tryHydrateActivity() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberHydrationContext.js lines 304–335

function tryHydrateActivity(
  fiber: Fiber,
  nextInstance: any,
): null | ActivityInstance {
  // fiber is a ActivityComponent Fiber
  const activityInstance = canHydrateActivityInstance(
    nextInstance,
    rootOrSingletonContext,
  );
  if (activityInstance !== null) {
    const activityState: ActivityState = {
      dehydrated: activityInstance,
      treeContext: getSuspendedTreeContext(),
      retryLane: OffscreenLane,
      hydrationErrors: null,
    };
    fiber.memoizedState = activityState;
    // Store the dehydrated fragment as a child fiber.
    // This simplifies the code for getHostSibling and deleting nodes,
    // since it doesn't have to consider all Suspense boundaries and
    // check if they're dehydrated ones or not.
    const dehydratedFragment =
      createFiberFromDehydratedFragment(activityInstance);
    dehydratedFragment.return = fiber;
    fiber.child = dehydratedFragment;
    hydrationParentFiber = fiber;
    // While an Activity Instance does have children, we won't step into
    // it during the first pass. Instead, we'll reenter it later.
    nextHydratableInstance = null;
  }
  return activityInstance;
}