Function switch

packages/react-reconciler/src/ReactFiberHooks.js:3513–3550

(provider.tag)

  let provider = fiber.return;
  while (provider !== null) {
    switch (provider.tag) {
      case CacheComponent:
      case HostRoot: {
        // Schedule an update on the cache boundary to trigger a refresh.
        const lane = requestUpdateLane(provider);
        const refreshUpdate = createLegacyQueueUpdate(lane);
        const root = enqueueLegacyQueueUpdate(provider, refreshUpdate, lane);
        if (root !== null) {
          startUpdateTimerByLane(lane, 'refresh()', fiber);
          scheduleUpdateOnFiber(root, provider, lane);
          entangleLegacyQueueTransitions(root, provider, lane);
        }

        // TODO: If a refresh never commits, the new cache created here must be
        // released. A simple case is start refreshing a cache boundary, but then
        // unmount that boundary before the refresh completes.
        const seededCache = createCache();
        if (seedKey !== null && seedKey !== undefined && root !== null) {
          if (enableLegacyCache) {
            // Seed the cache with the value passed by the caller. This could be
            // from a server mutation, or it could be a streaming response.
            seededCache.data.set(seedKey, seedValue);
          } else {
            if (__DEV__) {
              console.error(
                'The seed argument is not enabled outside experimental channels.',
              );
            }
          }
        }

        const payload = {
          cache: seededCache,
        };
        refreshUpdate.payload = payload;
        return;
      }
    }
    provider = provider.return;
  }
  // TODO: Warn if unmounted?