tryToClaimNextHydratableFormMarkerInstance() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberHydrationContext.js lines 514–540

export function tryToClaimNextHydratableFormMarkerInstance(
  fiber: Fiber,
): boolean {
  if (!isHydrating) {
    return false;
  }
  if (nextHydratableInstance) {
    const markerInstance = canHydrateFormStateMarker(
      nextHydratableInstance,
      rootOrSingletonContext,
    );
    if (markerInstance) {
      // Found the marker instance.
      nextHydratableInstance = getNextHydratableSibling(markerInstance);
      // Return true if this marker instance should use the state passed
      // to hydrateRoot.
      // TODO: As an optimization, Fizz should only emit these markers if form
      // state is passed at the root.
      return isFormStateMarkerMatching(markerInstance);
    }
  }
  // Should have found a marker instance. Throw an error to trigger client
  // rendering. We don't bother to check if we're in a concurrent root because
  // useActionState is a new API, so backwards compat is not an issue.
  throwOnHydrationMismatch(fiber);
  return false;
}