How to use pickArbitraryLaneIndex method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberLane.new.js

Source:ReactFiberLane.new.js

...263  if (entangledLanes !== NoLanes) {264    const entanglements = root.entanglements;265    let lanes = nextLanes & entangledLanes;266    while (lanes > 0) {267      const index = pickArbitraryLaneIndex(lanes);268      const lane = 1 << index;269      nextLanes |= entanglements[index];270      lanes &= ~lane;271    }272  }273  return nextLanes;274}275export function getMostRecentEventTime(root: FiberRoot, lanes: Lanes): number {276  const eventTimes = root.eventTimes;277  let mostRecentEventTime = NoTimestamp;278  while (lanes > 0) {279    const index = pickArbitraryLaneIndex(lanes);280    const lane = 1 << index;281    const eventTime = eventTimes[index];282    if (eventTime > mostRecentEventTime) {283      mostRecentEventTime = eventTime;284    }285    lanes &= ~lane;286  }287  return mostRecentEventTime;288}289function computeExpirationTime(lane: Lane, currentTime: number) {290  switch (lane) {291    case SyncLane:292    case InputContinuousHydrationLane:293    case InputContinuousLane:294      // User interactions should expire slightly more quickly.295      //296      // NOTE: This is set to the corresponding constant as in Scheduler.js.297      // When we made it larger, a product metric in www regressed, suggesting298      // there's a user interaction that's being starved by a series of299      // synchronous updates. If that theory is correct, the proper solution is300      // to fix the starvation. However, this scenario supports the idea that301      // expiration times are an important safeguard when starvation302      // does happen.303      return currentTime + 250;304    case DefaultHydrationLane:305    case DefaultLane:306    case TransitionHydrationLane:307    case TransitionLane1:308    case TransitionLane2:309    case TransitionLane3:310    case TransitionLane4:311    case TransitionLane5:312    case TransitionLane6:313    case TransitionLane7:314    case TransitionLane8:315    case TransitionLane9:316    case TransitionLane10:317    case TransitionLane11:318    case TransitionLane12:319    case TransitionLane13:320    case TransitionLane14:321    case TransitionLane15:322    case TransitionLane16:323      return currentTime + 5000;324    case RetryLane1:325    case RetryLane2:326    case RetryLane3:327    case RetryLane4:328    case RetryLane5:329      // TODO: Retries should be allowed to expire if they are CPU bound for330      // too long, but when I made this change it caused a spike in browser331      // crashes. There must be some other underlying bug; not super urgent but332      // ideally should figure out why and fix it. Unfortunately we don't have333      // a repro for the crashes, only detected via production metrics.334      return NoTimestamp;335    case SelectiveHydrationLane:336    case IdleHydrationLane:337    case IdleLane:338    case OffscreenLane:339      // Anything idle priority or lower should never expire.340      return NoTimestamp;341    default:342      if (__DEV__) {343        console.error(344          'Should have found matching lanes. This is a bug in React.',345        );346      }347      return NoTimestamp;348  }349}350export function markStarvedLanesAsExpired(351  root: FiberRoot,352  currentTime: number,353): void {354  // TODO: This gets called every time we yield. We can optimize by storing355  // the earliest expiration time on the root. Then use that to quickly bail out356  // of this function.357  const pendingLanes = root.pendingLanes;358  const suspendedLanes = root.suspendedLanes;359  const pingedLanes = root.pingedLanes;360  const expirationTimes = root.expirationTimes;361  // Iterate through the pending lanes and check if we've reached their362  // expiration time. If so, we'll assume the update is being starved and mark363  // it as expired to force it to finish.364  let lanes = pendingLanes;365  while (lanes > 0) {366    const index = pickArbitraryLaneIndex(lanes);367    const lane = 1 << index;368    const expirationTime = expirationTimes[index];369    if (expirationTime === NoTimestamp) {370      // Found a pending lane with no expiration time. If it's not suspended, or371      // if it's pinged, assume it's CPU-bound. Compute a new expiration time372      // using the current time.373      if (374        (lane & suspendedLanes) === NoLanes ||375        (lane & pingedLanes) !== NoLanes376      ) {377        // Assumes timestamps are monotonically increasing.378        expirationTimes[index] = computeExpirationTime(lane, currentTime);379      }380    } else if (expirationTime <= currentTime) {381      // This lane expired382      root.expiredLanes |= lane;383    }384    lanes &= ~lane;385  }386}387// This returns the highest priority pending lanes regardless of whether they388// are suspended.389export function getHighestPriorityPendingLanes(root: FiberRoot) {390  return getHighestPriorityLanes(root.pendingLanes);391}392export function getLanesToRetrySynchronouslyOnError(root: FiberRoot): Lanes {393  const everythingButOffscreen = root.pendingLanes & ~OffscreenLane;394  if (everythingButOffscreen !== NoLanes) {395    return everythingButOffscreen;396  }397  if (everythingButOffscreen & OffscreenLane) {398    return OffscreenLane;399  }400  return NoLanes;401}402export function includesNonIdleWork(lanes: Lanes) {403  return (lanes & NonIdleLanes) !== NoLanes;404}405export function includesOnlyRetries(lanes: Lanes) {406  return (lanes & RetryLanes) === lanes;407}408export function includesOnlyTransitions(lanes: Lanes) {409  return (lanes & TransitionLanes) === lanes;410}411export function shouldTimeSlice(root: FiberRoot, lanes: Lanes) {412  if ((lanes & root.expiredLanes) !== NoLanes) {413    // At least one of these lanes expired. To prevent additional starvation,414    // finish rendering without yielding execution.415    return false;416  }417  if (418    allowConcurrentByDefault &&419    (root.current.mode & ConcurrentUpdatesByDefaultMode) !== NoMode420  ) {421    // Concurrent updates by default always use time slicing.422    return true;423  }424  const SyncDefaultLanes =425    InputContinuousHydrationLane |426    InputContinuousLane |427    DefaultHydrationLane |428    DefaultLane;429  return (lanes & SyncDefaultLanes) === NoLanes;430}431export function isTransitionLane(lane: Lane) {432  return (lane & TransitionLanes) !== 0;433}434export function claimNextTransitionLane(): Lane {435  // Cycle through the lanes, assigning each new transition to the next lane.436  // In most cases, this means every transition gets its own lane, until we437  // run out of lanes and cycle back to the beginning.438  const lane = nextTransitionLane;439  nextTransitionLane <<= 1;440  if ((nextTransitionLane & TransitionLanes) === 0) {441    nextTransitionLane = TransitionLane1;442  }443  return lane;444}445export function claimNextRetryLane(): Lane {446  const lane = nextRetryLane;447  nextRetryLane <<= 1;448  if ((nextRetryLane & RetryLanes) === 0) {449    nextRetryLane = RetryLane1;450  }451  return lane;452}453export function getHighestPriorityLane(lanes: Lanes): Lane {454  return lanes & -lanes;455}456export function pickArbitraryLane(lanes: Lanes): Lane {457  // This wrapper function gets inlined. Only exists so to communicate that it458  // doesn't matter which bit is selected; you can pick any bit without459  // affecting the algorithms where its used. Here I'm using460  // getHighestPriorityLane because it requires the fewest operations.461  return getHighestPriorityLane(lanes);462}463function pickArbitraryLaneIndex(lanes: Lanes) {464  return 31 - clz32(lanes);465}466function laneToIndex(lane: Lane) {467  return pickArbitraryLaneIndex(lane);468}469export function includesSomeLane(a: Lanes | Lane, b: Lanes | Lane) {470  return (a & b) !== NoLanes;471}472export function isSubsetOfLanes(set: Lanes, subset: Lanes | Lane) {473  return (set & subset) === subset;474}475export function mergeLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {476  return a | b;477}478export function removeLanes(set: Lanes, subset: Lanes | Lane): Lanes {479  return set & ~subset;480}481export function intersectLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {482  return a & b;483}484// Seems redundant, but it changes the type from a single lane (used for485// updates) to a group of lanes (used for flushing work).486export function laneToLanes(lane: Lane): Lanes {487  return lane;488}489export function higherPriorityLane(a: Lane, b: Lane) {490  // This works because the bit ranges decrease in priority as you go left.491  return a !== NoLane && a < b ? a : b;492}493export function createLaneMap<T>(initial: T): LaneMap<T> {494  // Intentionally pushing one by one.495  // https://v8.dev/blog/elements-kinds#avoid-creating-holes496  const laneMap = [];497  for (let i = 0; i < TotalLanes; i++) {498    laneMap.push(initial);499  }500  return laneMap;501}502export function markRootUpdated(503  root: FiberRoot,504  updateLane: Lane,505  eventTime: number,506) {507  root.pendingLanes |= updateLane;508  // If there are any suspended transitions, it's possible this new update509  // could unblock them. Clear the suspended lanes so that we can try rendering510  // them again.511  //512  // TODO: We really only need to unsuspend only lanes that are in the513  // `subtreeLanes` of the updated fiber, or the update lanes of the return514  // path. This would exclude suspended updates in an unrelated sibling tree,515  // since there's no way for this update to unblock it.516  //517  // We don't do this if the incoming update is idle, because we never process518  // idle updates until after all the regular updates have finished; there's no519  // way it could unblock a transition.520  if (updateLane !== IdleLane) {521    root.suspendedLanes = NoLanes;522    root.pingedLanes = NoLanes;523  }524  const eventTimes = root.eventTimes;525  const index = laneToIndex(updateLane);526  // We can always overwrite an existing timestamp because we prefer the most527  // recent event, and we assume time is monotonically increasing.528  eventTimes[index] = eventTime;529}530export function markRootSuspended(root: FiberRoot, suspendedLanes: Lanes) {531  root.suspendedLanes |= suspendedLanes;532  root.pingedLanes &= ~suspendedLanes;533  // The suspended lanes are no longer CPU-bound. Clear their expiration times.534  const expirationTimes = root.expirationTimes;535  let lanes = suspendedLanes;536  while (lanes > 0) {537    const index = pickArbitraryLaneIndex(lanes);538    const lane = 1 << index;539    expirationTimes[index] = NoTimestamp;540    lanes &= ~lane;541  }542}543export function markRootPinged(544  root: FiberRoot,545  pingedLanes: Lanes,546  eventTime: number,547) {548  root.pingedLanes |= root.suspendedLanes & pingedLanes;549}550export function markRootMutableRead(root: FiberRoot, updateLane: Lane) {551  root.mutableReadLanes |= updateLane & root.pendingLanes;552}553export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {554  const noLongerPendingLanes = root.pendingLanes & ~remainingLanes;555  root.pendingLanes = remainingLanes;556  // Let's try everything again557  root.suspendedLanes = 0;558  root.pingedLanes = 0;559  root.expiredLanes &= remainingLanes;560  root.mutableReadLanes &= remainingLanes;561  root.entangledLanes &= remainingLanes;562  if (enableCache) {563    const pooledCacheLanes = (root.pooledCacheLanes &= remainingLanes);564    if (pooledCacheLanes === NoLanes) {565      // None of the remaining work relies on the cache pool. Clear it so566      // subsequent requests get a new cache.567      root.pooledCache = null;568    }569  }570  const entanglements = root.entanglements;571  const eventTimes = root.eventTimes;572  const expirationTimes = root.expirationTimes;573  // Clear the lanes that no longer have pending work574  let lanes = noLongerPendingLanes;575  while (lanes > 0) {576    const index = pickArbitraryLaneIndex(lanes);577    const lane = 1 << index;578    entanglements[index] = NoLanes;579    eventTimes[index] = NoTimestamp;580    expirationTimes[index] = NoTimestamp;581    lanes &= ~lane;582  }583}584export function markRootEntangled(root: FiberRoot, entangledLanes: Lanes) {585  // In addition to entangling each of the given lanes with each other, we also586  // have to consider _transitive_ entanglements. For each lane that is already587  // entangled with *any* of the given lanes, that lane is now transitively588  // entangled with *all* the given lanes.589  //590  // Translated: If C is entangled with A, then entangling A with B also591  // entangles C with B.592  //593  // If this is hard to grasp, it might help to intentionally break this594  // function and look at the tests that fail in ReactTransition-test.js. Try595  // commenting out one of the conditions below.596  const rootEntangledLanes = (root.entangledLanes |= entangledLanes);597  const entanglements = root.entanglements;598  let lanes = rootEntangledLanes;599  while (lanes) {600    const index = pickArbitraryLaneIndex(lanes);601    const lane = 1 << index;602    if (603      // Is this one of the newly entangled lanes?604      (lane & entangledLanes) |605      // Is this lane transitively entangled with the newly entangled lanes?606      (entanglements[index] & entangledLanes)607    ) {608      entanglements[index] |= entangledLanes;609    }610    lanes &= ~lane;611  }612}613export function getBumpedLaneForHydration(614  root: FiberRoot,...

ReactFiberLane.old.js

Source:ReactFiberLane.old.js

...263  if (entangledLanes !== NoLanes) {264    const entanglements = root.entanglements;265    let lanes = nextLanes & entangledLanes;266    while (lanes > 0) {267      const index = pickArbitraryLaneIndex(lanes);268      const lane = 1 << index;269      nextLanes |= entanglements[index];270      lanes &= ~lane;271    }272  }273  return nextLanes;274}275export function getMostRecentEventTime(root: FiberRoot, lanes: Lanes): number {276  const eventTimes = root.eventTimes;277  let mostRecentEventTime = NoTimestamp;278  while (lanes > 0) {279    const index = pickArbitraryLaneIndex(lanes);280    const lane = 1 << index;281    const eventTime = eventTimes[index];282    if (eventTime > mostRecentEventTime) {283      mostRecentEventTime = eventTime;284    }285    lanes &= ~lane;286  }287  return mostRecentEventTime;288}289function computeExpirationTime(lane: Lane, currentTime: number) {290  switch (lane) {291    case SyncLane:292    case InputContinuousHydrationLane:293    case InputContinuousLane:294      // User interactions should expire slightly more quickly.295      //296      // NOTE: This is set to the corresponding constant as in Scheduler.js.297      // When we made it larger, a product metric in www regressed, suggesting298      // there's a user interaction that's being starved by a series of299      // synchronous updates. If that theory is correct, the proper solution is300      // to fix the starvation. However, this scenario supports the idea that301      // expiration times are an important safeguard when starvation302      // does happen.303      return currentTime + 250;304    case DefaultHydrationLane:305    case DefaultLane:306    case TransitionHydrationLane:307    case TransitionLane1:308    case TransitionLane2:309    case TransitionLane3:310    case TransitionLane4:311    case TransitionLane5:312    case TransitionLane6:313    case TransitionLane7:314    case TransitionLane8:315    case TransitionLane9:316    case TransitionLane10:317    case TransitionLane11:318    case TransitionLane12:319    case TransitionLane13:320    case TransitionLane14:321    case TransitionLane15:322    case TransitionLane16:323      return currentTime + 5000;324    case RetryLane1:325    case RetryLane2:326    case RetryLane3:327    case RetryLane4:328    case RetryLane5:329      // TODO: Retries should be allowed to expire if they are CPU bound for330      // too long, but when I made this change it caused a spike in browser331      // crashes. There must be some other underlying bug; not super urgent but332      // ideally should figure out why and fix it. Unfortunately we don't have333      // a repro for the crashes, only detected via production metrics.334      return NoTimestamp;335    case SelectiveHydrationLane:336    case IdleHydrationLane:337    case IdleLane:338    case OffscreenLane:339      // Anything idle priority or lower should never expire.340      return NoTimestamp;341    default:342      if (__DEV__) {343        console.error(344          'Should have found matching lanes. This is a bug in React.',345        );346      }347      return NoTimestamp;348  }349}350export function markStarvedLanesAsExpired(351  root: FiberRoot,352  currentTime: number,353): void {354  // TODO: This gets called every time we yield. We can optimize by storing355  // the earliest expiration time on the root. Then use that to quickly bail out356  // of this function.357  const pendingLanes = root.pendingLanes;358  const suspendedLanes = root.suspendedLanes;359  const pingedLanes = root.pingedLanes;360  const expirationTimes = root.expirationTimes;361  // Iterate through the pending lanes and check if we've reached their362  // expiration time. If so, we'll assume the update is being starved and mark363  // it as expired to force it to finish.364  let lanes = pendingLanes;365  while (lanes > 0) {366    const index = pickArbitraryLaneIndex(lanes);367    const lane = 1 << index;368    const expirationTime = expirationTimes[index];369    if (expirationTime === NoTimestamp) {370      // Found a pending lane with no expiration time. If it's not suspended, or371      // if it's pinged, assume it's CPU-bound. Compute a new expiration time372      // using the current time.373      if (374        (lane & suspendedLanes) === NoLanes ||375        (lane & pingedLanes) !== NoLanes376      ) {377        // Assumes timestamps are monotonically increasing.378        expirationTimes[index] = computeExpirationTime(lane, currentTime);379      }380    } else if (expirationTime <= currentTime) {381      // This lane expired382      root.expiredLanes |= lane;383    }384    lanes &= ~lane;385  }386}387// This returns the highest priority pending lanes regardless of whether they388// are suspended.389export function getHighestPriorityPendingLanes(root: FiberRoot) {390  return getHighestPriorityLanes(root.pendingLanes);391}392export function getLanesToRetrySynchronouslyOnError(root: FiberRoot): Lanes {393  const everythingButOffscreen = root.pendingLanes & ~OffscreenLane;394  if (everythingButOffscreen !== NoLanes) {395    return everythingButOffscreen;396  }397  if (everythingButOffscreen & OffscreenLane) {398    return OffscreenLane;399  }400  return NoLanes;401}402export function includesNonIdleWork(lanes: Lanes) {403  return (lanes & NonIdleLanes) !== NoLanes;404}405export function includesOnlyRetries(lanes: Lanes) {406  return (lanes & RetryLanes) === lanes;407}408export function includesOnlyTransitions(lanes: Lanes) {409  return (lanes & TransitionLanes) === lanes;410}411export function shouldTimeSlice(root: FiberRoot, lanes: Lanes) {412  if ((lanes & root.expiredLanes) !== NoLanes) {413    // At least one of these lanes expired. To prevent additional starvation,414    // finish rendering without yielding execution.415    return false;416  }417  if (418    allowConcurrentByDefault &&419    (root.current.mode & ConcurrentUpdatesByDefaultMode) !== NoMode420  ) {421    // Concurrent updates by default always use time slicing.422    return true;423  }424  const SyncDefaultLanes =425    InputContinuousHydrationLane |426    InputContinuousLane |427    DefaultHydrationLane |428    DefaultLane;429  return (lanes & SyncDefaultLanes) === NoLanes;430}431export function isTransitionLane(lane: Lane) {432  return (lane & TransitionLanes) !== 0;433}434export function claimNextTransitionLane(): Lane {435  // Cycle through the lanes, assigning each new transition to the next lane.436  // In most cases, this means every transition gets its own lane, until we437  // run out of lanes and cycle back to the beginning.438  const lane = nextTransitionLane;439  nextTransitionLane <<= 1;440  if ((nextTransitionLane & TransitionLanes) === 0) {441    nextTransitionLane = TransitionLane1;442  }443  return lane;444}445export function claimNextRetryLane(): Lane {446  const lane = nextRetryLane;447  nextRetryLane <<= 1;448  if ((nextRetryLane & RetryLanes) === 0) {449    nextRetryLane = RetryLane1;450  }451  return lane;452}453export function getHighestPriorityLane(lanes: Lanes): Lane {454  return lanes & -lanes;455}456export function pickArbitraryLane(lanes: Lanes): Lane {457  // This wrapper function gets inlined. Only exists so to communicate that it458  // doesn't matter which bit is selected; you can pick any bit without459  // affecting the algorithms where its used. Here I'm using460  // getHighestPriorityLane because it requires the fewest operations.461  return getHighestPriorityLane(lanes);462}463function pickArbitraryLaneIndex(lanes: Lanes) {464  return 31 - clz32(lanes);465}466function laneToIndex(lane: Lane) {467  return pickArbitraryLaneIndex(lane);468}469export function includesSomeLane(a: Lanes | Lane, b: Lanes | Lane) {470  return (a & b) !== NoLanes;471}472export function isSubsetOfLanes(set: Lanes, subset: Lanes | Lane) {473  return (set & subset) === subset;474}475export function mergeLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {476  return a | b;477}478export function removeLanes(set: Lanes, subset: Lanes | Lane): Lanes {479  return set & ~subset;480}481export function intersectLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {482  return a & b;483}484// Seems redundant, but it changes the type from a single lane (used for485// updates) to a group of lanes (used for flushing work).486export function laneToLanes(lane: Lane): Lanes {487  return lane;488}489export function higherPriorityLane(a: Lane, b: Lane) {490  // This works because the bit ranges decrease in priority as you go left.491  return a !== NoLane && a < b ? a : b;492}493export function createLaneMap<T>(initial: T): LaneMap<T> {494  // Intentionally pushing one by one.495  // https://v8.dev/blog/elements-kinds#avoid-creating-holes496  const laneMap = [];497  for (let i = 0; i < TotalLanes; i++) {498    laneMap.push(initial);499  }500  return laneMap;501}502export function markRootUpdated(503  root: FiberRoot,504  updateLane: Lane,505  eventTime: number,506) {507  root.pendingLanes |= updateLane;508  // If there are any suspended transitions, it's possible this new update509  // could unblock them. Clear the suspended lanes so that we can try rendering510  // them again.511  //512  // TODO: We really only need to unsuspend only lanes that are in the513  // `subtreeLanes` of the updated fiber, or the update lanes of the return514  // path. This would exclude suspended updates in an unrelated sibling tree,515  // since there's no way for this update to unblock it.516  //517  // We don't do this if the incoming update is idle, because we never process518  // idle updates until after all the regular updates have finished; there's no519  // way it could unblock a transition.520  if (updateLane !== IdleLane) {521    root.suspendedLanes = NoLanes;522    root.pingedLanes = NoLanes;523  }524  const eventTimes = root.eventTimes;525  const index = laneToIndex(updateLane);526  // We can always overwrite an existing timestamp because we prefer the most527  // recent event, and we assume time is monotonically increasing.528  eventTimes[index] = eventTime;529}530export function markRootSuspended(root: FiberRoot, suspendedLanes: Lanes) {531  root.suspendedLanes |= suspendedLanes;532  root.pingedLanes &= ~suspendedLanes;533  // The suspended lanes are no longer CPU-bound. Clear their expiration times.534  const expirationTimes = root.expirationTimes;535  let lanes = suspendedLanes;536  while (lanes > 0) {537    const index = pickArbitraryLaneIndex(lanes);538    const lane = 1 << index;539    expirationTimes[index] = NoTimestamp;540    lanes &= ~lane;541  }542}543export function markRootPinged(544  root: FiberRoot,545  pingedLanes: Lanes,546  eventTime: number,547) {548  root.pingedLanes |= root.suspendedLanes & pingedLanes;549}550export function markRootMutableRead(root: FiberRoot, updateLane: Lane) {551  root.mutableReadLanes |= updateLane & root.pendingLanes;552}553export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {554  const noLongerPendingLanes = root.pendingLanes & ~remainingLanes;555  root.pendingLanes = remainingLanes;556  // Let's try everything again557  root.suspendedLanes = 0;558  root.pingedLanes = 0;559  root.expiredLanes &= remainingLanes;560  root.mutableReadLanes &= remainingLanes;561  root.entangledLanes &= remainingLanes;562  if (enableCache) {563    const pooledCacheLanes = (root.pooledCacheLanes &= remainingLanes);564    if (pooledCacheLanes === NoLanes) {565      // None of the remaining work relies on the cache pool. Clear it so566      // subsequent requests get a new cache.567      root.pooledCache = null;568    }569  }570  const entanglements = root.entanglements;571  const eventTimes = root.eventTimes;572  const expirationTimes = root.expirationTimes;573  // Clear the lanes that no longer have pending work574  let lanes = noLongerPendingLanes;575  while (lanes > 0) {576    const index = pickArbitraryLaneIndex(lanes);577    const lane = 1 << index;578    entanglements[index] = NoLanes;579    eventTimes[index] = NoTimestamp;580    expirationTimes[index] = NoTimestamp;581    lanes &= ~lane;582  }583}584export function markRootEntangled(root: FiberRoot, entangledLanes: Lanes) {585  // In addition to entangling each of the given lanes with each other, we also586  // have to consider _transitive_ entanglements. For each lane that is already587  // entangled with *any* of the given lanes, that lane is now transitively588  // entangled with *all* the given lanes.589  //590  // Translated: If C is entangled with A, then entangling A with B also591  // entangles C with B.592  //593  // If this is hard to grasp, it might help to intentionally break this594  // function and look at the tests that fail in ReactTransition-test.js. Try595  // commenting out one of the conditions below.596  const rootEntangledLanes = (root.entangledLanes |= entangledLanes);597  const entanglements = root.entanglements;598  let lanes = rootEntangledLanes;599  while (lanes) {600    const index = pickArbitraryLaneIndex(lanes);601    const lane = 1 << index;602    if (603      // Is this one of the newly entangled lanes?604      (lane & entangledLanes) |605      // Is this lane transitively entangled with the newly entangled lanes?606      (entanglements[index] & entangledLanes)607    ) {608      entanglements[index] |= entangledLanes;609    }610    lanes &= ~lane;611  }612}613export function getBumpedLaneForHydration(614  root: FiberRoot,...

ReactFiberLane.js

Source:ReactFiberLane.js

...115  const higherPriorityLanes = updateLane - 1;116  root.suspendedLanes &= higherPriorityLanes;117  root.pingedLanes &= higherPriorityLanes;118  const eventTimes = root.eventTimes;119  const index = pickArbitraryLaneIndex(updateLane);120  eventTimes[index] = eventTime;121};122const markRootSuspended = (root, suspendedLanes) => {123  root.suspendedLanes |= suspendedLanes;124  root.pingedLanes &= ~suspendedLanes;125  const expirationTimes = root.expirationTimes;126  let lanes = suspendedLanes;127  while (lanes > 0) {128    const index = pickArbitraryLaneIndex(lanes);129    const lane = 1 << index;130    expirationTimes[index] = NoTimestamp;131    lanes &= ~lane;132  }133};134const includesSomeLane = (a, b) => (a & b) !== NoLanes;135let return_highestLanePriority = DefaultLanePriority;136const getHighestPriorityLanes = (lanes) => {137  if ((SyncLane & lanes) !== NoLanes) {138    return_highestLanePriority = SyncLanePriority;139    return SyncLane;140  }141  if ((SyncBatchedLane & lanes) !== NoLanes) {142    return_highestLanePriority = SyncBatchedLanePriority;143    return SyncBatchedLane;144  }145  if ((InputDiscreteHydrationLane & lanes) !== NoLanes) {146    return_highestLanePriority = InputDiscreteHydrationLanePriority;147    return InputDiscreteHydrationLane;148  }149  const inputDiscreteLanes = InputDiscreteLanes & lanes;150  if (inputDiscreteLanes !== NoLanes) {151    return_highestLanePriority = InputDiscreteLanePriority;152    return inputDiscreteLanes;153  }154  if ((lanes & InputContinuousHydrationLane) !== NoLanes) {155    return_highestLanePriority = InputContinuousHydrationLanePriority;156    return InputContinuousHydrationLane;157  }158  const inputContinuousLanes = InputContinuousLanes & lanes;159  if (inputContinuousLanes !== NoLanes) {160    return_highestLanePriority = InputContinuousLanePriority;161    return inputContinuousLanes;162  }163  if ((lanes & DefaultHydrationLane) !== NoLanes) {164    return_highestLanePriority = DefaultHydrationLanePriority;165    return DefaultHydrationLane;166  }167  const defaultLanes = DefaultLanes & lanes;168  if (defaultLanes !== NoLanes) {169    return_highestLanePriority = DefaultLanePriority;170    return defaultLanes;171  }172  if ((lanes & TransitionHydrationLane) !== NoLanes) {173    return_highestLanePriority = TransitionHydrationPriority;174    return TransitionHydrationLane;175  }176  const transitionLanes = TransitionLanes & lanes;177  if (transitionLanes !== NoLanes) {178    return_highestLanePriority = TransitionPriority;179    return transitionLanes;180  }181  const retryLanes = RetryLanes & lanes;182  if (retryLanes !== NoLanes) {183    return_highestLanePriority = RetryLanePriority;184    return retryLanes;185  }186  if (lanes & SelectiveHydrationLane) {187    return_highestLanePriority = SelectiveHydrationLanePriority;188    return SelectiveHydrationLane;189  }190  if ((lanes & IdleHydrationLane) !== NoLanes) {191    return_highestLanePriority = IdleHydrationLanePriority;192    return IdleHydrationLane;193  }194  const idleLanes = IdleLanes & lanes;195  if (idleLanes !== NoLanes) {196    return_highestLanePriority = IdleLanePriority;197    return idleLanes;198  }199  if ((OffscreenLane & lanes) !== NoLanes) {200    return_highestLanePriority = OffscreenLanePriority;201    return OffscreenLane;202  }203  return_highestLanePriority = DefaultLanePriority;204  return lanes;205};206const getLowestPriorityLane = (lanes) => {207  const index = 31 - Math.clz32(lanes);208  return index < 0 ? NoLanes : 1 << index;209};210const getNextLanes = (root, wipLanes) => {211  const pendingLanes = root.pendingLanes;212  if (pendingLanes === NoLanes) {213    return_highestLanePriority = NoLanePriority;214    return NoLanes;215  }216  let nextLanes = NoLanes;217  let nextLanePriority = NoLanePriority;218  const expiredLanes = root.expiredLanes;219  const suspendedLanes = root.suspendedLanes;220  const pingedLanes = root.pingedLanes;221  if (expiredLanes !== NoLanes) {222    nextLanes = expiredLanes;223    nextLanePriority = return_highestLanePriority = SyncLanePriority;224  } else {225    const nonIdlePendingLanes = pendingLanes & NonIdleLanes;226    if (nonIdlePendingLanes !== NoLanes) {227      const nonIdleUnblockedLanes = nonIdlePendingLanes & ~suspendedLanes;228      if (nonIdleUnblockedLanes !== NoLanes) {229        nextLanes = getHighestPriorityLanes(nonIdleUnblockedLanes);230        nextLanePriority = return_highestLanePriority;231      } else {232        const nonIdlePingedLanes = nonIdlePendingLanes & pingedLanes;233        if (nonIdlePingedLanes !== NoLanes) {234          nextLanes = getHighestPriorityLanes(nonIdlePingedLanes);235          nextLanePriority = return_highestLanePriority;236        }237      }238    } else {239      const unblockedLanes = pendingLanes & ~suspendedLanes;240      if (unblockedLanes !== NoLanes) {241        nextLanes = getHighestPriorityLanes(unblockedLanes);242        nextLanePriority = return_highestLanePriority;243      } else {244        if (pingedLanes !== NoLanes) {245          nextLanes = getHighestPriorityLanes(pingedLanes);246          nextLanePriority = return_highestLanePriority;247        }248      }249    }250  }251  if (nextLanes === NoLanes) {252    return NoLanes;253  }254  nextLanes = pendingLanes & ((getLowestPriorityLane(nextLanes) << 1) - 1);255  if (256    wipLanes !== NoLanes &&257    wipLanes !== nextLanes &&258    (wipLanes & suspendedLanes) === NoLanes259  ) {260    getHighestPriorityLanes(wipLanes);261    const wipLanePriority = return_highestLanePriority;262    if (nextLanePriority <= wipLanePriority) {263      return wipLanes;264    } else {265      return_highestLanePriority = nextLanePriority;266    }267  }268  const entangledLanes = root.entangledLanes;269  if (entangledLanes !== NoLanes) {270    const entanglements = root.entanglements;271    let lanes = nextLanes & entangledLanes;272    while (lanes > 0) {273      const index = pickArbitraryLaneIndex(lanes);274      const lane = 1 << index;275      nextLanes |= entanglements[index];276      lanes &= ~lane;277    }278  }279  return nextLanes;280};281const markRootFinished = (root, remainingLanes) => {282  const noLongerPendingLanes = root.pendingLanes & ~remainingLanes;283  root.pendingLanes = remainingLanes;284  root.suspendedLanes = 0;285  root.pingedLanes = 0;286  root.expiredLanes &= remainingLanes;287  root.mutableReadLanes &= remainingLanes;288  root.entangledLanes &= remainingLanes;289  const entanglements = root.entanglements;290  const eventTimes = root.eventTimes;291  const expirationTimes = root.expirationTimes;292  let lanes = noLongerPendingLanes;293  while (lanes > 0) {294    const index = pickArbitraryLaneIndex(lanes);295    const lane = 1 << index;296    entanglements[index] = NoLanes;297    eventTimes[index] = NoTimestamp;298    expirationTimes[index] = NoTimestamp;299    lanes &= ~lane;300  }301};302const hasDiscreteLanes = (lanes) => (lanes & InputDiscreteLanes) !== NoLanes;303const computeExpirationTime = (lane, currentTime) => {304  getHighestPriorityLanes(lane);305  const priority = return_highestLanePriority;306  if (priority >= InputContinuousLanePriority) {307    return currentTime + 250;308  } else if (priority >= TransitionPriority) {309    return currentTime + 5000;310  } else {311    return NoTimestamp;312  }313};314const markStarvedLanesAsExpired = (root, currentTime) => {315  const pendingLanes = root.pendingLanes;316  const suspendedLanes = root.suspendedLanes;317  const pingedLanes = root.pingedLanes;318  const expirationTimes = root.expirationTimes;319  let lanes = pendingLanes;320  while (lanes > 0) {321    const index = pickArbitraryLaneIndex(lanes);322    const lane = 1 << index;323    const expirationTime = expirationTimes[index];324    if (expirationTime === NoTimestamp) {325      if (326        (lane & suspendedLanes) === NoLanes ||327        (lane & pingedLanes) !== NoLanes328      ) {329        expirationTimes[index] = computeExpirationTime(lane, currentTime);330      }331    } else if (expirationTime <= currentTime) {332      root.expiredLanes |= lane;333    }334    lanes &= ~lane;335  }...

Using AI Code Generation

1const { Playwright } = require('playwright-core');2const { chromium } = require('playwright-core');3const playwright = new Playwright(__dirname);4const browser = await playwright.chromium.launch({5});6const context = await browser.newContext();7const page = await context.newPage();8await page.waitForTimeout(10000);9await browser.close();

Using AI Code Generation

1const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');2const lanes = ['a', 'b', 'c', 'd'];3const lane = pickArbitraryLaneIndex(lanes);4console.log(lane);5const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');6const lanes = ['a', 'b', 'c', 'd'];7const lane = pickArbitraryLaneIndex(lanes);8console.log(lane);9const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');10const lanes = ['a', 'b', 'c', 'd'];11const lane = pickArbitraryLaneIndex(lanes);12console.log(lane);13const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');14const lanes = ['a', 'b', 'c', 'd'];15const lane = pickArbitraryLaneIndex(lanes);16console.log(lane);17const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');18const lanes = ['a', 'b', 'c', 'd'];19const lane = pickArbitraryLaneIndex(lanes);20console.log(lane);21const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');22const lanes = ['a', 'b', 'c', 'd'];23const lane = pickArbitraryLaneIndex(lanes);24console.log(lane);25const {pickArbitraryLaneIndex} = require('playwright/lib/utils/lanes.js');26const lanes = ['a', 'b', 'c', 'd'];27const lane = pickArbitraryLaneIndex(lanes);28console.log(lane);

Using AI Code Generation

1const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');2const index = pickArbitraryLaneIndex(2);3console.log(index);4const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');5const index = pickArbitraryLaneIndex(3);6console.log(index);7const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');8const index = pickArbitraryLaneIndex(4);9console.log(index);10const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');11const index = pickArbitraryLaneIndex(5);12console.log(index);13const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');14const index = pickArbitraryLaneIndex(6);15console.log(index);16const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');17const index = pickArbitraryLaneIndex(7);18console.log(index);19const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');20const index = pickArbitraryLaneIndex(8);21console.log(index);22const { pickArbitraryLaneIndex } = require('playwright/lib/utils/lanes');23const index = pickArbitraryLaneIndex(9);24console.log(index);

Using AI Code Generation

1const {pickArbitraryLaneIndex} = require('@playwright/test/lib/runner/parallel');2const index = pickArbitraryLaneIndex();3console.log(index);4  throw err;5  throw err;6  throw err;7  throw err;8  throw err;9  throw err;10  throw err;11  throw err;

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.