Function asyncValidator

packages/forms/test/util.ts:40–46

(expected: string, timeouts = {})

 *     that value
 */
export function asyncValidator(expected: string, timeouts = {}): AsyncValidatorFn {
  return (control: AbstractControl) => {
    const timeout = (timeouts as any)[control.value] ?? 0;
    const result = control.value != expected ? {async: true} : null;
    return createValidationPromise(result, timeout);
  };
}

/**
 * Returns an async validator that emits null or a custom error after a specified delay.