Function performWork

packages/react-server/src/ReactFizzServer.js:5414–5470

(request: Request)

}

export function performWork(request: Request): void {
  if (request.status === CLOSED || request.status === CLOSING) {
    return;
  }
  const prevContext = getActiveContext();
  const prevDispatcher = ReactSharedInternals.H;
  ReactSharedInternals.H = HooksDispatcher;
  const prevAsyncDispatcher = ReactSharedInternals.A;
  ReactSharedInternals.A = DefaultAsyncDispatcher;

  const prevRequest = currentRequest;
  currentRequest = request;

  let prevGetCurrentStackImpl = null;
  if (__DEV__) {
    prevGetCurrentStackImpl = ReactSharedInternals.getCurrentStack;
    ReactSharedInternals.getCurrentStack = getCurrentStackInDEV;
  }
  const prevResumableState = currentResumableState;
  setCurrentResumableState(request.resumableState);
  try {
    const pingedTasks = request.pingedTasks;
    let i;
    for (i = 0; i < pingedTasks.length; i++) {
      const task = pingedTasks[i];
      retryTask(request, task);
    }
    pingedTasks.splice(0, i);
    if (request.destination !== null) {
      flushCompletedQueues(request, request.destination);
    }
  } catch (error) {
    const errorInfo: ThrownInfo = {};
    logRecoverableError(request, error, errorInfo, null);
    fatalError(request, error, errorInfo, null);
  } finally {
    setCurrentResumableState(prevResumableState);

    ReactSharedInternals.H = prevDispatcher;
    ReactSharedInternals.A = prevAsyncDispatcher;

    if (__DEV__) {
      ReactSharedInternals.getCurrentStack = prevGetCurrentStackImpl;
    }
    if (prevDispatcher === HooksDispatcher) {
      // This means that we were in a reentrant work loop. This could happen
      // in a renderer that supports synchronous work like renderToString,
      // when it's called from within another renderer.
      // Normally we don't bother switching the contexts to their root/default
      // values when leaving because we'll likely need the same or similar
      // context again. However, when we're inside a synchronous loop like this
      // we'll to restore the context to what it was before returning.
      switchContext(prevContext);
    }
    currentRequest = prevRequest;
  }
}