Function verifyDirectivesHaveSelector

packages/core/src/render3/jit/module.ts:322–328

* Checks that a directive declared in the module actually has a selector. * * This does the following: * 1. Reads the directive definition off the type. This also finds a definition that the type * inherited from a base class. * 2. Skips the check if the type is really a component

(type: Type<any>)

   *    user to add one.
   */
  function verifyDirectivesHaveSelector(type: Type<any>): void {
    type = resolveForwardRef(type);
    const def = getDirectiveDef(type);
    if (!getComponentDef(type) && !getPipeDef(type) && def && def.selectors.length == 0) {
      errors.push(`Directive ${stringifyForError(type)} has no selector, please add it!`);
    }
  }

  function verifyNotStandalone(type: Type<any>, moduleType: NgModuleType): void {
    type = resolveForwardRef(type);