber !== null) {1547    if (fiber.tag === HostRoot) {1548      captureCommitPhaseErrorOnRoot(fiber, sourceFiber, error);1549      return;1550    } else if (fiber.tag === ClassComponent) {1551      const ctor = fiber.type;1552      const instance = fiber.stateNode;1553      if (1554        typeof ctor.getDerivedStateFromError === 'function' ||1555        (typeof instance.componentDidCatch === 'function' &&1556          !isAlreadyFailedLegacyErrorBoundary(instance))1557      ) {1558        const errorInfo = createCapturedValue(error, sourceFiber);1559        const update = createClassErrorUpdate(1560          fiber,1561          errorInfo,1562          // TODO: This is always sync1563          Sync,1564        );1565        enqueueUpdate(fiber, update);1566        const root = markUpdateTimeFromFiberToRoot(fiber, Sync);1567        if (root !== null) {1568          scheduleCallbackForRoot(root, ImmediatePriority, Sync);1569        }1570        return;1571      }1572    }1573    fiber = fiber.return;1574  }1575}1576export function pingSuspendedRoot(1577  root: FiberRoot,1578  thenable: Thenable,1579  suspendedTime: ExpirationTime,1580) {1581  const pingCache = root.pingCache;1582  if (pingCache !== null) {1583    // The thenable resolved, so we no longer need to memoize, because it will1584    // never be thrown again.1585    pingCache.delete(thenable);1586  }1587  if (workInProgressRoot === root && renderExpirationTime === suspendedTime) {1588    // Received a ping at the same priority level at which we're currently1589    // rendering. Restart from the root. Don't need to schedule a ping because1590    // we're already working on this tree.1591    prepareFreshStack(root, renderExpirationTime);1592    return;1593  }1594  const lastPendingTime = root.lastPendingTime;1595  if (lastPendingTime < suspendedTime) {1596    // The root is no longer suspended at this time.1597    return;1598  }1599  const pingTime = root.pingTime;1600  if (pingTime !== NoWork && pingTime < suspendedTime) {1601    // There's already a lower priority ping scheduled.1602    return;1603  }1604  // Mark the time at which this ping was scheduled.1605  root.pingTime = suspendedTime;1606  const currentTime = requestCurrentTime();1607  const priorityLevel = inferPriorityFromExpirationTime(1608    currentTime,1609    suspendedTime,1610  );1611  scheduleCallbackForRoot(root, priorityLevel, suspendedTime);1612}1613export function retryTimedOutBoundary(boundaryFiber: Fiber) {1614  // The boundary fiber (a Suspense component) previously timed out and was1615  // rendered in its fallback state. One of the promises that suspended it has1616  // resolved, which means at least part of the tree was likely unblocked. Try1617  // rendering again, at a new expiration time.1618  const currentTime = requestCurrentTime();1619  const retryTime = computeExpirationForFiber(currentTime, boundaryFiber);1620  // TODO: Special case idle priority?1621  const priorityLevel = inferPriorityFromExpirationTime(currentTime, retryTime);1622  const root = markUpdateTimeFromFiberToRoot(boundaryFiber, retryTime);1623  if (root !== null) {1624    scheduleCallbackForRoot(root, priorityLevel, retryTime);1625  }1626}1627export function resolveRetryThenable(boundaryFiber: Fiber, thenable: Thenable) {1628  let retryCache: WeakSet<Thenable> | Set<Thenable> | null;1629  if (enableSuspenseServerRenderer) {1630    switch (boundaryFiber.tag) {1631      case SuspenseComponent:1632        retryCache = boundaryFiber.stateNode;1633        break;1634      case DehydratedSuspenseComponent:1635        retryCache = boundaryFiber.memoizedState;1636        break;1637      default:1638        invariant(1639          false,1640          'Pinged unknown suspense boundary type. ' +1641            'This is probably a bug in React.',1642        );1643    }1644  } else {1645    retryCache = boundaryFiber.stateNode;1646  }1647  if (retryCache !== null) {1648    // The thenable resolved, so we no longer need to memoize, because it will1649    // never be thrown again.1650    retryCache.delete(thenable);1651  }1652  retryTimedOutBoundary(boundaryFiber);1653}1654// Computes the next Just Noticeable Difference (JND) boundary.1655// The theory is that a person can't tell the difference between small differences in time.1656// Therefore, if we wait a bit longer than necessary that won't translate to a noticeable1657// difference in the experience. However, waiting for longer might mean that we can avoid1658// showing an intermediate loading state. The longer we have already waited, the harder it1659// is to tell small differences in time. Therefore, the longer we've already waited,1660// the longer we can wait additionally. At some point we have to give up though.1661// We pick a train model where the next boundary commits at a consistent schedule.1662// These particular numbers are vague estimates. We expect to adjust them based on research.1663function jnd(timeElapsed: number) {1664  return timeElapsed < 1201665    ? 1201666    : timeElapsed < 4801667      ? 4801668      : timeElapsed < 10801669        ? 10801670        : timeElapsed < 19201671          ? 19201672          : timeElapsed < 30001673            ? 30001674            : timeElapsed < 43201675              ? 43201676              : ceil(timeElapsed / 1960) * 1960;1677}1678function computeMsUntilTimeout(1679  mostRecentEventTime: ExpirationTime,1680  committedExpirationTime: ExpirationTime,1681) {1682  if (disableYielding) {1683    // Timeout immediately when yielding is disabled.1684    return 0;1685  }1686  const eventTimeMs: number = inferTimeFromExpirationTime(mostRecentEventTime);1687  const currentTimeMs: number = now();1688  const timeElapsed = currentTimeMs - eventTimeMs;1689  let msUntilTimeout = jnd(timeElapsed) - timeElapsed;1690  // Compute the time until this render pass would expire.1691  const timeUntilExpirationMs =1692    expirationTimeToMs(committedExpirationTime) - currentTimeMs;1693  // Clamp the timeout to the expiration time.1694  // TODO: Once the event time is exact instead of inferred from expiration time1695  // we don't need this.1696  if (timeUntilExpirationMs < msUntilTimeout) {1697    msUntilTimeout = timeUntilExpirationMs;1698  }1699  // This is the value that is passed to `setTimeout`.1700  return msUntilTimeout;1701}1702function checkForNestedUpdates() {1703  if (nestedUpdateCount > NESTED_UPDATE_LIMIT) {1704    nestedUpdateCount = 0;1705    rootWithNestedUpdates = null;1706    invariant(1707      false,1708      'Maximum update depth exceeded. This can happen when a component ' +1709        'repeatedly calls setState inside componentWillUpdate or ' +1710        'componentDidUpdate. React limits the number of nested updates to ' +1711        'prevent infinite loops.',1712    );1713  }1714  if (__DEV__) {1715    if (nestedPassiveUpdateCount > NESTED_PASSIVE_UPDATE_LIMIT) {1716      nestedPassiveUpdateCount = 0;1717      warning(1718        false,1719        'Maximum update depth exceeded. This can happen when a component ' +1720          "calls setState inside useEffect, but useEffect either doesn't " +1721          'have a dependency array, or one of the dependencies changes on ' +1722          'every render.',1723      );1724    }1725  }1726}1727function flushRenderPhaseStrictModeWarningsInDEV() {1728  if (__DEV__) {1729    ReactStrictModeWarnings.flushPendingUnsafeLifecycleWarnings();1730    ReactStrictModeWarnings.flushLegacyContextWarning();1731    if (warnAboutDeprecatedLifecycles) {1732      ReactStrictModeWarnings.flushPendingDeprecationWarnings();1733    }1734  }1735}1736function stopFinishedWorkLoopTimer() {1737  const didCompleteRoot = true;1738  stopWorkLoopTimer(interruptedBy, didCompleteRoot);1739  interruptedBy = null;1740}1741function stopInterruptedWorkLoopTimer() {1742  // TODO: Track which fiber caused the interruption.1743  const didCompleteRoot = false;1744  stopWorkLoopTimer(interruptedBy, didCompleteRoot);1745  interruptedBy = null;1746}1747function checkForInterruption(1748  fiberThatReceivedUpdate: Fiber,1749  updateExpirationTime: ExpirationTime,1750) {1751  if (1752    enableUserTimingAPI &&1753    workInProgressRoot !== null &&1754    updateExpirationTime > renderExpirationTime1755  ) {1756    interruptedBy = fiberThatReceivedUpdate;1757  }1758}1759let didWarnStateUpdateForUnmountedComponent: Set<string> | null = null;1760function warnAboutUpdateOnUnmountedFiberInDEV(fiber) {1761  if (__DEV__) {1762    const tag = fiber.tag;1763    if (1764      tag !== HostRoot &&1765      tag !== ClassComponent &&1766      tag !== FunctionComponent &&1767      tag !== ForwardRef &&1768      tag !== MemoComponent &&1769      tag !== SimpleMemoComponent1770    ) {1771      // Only warn for user-defined components, not internal ones like Suspense.1772      return;1773    }1774    // We show the whole stack but dedupe on the top component's name because1775    // the problematic code almost always lies inside that component.1776    const componentName = getComponentName(fiber.type) || 'ReactComponent';1777    if (didWarnStateUpdateForUnmountedComponent !== null) {1778      if (didWarnStateUpdateForUnmountedComponent.has(componentName)) {1779        return;1780      }1781      didWarnStateUpdateForUnmountedComponent.add(componentName);1782    } else {1783      didWarnStateUpdateForUnmountedComponent = new Set([componentName]);1784    }1785    warningWithoutStack(1786      false,1787      "Can't perform a React state update on an unmounted component. This " +1788        'is a no-op, but it indicates a memory leak in your application. To ' +1789        'fix, cancel all subscriptions and asynchronous tasks in %s.%s',1790      tag === ClassComponent1791        ? 'the componentWillUnmount method'1792        : 'a useEffect cleanup function',1793      getStackByFiberInDevAndProd(fiber),1794    );1795  }1796}1797let beginWork;1798if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {1799  let dummyFiber = null;1800  beginWork = (current, unitOfWork, expirationTime) => {1801    // If a component throws an error, we replay it again in a synchronously1802    // dispatched event, so that the debugger will treat it as an uncaught1803    // error See ReactErrorUtils for more information.1804    // Before entering the begin phase, copy the work-in-progress onto a dummy1805    // fiber. If beginWork throws, we'll use this to reset the state.1806    const originalWorkInProgressCopy = assignFiberPropertiesInDEV(1807      dummyFiber,1808      unitOfWork,1809    );1810    try {1811      return originalBeginWork(current, unitOfWork, expirationTime);1812    } catch (originalError) {1813      if (1814        originalError !== null &&1815        typeof originalError === 'object' &&1816        typeof originalError.then === 'function'1817      ) {1818        // Don't replay promises. Treat everything else like an error.1819        throw originalError;1820      }1821      // Keep this code in sync with renderRoot; any changes here must have1822      // corresponding changes there.1823      resetContextDependencies();1824      resetHooks();1825      // Unwind the failed stack frame1826      unwindInterruptedWork(unitOfWork);1827      // Restore the original properties of the fiber.1828      assignFiberPropertiesInDEV(unitOfWork, originalWorkInProgressCopy);1829      if (enableProfilerTimer && unitOfWork.mode & ProfileMode) {1830        // Reset the profiler timer.1831        startProfilerTimer(unitOfWork);1832      }1833      // Run beginWork again.1834      invokeGuardedCallback(1835        null,1836        originalBeginWork,1837        null,...

ReactFiberScheduler.new.js

Source:ReactFiberScheduler.new.js

...689        const currentTime = requestCurrentTime();690        if (currentTime < expirationTime) {691          // Restart at the current time.692          workPhase = prevWorkPhase;693          resetContextDependencies();694          ReactCurrentDispatcher.current = prevDispatcher;695          if (enableSchedulerTracing) {696            __interactionsRef.current = ((prevInteractions: any): Set<697              Interaction,698            >);699          }700          return renderRoot.bind(null, root, currentTime);701        }702      }703    } else {704      // Since we know we're in a React event, we can clear the current705      // event time. The next update will compute a new event time.706      currentEventTime = NoWork;707    }708    do {709      try {710        if (isSync) {711          workLoopSync();712        } else {713          workLoop();714        }715        break;716      } catch (thrownValue) {717        // Reset module-level state that was set during the render phase.718        resetContextDependencies();719        resetHooks();720        const sourceFiber = workInProgress;721        if (sourceFiber === null || sourceFiber.return === null) {722          // Expected to be working on a non-root fiber. This is a fatal error723          // because there's no ancestor that can handle it; the root is724          // supposed to capture all errors that weren't caught by an error725          // boundary.726          prepareFreshStack(root, expirationTime);727          workPhase = prevWorkPhase;728          throw thrownValue;729        }730        if (enableProfilerTimer && sourceFiber.mode & ProfileMode) {731          // Record the time spent rendering before an error was thrown. This732          // avoids inaccurate Profiler durations in the case of a733          // suspended render.734          stopProfilerTimerIfRunningAndRecordDelta(sourceFiber, true);735        }736        const returnFiber = sourceFiber.return;737        throwException(738          root,739          returnFiber,740          sourceFiber,741          thrownValue,742          renderExpirationTime,743        );744        workInProgress = completeUnitOfWork(sourceFiber);745      }746    } while (true);747    workPhase = prevWorkPhase;748    resetContextDependencies();749    ReactCurrentDispatcher.current = prevDispatcher;750    if (enableSchedulerTracing) {751      __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);752    }753    if (workInProgress !== null) {754      // There's still work left over. Return a continuation.755      stopInterruptedWorkLoopTimer();756      if (expirationTime !== Sync) {757        startRequestCallbackTimer();758      }759      return renderRoot.bind(null, root, expirationTime);760    }761  }762  // We now have a consistent tree. The next step is either to commit it, or, if763  // something suspended, wait to commit it after a timeout.764  stopFinishedWorkLoopTimer();765  const isLocked = resolveLocksOnRoot(root, expirationTime);766  if (isLocked) {767    // This root has a lock that prevents it from committing. Exit. If we begin768    // work on the root again, without any intervening updates, it will finish769    // without doing additional work.770    return null;771  }772  // Set this to null to indicate there's no in-progress render.773  workInProgressRoot = null;774  switch (workInProgressRootExitStatus) {775    case RootIncomplete: {776      invariant(false, 'Should have a work-in-progress.');777    }778    // Flow knows about invariant, so it compains if I add a break statement,779    // but eslint doesn't know about invariant, so it complains if I do.780    // eslint-disable-next-line no-fallthrough781    case RootErrored: {782      // An error was thrown. First check if there is lower priority work783      // scheduled on this root.784      const lastPendingTime = root.lastPendingTime;785      if (root.lastPendingTime < expirationTime) {786        // There's lower priority work. Before raising the error, try rendering787        // at the lower priority to see if it fixes it. Use a continuation to788        // maintain the existing priority and position in the queue.789        return renderRoot.bind(null, root, lastPendingTime);790      }791      if (!isSync) {792        // If we're rendering asynchronously, it's possible the error was793        // caused by tearing due to a mutation during an event. Try rendering794        // one more time without yiedling to events.795        prepareFreshStack(root, expirationTime);796        scheduleCallback(797          ImmediatePriority,798          renderRoot.bind(null, root, expirationTime),799        );800        return null;801      }802      // If we're already rendering synchronously, commit the root in its803      // errored state.804      return commitRoot.bind(null, root, expirationTime);805    }806    case RootSuspended: {807      const lastPendingTime = root.lastPendingTime;808      if (root.lastPendingTime < expirationTime) {809        // There's lower priority work. It might be unsuspended. Try rendering810        // at that level.811        return renderRoot.bind(null, root, lastPendingTime);812      }813      if (!isSync) {814        const msUntilTimeout = computeMsUntilTimeout(815          root,816          workInProgressRootAbsoluteTimeoutMs,817        );818        if (msUntilTimeout > 0) {819          // The render is suspended, it hasn't timed out, and there's no lower820          // priority work to do. Instead of committing the fallback821          // immediately, wait for more data to arrive.822          root.timeoutHandle = scheduleTimeout(823            commitRoot.bind(null, root, expirationTime),824            msUntilTimeout,825          );826          return null;827        }828      }829      // The work expired. Commit immediately.830      return commitRoot.bind(null, root, expirationTime);831    }832    case RootCompleted: {833      // The work completed. Ready to commit.834      return commitRoot.bind(null, root, expirationTime);835    }836    default: {837      invariant(false, 'Unknown root exit status.');838    }839  }840}841export function renderDidSuspend(842  root: FiberRoot,843  absoluteTimeoutMs: number,844  // TODO: Don't need this argument anymore845  suspendedTime: ExpirationTime,846) {847  if (848    absoluteTimeoutMs >= 0 &&849    workInProgressRootAbsoluteTimeoutMs < absoluteTimeoutMs850  ) {851    workInProgressRootAbsoluteTimeoutMs = absoluteTimeoutMs;852    if (workInProgressRootExitStatus === RootIncomplete) {853      workInProgressRootExitStatus = RootSuspended;854    }855  }856}857export function renderDidError() {858  if (859    workInProgressRootExitStatus === RootIncomplete ||860    workInProgressRootExitStatus === RootSuspended861  ) {862    workInProgressRootExitStatus = RootErrored;863  }864}865function workLoopSync() {866  // Already timed out, so perform work without checking if we need to yield.867  while (workInProgress !== null) {868    workInProgress = performUnitOfWork(workInProgress);869  }870}871function workLoop() {872  // Perform work until Scheduler asks us to yield873  while (workInProgress !== null && !shouldYield()) {874    workInProgress = performUnitOfWork(workInProgress);875  }876}877function performUnitOfWork(unitOfWork: Fiber): Fiber | null {878  // The current, flushed, state of this fiber is the alternate. Ideally879  // nothing should rely on this, but relying on it here means that we don't880  // need an additional field on the work in progress.881  const current = unitOfWork.alternate;882  startWorkTimer(unitOfWork);883  setCurrentDebugFiberInDEV(unitOfWork);884  let next;885  if (enableProfilerTimer && (unitOfWork.mode & ProfileMode) !== NoContext) {886    startProfilerTimer(unitOfWork);887    next = beginWork(current, unitOfWork, renderExpirationTime);888    stopProfilerTimerIfRunningAndRecordDelta(unitOfWork, true);889  } else {890    next = beginWork(current, unitOfWork, renderExpirationTime);891  }892  resetCurrentDebugFiberInDEV();893  unitOfWork.memoizedProps = unitOfWork.pendingProps;894  if (next === null) {895    // If this doesn't spawn new work, complete the current work.896    next = completeUnitOfWork(unitOfWork);897  }898  ReactCurrentOwner.current = null;899  return next;900}901function completeUnitOfWork(unitOfWork: Fiber): Fiber | null {902  // Attempt to complete the current unit of work, then move to the next903  // sibling. If there are no more siblings, return to the parent fiber.904  workInProgress = unitOfWork;905  do {906    // The current, flushed, state of this fiber is the alternate. Ideally907    // nothing should rely on this, but relying on it here means that we don't908    // need an additional field on the work in progress.909    const current = workInProgress.alternate;910    const returnFiber = workInProgress.return;911    // Check if the work completed or if something threw.912    if ((workInProgress.effectTag & Incomplete) === NoEffect) {913      setCurrentDebugFiberInDEV(workInProgress);914      let next;915      if (916        !enableProfilerTimer ||917        (workInProgress.mode & ProfileMode) === NoContext918      ) {919        next = completeWork(current, workInProgress, renderExpirationTime);920      } else {921        startProfilerTimer(workInProgress);922        next = completeWork(current, workInProgress, renderExpirationTime);923        // Update render duration assuming we didn't error.924        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);925      }926      stopWorkTimer(workInProgress);927      resetCurrentDebugFiberInDEV();928      resetChildExpirationTime(workInProgress);929      if (next !== null) {930        // Completing this fiber spawned new work. Work on that next.931        return next;932      }933      if (934        returnFiber !== null &&935        // Do not append effects to parents if a sibling failed to complete936        (returnFiber.effectTag & Incomplete) === NoEffect937      ) {938        // Append all the effects of the subtree and this fiber onto the effect939        // list of the parent. The completion order of the children affects the940        // side-effect order.941        if (returnFiber.firstEffect === null) {942          returnFiber.firstEffect = workInProgress.firstEffect;943        }944        if (workInProgress.lastEffect !== null) {945          if (returnFiber.lastEffect !== null) {946            returnFiber.lastEffect.nextEffect = workInProgress.firstEffect;947          }948          returnFiber.lastEffect = workInProgress.lastEffect;949        }950        // If this fiber had side-effects, we append it AFTER the children's951        // side-effects. We can perform certain side-effects earlier if needed,952        // by doing multiple passes over the effect list. We don't want to953        // schedule our own side-effect on our own list because if end up954        // reusing children we'll schedule this effect onto itself since we're955        // at the end.956        const effectTag = workInProgress.effectTag;957        // Skip both NoWork and PerformedWork tags when creating the effect958        // list. PerformedWork effect is read by React DevTools but shouldn't be959        // committed.960        if (effectTag > PerformedWork) {961          if (returnFiber.lastEffect !== null) {962            returnFiber.lastEffect.nextEffect = workInProgress;963          } else {964            returnFiber.firstEffect = workInProgress;965          }966          returnFiber.lastEffect = workInProgress;967        }968      }969    } else {970      // This fiber did not complete because something threw. Pop values off971      // the stack without entering the complete phase. If this is a boundary,972      // capture values if possible.973      const next = unwindWork(workInProgress, renderExpirationTime);974      // Because this fiber did not complete, don't reset its expiration time.975      if (976        enableProfilerTimer &&977        (workInProgress.mode & ProfileMode) !== NoContext978      ) {979        // Record the render duration for the fiber that errored.980        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);981        // Include the time spent working on failed children before continuing.982        let actualDuration = workInProgress.actualDuration;983        let child = workInProgress.child;984        while (child !== null) {985          actualDuration += child.actualDuration;986          child = child.sibling;987        }988        workInProgress.actualDuration = actualDuration;989      }990      if (next !== null) {991        // If completing this work spawned new work, do that next. We'll come992        // back here again.993        // Since we're restarting, remove anything that is not a host effect994        // from the effect tag.995        // TODO: The name stopFailedWorkTimer is misleading because Suspense996        // also captures and restarts.997        stopFailedWorkTimer(workInProgress);998        next.effectTag &= HostEffectMask;999        return next;1000      }1001      stopWorkTimer(workInProgress);1002      if (returnFiber !== null) {1003        // Mark the parent fiber as incomplete and clear its effect list.1004        returnFiber.firstEffect = returnFiber.lastEffect = null;1005        returnFiber.effectTag |= Incomplete;1006      }1007    }1008    const siblingFiber = workInProgress.sibling;1009    if (siblingFiber !== null) {1010      // If there is more work to do in this returnFiber, do that next.1011      return siblingFiber;1012    }1013    // Otherwise, return to the parent1014    workInProgress = returnFiber;1015  } while (workInProgress !== null);1016  // We've reached the root.1017  if (workInProgressRootExitStatus === RootIncomplete) {1018    workInProgressRootExitStatus = RootCompleted;1019  }1020  return null;1021}1022function resetChildExpirationTime(completedWork: Fiber) {1023  if (1024    renderExpirationTime !== Never &&1025    completedWork.childExpirationTime === Never1026  ) {1027    // The children of this component are hidden. Don't bubble their1028    // expiration times.1029    return;1030  }1031  let newChildExpirationTime = NoWork;1032  // Bubble up the earliest expiration time.1033  if (enableProfilerTimer && (completedWork.mode & ProfileMode) !== NoContext) {1034    // In profiling mode, resetChildExpirationTime is also used to reset1035    // profiler durations.1036    let actualDuration = completedWork.actualDuration;1037    let treeBaseDuration = completedWork.selfBaseDuration;1038    // When a fiber is cloned, its actualDuration is reset to 0. This value will1039    // only be updated if work is done on the fiber (i.e. it doesn't bailout).1040    // When work is done, it should bubble to the parent's actualDuration. If1041    // the fiber has not been cloned though, (meaning no work was done), then1042    // this value will reflect the amount of time spent working on a previous1043    // render. In that case it should not bubble. We determine whether it was1044    // cloned by comparing the child pointer.1045    const shouldBubbleActualDurations =1046      completedWork.alternate === null ||1047      completedWork.child !== completedWork.alternate.child;1048    let child = completedWork.child;1049    while (child !== null) {1050      const childUpdateExpirationTime = child.expirationTime;1051      const childChildExpirationTime = child.childExpirationTime;1052      if (childUpdateExpirationTime > newChildExpirationTime) {1053        newChildExpirationTime = childUpdateExpirationTime;1054      }1055      if (childChildExpirationTime > newChildExpirationTime) {1056        newChildExpirationTime = childChildExpirationTime;1057      }1058      if (shouldBubbleActualDurations) {1059        actualDuration += child.actualDuration;1060      }1061      treeBaseDuration += child.treeBaseDuration;1062      child = child.sibling;1063    }1064    completedWork.actualDuration = actualDuration;1065    completedWork.treeBaseDuration = treeBaseDuration;1066  } else {1067    let child = completedWork.child;1068    while (child !== null) {1069      const childUpdateExpirationTime = child.expirationTime;1070      const childChildExpirationTime = child.childExpirationTime;1071      if (childUpdateExpirationTime > newChildExpirationTime) {1072        newChildExpirationTime = childUpdateExpirationTime;1073      }1074      if (childChildExpirationTime > newChildExpirationTime) {1075        newChildExpirationTime = childChildExpirationTime;1076      }1077      child = child.sibling;1078    }1079  }1080  completedWork.childExpirationTime = newChildExpirationTime;1081}1082function commitRoot(root, expirationTime) {1083  runWithPriority(1084    ImmediatePriority,1085    commitRootImpl.bind(null, root, expirationTime),1086  );1087  // If there are passive effects, schedule a callback to flush them. This goes1088  // outside commitRootImpl so that it inherits the priority of the render.1089  if (rootWithPendingPassiveEffects !== null) {1090    const priorityLevel = getCurrentPriorityLevel();1091    scheduleCallback(priorityLevel, () => {1092      flushPassiveEffects();1093      return null;1094    });1095  }1096  return null;1097}1098function commitRootImpl(root, expirationTime) {1099  flushPassiveEffects();1100  flushRenderPhaseStrictModeWarningsInDEV();1101  invariant(1102    workPhase !== RenderPhase && workPhase !== CommitPhase,1103    'Should not already be working.',1104  );1105  const finishedWork = root.current.alternate;1106  invariant(finishedWork !== null, 'Should have a work-in-progress root.');1107  // commitRoot never returns a continuation; it always finishes synchronously.1108  // So we can clear these now to allow a new callback to be scheduled.1109  root.callbackNode = null;1110  root.callbackExpirationTime = NoWork;1111  startCommitTimer();1112  // Update the first and last pending times on this root. The new first1113  // pending time is whatever is left on the root fiber.1114  const updateExpirationTimeBeforeCommit = finishedWork.expirationTime;1115  const childExpirationTimeBeforeCommit = finishedWork.childExpirationTime;1116  const firstPendingTimeBeforeCommit =1117    childExpirationTimeBeforeCommit > updateExpirationTimeBeforeCommit1118      ? childExpirationTimeBeforeCommit1119      : updateExpirationTimeBeforeCommit;1120  root.firstPendingTime = firstPendingTimeBeforeCommit;1121  if (firstPendingTimeBeforeCommit < root.lastPendingTime) {1122    // This usually means we've finished all the work, but it can also happen1123    // when something gets downprioritized during render, like a hidden tree.1124    root.lastPendingTime = firstPendingTimeBeforeCommit;1125  }1126  if (root === workInProgressRoot) {1127    // We can reset these now that they are finished.1128    workInProgressRoot = null;1129    workInProgress = null;1130    renderExpirationTime = NoWork;1131  } else {1132    // This indicates that the last root we worked on is not the same one that1133    // we're committing now. This most commonly happens when a suspended root1134    // times out.1135  }1136  // Get the list of effects.1137  let firstEffect;1138  if (finishedWork.effectTag > PerformedWork) {1139    // A fiber's effect list consists only of its children, not itself. So if1140    // the root has an effect, we need to add it to the end of the list. The1141    // resulting list is the set that would belong to the root's parent, if it1142    // had one; that is, all the effects in the tree including the root.1143    if (finishedWork.lastEffect !== null) {1144      finishedWork.lastEffect.nextEffect = finishedWork;1145      firstEffect = finishedWork.firstEffect;1146    } else {1147      firstEffect = finishedWork;1148    }1149  } else {1150    // There is no effect on the root.1151    firstEffect = finishedWork.firstEffect;1152  }1153  if (firstEffect !== null) {1154    const prevWorkPhase = workPhase;1155    workPhase = CommitPhase;1156    let prevInteractions: Set<Interaction> | null = null;1157    if (enableSchedulerTracing) {1158      prevInteractions = __interactionsRef.current;1159      __interactionsRef.current = root.memoizedInteractions;1160    }1161    // Reset this to null before calling lifecycles1162    ReactCurrentOwner.current = null;1163    // The commit phase is broken into several sub-phases. We do a separate pass1164    // of the effect list for each phase: all mutation effects come before all1165    // layout effects, and so on.1166    // The first phase a "before mutation" phase. We use this phase to read the1167    // state of the host tree right before we mutate it. This is where1168    // getSnapshotBeforeUpdate is called.1169    startCommitSnapshotEffectsTimer();1170    prepareForCommit(root.containerInfo);1171    nextEffect = firstEffect;1172    do {1173      if (__DEV__) {1174        invokeGuardedCallback(null, commitBeforeMutationEffects, null);1175        if (hasCaughtError()) {1176          invariant(nextEffect !== null, 'Should be working on an effect.');1177          const error = clearCaughtError();1178          captureCommitPhaseError(nextEffect, error);1179          nextEffect = nextEffect.nextEffect;1180        }1181      } else {1182        try {1183          commitBeforeMutationEffects();1184        } catch (error) {1185          invariant(nextEffect !== null, 'Should be working on an effect.');1186          captureCommitPhaseError(nextEffect, error);1187          nextEffect = nextEffect.nextEffect;1188        }1189      }1190    } while (nextEffect !== null);1191    stopCommitSnapshotEffectsTimer();1192    if (enableProfilerTimer) {1193      // Mark the current commit time to be shared by all Profilers in this1194      // batch. This enables them to be grouped later.1195      recordCommitTime();1196    }1197    // The next phase is the mutation phase, where we mutate the host tree.1198    startCommitHostEffectsTimer();1199    nextEffect = firstEffect;1200    do {1201      if (__DEV__) {1202        invokeGuardedCallback(null, commitMutationEffects, null);1203        if (hasCaughtError()) {1204          invariant(nextEffect !== null, 'Should be working on an effect.');1205          const error = clearCaughtError();1206          captureCommitPhaseError(nextEffect, error);1207          nextEffect = nextEffect.nextEffect;1208        }1209      } else {1210        try {1211          commitMutationEffects();1212        } catch (error) {1213          invariant(nextEffect !== null, 'Should be working on an effect.');1214          captureCommitPhaseError(nextEffect, error);1215          nextEffect = nextEffect.nextEffect;1216        }1217      }1218    } while (nextEffect !== null);1219    stopCommitHostEffectsTimer();1220    resetAfterCommit(root.containerInfo);1221    // The work-in-progress tree is now the current tree. This must come after1222    // the mutation phase, so that the previous tree is still current during1223    // componentWillUnmount, but before the layout phase, so that the finished1224    // work is current during componentDidMount/Update.1225    root.current = finishedWork;1226    // The next phase is the layout phase, where we call effects that read1227    // the host tree after it's been mutated. The idiomatic use case for this is1228    // layout, but class component lifecycles also fire here for legacy reasons.1229    startCommitLifeCyclesTimer();1230    nextEffect = firstEffect;1231    do {1232      if (__DEV__) {1233        invokeGuardedCallback(1234          null,1235          commitLayoutEffects,1236          null,1237          root,1238          expirationTime,1239        );1240        if (hasCaughtError()) {1241          invariant(nextEffect !== null, 'Should be working on an effect.');1242          const error = clearCaughtError();1243          captureCommitPhaseError(nextEffect, error);1244          nextEffect = nextEffect.nextEffect;1245        }1246      } else {1247        try {1248          commitLayoutEffects(root, expirationTime);1249        } catch (error) {1250          invariant(nextEffect !== null, 'Should be working on an effect.');1251          captureCommitPhaseError(nextEffect, error);1252          nextEffect = nextEffect.nextEffect;1253        }1254      }1255    } while (nextEffect !== null);1256    stopCommitLifeCyclesTimer();1257    nextEffect = null;1258    if (enableSchedulerTracing) {1259      __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);1260    }1261    workPhase = prevWorkPhase;1262  } else {1263    // No effects.1264    root.current = finishedWork;1265    // Measure these anyway so the flamegraph explicitly shows that there were1266    // no effects.1267    // TODO: Maybe there's a better way to report this.1268    startCommitSnapshotEffectsTimer();1269    stopCommitSnapshotEffectsTimer();1270    if (enableProfilerTimer) {1271      recordCommitTime();1272    }1273    startCommitHostEffectsTimer();1274    stopCommitHostEffectsTimer();1275    startCommitLifeCyclesTimer();1276    stopCommitLifeCyclesTimer();1277  }1278  stopCommitTimer();1279  if (rootDoesHavePassiveEffects) {1280    // This commit has passive effects. Stash a reference to them. But don't1281    // schedule a callback until after flushing layout work.1282    rootDoesHavePassiveEffects = false;1283    rootWithPendingPassiveEffects = root;1284    pendingPassiveEffectsExpirationTime = expirationTime;1285  } else {1286    if (enableSchedulerTracing) {1287      // If there are no passive effects, then we can complete the pending1288      // interactions. Otherwise, we'll wait until after the passive effects1289      // are flushed.1290      finishPendingInteractions(root, expirationTime);1291    }1292  }1293  // Check if there's remaining work on this root1294  const remainingExpirationTime = root.firstPendingTime;1295  if (remainingExpirationTime !== NoWork) {1296    const currentTime = requestCurrentTime();1297    const priorityLevel = inferPriorityFromExpirationTime(1298      currentTime,1299      remainingExpirationTime,1300    );1301    scheduleCallbackForRoot(root, priorityLevel, remainingExpirationTime);1302  } else {1303    // If there's no remaining work, we can clear the set of already failed1304    // error boundaries.1305    legacyErrorBoundariesThatAlreadyFailed = null;1306  }1307  onCommitRoot(finishedWork.stateNode);1308  if (remainingExpirationTime === Sync) {1309    // Count the number of times the root synchronously re-renders without1310    // finishing. If there are too many, it indicates an infinite update loop.1311    if (root === rootWithNestedUpdates) {1312      nestedUpdateCount++;1313    } else {1314      nestedUpdateCount = 0;1315      rootWithNestedUpdates = root;1316    }1317  } else {1318    nestedUpdateCount = 0;1319  }1320  if (hasUncaughtError) {1321    hasUncaughtError = false;1322    const error = firstUncaughtError;1323    firstUncaughtError = null;1324    throw error;1325  }1326  if (workPhase === LegacyUnbatchedPhase) {1327    // This is a legacy edge case. We just committed the initial mount of1328    // a ReactDOM.render-ed root inside of batchedUpdates. The commit fired1329    // synchronously, but layout updates should be deferred until the end1330    // of the batch.1331    return null;1332  }1333  // If layout work was scheduled, flush it now.1334  flushImmediateQueue();1335  return null;1336}1337function commitBeforeMutationEffects() {1338  while (nextEffect !== null) {1339    if ((nextEffect.effectTag & Snapshot) !== NoEffect) {1340      setCurrentDebugFiberInDEV(nextEffect);1341      recordEffect();1342      const current = nextEffect.alternate;1343      commitBeforeMutationEffectOnFiber(current, nextEffect);1344      resetCurrentDebugFiberInDEV();1345    }1346    nextEffect = nextEffect.nextEffect;1347  }1348}1349function commitMutationEffects() {1350  // TODO: Should probably move the bulk of this function to commitWork.1351  while (nextEffect !== null) {1352    setCurrentDebugFiberInDEV(nextEffect);1353    const effectTag = nextEffect.effectTag;1354    if (effectTag & ContentReset) {1355      commitResetTextContent(nextEffect);1356    }1357    if (effectTag & Ref) {1358      const current = nextEffect.alternate;1359      if (current !== null) {1360        commitDetachRef(current);1361      }1362    }1363    // The following switch statement is only concerned about placement,1364    // updates, and deletions. To avoid needing to add a case for every possible1365    // bitmap value, we remove the secondary effects from the effect tag and1366    // switch on that value.1367    let primaryEffectTag = effectTag & (Placement | Update | Deletion);1368    switch (primaryEffectTag) {1369      case Placement: {1370        commitPlacement(nextEffect);1371        // Clear the "placement" from effect tag so that we know that this is1372        // inserted, before any life-cycles like componentDidMount gets called.1373        // TODO: findDOMNode doesn't rely on this any more but isMounted does1374        // and isMounted is deprecated anyway so we should be able to kill this.1375        nextEffect.effectTag &= ~Placement;1376        break;1377      }1378      case PlacementAndUpdate: {1379        // Placement1380        commitPlacement(nextEffect);1381        // Clear the "placement" from effect tag so that we know that this is1382        // inserted, before any life-cycles like componentDidMount gets called.1383        nextEffect.effectTag &= ~Placement;1384        // Update1385        const current = nextEffect.alternate;1386        commitWork(current, nextEffect);1387        break;1388      }1389      case Update: {1390        const current = nextEffect.alternate;1391        commitWork(current, nextEffect);1392        break;1393      }1394      case Deletion: {1395        commitDeletion(nextEffect);1396        break;1397      }1398    }1399    // TODO: Only record a mutation effect if primaryEffectTag is non-zero.1400    recordEffect();1401    resetCurrentDebugFiberInDEV();1402    nextEffect = nextEffect.nextEffect;1403  }1404}1405function commitLayoutEffects(1406  root: FiberRoot,1407  committedExpirationTime: ExpirationTime,1408) {1409  // TODO: Should probably move the bulk of this function to commitWork.1410  while (nextEffect !== null) {1411    setCurrentDebugFiberInDEV(nextEffect);1412    const effectTag = nextEffect.effectTag;1413    if (effectTag & (Update | Callback)) {1414      recordEffect();1415      const current = nextEffect.alternate;1416      commitLayoutEffectOnFiber(1417        root,1418        current,1419        nextEffect,1420        committedExpirationTime,1421      );1422    }1423    if (effectTag & Ref) {1424      recordEffect();1425      commitAttachRef(nextEffect);1426    }1427    if (effectTag & Passive) {1428      rootDoesHavePassiveEffects = true;1429    }1430    resetCurrentDebugFiberInDEV();1431    nextEffect = nextEffect.nextEffect;1432  }1433}1434export function flushPassiveEffects() {1435  if (rootWithPendingPassiveEffects === null) {1436    return false;1437  }1438  const root = rootWithPendingPassiveEffects;1439  const expirationTime = pendingPassiveEffectsExpirationTime;1440  rootWithPendingPassiveEffects = null;1441  pendingPassiveEffectsExpirationTime = NoWork;1442  let prevInteractions: Set<Interaction> | null = null;1443  if (enableSchedulerTracing) {1444    prevInteractions = __interactionsRef.current;1445    __interactionsRef.current = root.memoizedInteractions;1446  }1447  invariant(1448    workPhase !== RenderPhase && workPhase !== CommitPhase,1449    'Cannot flush passive effects while already rendering.',1450  );1451  const prevWorkPhase = workPhase;1452  workPhase = CommitPhase;1453  // Note: This currently assumes there are no passive effects on the root1454  // fiber, because the root is not part of its own effect list. This could1455  // change in the future.1456  let effect = root.current.firstEffect;1457  while (effect !== null) {1458    if (__DEV__) {1459      setCurrentDebugFiberInDEV(effect);1460      invokeGuardedCallback(null, commitPassiveHookEffects, null, effect);1461      if (hasCaughtError()) {1462        invariant(effect !== null, 'Should be working on an effect.');1463        const error = clearCaughtError();1464        captureCommitPhaseError(effect, error);1465      }1466      resetCurrentDebugFiberInDEV();1467    } else {1468      try {1469        commitPassiveHookEffects(effect);1470      } catch (error) {1471        invariant(effect !== null, 'Should be working on an effect.');1472        captureCommitPhaseError(effect, error);1473      }1474    }1475    effect = effect.nextEffect;1476  }1477  if (enableSchedulerTracing) {1478    __interactionsRef.current = ((prevInteractions: any): Set<Interaction>);1479    finishPendingInteractions(root, expirationTime);1480  }1481  workPhase = prevWorkPhase;1482  flushImmediateQueue();1483  // If additional passive effects were scheduled, increment a counter. If this1484  // exceeds the limit, we'll fire a warning.1485  nestedPassiveUpdateCount =1486    rootWithPendingPassiveEffects === null ? 0 : nestedPassiveUpdateCount + 1;1487  return true;1488}1489export function isAlreadyFailedLegacyErrorBoundary(instance: mixed): boolean {1490  return (1491    legacyErrorBoundariesThatAlreadyFailed !== null &&1492    legacyErrorBoundariesThatAlreadyFailed.has(instance)1493  );1494}1495export function markLegacyErrorBoundaryAsFailed(instance: mixed) {1496  if (legacyErrorBoundariesThatAlreadyFailed === null) {1497    legacyErrorBoundariesThatAlreadyFailed = new Set([instance]);1498  } else {1499    legacyErrorBoundariesThatAlreadyFailed.add(instance);1500  }1501}1502function prepareToThrowUncaughtError(error: mixed) {1503  if (!hasUncaughtError) {1504    hasUncaughtError = true;1505    firstUncaughtError = error;1506  }1507}1508export const onUncaughtError = prepareToThrowUncaughtError;1509function captureCommitPhaseErrorOnRoot(1510  rootFiber: Fiber,1511  sourceFiber: Fiber,1512  error: mixed,1513) {1514  const errorInfo = createCapturedValue(error, sourceFiber);1515  const update = createRootErrorUpdate(rootFiber, errorInfo, Sync);1516  enqueueUpdate(rootFiber, update);1517  const root = markUpdateTimeFromFiberToRoot(rootFiber, Sync);1518  if (root !== null) {1519    scheduleCallbackForRoot(root, ImmediatePriority, Sync);1520  }1521}1522export function captureCommitPhaseError(sourceFiber: Fiber, error: mixed) {1523  if (sourceFiber.tag === HostRoot) {1524    // Error was thrown at the root. There is no parent, so the root1525    // itself should capture it.1526    captureCommitPhaseErrorOnRoot(sourceFiber, sourceFiber, error);1527    return;1528  }1529  let fiber = sourceFiber.return;1530  while (fiber !== null) {1531    if (fiber.tag === HostRoot) {1532      captureCommitPhaseErrorOnRoot(fiber, sourceFiber, error);1533      return;1534    } else if (fiber.tag === ClassComponent) {1535      const ctor = fiber.type;1536      const instance = fiber.stateNode;1537      if (1538        typeof ctor.getDerivedStateFromError === 'function' ||1539        (typeof instance.componentDidCatch === 'function' &&1540          !isAlreadyFailedLegacyErrorBoundary(instance))1541      ) {1542        const errorInfo = createCapturedValue(error, sourceFiber);1543        const update = createClassErrorUpdate(1544          fiber,1545          errorInfo,1546          // TODO: This is always sync1547          Sync,1548        );1549        enqueueUpdate(fiber, update);1550        const root = markUpdateTimeFromFiberToRoot(fiber, Sync);1551        if (root !== null) {1552          scheduleCallbackForRoot(root, ImmediatePriority, Sync);1553        }1554        return;1555      }1556    }1557    fiber = fiber.return;1558  }1559}1560export function pingSuspendedRoot(1561  root: FiberRoot,1562  thenable: Thenable,1563  suspendedTime: ExpirationTime,1564) {1565  const pingCache = root.pingCache;1566  if (pingCache !== null) {1567    // The thenable resolved, so we no longer need to memoize, because it will1568    // never be thrown again.1569    pingCache.delete(thenable);1570  }1571  if (workInProgressRoot === root && renderExpirationTime === suspendedTime) {1572    // Received a ping at the same priority level at which we're currently1573    // rendering. Restart from the root. Don't need to schedule a ping because1574    // we're already working on this tree.1575    prepareFreshStack(root, renderExpirationTime);1576    return;1577  }1578  const lastPendingTime = root.lastPendingTime;1579  if (lastPendingTime < suspendedTime) {1580    // The root is no longer suspended at this time.1581    return;1582  }1583  const pingTime = root.pingTime;1584  if (pingTime !== NoWork && pingTime < suspendedTime) {1585    // There's already a lower priority ping scheduled.1586    return;1587  }1588  // Mark the time at which this ping was scheduled.1589  root.pingTime = suspendedTime;1590  const currentTime = requestCurrentTime();1591  const priorityLevel = inferPriorityFromExpirationTime(1592    currentTime,1593    suspendedTime,1594  );1595  scheduleCallbackForRoot(root, priorityLevel, suspendedTime);1596}1597export function retryTimedOutBoundary(boundaryFiber: Fiber) {1598  // The boundary fiber (a Suspense component) previously timed out and was1599  // rendered in its fallback state. One of the promises that suspended it has1600  // resolved, which means at least part of the tree was likely unblocked. Try1601  // rendering again, at a new expiration time.1602  const currentTime = requestCurrentTime();1603  const retryTime = computeExpirationForFiber(currentTime, boundaryFiber);1604  // TODO: Special case idle priority?1605  const priorityLevel = inferPriorityFromExpirationTime(currentTime, retryTime);1606  const root = markUpdateTimeFromFiberToRoot(boundaryFiber, retryTime);1607  if (root !== null) {1608    scheduleCallbackForRoot(root, priorityLevel, retryTime);1609  }1610}1611export function resolveRetryThenable(boundaryFiber: Fiber, thenable: Thenable) {1612  let retryCache: WeakSet<Thenable> | Set<Thenable> | null;1613  if (enableSuspenseServerRenderer) {1614    switch (boundaryFiber.tag) {1615      case SuspenseComponent:1616        retryCache = boundaryFiber.stateNode;1617        break;1618      case DehydratedSuspenseComponent:1619        retryCache = boundaryFiber.memoizedState;1620        break;1621      default:1622        invariant(1623          false,1624          'Pinged unknown suspense boundary type. ' +1625            'This is probably a bug in React.',1626        );1627    }1628  } else {1629    retryCache = boundaryFiber.stateNode;1630  }1631  if (retryCache !== null) {1632    // The thenable resolved, so we no longer need to memoize, because it will1633    // never be thrown again.1634    retryCache.delete(thenable);1635  }1636  retryTimedOutBoundary(boundaryFiber);1637}1638export function inferStartTimeFromExpirationTime(1639  root: FiberRoot,1640  expirationTime: ExpirationTime,1641) {1642  // We don't know exactly when the update was scheduled, but we can infer an1643  // approximate start time from the expiration time.1644  const earliestExpirationTimeMs = expirationTimeToMs(root.firstPendingTime);1645  // TODO: Track this on the root instead. It's more accurate, doesn't rely on1646  // assumptions about priority, and isn't coupled to Scheduler details.1647  return earliestExpirationTimeMs - LOW_PRIORITY_EXPIRATION;1648}1649function computeMsUntilTimeout(root, absoluteTimeoutMs) {1650  if (disableYielding) {1651    // Timeout immediately when yielding is disabled.1652    return 0;1653  }1654  // Find the earliest uncommitted expiration time in the tree, including1655  // work that is suspended. The timeout threshold cannot be longer than1656  // the overall expiration.1657  const earliestExpirationTimeMs = expirationTimeToMs(root.firstPendingTime);1658  if (earliestExpirationTimeMs < absoluteTimeoutMs) {1659    absoluteTimeoutMs = earliestExpirationTimeMs;1660  }1661  // Subtract the current time from the absolute timeout to get the number1662  // of milliseconds until the timeout. In other words, convert an absolute1663  // timestamp to a relative time. This is the value that is passed1664  // to `setTimeout`.1665  let msUntilTimeout = absoluteTimeoutMs - now();1666  return msUntilTimeout < 0 ? 0 : msUntilTimeout;1667}1668function checkForNestedUpdates() {1669  if (nestedUpdateCount > NESTED_UPDATE_LIMIT) {1670    nestedUpdateCount = 0;1671    rootWithNestedUpdates = null;1672    invariant(1673      false,1674      'Maximum update depth exceeded. This can happen when a component ' +1675        'repeatedly calls setState inside componentWillUpdate or ' +1676        'componentDidUpdate. React limits the number of nested updates to ' +1677        'prevent infinite loops.',1678    );1679  }1680  if (__DEV__) {1681    if (nestedPassiveUpdateCount > NESTED_PASSIVE_UPDATE_LIMIT) {1682      nestedPassiveUpdateCount = 0;1683      warning(1684        false,1685        'Maximum update depth exceeded. This can happen when a component ' +1686          "calls setState inside useEffect, but useEffect either doesn't " +1687          'have a dependency array, or one of the dependencies changes on ' +1688          'every render.',1689      );1690    }1691  }1692}1693function flushRenderPhaseStrictModeWarningsInDEV() {1694  if (__DEV__) {1695    ReactStrictModeWarnings.flushPendingUnsafeLifecycleWarnings();1696    ReactStrictModeWarnings.flushLegacyContextWarning();1697    if (warnAboutDeprecatedLifecycles) {1698      ReactStrictModeWarnings.flushPendingDeprecationWarnings();1699    }1700  }1701}1702function stopFinishedWorkLoopTimer() {1703  const didCompleteRoot = true;1704  stopWorkLoopTimer(interruptedBy, didCompleteRoot);1705  interruptedBy = null;1706}1707function stopInterruptedWorkLoopTimer() {1708  // TODO: Track which fiber caused the interruption.1709  const didCompleteRoot = false;1710  stopWorkLoopTimer(interruptedBy, didCompleteRoot);1711  interruptedBy = null;1712}1713function checkForInterruption(1714  fiberThatReceivedUpdate: Fiber,1715  updateExpirationTime: ExpirationTime,1716) {1717  if (1718    enableUserTimingAPI &&1719    workInProgressRoot !== null &&1720    updateExpirationTime > renderExpirationTime1721  ) {1722    interruptedBy = fiberThatReceivedUpdate;1723  }1724}1725let didWarnStateUpdateForUnmountedComponent: Set<string> | null = null;1726function warnAboutUpdateOnUnmountedFiberInDEV(fiber) {1727  if (__DEV__) {1728    const tag = fiber.tag;1729    if (1730      tag !== HostRoot &&1731      tag !== ClassComponent &&1732      tag !== FunctionComponent &&1733      tag !== ForwardRef &&1734      tag !== MemoComponent &&1735      tag !== SimpleMemoComponent1736    ) {1737      // Only warn for user-defined components, not internal ones like Suspense.1738      return;1739    }1740    // We show the whole stack but dedupe on the top component's name because1741    // the problematic code almost always lies inside that component.1742    const componentName = getComponentName(fiber.type) || 'ReactComponent';1743    if (didWarnStateUpdateForUnmountedComponent !== null) {1744      if (didWarnStateUpdateForUnmountedComponent.has(componentName)) {1745        return;1746      }1747      didWarnStateUpdateForUnmountedComponent.add(componentName);1748    } else {1749      didWarnStateUpdateForUnmountedComponent = new Set([componentName]);1750    }1751    warningWithoutStack(1752      false,1753      "Can't perform a React state update on an unmounted component. This " +1754        'is a no-op, but it indicates a memory leak in your application. To ' +1755        'fix, cancel all subscriptions and asynchronous tasks in %s.%s',1756      tag === ClassComponent1757        ? 'the componentWillUnmount method'1758        : 'a useEffect cleanup function',1759      getStackByFiberInDevAndProd(fiber),1760    );1761  }1762}1763let beginWork;1764if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {1765  let dummyFiber = null;1766  beginWork = (current, unitOfWork, expirationTime) => {1767    // If a component throws an error, we replay it again in a synchronously1768    // dispatched event, so that the debugger will treat it as an uncaught1769    // error See ReactErrorUtils for more information.1770    // Before entering the begin phase, copy the work-in-progress onto a dummy1771    // fiber. If beginWork throws, we'll use this to reset the state.1772    const originalWorkInProgressCopy = assignFiberPropertiesInDEV(1773      dummyFiber,1774      unitOfWork,1775    );1776    try {1777      return originalBeginWork(current, unitOfWork, expirationTime);1778    } catch (originalError) {1779      if (1780        originalError !== null &&1781        typeof originalError === 'object' &&1782        typeof originalError.then === 'function'1783      ) {1784        // Don't replay promises. Treat everything else like an error.1785        throw originalError;1786      }1787      // Keep this code in sync with renderRoot; any changes here must have1788      // corresponding changes there.1789      resetContextDependencies();1790      resetHooks();1791      // Unwind the failed stack frame1792      unwindInterruptedWork(unitOfWork);1793      // Restore the original properties of the fiber.1794      assignFiberPropertiesInDEV(unitOfWork, originalWorkInProgressCopy);1795      if (enableProfilerTimer && unitOfWork.mode & ProfileMode) {1796        // Reset the profiler timer.1797        startProfilerTimer(unitOfWork);1798      }1799      // Run beginWork again.1800      invokeGuardedCallback(1801        null,1802        originalBeginWork,1803        null,...

ReactFiberWorkLoop.js

Source:ReactFiberWorkLoop.js

...619    } catch (thrownValue) {620      // handleError(root, thrownValue);621    }622  } while (true);623  resetContextDependencies();624  executionContext = prevExecutionContext;625  popDispatcher(prevDispatcher);626  if (workInProgress !== null) {627    invariant(628      false,629      'Cannot commit an incomplete root. This error is likely caused by a ' +630        'bug in React. Please file an issue.'631    );632  }633  workInProgressRoot = null;634  workInProgressRootRenderLanes = NoLanes;635  return workInProgressRootExitStatus;636};637const ensureRootIsScheduled = (root, currentTime) => {...

ReactFiberNewContext.new.js

Source:ReactFiberNewContext.new.js

...40let currentlyRenderingFiber: Fiber | null = null;41let lastContextDependency: ContextDependency<mixed> | null = null;42let lastContextWithAllBitsObserved: ReactContext<any> | null = null;43let isDisallowedContextReadInDEV: boolean = false;44export function resetContextDependencies(): void {45  // This is called right before React yields execution, to ensure `readContext`46  // cannot be called outside the render phase.47  currentlyRenderingFiber = null;48  lastContextDependency = null;49  lastContextWithAllBitsObserved = null;50  if (__DEV__) {51    isDisallowedContextReadInDEV = false;52  }53}54export function enterDisallowedContextReadInDEV(): void {55  if (__DEV__) {56    isDisallowedContextReadInDEV = true;57  }58}...

ReactFiberNewContext.old.js

Source:ReactFiberNewContext.old.js

...7  var currentlyRenderingFiber = null;8  var lastContextDependency = null;9  var lastContextWithAllBitsObserved = null;10  var isDisallowedContextReadInDEV = false;11  function resetContextDependencies() {12    // This is called right before React yields execution, to ensure `readContext`13    // cannot be called outside the render phase.14    currentlyRenderingFiber = null;15    lastContextDependency = null;16    lastContextWithAllBitsObserved = null;17    {18      isDisallowedContextReadInDEV = false;19    }20  }21  function enterDisallowedContextReadInDEV() {22    {23      isDisallowedContextReadInDEV = true;24    }25  }...

ReactFiberNewContext.js

Source:ReactFiberNewContext.js

1import { includesSomeLane, NoLanes } from './ReactFiberLane';2import { markWorkInProgressReceivedUpdate } from './ReactFiberBeginWork';3const invariant = require('invariant');4const MAX_SIGNED_31_BIT_INT = 1073741823;5let currentlyRenderingFiber = null;6let lastContextDependency = null;7let lastContextWithAllBitsObserved = null;8const resetContextDependencies = () => {9  currentlyRenderingFiber = null;10  lastContextDependency = null;11  lastContextWithAllBitsObserved = null;12};13const prepareToReadContext = (workInProgress, renderLanes) => {14  currentlyRenderingFiber = workInProgress;15  lastContextDependency = null;16  lastContextWithAllBitsObserved = null;17  const dependencies = workInProgress.dependencies;18  if (dependencies !== null) {19    const firstContext = dependencies.firstContext;20    if (firstContext !== null) {21      if (includesSomeLane(dependencies.lanes, renderLanes)) {22        markWorkInProgressReceivedUpdate();23      }24      dependencies.firstContext = null;25    }26  }27};28const readContext = (context, observedBits) => {29  if (lastContextWithAllBitsObserved === context) {30    // Nothing to do. We already observe everything in this context.31  } else if (observedBits === false || observedBits === 0) {32    // Do not observe any updates.33  } else {34    let resolvedObservedBits;35    if (36      typeof observedBits !== 'number' ||37      observedBits === MAX_SIGNED_31_BIT_INT38    ) {39      lastContextWithAllBitsObserved = context;40      resolvedObservedBits = MAX_SIGNED_31_BIT_INT;41    } else {42      resolvedObservedBits = observedBits;43    }44    const contextItem = {45      context: context,46      observedBits: resolvedObservedBits,47      next: null,48    };49    if (lastContextDependency === null) {50      invariant(51        currentlyRenderingFiber !== null,52        'Context can only be read while React is rendering. ' +53          'In classes, you can read it in the render method or getDerivedStateFromProps. ' +54          'In function components, you can read it directly in the function body, but not ' +55          'inside Hooks like useReducer() or useMemo().'56      );57      lastContextDependency = contextItem;58      currentlyRenderingFiber.dependencies = {59        lanes: NoLanes,60        firstContext: contextItem,61        responders: null,62      };63    } else {64      lastContextDependency = lastContextDependency.next = contextItem;65    }66  }67  return context._currentValue;68};...

Using AI Code Generation

1const { resetContextDependencies } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  await resetContextDependencies(context);7  await context.close();8  await browser.close();9})();10const { chromium } = require('playwright');11(async () => {12  const browser = await chromium.launch();13  const context = await browser.newContext();14  await context.close();15  await browser.close();16})();17    at Object.throwProtocolError (/Users/kritikaparmar/Desktop/playwright-test/node_modules/playwright/lib/server/cjs/transport.js:285:15)18    at CDPSession.dispatch (/Users/kritikaparmar/Desktop/playwright-test/node_modules/playwright/lib/server/cjs/transport.js:181:23)19    at CDPSession._onMessage (/Users/kritikaparmar/Desktop/playwright-test/node_modules/playwright/lib/server/cjs/transport.js:132:16)20    at WebSocketTransport._ws.addEventListener (/Users/kritikaparmar/Desktop/playwright-test/node_modules/playwright/lib/server/cjs/transport.js:42:24)21    at WebSocket.onMessage (/Users/kritikaparmar/Desktop/playwright-test/node_modules/ws/lib/event-target.js:132:16)22    at WebSocket.emit (events.js:315:20)23    at Receiver.receiverOnMessage (/Users/kritikaparmar/Desktop/playwright-test/node_modules/ws/lib/websocket.js:800:20)24    at Receiver.emit (events.js:315:20)25    at Receiver.dataMessage (/Users/kritikaparmar/Desktop/playwright-test/node_modules/ws/lib/receiver.js:437:14)26    at Receiver.getData (/Users/kritikaparmar/Desktop/playwright-test/node_modules/ws/lib/receiver.js:367:17)

Using AI Code Generation

1const { resetContextDependencies } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  await resetContextDependencies(context);7  await context.close();8  await browser.close();9})();10const { chromium } = require('playwright');11const { resetContextDependencies } = require('playwright/lib/server/browserContext');12describe('My test', () => {13  let browser;14  let context;15  beforeEach(async () => {16    browser = await chromium.launch();17    context = await browser.newContext();18  });19  afterEach(async () => {20    await resetContextDependencies(context);21    await context.close();22    await browser.close();23  });24  it('should work', async () => {25    const page = await context.newPage();26    await page.screenshot({ path: 'playwright.png' });27  });28});

Using AI Code Generation

1const { resetContextDependencies } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch({ headless: false });5  const context = await browser.newContext();6  await resetContextDependencies(context);7  await browser.close();8})();9const { resetContextDependencies } = require('playwright/lib/server/browserContext');10const { chromium } = require('playwright');11(async () => {12  const browser = await chromium.launch({ headless: false });13  const context = await browser.newContext();14  await resetContextDependencies(context);15  await browser.close();16})();17const { resetContextDependencies } = require('playwright/lib/server/browserContext');18const { chromium } = require('playwright');19(async () => {20  const browser = await chromium.launch({ headless: false });21  const context = await browser.newContext();22  await resetContextDependencies(context);23  await browser.close();24})();25const { resetContextDependencies } = require('playwright/lib/server/browserContext');26const { chromium } = require('playwright');27(async () => {28  const browser = await chromium.launch({ headless: false });29  const context = await browser.newContext();30  await resetContextDependencies(context);31  await browser.close();32})();33const { resetContextDependencies } = require('playwright/lib/server/browserContext');34const { chromium } = require('playwright');35(async () => {36  const browser = await chromium.launch({ headless: false });37  const context = await browser.newContext();38  await resetContextDependencies(context);39  await browser.close();40})();41const { resetContextDependencies } = require('playwright/lib/server/browserContext');42const { chromium } = require('playwright');43(async () => {44  const browser = await chromium.launch({ headless: false });45  const context = await browser.newContext();46  await resetContextDependencies(context);47  await browser.close();48})();

Using AI Code Generation

1const { resetContextDependencies } = require('playwright-core/lib/server/browserContext');2resetContextDependencies();3const { resetBrowserDependencies } = require('playwright-core/lib/server/browser');4resetBrowserDependencies();5const { resetBrowserTypeDependencies } = require('playwright-core/lib/server/browserType');6resetBrowserTypeDependencies();7const { resetServerDependencies } = require('playwright-core/lib/server/server');8resetServerDependencies();9const { resetTestState } = require('playwright-core/lib/test/test');10resetTestState();11const { resetTestTypeDependencies } = require('playwright-core/lib/test/testType');12resetTestTypeDependencies();13const { resetTraceModel } = require('playwright-core/lib/trace/traceModel');14resetTraceModel();15const { resetTracePlayer } = require('playwright-core/lib/trace/tracePlayer');16resetTracePlayer();17const { resetTraceRecorder } = require('playwright-core/lib/trace/traceRecorder');18resetTraceRecorder();19const { resetTransport } = require('playwright-core/lib/transport/transport');20resetTransport();21const { resetWebSocketTransport } = require('playwright-core/lib/transport/webSocketTransport');22resetWebSocketTransport();23const { resetBrowserServer } = require('playwright-core/lib/server/browserServer');24resetBrowserServer();25const { resetBrowserContext } = require('playwright-core/lib/server/browserContext');26resetBrowserContext();27const { resetBrowserType } = require('playwright-core/lib/server/browserType');28resetBrowserType();

Using AI Code Generation

1const { resetContextDependencies } = require("playwright/lib/server/chromium/crBrowser");2resetContextDependencies();3const { resetContextDependencies } = require("playwright/lib/server/firefox/ffBrowser");4resetContextDependencies();5const { resetContextDependencies } = require("playwright/lib/server/webkit/wkBrowser");6resetContextDependencies();7const { resetContextDependencies } = require("playwright/lib/server/chromium/crBrowser");8resetContextDependencies();9const { resetContextDependencies } = require("playwright/lib/server/firefox/ffBrowser");10resetContextDependencies();11const { resetContextDependencies } = require("playwright/lib/server/webkit/wkBrowser");12resetContextDependencies();13const { resetContextDependencies } = require("playwright/lib/server/chromium/crBrowser");14resetContextDependencies();15const { resetContextDependencies } = require("playwright/lib/server/firefox/ffBrowser");16resetContextDependencies();17const { resetContextDependencies } = require("playwright/lib/server/webkit/wkBrowser");18resetContextDependencies();19const { resetContextDependencies } = require("playwright/lib/server/chromium/crBrowser");20resetContextDependencies();21const { resetContextDependencies } = require("playwright/lib/server/firefox/ffBrowser");22resetContextDependencies();23const { resetContextDependencies } = require("playwright/lib/server/webkit/wkBrowser");24resetContextDependencies();25const { resetContextDependencies } = require("playwright/lib/server/chromium/crBrowser");26resetContextDependencies();27const { resetContextDependencies } = require("playwright/lib/server/firefox/

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  await browser._defaultContext.resetContextDependencies();5  await browser.close();6})();7const playwright = require('playwright');8(async () => {9  const browser = await playwright.chromium.launch();10  await browser._defaultContext.resetContextDependencies();11  await browser.close();12})();13const playwright = require('playwright');14(async () => {15  const browser = await playwright.chromium.launch();16  await browser._defaultContext.resetContextDependencies();17  await browser.close();18})();19const playwright = require('playwright');20(async () => {21  const browser = await playwright.chromium.launch();22  await browser._defaultContext.resetContextDependencies();23  await browser.close();24})();25const playwright = require('playwright');26(async () => {27  const browser = await playwright.chromium.launch();28  await browser._defaultContext.resetContextDependencies();29  await browser.close();30})();31const playwright = require('playwright');32(async () => {33  const browser = await playwright.chromium.launch();34  await browser._defaultContext.resetContextDependencies();35  await browser.close();36})();37const playwright = require('playwright');38(async () => {39  const browser = await playwright.chromium.launch();40  await browser._defaultContext.resetContextDependencies();41  await browser.close();42})();43const playwright = require('playwright');44(async () => {45  const browser = await playwright.chromium.launch();46  await browser._defaultContext.resetContextDependencies();47  await browser.close();48})();49const playwright = require('playwright');50(async () => {51  const browser = await playwright.chromium.launch();52  await browser._defaultContext.resetContextDependencies();53  await browser.close();54})();55const playwright = require('

Using AI Code Generation

1const { resetContextDependencies } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3const context = await chromium.launchPersistentContext('./data');4await resetContextDependencies(context);5await context.close();6await context.clearCookies();7await context.clearPermissions();8await context.clearStorageData();9await context.tracing.start({ screenshots: true, snapshots: true });10await context.tracing.stop({ path: 'trace.zip' });11await context.tracing.startChunk();12await context.tracing.stopChunk({ path: 'trace.zip' });13await context.addCookies([{14}]);15const cookies = await context.cookies();16console.log(cookies);17await context.grantPermissions(['geolocation']);18const permissions = await context.permissions();19console.log(permissions);20await context.setGeolocation({ latitude: 59.95, longitude: 30.31667 });21await context.setExtraHTTPHeaders({ foo: 'bar' });22await context.setOffline(true);23await context.setHTTPCredentials({ username: 'user', password: 'pass' });24await context.addInitScript({ path: 'inject.js' });25await context.addInitScript({ content: 'window.injected = 123;' });26await context.exposeBinding('compute', (source, ...args) => {27  return args.reduce((a, b) => a * b, 1);28});29await context.exposeFunction('compute', (...args) => {30  return args.reduce((a, b) => a * b, 1);31});32await context.route('**/*', route => route.continue());33await context.unroute('**/*');34await context.waitForEvent('page');35const page = await context.newPage();36await context.close();37await context.clearCookies();38await context.clearPermissions();39await context.clearStorageData();40await context.tracing.start({ screenshots: true, snapshots: true });41await context.tracing.stop({ path: 'trace.zip' });42await context.tracing.startChunk();43await context.tracing.stopChunk({ path: 'trace.zip' });44await context.addCookies([{

Using AI Code Generation

1const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");2resetContextDependencies();3const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");4resetContextDependencies();5const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");6resetContextDependencies();7const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");8resetContextDependencies();9const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");10resetContextDependencies();11const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");12resetContextDependencies();13const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");14resetContextDependencies();15const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");16resetContextDependencies();17const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");18resetContextDependencies();19const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");20resetContextDependencies();21const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");22resetContextDependencies();23const { resetContextDependencies } = require("@playwright/test/lib/server/trace/recorder/dependencies");24resetContextDependencies();

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:

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.
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.
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.
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.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
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.
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.
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.
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.
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.
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.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.