Function getAnnotation

packages/core/src/render3/jit/module.ts:439–467

(type: any, name: string)

}

function getAnnotation<T>(type: any, name: string): T | null {
  let annotation: T | null = null;
  collect(type.__annotations__);
  collect(type.decorators);
  return annotation;

  function collect(annotations: any[] | null) {
    if (annotations) {
      annotations.forEach(readAnnotation);
    }
  }

  function readAnnotation(decorator: {
    type: {prototype: {ngMetadataName: string}; args: any[]};
    args: any;
  }): void {
    if (!annotation) {
      const proto = Object.getPrototypeOf(decorator);
      if (proto.ngMetadataName == name) {
        annotation = decorator as any;
      } else if (decorator.type) {
        const proto = Object.getPrototypeOf(decorator.type);
        if (proto.ngMetadataName == name) {
          annotation = decorator.args[0];
        }
      }
    }
  }
}

/**
 * Keep track of compiled components. This is needed because in tests we often want to compile the