Function mergeErrors

packages/forms/src/validators.ts:623–630

(arrayOfErrors: (ValidationErrors | null)[])

}

function mergeErrors(arrayOfErrors: (ValidationErrors | null)[]): ValidationErrors | null {
  let res: {[key: string]: any} = {};
  arrayOfErrors.forEach((errors: ValidationErrors | null) => {
    res = errors != null ? {...res!, ...errors} : res!;
  });

  return Object.keys(res).length === 0 ? null : res;
}

type GenericValidatorFn = (control: AbstractControl) => any;