Function replaySuspenseBoundary

packages/react-server/src/ReactFizzServer.js:1621–1795

(
  request: Request,
  task: ReplayTask,
  keyPath: KeyNode,
  props: Object,
  id: number,
  childNodes: Array<ReplayNode>,
  childSlots: ResumeSlots,
  fallbackNodes: Array<ReplayNode>,
  fallbackSlots: ResumeSlots,
)

}

function replaySuspenseBoundary(
  request: Request,
  task: ReplayTask,
  keyPath: KeyNode,
  props: Object,
  id: number,
  childNodes: Array<ReplayNode>,
  childSlots: ResumeSlots,
  fallbackNodes: Array<ReplayNode>,
  fallbackSlots: ResumeSlots,
): void {
  const prevKeyPath = task.keyPath;
  const prevContext = task.formatContext;
  const prevRow = task.row;
  const previousReplaySet: ReplaySet = task.replay;

  const parentBoundary = task.blockedBoundary;
  const parentHoistableState = task.hoistableState;

  const content: ReactNodeList = props.children;
  const fallback: ReactNodeList = props.fallback;

  const fallbackAbortSet: Set<Task> = new Set();
  let resumedBoundary: SuspenseBoundary;
  if (canHavePreamble(task.formatContext)) {
    resumedBoundary = createSuspenseBoundary(
      request,
      task.row,
      fallbackAbortSet,
      createPreambleState(),
      createPreambleState(),
    );
  } else {
    resumedBoundary = createSuspenseBoundary(
      request,
      task.row,
      fallbackAbortSet,
      null,
      null,
    );
  }
  resumedBoundary.parentFlushed = true;
  // We restore the same id of this boundary as was used during prerender.
  resumedBoundary.rootSegmentID = id;

  // We can reuse the current context and task to render the content immediately without
  // context switching. We just need to temporarily switch which boundary and replay node
  // we're writing to. If something suspends, it'll spawn new suspended task with that context.
  task.blockedBoundary = resumedBoundary;
  task.hoistableState = resumedBoundary.contentState;
  task.keyPath = keyPath;
  task.formatContext = getSuspenseContentFormatContext(
    request.resumableState,
    prevContext,
  );
  task.row = null;
  task.replay = {nodes: childNodes, slots: childSlots, pendingTasks: 1};