Class CustomValidator

packages/forms/test/reactive_integration_spec.ts:73–88

// Produces a new @Directive (with a given selector) that represents a validator class.
function createValidatorClass(selector: string) {
  @Directive({
    selector,
    providers: [
      {
        provide: NG_VALIDATORS,
        useClass: forwardRef(() => CustomValidator),
        multi: true,
      },
    ],
    standalone: false,
  })
  class CustomValidator implements Validator {
    validate(control: AbstractControl) {
      return null;
    }
  }
  return CustomValidator;
}