Function finishConcurrentRender

packages/react-reconciler/src/ReactFiberWorkLoop.js:1342–1497

(
  root: FiberRoot,
  exitStatus: RootExitStatus,
  finishedWork: Fiber,
  lanes: Lanes,
  renderEndTime: number, // Profiling-only
)

}

function finishConcurrentRender(
  root: FiberRoot,
  exitStatus: RootExitStatus,
  finishedWork: Fiber,
  lanes: Lanes,
  renderEndTime: number, // Profiling-only
) {
  // TODO: The fact that most of these branches are identical suggests that some
  // of the exit statuses are not best modeled as exit statuses and should be
  // tracked orthogonally.
  switch (exitStatus) {
    case RootInProgress:
    case RootFatalErrored: {
      throw new Error('Root did not complete. This is a bug in React.');
    }
    case RootSuspendedWithDelay: {
      if (!includesOnlyTransitions(lanes)) {
        // Commit the placeholder.
        break;
      }
    }
    // Fallthrough
    case RootSuspendedAtTheShell: {
      // This is a transition, so we should exit without committing a
      // placeholder and without scheduling a timeout. Delay indefinitely
      // until we receive more data.
      if (enableProfilerTimer && enableComponentPerformanceTrack) {
        setCurrentTrackFromLanes(lanes);
        logSuspendedRenderPhase(
          renderStartTime,
          renderEndTime,
          lanes,
          workInProgressUpdateTask,
        );
        finalizeRender(lanes, renderEndTime);
        trackSuspendedTime(lanes, renderEndTime);
      }
      const didAttemptEntireTree = !workInProgressRootDidSkipSuspendedSiblings;
      markRootSuspended(
        root,
        lanes,
        workInProgressDeferredLane,
        didAttemptEntireTree,
      );
      return;
    }
    case RootErrored: {
      // This render errored. Ignore any recoverable errors because we weren't actually
      // able to recover. Instead, whatever the final errors were is the ones we log.
      // This ensures that we only log the actual client side error if it's just a plain
      // error thrown from a component on the server and the client.
      workInProgressRootRecoverableErrors = null;
      break;
    }
    case RootSuspended:
    case RootCompleted: {
      break;
    }