Function getAsyncClassMetadataFn

packages/core/src/render3/metadata.ts:32–41

(
  type: Type<unknown>,
)

 * dependencies. Otherwise - this function returns `null`.
 */
export function getAsyncClassMetadataFn(
  type: Type<unknown>,
): (() => Promise<Array<Type<unknown>>>) | null {
  const componentClass = type as any; // cast to `any`, so that we can read a monkey-patched field
  if (componentClass[ASYNC_COMPONENT_METADATA_FN] === ASYNC_METADATA_LOADED) {
    return null;
  }

  return componentClass[ASYNC_COMPONENT_METADATA_FN] ?? null;
}

/**
 * Checks if a given component has async metadata.