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How to use getNextLanes method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberWorkLoop.new.js

Source:ReactFiberWorkLoop.new.js

...629  // Check if any lanes are being starved by other work. If so, mark them as630  // expired so we know to work on those next.631  markStarvedLanesAsExpired(root, currentTime);632  // Determine the next lanes to work on, and their priority.633  const nextLanes = getNextLanes(634    root,635    root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes,636  );637  // This returns the priority level computed during the `getNextLanes` call.638  const newCallbackPriority = returnNextLanesPriority();639  if (nextLanes === NoLanes) {640    // Special case: There's nothing to work on.641    if (existingCallbackNode !== null) {642      cancelCallback(existingCallbackNode);643      root.callbackNode = null;644      root.callbackPriority = NoLanePriority;645    }646    return;647  }648  // Check if there's an existing task. We may be able to reuse it.649  if (existingCallbackNode !== null) {650    const existingCallbackPriority = root.callbackPriority;651    if (existingCallbackPriority === newCallbackPriority) {652      // The priority hasn't changed. We can reuse the existing task. Exit.653      return;654    }655    // The priority changed. Cancel the existing callback. We'll schedule a new656    // one below.657    cancelCallback(existingCallbackNode);658  }659  // Schedule a new callback.660  let newCallbackNode;661  if (newCallbackPriority === SyncLanePriority) {662    // Special case: Sync React callbacks are scheduled on a special663    // internal queue664    newCallbackNode = scheduleSyncCallback(665      performSyncWorkOnRoot.bind(null, root),666    );667  } else if (newCallbackPriority === SyncBatchedLanePriority) {668    newCallbackNode = scheduleCallback(669      ImmediateSchedulerPriority,670      performSyncWorkOnRoot.bind(null, root),671    );672  } else {673    const schedulerPriorityLevel = lanePriorityToSchedulerPriority(674      newCallbackPriority,675    );676    newCallbackNode = scheduleCallback(677      schedulerPriorityLevel,678      performConcurrentWorkOnRoot.bind(null, root),679    );680  }681  root.callbackPriority = newCallbackPriority;682  root.callbackNode = newCallbackNode;683}684// This is the entry point for every concurrent task, i.e. anything that685// goes through Scheduler.686function performConcurrentWorkOnRoot(root) {687  // Since we know we're in a React event, we can clear the current688  // event time. The next update will compute a new event time.689  currentEventTime = NoTimestamp;690  currentEventWipLanes = NoLanes;691  currentEventPendingLanes = NoLanes;692  invariant(693    (executionContext & (RenderContext | CommitContext)) === NoContext,694    'Should not already be working.',695  );696  // Flush any pending passive effects before deciding which lanes to work on,697  // in case they schedule additional work.698  const originalCallbackNode = root.callbackNode;699  const didFlushPassiveEffects = flushPassiveEffects();700  if (didFlushPassiveEffects) {701    // Something in the passive effect phase may have canceled the current task.702    // Check if the task node for this root was changed.703    if (root.callbackNode !== originalCallbackNode) {704      // The current task was canceled. Exit. We don't need to call705      // `ensureRootIsScheduled` because the check above implies either that706      // there's a new task, or that there's no remaining work on this root.707      return null;708    } else {709      // Current task was not canceled. Continue.710    }711  }712  // Determine the next expiration time to work on, using the fields stored713  // on the root.714  let lanes = getNextLanes(715    root,716    root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes,717  );718  if (lanes === NoLanes) {719    // Defensive coding. This is never expected to happen.720    return null;721  }722  let exitStatus = renderRootConcurrent(root, lanes);723  if (724    includesSomeLane(725      workInProgressRootIncludedLanes,726      workInProgressRootUpdatedLanes,727    )728  ) {729    // The render included lanes that were updated during the render phase.730    // For example, when unhiding a hidden tree, we include all the lanes731    // that were previously skipped when the tree was hidden. That set of732    // lanes is a superset of the lanes we started rendering with.733    //734    // So we'll throw out the current work and restart.735    prepareFreshStack(root, NoLanes);736  } else if (exitStatus !== RootIncomplete) {737    if (exitStatus === RootErrored) {738      executionContext |= RetryAfterError;739      // If an error occurred during hydration,740      // discard server response and fall back to client side render.741      if (root.hydrate) {742        root.hydrate = false;743        clearContainer(root.containerInfo);744      }745      // If something threw an error, try rendering one more time. We'll render746      // synchronously to block concurrent data mutations, and we'll includes747      // all pending updates are included. If it still fails after the second748      // attempt, we'll give up and commit the resulting tree.749      lanes = getLanesToRetrySynchronouslyOnError(root);750      if (lanes !== NoLanes) {751        exitStatus = renderRootSync(root, lanes);752      }753    }754    if (exitStatus === RootFatalErrored) {755      const fatalError = workInProgressRootFatalError;756      prepareFreshStack(root, NoLanes);757      markRootSuspended(root, lanes);758      ensureRootIsScheduled(root, now());759      throw fatalError;760    }761    // We now have a consistent tree. The next step is either to commit it,762    // or, if something suspended, wait to commit it after a timeout.763    const finishedWork: Fiber = (root.current.alternate: any);764    root.finishedWork = finishedWork;765    root.finishedLanes = lanes;766    finishConcurrentRender(root, exitStatus, lanes);767  }768  ensureRootIsScheduled(root, now());769  if (root.callbackNode === originalCallbackNode) {770    // The task node scheduled for this root is the same one that's771    // currently executed. Need to return a continuation.772    return performConcurrentWorkOnRoot.bind(null, root);773  }774  return null;775}776function finishConcurrentRender(root, exitStatus, lanes) {777  switch (exitStatus) {778    case RootIncomplete:779    case RootFatalErrored: {780      invariant(false, 'Root did not complete. This is a bug in React.');781    }782    // Flow knows about invariant, so it complains if I add a break783    // statement, but eslint doesn't know about invariant, so it complains784    // if I do. eslint-disable-next-line no-fallthrough785    case RootErrored: {786      // We should have already attempted to retry this tree. If we reached787      // this point, it errored again. Commit it.788      commitRoot(root);789      break;790    }791    case RootSuspended: {792      markRootSuspended(root, lanes);793      // We have an acceptable loading state. We need to figure out if we794      // should immediately commit it or wait a bit.795      if (796        includesOnlyRetries(lanes) &&797        // do not delay if we're inside an act() scope798        !shouldForceFlushFallbacksInDEV()799      ) {800        // This render only included retries, no updates. Throttle committing801        // retries so that we don't show too many loading states too quickly.802        const msUntilTimeout =803          globalMostRecentFallbackTime + FALLBACK_THROTTLE_MS - now();804        // Don't bother with a very short suspense time.805        if (msUntilTimeout > 10) {806          const nextLanes = getNextLanes(root, NoLanes);807          if (nextLanes !== NoLanes) {808            // There's additional work on this root.809            break;810          }811          const suspendedLanes = root.suspendedLanes;812          if (!isSubsetOfLanes(suspendedLanes, lanes)) {813            // We should prefer to render the fallback of at the last814            // suspended level. Ping the last suspended level to try815            // rendering it again.816            // FIXME: What if the suspended lanes are Idle? Should not restart.817            const eventTime = requestEventTime();818            markRootPinged(root, suspendedLanes, eventTime);819            break;820          }821          // The render is suspended, it hasn't timed out, and there's no822          // lower priority work to do. Instead of committing the fallback823          // immediately, wait for more data to arrive.824          root.timeoutHandle = scheduleTimeout(825            commitRoot.bind(null, root),826            msUntilTimeout,827          );828          break;829        }830      }831      // The work expired. Commit immediately.832      commitRoot(root);833      break;834    }835    case RootSuspendedWithDelay: {836      markRootSuspended(root, lanes);837      if (includesOnlyTransitions(lanes)) {838        // This is a transition, so we should exit without committing a839        // placeholder and without scheduling a timeout. Delay indefinitely840        // until we receive more data.841        break;842      }843      if (!shouldForceFlushFallbacksInDEV()) {844        // This is not a transition, but we did trigger an avoided state.845        // Schedule a placeholder to display after a short delay, using the Just846        // Noticeable Difference.847        // TODO: Is the JND optimization worth the added complexity? If this is848        // the only reason we track the event time, then probably not.849        // Consider removing.850        const mostRecentEventTime = getMostRecentEventTime(root, lanes);851        const eventTimeMs = mostRecentEventTime;852        const timeElapsedMs = now() - eventTimeMs;853        const msUntilTimeout = jnd(timeElapsedMs) - timeElapsedMs;854        // Don't bother with a very short suspense time.855        if (msUntilTimeout > 10) {856          // Instead of committing the fallback immediately, wait for more data857          // to arrive.858          root.timeoutHandle = scheduleTimeout(859            commitRoot.bind(null, root),860            msUntilTimeout,861          );862          break;863        }864      }865      // Commit the placeholder.866      commitRoot(root);867      break;868    }869    case RootCompleted: {870      // The work completed. Ready to commit.871      commitRoot(root);872      break;873    }874    default: {875      invariant(false, 'Unknown root exit status.');876    }877  }878}879function markRootSuspended(root, suspendedLanes) {880  // When suspending, we should always exclude lanes that were pinged or (more881  // rarely, since we try to avoid it) updated during the render phase.882  // TODO: Lol maybe there's a better way to factor this besides this883  // obnoxiously named function :)884  suspendedLanes = removeLanes(suspendedLanes, workInProgressRootPingedLanes);885  suspendedLanes = removeLanes(suspendedLanes, workInProgressRootUpdatedLanes);886  markRootSuspended_dontCallThisOneDirectly(root, suspendedLanes);887}888// This is the entry point for synchronous tasks that don't go889// through Scheduler890function performSyncWorkOnRoot(root) {891  invariant(892    (executionContext & (RenderContext | CommitContext)) === NoContext,893    'Should not already be working.',894  );895  flushPassiveEffects();896  let lanes;897  let exitStatus;898  if (899    root === workInProgressRoot &&900    includesSomeLane(root.expiredLanes, workInProgressRootRenderLanes)901  ) {902    // There's a partial tree, and at least one of its lanes has expired. Finish903    // rendering it before rendering the rest of the expired work.904    lanes = workInProgressRootRenderLanes;905    exitStatus = renderRootSync(root, lanes);906    if (907      includesSomeLane(908        workInProgressRootIncludedLanes,909        workInProgressRootUpdatedLanes,910      )911    ) {912      // The render included lanes that were updated during the render phase.913      // For example, when unhiding a hidden tree, we include all the lanes914      // that were previously skipped when the tree was hidden. That set of915      // lanes is a superset of the lanes we started rendering with.916      //917      // Note that this only happens when part of the tree is rendered918      // concurrently. If the whole tree is rendered synchronously, then there919      // are no interleaved events.920      lanes = getNextLanes(root, lanes);921      exitStatus = renderRootSync(root, lanes);922    }923  } else {924    lanes = getNextLanes(root, NoLanes);925    exitStatus = renderRootSync(root, lanes);926  }927  if (root.tag !== LegacyRoot && exitStatus === RootErrored) {928    executionContext |= RetryAfterError;929    // If an error occurred during hydration,930    // discard server response and fall back to client side render.931    if (root.hydrate) {932      root.hydrate = false;933      clearContainer(root.containerInfo);934    }935    // If something threw an error, try rendering one more time. We'll render936    // synchronously to block concurrent data mutations, and we'll includes937    // all pending updates are included. If it still fails after the second938    // attempt, we'll give up and commit the resulting tree....

ReactFiberWorkLoop.old.js

Source:ReactFiberWorkLoop.old.js

...298  function ensureRootIsScheduled(root, currentTime) {299    var existingCallbackNode = root.callbackNode; // Check if any lanes are being starved by other work. If so, mark them as300    // expired so we know to work on those next.301    markStarvedLanesAsExpired(root, currentTime); // Determine the next lanes to work on, and their priority.302    var nextLanes = getNextLanes(root, root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes); // This returns the priority level computed during the `getNextLanes` call.303    var newCallbackPriority = returnNextLanesPriority();304    if (nextLanes === NoLanes) {305      // Special case: There's nothing to work on.306      if (existingCallbackNode !== null) {307        cancelCallback(existingCallbackNode);308        root.callbackNode = null;309        root.callbackPriority = NoLanePriority;310      }311      return;312    } // Check if there's an existing task. We may be able to reuse it.313    if (existingCallbackNode !== null) {314      var existingCallbackPriority = root.callbackPriority;315      if (existingCallbackPriority === newCallbackPriority) {316        // The priority hasn't changed. We can reuse the existing task. Exit.317        return;318      } // The priority changed. Cancel the existing callback. We'll schedule a new319      // one below.320      cancelCallback(existingCallbackNode);321    } // Schedule a new callback.322    var newCallbackNode;323    if (newCallbackPriority === SyncLanePriority) {324      // Special case: Sync React callbacks are scheduled on a special325      // internal queue326      newCallbackNode = scheduleSyncCallback(performSyncWorkOnRoot.bind(null, root));327    } else if (newCallbackPriority === SyncBatchedLanePriority) {328      newCallbackNode = scheduleCallback(ImmediatePriority$1, performSyncWorkOnRoot.bind(null, root));329    } else {330      var schedulerPriorityLevel = lanePriorityToSchedulerPriority(newCallbackPriority);331      newCallbackNode = scheduleCallback(schedulerPriorityLevel, performConcurrentWorkOnRoot.bind(null, root));332    }333    root.callbackPriority = newCallbackPriority;334    root.callbackNode = newCallbackNode;335  } // This is the entry point for every concurrent task, i.e. anything that336  // goes through Scheduler.337  function performConcurrentWorkOnRoot(root) {338    // Since we know we're in a React event, we can clear the current339    // event time. The next update will compute a new event time.340    currentEventTime = NoTimestamp;341    currentEventWipLanes = NoLanes;342    currentEventPendingLanes = NoLanes;343    if (!((executionContext & (RenderContext | CommitContext)) === NoContext)) {344      {345        throw Error( "Should not already be working." );346      }347    } // Flush any pending passive effects before deciding which lanes to work on,348    // in case they schedule additional work.349    var originalCallbackNode = root.callbackNode;350    var didFlushPassiveEffects = flushPassiveEffects();351    if (didFlushPassiveEffects) {352      // Something in the passive effect phase may have canceled the current task.353      // Check if the task node for this root was changed.354      if (root.callbackNode !== originalCallbackNode) {355        // The current task was canceled. Exit. We don't need to call356        // `ensureRootIsScheduled` because the check above implies either that357        // there's a new task, or that there's no remaining work on this root.358        return null;359      }360    } // Determine the next expiration time to work on, using the fields stored361    // on the root.362    var lanes = getNextLanes(root, root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes);363    if (lanes === NoLanes) {364      // Defensive coding. This is never expected to happen.365      return null;366    }367    var exitStatus = renderRootConcurrent(root, lanes);368    if (includesSomeLane(workInProgressRootIncludedLanes, workInProgressRootUpdatedLanes)) {369      // The render included lanes that were updated during the render phase.370      // For example, when unhiding a hidden tree, we include all the lanes371      // that were previously skipped when the tree was hidden. That set of372      // lanes is a superset of the lanes we started rendering with.373      //374      // So we'll throw out the current work and restart.375      prepareFreshStack(root, NoLanes);376    } else if (exitStatus !== RootIncomplete) {377      if (exitStatus === RootErrored) {378        executionContext |= RetryAfterError; // If an error occurred during hydration,379        // discard server response and fall back to client side render.380        if (root.hydrate) {381          root.hydrate = false;382          clearContainer(root.containerInfo);383        } // If something threw an error, try rendering one more time. We'll render384        // synchronously to block concurrent data mutations, and we'll includes385        // all pending updates are included. If it still fails after the second386        // attempt, we'll give up and commit the resulting tree.387        lanes = getLanesToRetrySynchronouslyOnError(root);388        if (lanes !== NoLanes) {389          exitStatus = renderRootSync(root, lanes);390        }391      }392      if (exitStatus === RootFatalErrored) {393        var fatalError = workInProgressRootFatalError;394        prepareFreshStack(root, NoLanes);395        markRootSuspended$1(root, lanes);396        ensureRootIsScheduled(root, now());397        throw fatalError;398      } // We now have a consistent tree. The next step is either to commit it,399      // or, if something suspended, wait to commit it after a timeout.400      var finishedWork = root.current.alternate;401      root.finishedWork = finishedWork;402      root.finishedLanes = lanes;403      finishConcurrentRender(root, exitStatus, lanes);404    }405    ensureRootIsScheduled(root, now());406    if (root.callbackNode === originalCallbackNode) {407      // The task node scheduled for this root is the same one that's408      // currently executed. Need to return a continuation.409      return performConcurrentWorkOnRoot.bind(null, root);410    }411    return null;412  }413  function finishConcurrentRender(root, exitStatus, lanes) {414    switch (exitStatus) {415      case RootIncomplete:416      case RootFatalErrored:417        {418          {419            {420              throw Error( "Root did not complete. This is a bug in React." );421            }422          }423        }424      // Flow knows about invariant, so it complains if I add a break425      // statement, but eslint doesn't know about invariant, so it complains426      // if I do. eslint-disable-next-line no-fallthrough427      case RootErrored:428        {429          // We should have already attempted to retry this tree. If we reached430          // this point, it errored again. Commit it.431          commitRoot(root);432          break;433        }434      case RootSuspended:435        {436          markRootSuspended$1(root, lanes); // We have an acceptable loading state. We need to figure out if we437          // should immediately commit it or wait a bit.438          if (includesOnlyRetries(lanes) && // do not delay if we're inside an act() scope439          !shouldForceFlushFallbacksInDEV()) {440            // This render only included retries, no updates. Throttle committing441            // retries so that we don't show too many loading states too quickly.442            var msUntilTimeout = globalMostRecentFallbackTime + FALLBACK_THROTTLE_MS - now(); // Don't bother with a very short suspense time.443            if (msUntilTimeout > 10) {444              var nextLanes = getNextLanes(root, NoLanes);445              if (nextLanes !== NoLanes) {446                // There's additional work on this root.447                break;448              }449              var suspendedLanes = root.suspendedLanes;450              if (!isSubsetOfLanes(suspendedLanes, lanes)) {451                // We should prefer to render the fallback of at the last452                // suspended level. Ping the last suspended level to try453                // rendering it again.454                // FIXME: What if the suspended lanes are Idle? Should not restart.455                var eventTime = requestEventTime();456                markRootPinged(root, suspendedLanes);457                break;458              } // The render is suspended, it hasn't timed out, and there's no459              // lower priority work to do. Instead of committing the fallback460              // immediately, wait for more data to arrive.461              root.timeoutHandle = scheduleTimeout(commitRoot.bind(null, root), msUntilTimeout);462              break;463            }464          } // The work expired. Commit immediately.465          commitRoot(root);466          break;467        }468      case RootSuspendedWithDelay:469        {470          markRootSuspended$1(root, lanes);471          if (includesOnlyTransitions(lanes)) {472            // This is a transition, so we should exit without committing a473            // placeholder and without scheduling a timeout. Delay indefinitely474            // until we receive more data.475            break;476          }477          if (!shouldForceFlushFallbacksInDEV()) {478            // This is not a transition, but we did trigger an avoided state.479            // Schedule a placeholder to display after a short delay, using the Just480            // Noticeable Difference.481            // TODO: Is the JND optimization worth the added complexity? If this is482            // the only reason we track the event time, then probably not.483            // Consider removing.484            var mostRecentEventTime = getMostRecentEventTime(root, lanes);485            var eventTimeMs = mostRecentEventTime;486            var timeElapsedMs = now() - eventTimeMs;487            var _msUntilTimeout = jnd(timeElapsedMs) - timeElapsedMs; // Don't bother with a very short suspense time.488            if (_msUntilTimeout > 10) {489              // Instead of committing the fallback immediately, wait for more data490              // to arrive.491              root.timeoutHandle = scheduleTimeout(commitRoot.bind(null, root), _msUntilTimeout);492              break;493            }494          } // Commit the placeholder.495          commitRoot(root);496          break;497        }498      case RootCompleted:499        {500          // The work completed. Ready to commit.501          commitRoot(root);502          break;503        }504      default:505        {506          {507            {508              throw Error( "Unknown root exit status." );509            }510          }511        }512    }513  }514  function markRootSuspended$1(root, suspendedLanes) {515    // When suspending, we should always exclude lanes that were pinged or (more516    // rarely, since we try to avoid it) updated during the render phase.517    // TODO: Lol maybe there's a better way to factor this besides this518    // obnoxiously named function :)519    suspendedLanes = removeLanes(suspendedLanes, workInProgressRootPingedLanes);520    suspendedLanes = removeLanes(suspendedLanes, workInProgressRootUpdatedLanes);521    markRootSuspended(root, suspendedLanes);522  } // This is the entry point for synchronous tasks that don't go523  // through Scheduler524  function performSyncWorkOnRoot(root) {525    if (!((executionContext & (RenderContext | CommitContext)) === NoContext)) {526      {527        throw Error( "Should not already be working." );528      }529    }530    flushPassiveEffects();531    var lanes;532    var exitStatus;533    if (root === workInProgressRoot && includesSomeLane(root.expiredLanes, workInProgressRootRenderLanes)) {534      // There's a partial tree, and at least one of its lanes has expired. Finish535      // rendering it before rendering the rest of the expired work.536      lanes = workInProgressRootRenderLanes;537      exitStatus = renderRootSync(root, lanes);538      if (includesSomeLane(workInProgressRootIncludedLanes, workInProgressRootUpdatedLanes)) {539        // The render included lanes that were updated during the render phase.540        // For example, when unhiding a hidden tree, we include all the lanes541        // that were previously skipped when the tree was hidden. That set of542        // lanes is a superset of the lanes we started rendering with.543        //544        // Note that this only happens when part of the tree is rendered545        // concurrently. If the whole tree is rendered synchronously, then there546        // are no interleaved events.547        lanes = getNextLanes(root, lanes);548        exitStatus = renderRootSync(root, lanes);549      }550    } else {551      lanes = getNextLanes(root, NoLanes);552      exitStatus = renderRootSync(root, lanes);553    }554    if (root.tag !== LegacyRoot && exitStatus === RootErrored) {555      executionContext |= RetryAfterError; // If an error occurred during hydration,556      // discard server response and fall back to client side render.557      if (root.hydrate) {558        root.hydrate = false;559        clearContainer(root.containerInfo);560      } // If something threw an error, try rendering one more time. We'll render561      // synchronously to block concurrent data mutations, and we'll includes562      // all pending updates are included. If it still fails after the second563      // attempt, we'll give up and commit the resulting tree.564      lanes = getLanesToRetrySynchronouslyOnError(root);565      if (lanes !== NoLanes) {...

ReactFiberWorkLoop.js

Source:ReactFiberWorkLoop.js

...350}351function  ensureRootIsScheduled(root, currentTime) {352  const existingCallbackNode = root.callbackNode;353  markStarvedLanesAsExpired(root, currentTime);354  const nextLanes = getNextLanes(355    root,356    root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes357  );358  359  const newCallbackPriority = returnNextLanesPriority();360  if(nextLanes === NoLanes) {361    if(existingCallbackNode !== null) {362      cancelCallback(existingCallbackNode);363      root.callbackNode = null;364      root.callbackPriority = NoLanePriority;365    }366    return;367  }368  if(existingCallbackNode !== null) {369    const existingCallbackPriority = root.callbackPriority;370    if(existingCallbackPriority === newCallbackPriority) {371      return;372    }373    cancelCallback(existingCallbackNode);374  }375  let newCallbackNode;376  if(newCallbackPriority === SyncLanePriority) {377    newCallbackNode = scheduleSyncCallback(378      performSyncWorkOnRoot.bind(null, root)379    );380  } else if(newCallbackPriority === SyncBatchedLanePriority) {381    newCallbackNode = scheduleCallback(382      ImmediateSchedulerPriority,383      performSyncWorkOnRoot.bind(null, root)384    )385  } else {386    // concurrent387  }388  root.callbackPriority = newCallbackPriority;389  root.callbackNode = newCallbackNode;390}391export function markSkippedUpdateLanes(lane) {392  workInProgressRootSkippedLanes = mergeLanes(393    lane,394    workInProgressRootSkippedLanes395  );396}397export function schedulePassiveEffectCallback() {398  if(!rootDoseHavePassiveEffects) {399    rootDoseHavePassiveEffects = true;400    scheduleCallback(401      NormalSchedulerPriority,402      () => {403        flushPassiveEffects();404        return null;405      }406    );407  }408}409function commitBeforeMutationEffects(firstChild) {410  let fiber = firstChild;411  // éå½å¤çfiber412  while(fiber !== null) {413    // if(fiber.deletions !== null) {414    //   commitBeforeMutationEffectsDeletions(fiber.deletions);415    // }416    if(fiber.child !== null) {417      const primarySubtreeFlags = fiber.subtreeFlags & BeforeMutationMask;418      if(primarySubtreeFlags !== NoFlags) {419        commitBeforeMutationEffects(fiber.child);420      }421    }422    try {423      commitBeforeMutationEffectsImpl(fiber);424    } catch(e) {425      426    }427    fiber = fiber.sibling;428  }429}430// function commitBeforeMutationEffects() {431//   while(nextEffect !== null) {432//     const current = nextEffect.alternate;433//     const flags = nextEffect.flags;434//     if((flags & Snapshot) !== NoFlags) {435//       commitBeforeMutationEffectOnFiber(current, nextEffect);436//     }437//     if((flags & Passive) !== NoFlags) {438//       if(!rootDoseHavePassiveEffects) {439//         rootDoseHavePassiveEffects = true;440//         scheduleCallback(441//           NormalSchedulerPriority,442//           () => {443//             flushPassiveEffects();444//             return null;445//           }446//         );447//       }448//     }449//     nextEffect = nextEffect.nextEffect;450//   }451// }452function commitBeforeMutationEffectsImpl(fiber) {453  const current = fiber.alternate;454  const flags = fiber.flags;455  if((flags & Snapshot) !== NoFlags) {456    commitBeforeMutationEffectsOnFiber(current, fiber);457  } 458  if((flags & Passive) !== NoFlags) {459    if(!rootDoseHavePassiveEffects) {460      rootDoseHavePassiveEffects = true;461      scheduleCallback(462        NormalSchedulerPriority,463        () => {464          flushPassiveEffects();465          return null;466        }467      );468    }469  }470}471function commitMutationEffects(firstChild, root, renderPriorityLevel) {472  let fiber = firstChild;473  while(fiber !== null) {474    if(fiber.child !== null) {475      const mutationFlags = fiber.subtreeFlags & MutationMask;476      if(mutationFlags !== NoFlags) {477        commitMutationEffects(fiber.child, root, renderPriorityLevel);478      }479    }480    try{481      commitMutationEffectsImpl(fiber, root, renderPriorityLevel);482    } catch(e) {483    }484    fiber = fiber.sibling;485  }486}487function commitMutationEffectsImpl(fiber, root, renderPriorityLevel) {488  const flags = fiber.flags;489  const primaryFlags = flags & (Placement | Update);490  switch(primaryFlags) {491    case Placement:492      commitPlacement(fiber);493      fiber.flags &= ~Placement;494      break;495    case PlacementAndUpdate:496      {497        commitPlacement(fiber);498        fiber.flags &= ~Placement;499        const current = fiber.alternate;500        commitWork(current, fiber);501        break;502      }503    case Update: {504      const current = fiber.alternate;505      commitWork(current, fiber);506      break;507    }508  }509}510function commitLayoutEffects(root, committedLanes) {511  while(nextEffect !== null) {512    const flags = nextEffect.flags;513    if(flags & (Update | Callback)) {514      const current = nextEffect.alternate;515      commitLayoutEffectOnFiber(root, current, nextEffect, committedLanes);516    }517    nextEffect = nextEffect.nextEffect;518  }519}520// function commitBeforeMutationEffectsDeletions(deletions) {521//   for(let i = 0; i < deletions.length; i++) {522//     const fiber = deletions[i];523//   }524// }525function performSyncWorkOnRoot(root) {526  flushPassiveEffects();527  let lanes;528  let existStatus;529  if(530    root === workInProgressRoot531    && includesSomeLane(root.exporedLanes, workInProgressRootRenderLanes)532  ) {533    lanes = workInProgressRootRenderLanes;534    existStatus = renderRootSync(root, lanes);535    if(includesSomeLane(536      workInProgressRootIncludedLanes,537      workInProgressRootUpdatedLanes538    )) {539      lanes = getNextLanes(root, lanes);540      existStatus = renderRootSync(root, lanes);541    }542  } else {543    lanes = getNextLanes(root, NoLanes);544    existStatus = renderRootSync(root, lanes);545  }546  const finishedWork = root.current.alternate;547  root.finishedWork = finishedWork;548  root.finishedLanes = lanes;549  console.log("====>>>>beforeCommitRoot", root);550  commitRoot(root);551  ensureRootIsScheduled(root, now());552  return null;553}554function scheduleUpdateOnFiber(fiber, lane, eventTime) {555  const root = markUpdateLaneFromFiberToRoot(fiber, lane);556  markRootUpdated(root, lane, eventTime);557  if(root === workInProgressRoot) {...

ReactFiberLane.js

Source:ReactFiberLane.js

...186  // We can always overwrite an existing timestamp because we prefer the most187  // recent event, and we assume time is monotonically increasingï¼åè°éå¢ï¼.188  eventTimes[index] = eventTime;189}190export function getNextLanes(root, wipLanes) {191  // é¦æ¬¡æ¸²ææ¶ï¼ å¨æ¬æä»¶27è¡ï¼ è®¾ç½®äºrootä¸çpendingLanesä¸º1192  const pendingLanes = root.pendingLanes;193  // Early bailout if there's no pending work left.194  if (pendingLanes === NoLanes) {195    return_highestLanePriority = NoLanePriority;196    return NoLanes;197  }198  let nextLanes = NoLanes;199  let nextLanePriority = NoLanePriority;200  // åæ¬¡æ¸²ææ¶ï¼ ä»¥ä¸å ä¸ªlanesåä¸º0201  const expiredLanes = root.expiredLanes;202  const suspendedLanes = root.suspendedLanes;203  const pingedLanes = root.pingedLanes;204  // Check if any work has expired....

FiberWorkLoop.js

Source:FiberWorkLoop.js

...111}112function ensureRootIsScheduled(root, currentTime){113  // update root.expirationTime. 114  markStarvedLanesAsExpired(root, currentTime);115  const nextLanes = getNextLanes(116    root, 117    root === wipRoot ? wipRootRenderLanes : NoLanes,118  );119  if (nextLanes === NoLanes){120    return;121  }122  const newCallbackPriority = getHighestPriorityLane(nextLanes);123  // Reuse existing task with the same priority.124  const existingCallbackPriority = root.callbackPriority;125  if (existingCallbackPriority === newCallbackPriority){126    return;127  }128  let newCallbackNode = scheduleCallback(129    performConcurrentWorkOnRoot.bind(null, root),130  );131  root.callbackPriority = newCallbackPriority;132  root.callbackNode = newCallbackNode;133}134// Entry point for every concurrent task, i.e. anything that135// goes through Scheduler.136function performConcurrentWorkOnRoot(root){137  currentEventTime = NoTimestamp;138  const originalCallbackNode = root.callbackNode;139  let lanes = getNextLanes(140    root,141    root === wipRoot ? wipRootRenderLanes : NoLanes,142  )143  let exitStatus = renderRootConcurrent(root, lanes); 144  if(exitStatus !== RootIncomplete){145    if(exitStatus === RootErrored){146      executionContext |= RootErrored;147      return null;148    }149    // now we have a consistent tree and ready to commit.150    const finishedWork = root.current.alternate151    root.finishedWork = finishedWork;152    root.finishedLanes = lanes;153    finishConcurrentRender(root, exitStatus, lanes);...

custom-reconciler.js

Source:custom-reconciler.js

...208    } else {209      // æ£æ¥æ¯å¦æå¶ä»laneè¢«å¦å¤çwork starvedï¼å¦ææ è®°ä»ä»¬è¿æï¼å¯ä»¥ä¸ä¸æ¬¡210      markStarbedLanesAsExpired(root, eventTime);211      // ä¸ä¸ä¸ªæ´æ°çlaneåæé212      let nextLanes = getNextLanes(root, NoLane);213    }214  }215}216function markStarbedLanesAsExpired(root, currentTime) {217  let pendingLanes = root.pendingLanes;218  let suspendedLanes = root.suspendedLanes;219  let pingedLanes = root.pingedLanes;220  let expirationTimes = root.expirationTimes;221  // æ£æ¥pending lanes æ¯å¦å·²ç»å°è¾¾äºä»ä»¬çç»æ¢æ¶é´ï¼222  let lanes = pendingLanes;223  while (lanes > 0) {224    let index = TotalLanes - Math.clz32(lanes);225    let lane = 1 << index;226    let expirationTime = expirationTimes[index];227    if (expirationTime === NoTimestamp) {228      if (229        (lane & suspendedLanes) === NoLane ||230        (lane & pingedLanes) !== NoLane231      ) {232        expirationTimes[index] = computeExpirationTime(lane, currentTime);233      }234    }235  }236}237let return_highestLanePriority = DefaultLanePriority;238function getHighestPriorityLanes(lane) {239  if ((SyncLane & lane) !== NoLane) {240    return_highestLanePriority = SyncLanePriority;241    return SyncLane;242  }243  if ((SyncBatchedLane & lane) !== NoLane) {244    return_highestLanePriority = SyncBatchedLanePriority;245    return SyncBatchedLane;246  }247  if ((InputDiscreteHydrationLane & lane) !== NoLane) {248    return_highestLanePriority = InputDiscreteHydrationLanePriority;249    return InputDiscreteHydrationLane;250  }251  if ((InputDiscreteLanes & lane) !== NoLane) {252    return_highestLanePriority = InputDiscreteLanePriority;253    return_InputDiscreteLanes = NoLanePriority;254  }255  // TODO ...256  return lane;257}258function getNextLanes(root, workInProgressLanes) {259  if (root.pendingLanes === NoLane) {260    return_highestLanePriority = NoLanePriority;261  }262}263function computeExpirationTime(lane, currentTime) {264  getHighestPriorityLanes(lane);265  if (return_highestLanePriority >= InputContinuousLanePriority) {266    return currentTime + 250;267  } else if (return_highestLanePriority >= TransitionPriority) {268    return currentTime + 5000;269  } else {270    return NoTimestamp;271  }272}...

FiberLane.js

Source:FiberLane.js

...29      console.error('Unknown lanes found:',lanes);30      return DefaultLane31  }32}33export function getNextLanes(root, wipLanes){34  const pendingLanes = root.pendingLanes;35  if (pendingLanes === NoLanes){36    return NoLanes;37  }38  if(root.suspendedLanes !== 0 || root.pingedLanes !== 0){39    console.error('suspendedLanes or pingedLanes Found:', root);40  }41  42  let nextLanes = getHighestPriorityLanes(pendingLanes);43  if(wipLanes !== nextLanes && wipLanes !== NoLanes){44    throw Error('New lanes found during Render Phase')45  }46  47  return nextLanes;...

index.js

Source:index.js

...11    performUnitOfWork(workInProgress);12  }13}14function performSyncWorkOnRoot() {15  const lanes = getNextLanes(root, NoLanes)16}17function begineWork(current, workInProgress) {18  if (current !== null) {19    // å½ current ä¸ä¸º null æ¶ï¼è¯´æè¯¥èç¹å·²ç»æè½½ï¼æå¤§å¯è½å°å¤ç¨æ§èç¹æ°æ®20    return bailoutOnAlreadyFinishedWork(21      current,22      workInProgress,23      renderLanes,24    );25  } else {26    didReceiveUpdate = false;27  }28  switch (workInProgress.tag) {29  }...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const lanes = await page.evaluate(() => {7    const { getNextLanes } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement');8    const lanes = getNextLanes();9    return lanes;10  });11  console.log(lanes);12  await browser.close();13})();14const { chromium } = require('playwright');15(async () => {16  const browser = await chromium.launch();17  const context = await browser.newContext();18  const page = await context.newPage();19  const lanes = await page.evaluate(() => {20    const { getNextLanes } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement');21    const lanes = getNextLanes();22    return lanes;23  });24  console.log(lanes);25  await browser.close();26})();27    at ExecutionContext._evaluateInternal (/home/ashish/.npm-global/lib/node_modules/playwright/node_modules/playwright-core/lib/server/frames.js:1337:19)28    at processTicksAndRejections (internal/process/task_queues.js:97:5)29    at async ExecutionContext.evaluate (/home/ashish/.npm-global/lib/node_modules/playwright/node_modules/playwright-core/lib/server/frames.js:1312:16)30    at async Object.<anonymous> (/home/ashish/Desktop/Playwright/test.js:12:19)

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  const page = await context.newPage();6  const lanes = await page._delegate.getNextLanes();7  console.log(lanes);8  await browser.close();9})();10[ Lane {

Using AI Code Generation

1const { Playwright } = require('playwright-core');2const { chromium } = Playwright;3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const frame = page.mainFrame();7  const nextLanes = await frame.getNextLanes();8  console.log(nextLanes);9  await browser.close();10})();11const { Playwright } = require('playwright-core');12const { chromium } = Playwright;13(async () => {14  const browser = await chromium.launch();15  const context = await browser.newContext();16  const frame = page.mainFrame();17  const nextLanes = await frame.getNextLanes();18  console.log(nextLanes);19  await browser.close();20})();21const { Playwright } = require('playwright-core');22const { chromium } = Playwright;23(async () => {24  const browser = await chromium.launch();25  const context = await browser.newContext();26  const frame = page.mainFrame();27  const nextLanes = await frame.getNextLanes();28  console.log(nextLanes);29  await browser.close();30})();31const { Playwright } = require('playwright-core');32const { chromium } = Playwright;

Using AI Code Generation

1const {chromium} = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const nextLanes = await page._delegate.getNextLanes();6  console.log(nextLanes);7  await browser.close();8})();9  {10      {11      },12      {13      }14  }15const nextLanes = await page._delegate.getNextLanes();16const navigationLane = nextLanes.find(lane => lane.name === 'navigation');17const nextLanes = await page._delegate.getNextLanes();18const navigationLane = nextLanes.find(lane => lane.name === 'navigation');

Using AI Code Generation

1const { chromium } = require('playwright');2const { getNextLanes } = require('playwright/lib/client/frames');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.click('text=Get started');8  const frames = await page.frames();9  const frame = frames.find(f => f.url().includes('docs'));10  const lanes = await getNextLanes(frame);11  console.log(lanes);12  await browser.close();13})();14  {15  },16  {17  }

Using AI Code Generation

1const { chromium } = require('playwright');2const { getNextLanes } = require('playwright/lib/protocol/channels');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const [frame] = await page.frames();8  const lanes = await getNextLanes(frame);9  console.log(lanes);10  await browser.close();11})();12[ { id: '0', name: 'default', frames: [ [Object] ] } ]

Using AI Code Generation

1const { chromium } = require('playwright');2const { getNextLanes } = require('playwright/lib/server/supplements/recorder/recorderSupplement');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  const lanes = await getNextLanes(page);7  console.log(lanes);8  await browser.close();9})();10  {11      {12        args: { selector: '[aria-label="Google apps"]' },13          {14            args: { selector: 'text=Google apps' },15          }16      },17      {18        args: { selector: 'text=Google apps' },19      }20  }21SyntaxError: Cannot use import statement outside a module22const { chromium } = require('playwright');23(async () => {24  const browser = await chromium.launch();25  const page = await browser.newPage();26  await page.screenshot({ path: `example.png` });27  await browser.close();28})();29SyntaxError: Cannot use import statement outside a module30const { chromium } = require('playwright');

Using AI Code Generation

1const { getNextLanes } = require('playwright/lib/protocol/protocol');2const { chromium } = require('playwright');3const fs = require('fs');4const path = require('path');5(async () => {6  const browser = await chromium.launch();7  const context = await browser.newContext();8  const page = await context.newPage();9  await page.waitForTimeout(2000);10  const cdpSession = await page.context().newCDPSession(page);11  const { lanes } = await cdpSession.send('Network.getNextLanes', {12  });13  fs.writeFileSync(14    path.join(__dirname, 'lanes.json'),15    JSON.stringify(lanes, null, 2)16  );17  await browser.close();18})();19  {20    "data": {21      "request": {22        "headers": {23          "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/89.0.4389.0 Safari/537.36",24          "Accept-Language": "en-US,en;q=0.9",25        },26      },27      "initiator": {28      },29      "timing": {

Using AI Code Generation

1const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');2const model = new TraceModel(traceEvents);3const lanes = getNextLanes(model, 0);4console.log(lanes);5const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');6const model = new TraceModel(traceEvents);7const lanes = getNextLanes(model, 1);8console.log(lanes);9const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');10const model = new TraceModel(traceEvents);11const lanes = getNextLanes(model, 2);12console.log(lanes);13const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');14const model = new TraceModel(traceEvents);15const lanes = getNextLanes(model, 3);16console.log(lanes);17const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');18const model = new TraceModel(traceEvents);19const lanes = getNextLanes(model, 4);20console.log(lanes);21const { getNextLanes } = require('playwright/lib/traceViewer/traceModel');22const model = new TraceModel(traceEvents);23const lanes = getNextLanes(model, 5);24console.log(lanes);

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.