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How to use computeThreadID method in Playwright Internal

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ReactFiberWorkLoop.old.js

Source:ReactFiberWorkLoop.old.js

...2085        }2086      }2087    }2088  }2089  function computeThreadID(root, lane) {2090    // Interaction threads are unique per root and expiration time.2091    // NOTE: Intentionally unsound cast. All that matters is that it's a number2092    // and it represents a batch of work. Could make a helper function instead,2093    // but meh this is fine for now.2094    return lane * 1000 + root.interactionThreadID;2095  }2096  function markSpawnedWork(lane) {2097    if (spawnedWorkDuringRender === null) {2098      spawnedWorkDuringRender = [lane];2099    } else {2100      spawnedWorkDuringRender.push(lane);2101    }2102  }2103  function scheduleInteractions(root, lane, interactions) {2104    if (interactions.size > 0) {2105      var pendingInteractionMap = root.pendingInteractionMap;2106      var pendingInteractions = pendingInteractionMap.get(lane);2107      if (pendingInteractions != null) {2108        interactions.forEach(function (interaction) {2109          if (!pendingInteractions.has(interaction)) {2110            // Update the pending async work count for previously unscheduled interaction.2111            interaction.__count++;2112          }2113          pendingInteractions.add(interaction);2114        });2115      } else {2116        pendingInteractionMap.set(lane, new Set(interactions)); // Update the pending async work count for the current interactions.2117        interactions.forEach(function (interaction) {2118          interaction.__count++;2119        });2120      }2121      var subscriber = __subscriberRef.current;2122      if (subscriber !== null) {2123        var threadID = computeThreadID(root, lane);2124        subscriber.onWorkScheduled(interactions, threadID);2125      }2126    }2127  }2128  function schedulePendingInteractions(root, lane) {2129    scheduleInteractions(root, lane, __interactionsRef.current);2130  }2131  function startWorkOnPendingInteractions(root, lanes) {2132    // we can accurately attribute time spent working on it, And so that cascading2133    // work triggered during the render phase will be associated with it.2134    var interactions = new Set();2135    root.pendingInteractionMap.forEach(function (scheduledInteractions, scheduledLane) {2136      if (includesSomeLane(lanes, scheduledLane)) {2137        scheduledInteractions.forEach(function (interaction) {2138          return interactions.add(interaction);2139        });2140      }2141    }); // Store the current set of interactions on the FiberRoot for a few reasons:2142    // We can re-use it in hot functions like performConcurrentWorkOnRoot()2143    // without having to recalculate it. We will also use it in commitWork() to2144    // pass to any Profiler onRender() hooks. This also provides DevTools with a2145    // way to access it when the onCommitRoot() hook is called.2146    root.memoizedInteractions = interactions;2147    if (interactions.size > 0) {2148      var subscriber = __subscriberRef.current;2149      if (subscriber !== null) {2150        var threadID = computeThreadID(root, lanes);2151        try {2152          subscriber.onWorkStarted(interactions, threadID);2153        } catch (error) {2154          // If the subscriber throws, rethrow it in a separate task2155          scheduleCallback(ImmediatePriority$1, function () {2156            throw error;2157          });2158        }2159      }2160    }2161  }2162  function finishPendingInteractions(root, committedLanes) {2163    var remainingLanesAfterCommit = root.pendingLanes;2164    var subscriber;2165    try {2166      subscriber = __subscriberRef.current;2167      if (subscriber !== null && root.memoizedInteractions.size > 0) {2168        // FIXME: More than one lane can finish in a single commit.2169        var threadID = computeThreadID(root, committedLanes);2170        subscriber.onWorkStopped(root.memoizedInteractions, threadID);2171      }2172    } catch (error) {2173      // If the subscriber throws, rethrow it in a separate task2174      scheduleCallback(ImmediatePriority$1, function () {2175        throw error;2176      });2177    } finally {2178      // Clear completed interactions from the pending Map.2179      // Unless the render was suspended or cascading work was scheduled,2180      // In which caseâ leave pending interactions until the subsequent render.2181      var pendingInteractionMap = root.pendingInteractionMap;2182      pendingInteractionMap.forEach(function (scheduledInteractions, lane) {2183        // Only decrement the pending interaction count if we're done....

ReactFiberScheduler.js

Source:ReactFiberScheduler.js

...752    let subscriber;753    try {754      subscriber = __subscriberRef.current;755      if (subscriber !== null && root.memoizedInteractions.size > 0) {756        const threadID = computeThreadID(757          committedExpirationTime,758          root.interactionThreadID,759        );760        subscriber.onWorkStopped(root.memoizedInteractions, threadID);761      }762    } catch (error) {763      // It's not safe for commitRoot() to throw.764      // Store the error for now and we'll re-throw in finishRendering().765      if (!hasUnhandledError) {766        hasUnhandledError = true;767        unhandledError = error;768      }769    } finally {770      // Clear completed interactions from the pending Map.771      // Unless the render was suspended or cascading work was scheduled,772      // In which caseâ leave pending interactions until the subsequent render.773      const pendingInteractionMap = root.pendingInteractionMap;774      pendingInteractionMap.forEach(775        (scheduledInteractions, scheduledExpirationTime) => {776          // Only decrement the pending interaction count if we're done.777          // If there's still work at the current priority,778          // That indicates that we are waiting for suspense data.779          if (scheduledExpirationTime > earliestRemainingTimeAfterCommit) {780            pendingInteractionMap.delete(scheduledExpirationTime);781            scheduledInteractions.forEach(interaction => {782              interaction.__count--;783              if (subscriber !== null && interaction.__count === 0) {784                try {785                  subscriber.onInteractionScheduledWorkCompleted(interaction);786                } catch (error) {787                  // It's not safe for commitRoot() to throw.788                  // Store the error for now and we'll re-throw in finishRendering().789                  if (!hasUnhandledError) {790                    hasUnhandledError = true;791                    unhandledError = error;792                  }793                }794              }795            });796          }797        },798      );799    }800  }801}802function resetChildExpirationTime(803  workInProgress: Fiber,804  renderTime: ExpirationTime,805) {806  if (renderTime !== Never && workInProgress.childExpirationTime === Never) {807    // The children of this component are hidden. Don't bubble their808    // expiration times.809    return;810  }811  let newChildExpirationTime = NoWork;812  // Bubble up the earliest expiration time.813  if (enableProfilerTimer && workInProgress.mode & ProfileMode) {814    // We're in profiling mode.815    // Let's use this same traversal to update the render durations.816    let actualDuration = workInProgress.actualDuration;817    let treeBaseDuration = workInProgress.selfBaseDuration;818    // When a fiber is cloned, its actualDuration is reset to 0.819    // This value will only be updated if work is done on the fiber (i.e. it doesn't bailout).820    // When work is done, it should bubble to the parent's actualDuration.821    // If the fiber has not been cloned though, (meaning no work was done),822    // Then this value will reflect the amount of time spent working on a previous render.823    // In that case it should not bubble.824    // We determine whether it was cloned by comparing the child pointer.825    const shouldBubbleActualDurations =826      workInProgress.alternate === null ||827      workInProgress.child !== workInProgress.alternate.child;828    let child = workInProgress.child;829    while (child !== null) {830      const childUpdateExpirationTime = child.expirationTime;831      const childChildExpirationTime = child.childExpirationTime;832      if (childUpdateExpirationTime > newChildExpirationTime) {833        newChildExpirationTime = childUpdateExpirationTime;834      }835      if (childChildExpirationTime > newChildExpirationTime) {836        newChildExpirationTime = childChildExpirationTime;837      }838      if (shouldBubbleActualDurations) {839        actualDuration += child.actualDuration;840      }841      treeBaseDuration += child.treeBaseDuration;842      child = child.sibling;843    }844    workInProgress.actualDuration = actualDuration;845    workInProgress.treeBaseDuration = treeBaseDuration;846  } else {847    let child = workInProgress.child;848    while (child !== null) {849      const childUpdateExpirationTime = child.expirationTime;850      const childChildExpirationTime = child.childExpirationTime;851      if (childUpdateExpirationTime > newChildExpirationTime) {852        newChildExpirationTime = childUpdateExpirationTime;853      }854      if (childChildExpirationTime > newChildExpirationTime) {855        newChildExpirationTime = childChildExpirationTime;856      }857      child = child.sibling;858    }859  }860  workInProgress.childExpirationTime = newChildExpirationTime;861}862function completeUnitOfWork(workInProgress: Fiber): Fiber | null {863  // Attempt to complete the current unit of work, then move to the864  // next sibling. If there are no more siblings, return to the865  // parent fiber.866  while (true) {867    // The current, flushed, state of this fiber is the alternate.868    // Ideally nothing should rely on this, but relying on it here869    // means that we don't need an additional field on the work in870    // progress.871    const current = workInProgress.alternate;872    if (__DEV__) {873      setCurrentFiber(workInProgress);874    }875    const returnFiber = workInProgress.return;876    const siblingFiber = workInProgress.sibling;877    if ((workInProgress.effectTag & Incomplete) === NoEffect) {878      if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {879        // Don't replay if it fails during completion phase.880        mayReplayFailedUnitOfWork = false;881      }882      // This fiber completed.883      // Remember we're completing this unit so we can find a boundary if it fails.884      nextUnitOfWork = workInProgress;885      if (enableProfilerTimer) {886        if (workInProgress.mode & ProfileMode) {887          startProfilerTimer(workInProgress);888        }889        nextUnitOfWork = completeWork(890          current,891          workInProgress,892          nextRenderExpirationTime,893        );894        if (workInProgress.mode & ProfileMode) {895          // Update render duration assuming we didn't error.896          stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);897        }898      } else {899        nextUnitOfWork = completeWork(900          current,901          workInProgress,902          nextRenderExpirationTime,903        );904      }905      if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {906        // We're out of completion phase so replaying is fine now.907        mayReplayFailedUnitOfWork = true;908      }909      stopWorkTimer(workInProgress);910      resetChildExpirationTime(workInProgress, nextRenderExpirationTime);911      if (__DEV__) {912        resetCurrentFiber();913      }914      if (nextUnitOfWork !== null) {915        // Completing this fiber spawned new work. Work on that next.916        return nextUnitOfWork;917      }918      if (919        returnFiber !== null &&920        // Do not append effects to parents if a sibling failed to complete921        (returnFiber.effectTag & Incomplete) === NoEffect922      ) {923        // Append all the effects of the subtree and this fiber onto the effect924        // list of the parent. The completion order of the children affects the925        // side-effect order.926        if (returnFiber.firstEffect === null) {927          returnFiber.firstEffect = workInProgress.firstEffect;928        }929        if (workInProgress.lastEffect !== null) {930          if (returnFiber.lastEffect !== null) {931            returnFiber.lastEffect.nextEffect = workInProgress.firstEffect;932          }933          returnFiber.lastEffect = workInProgress.lastEffect;934        }935        // If this fiber had side-effects, we append it AFTER the children's936        // side-effects. We can perform certain side-effects earlier if937        // needed, by doing multiple passes over the effect list. We don't want938        // to schedule our own side-effect on our own list because if end up939        // reusing children we'll schedule this effect onto itself since we're940        // at the end.941        const effectTag = workInProgress.effectTag;942        // Skip both NoWork and PerformedWork tags when creating the effect list.943        // PerformedWork effect is read by React DevTools but shouldn't be committed.944        if (effectTag > PerformedWork) {945          if (returnFiber.lastEffect !== null) {946            returnFiber.lastEffect.nextEffect = workInProgress;947          } else {948            returnFiber.firstEffect = workInProgress;949          }950          returnFiber.lastEffect = workInProgress;951        }952      }953      if (__DEV__ && ReactFiberInstrumentation.debugTool) {954        ReactFiberInstrumentation.debugTool.onCompleteWork(workInProgress);955      }956      if (siblingFiber !== null) {957        // If there is more work to do in this returnFiber, do that next.958        return siblingFiber;959      } else if (returnFiber !== null) {960        // If there's no more work in this returnFiber. Complete the returnFiber.961        workInProgress = returnFiber;962        continue;963      } else {964        // We've reached the root.965        return null;966      }967    } else {968      if (enableProfilerTimer && workInProgress.mode & ProfileMode) {969        // Record the render duration for the fiber that errored.970        stopProfilerTimerIfRunningAndRecordDelta(workInProgress, false);971        // Include the time spent working on failed children before continuing.972        let actualDuration = workInProgress.actualDuration;973        let child = workInProgress.child;974        while (child !== null) {975          actualDuration += child.actualDuration;976          child = child.sibling;977        }978        workInProgress.actualDuration = actualDuration;979      }980      // This fiber did not complete because something threw. Pop values off981      // the stack without entering the complete phase. If this is a boundary,982      // capture values if possible.983      const next = unwindWork(workInProgress, nextRenderExpirationTime);984      // Because this fiber did not complete, don't reset its expiration time.985      if (workInProgress.effectTag & DidCapture) {986        // Restarting an error boundary987        stopFailedWorkTimer(workInProgress);988      } else {989        stopWorkTimer(workInProgress);990      }991      if (__DEV__) {992        resetCurrentFiber();993      }994      if (next !== null) {995        stopWorkTimer(workInProgress);996        if (__DEV__ && ReactFiberInstrumentation.debugTool) {997          ReactFiberInstrumentation.debugTool.onCompleteWork(workInProgress);998        }999        // If completing this work spawned new work, do that next. We'll come1000        // back here again.1001        // Since we're restarting, remove anything that is not a host effect1002        // from the effect tag.1003        next.effectTag &= HostEffectMask;1004        return next;1005      }1006      if (returnFiber !== null) {1007        // Mark the parent fiber as incomplete and clear its effect list.1008        returnFiber.firstEffect = returnFiber.lastEffect = null;1009        returnFiber.effectTag |= Incomplete;1010      }1011      if (__DEV__ && ReactFiberInstrumentation.debugTool) {1012        ReactFiberInstrumentation.debugTool.onCompleteWork(workInProgress);1013      }1014      if (siblingFiber !== null) {1015        // If there is more work to do in this returnFiber, do that next.1016        return siblingFiber;1017      } else if (returnFiber !== null) {1018        // If there's no more work in this returnFiber. Complete the returnFiber.1019        workInProgress = returnFiber;1020        continue;1021      } else {1022        return null;1023      }1024    }1025  }1026  // Without this explicit null return Flow complains of invalid return type1027  // TODO Remove the above while(true) loop1028  // eslint-disable-next-line no-unreachable1029  return null;1030}1031function performUnitOfWork(workInProgress: Fiber): Fiber | null {1032  // The current, flushed, state of this fiber is the alternate.1033  // Ideally nothing should rely on this, but relying on it here1034  // means that we don't need an additional field on the work in1035  // progress.1036  const current = workInProgress.alternate;1037  // See if beginning this work spawns more work.1038  startWorkTimer(workInProgress);1039  if (__DEV__) {1040    setCurrentFiber(workInProgress);1041  }1042  if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {1043    stashedWorkInProgressProperties = assignFiberPropertiesInDEV(1044      stashedWorkInProgressProperties,1045      workInProgress,1046    );1047  }1048  let next;1049  if (enableProfilerTimer) {1050    if (workInProgress.mode & ProfileMode) {1051      startProfilerTimer(workInProgress);1052    }1053    next = beginWork(current, workInProgress, nextRenderExpirationTime);1054    workInProgress.memoizedProps = workInProgress.pendingProps;1055    if (workInProgress.mode & ProfileMode) {1056      // Record the render duration assuming we didn't bailout (or error).1057      stopProfilerTimerIfRunningAndRecordDelta(workInProgress, true);1058    }1059  } else {1060    next = beginWork(current, workInProgress, nextRenderExpirationTime);1061    workInProgress.memoizedProps = workInProgress.pendingProps;1062  }1063  if (__DEV__) {1064    resetCurrentFiber();1065    if (isReplayingFailedUnitOfWork) {1066      // Currently replaying a failed unit of work. This should be unreachable,1067      // because the render phase is meant to be idempotent, and it should1068      // have thrown again. Since it didn't, rethrow the original error, so1069      // React's internal stack is not misaligned.1070      rethrowOriginalError();1071    }1072  }1073  if (__DEV__ && ReactFiberInstrumentation.debugTool) {1074    ReactFiberInstrumentation.debugTool.onBeginWork(workInProgress);1075  }1076  if (next === null) {1077    // If this doesn't spawn new work, complete the current work.1078    next = completeUnitOfWork(workInProgress);1079  }1080  ReactCurrentOwner.current = null;1081  return next;1082}1083function workLoop(isYieldy) {1084  if (!isYieldy) {1085    // Flush work without yielding1086    while (nextUnitOfWork !== null) {1087      nextUnitOfWork = performUnitOfWork(nextUnitOfWork);1088    }1089  } else {1090    // Flush asynchronous work until there's a higher priority event1091    while (nextUnitOfWork !== null && !shouldYieldToRenderer()) {1092      nextUnitOfWork = performUnitOfWork(nextUnitOfWork);1093    }1094  }1095}1096function renderRoot(root: FiberRoot, isYieldy: boolean): void {1097  invariant(1098    !isWorking,1099    'renderRoot was called recursively. This error is likely caused ' +1100      'by a bug in React. Please file an issue.',1101  );1102  flushPassiveEffects();1103  isWorking = true;1104  if (enableHooks) {1105    ReactCurrentOwner.currentDispatcher = Dispatcher;1106  } else {1107    ReactCurrentOwner.currentDispatcher = DispatcherWithoutHooks;1108  }1109  const expirationTime = root.nextExpirationTimeToWorkOn;1110  // Check if we're starting from a fresh stack, or if we're resuming from1111  // previously yielded work.1112  if (1113    expirationTime !== nextRenderExpirationTime ||1114    root !== nextRoot ||1115    nextUnitOfWork === null1116  ) {1117    // Reset the stack and start working from the root.1118    resetStack();1119    nextRoot = root;1120    nextRenderExpirationTime = expirationTime;1121    nextUnitOfWork = createWorkInProgress(1122      nextRoot.current,1123      null,1124      nextRenderExpirationTime,1125    );1126    root.pendingCommitExpirationTime = NoWork;1127    if (enableSchedulerTracing) {1128      // Determine which interactions this batch of work currently includes,1129      // So that we can accurately attribute time spent working on it,1130      // And so that cascading work triggered during the render phase will be associated with it.1131      const interactions: Set<Interaction> = new Set();1132      root.pendingInteractionMap.forEach(1133        (scheduledInteractions, scheduledExpirationTime) => {1134          if (scheduledExpirationTime >= expirationTime) {1135            scheduledInteractions.forEach(interaction =>1136              interactions.add(interaction),1137            );1138          }1139        },1140      );1141      // Store the current set of interactions on the FiberRoot for a few reasons:1142      // We can re-use it in hot functions like renderRoot() without having to recalculate it.1143      // We will also use it in commitWork() to pass to any Profiler onRender() hooks.1144      // This also provides DevTools with a way to access it when the onCommitRoot() hook is called.1145      root.memoizedInteractions = interactions;1146      if (interactions.size > 0) {1147        const subscriber = __subscriberRef.current;1148        if (subscriber !== null) {1149          const threadID = computeThreadID(1150            expirationTime,1151            root.interactionThreadID,1152          );1153          try {1154            subscriber.onWorkStarted(interactions, threadID);1155          } catch (error) {1156            // Work thrown by an interaction tracing subscriber should be rethrown,1157            // But only once it's safe (to avoid leaving the scheduler in an invalid state).1158            // Store the error for now and we'll re-throw in finishRendering().1159            if (!hasUnhandledError) {1160              hasUnhandledError = true;1161              unhandledError = error;1162            }1163          }1164        }1165      }1166    }1167  }1168  let prevInteractions: Set<Interaction> = (null: any);1169  if (enableSchedulerTracing) {1170    // We're about to start new traced work.1171    // Restore pending interactions so cascading work triggered during the render phase will be accounted for.1172    prevInteractions = __interactionsRef.current;1173    __interactionsRef.current = root.memoizedInteractions;1174  }1175  let didFatal = false;1176  startWorkLoopTimer(nextUnitOfWork);1177  do {1178    try {1179      workLoop(isYieldy);1180    } catch (thrownValue) {1181      resetContextDependences();1182      resetHooks();1183      // Reset in case completion throws.1184      // This is only used in DEV and when replaying is on.1185      let mayReplay;1186      if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {1187        mayReplay = mayReplayFailedUnitOfWork;1188        mayReplayFailedUnitOfWork = true;1189      }1190      if (nextUnitOfWork === null) {1191        // This is a fatal error.1192        didFatal = true;1193        onUncaughtError(thrownValue);1194      } else {1195        if (enableProfilerTimer && nextUnitOfWork.mode & ProfileMode) {1196          // Record the time spent rendering before an error was thrown.1197          // This avoids inaccurate Profiler durations in the case of a suspended render.1198          stopProfilerTimerIfRunningAndRecordDelta(nextUnitOfWork, true);1199        }1200        if (__DEV__) {1201          // Reset global debug state1202          // We assume this is defined in DEV1203          (resetCurrentlyProcessingQueue: any)();1204        }1205        if (__DEV__ && replayFailedUnitOfWorkWithInvokeGuardedCallback) {1206          if (mayReplay) {1207            const failedUnitOfWork: Fiber = nextUnitOfWork;1208            replayUnitOfWork(failedUnitOfWork, thrownValue, isYieldy);1209          }1210        }1211        // TODO: we already know this isn't true in some cases.1212        // At least this shows a nicer error message until we figure out the cause.1213        // https://github.com/facebook/react/issues/12449#issuecomment-3867274311214        invariant(1215          nextUnitOfWork !== null,1216          'Failed to replay rendering after an error. This ' +1217            'is likely caused by a bug in React. Please file an issue ' +1218            'with a reproducing case to help us find it.',1219        );1220        const sourceFiber: Fiber = nextUnitOfWork;1221        let returnFiber = sourceFiber.return;1222        if (returnFiber === null) {1223          // This is the root. The root could capture its own errors. However,1224          // we don't know if it errors before or after we pushed the host1225          // context. This information is needed to avoid a stack mismatch.1226          // Because we're not sure, treat this as a fatal error. We could track1227          // which phase it fails in, but doesn't seem worth it. At least1228          // for now.1229          didFatal = true;1230          onUncaughtError(thrownValue);1231        } else {1232          throwException(1233            root,1234            returnFiber,1235            sourceFiber,1236            thrownValue,1237            nextRenderExpirationTime,1238          );1239          nextUnitOfWork = completeUnitOfWork(sourceFiber);1240          continue;1241        }1242      }1243    }1244    break;1245  } while (true);1246  if (enableSchedulerTracing) {1247    // Traced work is done for now; restore the previous interactions.1248    __interactionsRef.current = prevInteractions;1249  }1250  // We're done performing work. Time to clean up.1251  isWorking = false;1252  ReactCurrentOwner.currentDispatcher = null;1253  resetContextDependences();1254  resetHooks();1255  // Yield back to main thread.1256  if (didFatal) {1257    const didCompleteRoot = false;1258    stopWorkLoopTimer(interruptedBy, didCompleteRoot);1259    interruptedBy = null;1260    // There was a fatal error.1261    if (__DEV__) {1262      resetStackAfterFatalErrorInDev();1263    }1264    // `nextRoot` points to the in-progress root. A non-null value indicates1265    // that we're in the middle of an async render. Set it to null to indicate1266    // there's no more work to be done in the current batch.1267    nextRoot = null;1268    onFatal(root);1269    return;1270  }1271  if (nextUnitOfWork !== null) {1272    // There's still remaining async work in this tree, but we ran out of time1273    // in the current frame. Yield back to the renderer. Unless we're1274    // interrupted by a higher priority update, we'll continue later from where1275    // we left off.1276    const didCompleteRoot = false;1277    stopWorkLoopTimer(interruptedBy, didCompleteRoot);1278    interruptedBy = null;1279    onYield(root);1280    return;1281  }1282  // We completed the whole tree.1283  const didCompleteRoot = true;1284  stopWorkLoopTimer(interruptedBy, didCompleteRoot);1285  const rootWorkInProgress = root.current.alternate;1286  invariant(1287    rootWorkInProgress !== null,1288    'Finished root should have a work-in-progress. This error is likely ' +1289      'caused by a bug in React. Please file an issue.',1290  );1291  // `nextRoot` points to the in-progress root. A non-null value indicates1292  // that we're in the middle of an async render. Set it to null to indicate1293  // there's no more work to be done in the current batch.1294  nextRoot = null;1295  interruptedBy = null;1296  if (nextRenderDidError) {1297    // There was an error1298    if (hasLowerPriorityWork(root, expirationTime)) {1299      // There's lower priority work. If so, it may have the effect of fixing1300      // the exception that was just thrown. Exit without committing. This is1301      // similar to a suspend, but without a timeout because we're not waiting1302      // for a promise to resolve. React will restart at the lower1303      // priority level.1304      markSuspendedPriorityLevel(root, expirationTime);1305      const suspendedExpirationTime = expirationTime;1306      const rootExpirationTime = root.expirationTime;1307      onSuspend(1308        root,1309        rootWorkInProgress,1310        suspendedExpirationTime,1311        rootExpirationTime,1312        -1, // Indicates no timeout1313      );1314      return;1315    } else if (1316      // There's no lower priority work, but we're rendering asynchronously.1317      // Synchronsouly attempt to render the same level one more time. This is1318      // similar to a suspend, but without a timeout because we're not waiting1319      // for a promise to resolve.1320      !root.didError &&1321      isYieldy1322    ) {1323      root.didError = true;1324      const suspendedExpirationTime = (root.nextExpirationTimeToWorkOn = expirationTime);1325      const rootExpirationTime = (root.expirationTime = Sync);1326      onSuspend(1327        root,1328        rootWorkInProgress,1329        suspendedExpirationTime,1330        rootExpirationTime,1331        -1, // Indicates no timeout1332      );1333      return;1334    }1335  }1336  if (isYieldy && nextLatestAbsoluteTimeoutMs !== -1) {1337    // The tree was suspended.1338    const suspendedExpirationTime = expirationTime;1339    markSuspendedPriorityLevel(root, suspendedExpirationTime);1340    // Find the earliest uncommitted expiration time in the tree, including1341    // work that is suspended. The timeout threshold cannot be longer than1342    // the overall expiration.1343    const earliestExpirationTime = findEarliestOutstandingPriorityLevel(1344      root,1345      expirationTime,1346    );1347    const earliestExpirationTimeMs = expirationTimeToMs(earliestExpirationTime);1348    if (earliestExpirationTimeMs < nextLatestAbsoluteTimeoutMs) {1349      nextLatestAbsoluteTimeoutMs = earliestExpirationTimeMs;1350    }1351    // Subtract the current time from the absolute timeout to get the number1352    // of milliseconds until the timeout. In other words, convert an absolute1353    // timestamp to a relative time. This is the value that is passed1354    // to `setTimeout`.1355    const currentTimeMs = expirationTimeToMs(requestCurrentTime());1356    let msUntilTimeout = nextLatestAbsoluteTimeoutMs - currentTimeMs;1357    msUntilTimeout = msUntilTimeout < 0 ? 0 : msUntilTimeout;1358    // TODO: Account for the Just Noticeable Difference1359    const rootExpirationTime = root.expirationTime;1360    onSuspend(1361      root,1362      rootWorkInProgress,1363      suspendedExpirationTime,1364      rootExpirationTime,1365      msUntilTimeout,1366    );1367    return;1368  }1369  // Ready to commit.1370  onComplete(root, rootWorkInProgress, expirationTime);1371}1372function captureCommitPhaseError(sourceFiber: Fiber, value: mixed) {1373  const expirationTime = Sync;1374  let fiber = sourceFiber.return;1375  while (fiber !== null) {1376    switch (fiber.tag) {1377      case ClassComponent:1378        const ctor = fiber.type;1379        const instance = fiber.stateNode;1380        if (1381          typeof ctor.getDerivedStateFromError === 'function' ||1382          (typeof instance.componentDidCatch === 'function' &&1383            !isAlreadyFailedLegacyErrorBoundary(instance))1384        ) {1385          const errorInfo = createCapturedValue(value, sourceFiber);1386          const update = createClassErrorUpdate(1387            fiber,1388            errorInfo,1389            expirationTime,1390          );1391          enqueueUpdate(fiber, update);1392          scheduleWork(fiber, expirationTime);1393          return;1394        }1395        break;1396      case HostRoot: {1397        const errorInfo = createCapturedValue(value, sourceFiber);1398        const update = createRootErrorUpdate(fiber, errorInfo, expirationTime);1399        enqueueUpdate(fiber, update);1400        scheduleWork(fiber, expirationTime);1401        return;1402      }1403    }1404    fiber = fiber.return;1405  }1406  if (sourceFiber.tag === HostRoot) {1407    // Error was thrown at the root. There is no parent, so the root1408    // itself should capture it.1409    const rootFiber = sourceFiber;1410    const errorInfo = createCapturedValue(value, rootFiber);1411    const update = createRootErrorUpdate(rootFiber, errorInfo, expirationTime);1412    enqueueUpdate(rootFiber, update);1413    scheduleWork(rootFiber, expirationTime);1414  }1415}1416function computeThreadID(1417  expirationTime: ExpirationTime,1418  interactionThreadID: number,1419): number {1420  // Interaction threads are unique per root and expiration time.1421  return expirationTime * 1000 + interactionThreadID;1422}1423// Creates a unique async expiration time.1424function computeUniqueAsyncExpiration(): ExpirationTime {1425  const currentTime = requestCurrentTime();1426  let result = computeAsyncExpiration(currentTime);1427  if (result >= lastUniqueAsyncExpiration) {1428    // Since we assume the current time monotonically increases, we only hit1429    // this branch when computeUniqueAsyncExpiration is fired multiple times1430    // within a 200ms window (or whatever the async bucket size is).1431    result = lastUniqueAsyncExpiration - 1;1432  }1433  lastUniqueAsyncExpiration = result;1434  return lastUniqueAsyncExpiration;1435}1436function computeExpirationForFiber(currentTime: ExpirationTime, fiber: Fiber) {1437  let expirationTime;1438  if (expirationContext !== NoWork) {1439    // An explicit expiration context was set;1440    expirationTime = expirationContext;1441  } else if (isWorking) {1442    if (isCommitting) {1443      // Updates that occur during the commit phase should have sync priority1444      // by default.1445      expirationTime = Sync;1446    } else {1447      // Updates during the render phase should expire at the same time as1448      // the work that is being rendered.1449      expirationTime = nextRenderExpirationTime;1450    }1451  } else {1452    // No explicit expiration context was set, and we're not currently1453    // performing work. Calculate a new expiration time.1454    if (fiber.mode & ConcurrentMode) {1455      if (isBatchingInteractiveUpdates) {1456        // This is an interactive update1457        expirationTime = computeInteractiveExpiration(currentTime);1458      } else {1459        // This is an async update1460        expirationTime = computeAsyncExpiration(currentTime);1461      }1462      // If we're in the middle of rendering a tree, do not update at the same1463      // expiration time that is already rendering.1464      if (nextRoot !== null && expirationTime === nextRenderExpirationTime) {1465        expirationTime -= 1;1466      }1467    } else {1468      // This is a sync update1469      expirationTime = Sync;1470    }1471  }1472  if (isBatchingInteractiveUpdates) {1473    // This is an interactive update. Keep track of the lowest pending1474    // interactive expiration time. This allows us to synchronously flush1475    // all interactive updates when needed.1476    if (1477      lowestPriorityPendingInteractiveExpirationTime === NoWork ||1478      expirationTime < lowestPriorityPendingInteractiveExpirationTime1479    ) {1480      lowestPriorityPendingInteractiveExpirationTime = expirationTime;1481    }1482  }1483  return expirationTime;1484}1485function renderDidSuspend(1486  root: FiberRoot,1487  absoluteTimeoutMs: number,1488  suspendedTime: ExpirationTime,1489) {1490  // Schedule the timeout.1491  if (1492    absoluteTimeoutMs >= 0 &&1493    nextLatestAbsoluteTimeoutMs < absoluteTimeoutMs1494  ) {1495    nextLatestAbsoluteTimeoutMs = absoluteTimeoutMs;1496  }1497}1498function renderDidError() {1499  nextRenderDidError = true;1500}1501function pingSuspendedRoot(1502  root: FiberRoot,1503  thenable: Thenable,1504  pingTime: ExpirationTime,1505) {1506  // A promise that previously suspended React from committing has resolved.1507  // If React is still suspended, try again at the previous level (pingTime).1508  const pingCache = root.pingCache;1509  if (pingCache !== null) {1510    // The thenable resolved, so we no longer need to memoize, because it will1511    // never be thrown again.1512    pingCache.delete(thenable);1513  }1514  if (nextRoot !== null && nextRenderExpirationTime === pingTime) {1515    // Received a ping at the same priority level at which we're currently1516    // rendering. Restart from the root.1517    nextRoot = null;1518  } else {1519    // Confirm that the root is still suspended at this level. Otherwise exit.1520    if (isPriorityLevelSuspended(root, pingTime)) {1521      // Ping at the original level1522      markPingedPriorityLevel(root, pingTime);1523      const rootExpirationTime = root.expirationTime;1524      if (rootExpirationTime !== NoWork) {1525        requestWork(root, rootExpirationTime);1526      }1527    }1528  }1529}1530function retryTimedOutBoundary(boundaryFiber: Fiber, thenable: Thenable) {1531  // The boundary fiber (a Suspense component) previously timed out and was1532  // rendered in its fallback state. One of the promises that suspended it has1533  // resolved, which means at least part of the tree was likely unblocked. Try1534  // rendering again, at a new expiration time.1535  const retryCache: WeakSet<Thenable> | Set<Thenable> | null =1536    boundaryFiber.stateNode;1537  if (retryCache !== null) {1538    // The thenable resolved, so we no longer need to memoize, because it will1539    // never be thrown again.1540    retryCache.delete(thenable);1541  }1542  const currentTime = requestCurrentTime();1543  const retryTime = computeExpirationForFiber(currentTime, boundaryFiber);1544  const root = scheduleWorkToRoot(boundaryFiber, retryTime);1545  if (root !== null) {1546    markPendingPriorityLevel(root, retryTime);1547    const rootExpirationTime = root.expirationTime;1548    if (rootExpirationTime !== NoWork) {1549      requestWork(root, rootExpirationTime);1550    }1551  }1552}1553function scheduleWorkToRoot(fiber: Fiber, expirationTime): FiberRoot | null {1554  recordScheduleUpdate();1555  if (__DEV__) {1556    if (fiber.tag === ClassComponent) {1557      const instance = fiber.stateNode;1558      warnAboutInvalidUpdates(instance);1559    }1560  }1561  // Update the source fiber's expiration time1562  if (fiber.expirationTime < expirationTime) {1563    fiber.expirationTime = expirationTime;1564  }1565  let alternate = fiber.alternate;1566  if (alternate !== null && alternate.expirationTime < expirationTime) {1567    alternate.expirationTime = expirationTime;1568  }1569  // Walk the parent path to the root and update the child expiration time.1570  let node = fiber.return;1571  let root = null;1572  if (node === null && fiber.tag === HostRoot) {1573    root = fiber.stateNode;1574  } else {1575    while (node !== null) {1576      alternate = node.alternate;1577      if (node.childExpirationTime < expirationTime) {1578        node.childExpirationTime = expirationTime;1579        if (1580          alternate !== null &&1581          alternate.childExpirationTime < expirationTime1582        ) {1583          alternate.childExpirationTime = expirationTime;1584        }1585      } else if (1586        alternate !== null &&1587        alternate.childExpirationTime < expirationTime1588      ) {1589        alternate.childExpirationTime = expirationTime;1590      }1591      if (node.return === null && node.tag === HostRoot) {1592        root = node.stateNode;1593        break;1594      }1595      node = node.return;1596    }1597  }1598  if (enableSchedulerTracing) {1599    if (root !== null) {1600      const interactions = __interactionsRef.current;1601      if (interactions.size > 0) {1602        const pendingInteractionMap = root.pendingInteractionMap;1603        const pendingInteractions = pendingInteractionMap.get(expirationTime);1604        if (pendingInteractions != null) {1605          interactions.forEach(interaction => {1606            if (!pendingInteractions.has(interaction)) {1607              // Update the pending async work count for previously unscheduled interaction.1608              interaction.__count++;1609            }1610            pendingInteractions.add(interaction);1611          });1612        } else {1613          pendingInteractionMap.set(expirationTime, new Set(interactions));1614          // Update the pending async work count for the current interactions.1615          interactions.forEach(interaction => {1616            interaction.__count++;1617          });1618        }1619        const subscriber = __subscriberRef.current;1620        if (subscriber !== null) {1621          const threadID = computeThreadID(1622            expirationTime,1623            root.interactionThreadID,1624          );1625          subscriber.onWorkScheduled(interactions, threadID);1626        }1627      }1628    }1629  }1630  return root;1631}1632function scheduleWork(fiber: Fiber, expirationTime: ExpirationTime) {1633  const root = scheduleWorkToRoot(fiber, expirationTime);1634  if (root === null) {1635    if (__DEV__) {...

ReactFiberScheduler.new.js

Source:ReactFiberScheduler.new.js

...1876    }1877  }1878}1879export const warnIfNotCurrentlyActingUpdatesInDev = warnIfNotCurrentlyActingUpdatesInDEV;1880function computeThreadID(root, expirationTime) {1881  // Interaction threads are unique per root and expiration time.1882  return expirationTime * 1000 + root.interactionThreadID;1883}1884function schedulePendingInteraction(root, expirationTime) {1885  // This is called when work is scheduled on a root. It sets up a pending1886  // interaction, which is completed once the work commits.1887  if (!enableSchedulerTracing) {1888    return;1889  }1890  const interactions = __interactionsRef.current;1891  if (interactions.size > 0) {1892    const pendingInteractionMap = root.pendingInteractionMap;1893    const pendingInteractions = pendingInteractionMap.get(expirationTime);1894    if (pendingInteractions != null) {1895      interactions.forEach(interaction => {1896        if (!pendingInteractions.has(interaction)) {1897          // Update the pending async work count for previously unscheduled interaction.1898          interaction.__count++;1899        }1900        pendingInteractions.add(interaction);1901      });1902    } else {1903      pendingInteractionMap.set(expirationTime, new Set(interactions));1904      // Update the pending async work count for the current interactions.1905      interactions.forEach(interaction => {1906        interaction.__count++;1907      });1908    }1909    const subscriber = __subscriberRef.current;1910    if (subscriber !== null) {1911      const threadID = computeThreadID(root, expirationTime);1912      subscriber.onWorkScheduled(interactions, threadID);1913    }1914  }1915}1916function startWorkOnPendingInteraction(root, expirationTime) {1917  // This is called when new work is started on a root.1918  if (!enableSchedulerTracing) {1919    return;1920  }1921  // Determine which interactions this batch of work currently includes, So that1922  // we can accurately attribute time spent working on it, And so that cascading1923  // work triggered during the render phase will be associated with it.1924  const interactions: Set<Interaction> = new Set();1925  root.pendingInteractionMap.forEach(1926    (scheduledInteractions, scheduledExpirationTime) => {1927      if (scheduledExpirationTime >= expirationTime) {1928        scheduledInteractions.forEach(interaction =>1929          interactions.add(interaction),1930        );1931      }1932    },1933  );1934  // Store the current set of interactions on the FiberRoot for a few reasons:1935  // We can re-use it in hot functions like renderRoot() without having to1936  // recalculate it. We will also use it in commitWork() to pass to any Profiler1937  // onRender() hooks. This also provides DevTools with a way to access it when1938  // the onCommitRoot() hook is called.1939  root.memoizedInteractions = interactions;1940  if (interactions.size > 0) {1941    const subscriber = __subscriberRef.current;1942    if (subscriber !== null) {1943      const threadID = computeThreadID(root, expirationTime);1944      try {1945        subscriber.onWorkStarted(interactions, threadID);1946      } catch (error) {1947        // If the subscriber throws, rethrow it in a separate task1948        scheduleCallback(ImmediatePriority, () => {1949          throw error;1950        });1951      }1952    }1953  }1954}1955function finishPendingInteractions(root, committedExpirationTime) {1956  if (!enableSchedulerTracing) {1957    return;1958  }1959  const earliestRemainingTimeAfterCommit = root.firstPendingTime;1960  let subscriber;1961  try {1962    subscriber = __subscriberRef.current;1963    if (subscriber !== null && root.memoizedInteractions.size > 0) {1964      const threadID = computeThreadID(root, committedExpirationTime);1965      subscriber.onWorkStopped(root.memoizedInteractions, threadID);1966    }1967  } catch (error) {1968    // If the subscriber throws, rethrow it in a separate task1969    scheduleCallback(ImmediatePriority, () => {1970      throw error;1971    });1972  } finally {1973    // Clear completed interactions from the pending Map.1974    // Unless the render was suspended or cascading work was scheduled,1975    // In which caseâ leave pending interactions until the subsequent render.1976    const pendingInteractionMap = root.pendingInteractionMap;1977    pendingInteractionMap.forEach(1978      (scheduledInteractions, scheduledExpirationTime) => {...

Using AI Code Generation

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

Using AI Code Generation

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

Using AI Code Generation

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

Using AI Code Generation

1const { computeThreadID } = require('playwright/lib/utils/worker');2const { Worker } = require('worker_threads');3const worker = new Worker(`4const { computeThreadID } = require('playwright/lib/utils/worker');5console.log(computeThreadID());6`, { eval: true });7worker.on('message', (message) => {8  console.log(message);9});10worker.on('error', (error) => {11  console.error(error);12});13worker.on('exit', (code) => {14  if (code !== 0)15    console.error(new Error(`Worker stopped with exit code ${code}`));16});17worker.postMessage('computeThreadID');18const { threadId } = require('worker_threads');19console.log(threadId);

Using AI Code Generation

1const { computeThreadID } = require('playwright/lib/server/browserContext');2const threadID = computeThreadID({ browserName: 'chromium', deviceScaleFactor: 1, isMobile: false, hasTouch: false, viewport: { width: 800, height: 600 } });3console.log(threadID);4const { computeThreadID } = require('playwright/lib/server/browserContext');5const threadID = computeThreadID({ browserName: 'chromium', deviceScaleFactor: 1, isMobile: false, hasTouch: false, viewport: { width: 800, height: 600 } });6console.log(threadID);7const { computeThreadID } = require('playwright/lib/server/browserContext'); const threadID = computeThreadID({ browserName: 'chromium', deviceScaleFactor: 1, isMobile: false, hasTouch: false, viewport: { width: 800, height: 600 } }); console.log(threadID);

Using AI Code Generation

1const { computeThreadID } = require('playwright/lib/utils/utils');2const threadID = computeThreadID();3console.log(threadID);4const { computeThreadID } = require('playwright/lib/utils/utils');5const threadID = computeThreadID();6console.log(threadID);7const { computeThreadID } = require('playwright/lib/utils/utils');8const threadID = computeThreadID();9console.log(threadID);10const { computeThreadID } = require('playwright/lib/utils/utils');11const threadID = computeThreadID();12console.log(threadID);13const { computeThreadID } = require('playwright/lib/utils/utils');14const threadID = computeThreadID();15console.log(threadID);16const { computeThreadID } = require('playwright/lib/utils/utils');17const threadID = computeThreadID();18console.log(threadID);19const { computeThreadID } = require('playwright/lib/utils/utils');20const threadID = computeThreadID();21console.log(threadID);22const { computeThreadID } = require('playwright/lib/utils/utils');23const threadID = computeThreadID();24console.log(threadID);25const { computeThreadID } = require('playwright/lib/utils/utils');26const threadID = computeThreadID();27console.log(threadID);28const { computeThreadID } = require('playwright/lib/utils/utils');29const threadID = computeThreadID();30console.log(threadID);31const { computeThreadID } = require('playwright/lib/utils/utils');

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const threadID = await page.computeThreadID();6  console.log(threadID);7  await browser.close();8})();

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.