Function composeValidators

packages/forms/src/validators.ts:680–682

(validators: Array<Validator | ValidatorFn>)

 * validator function.
 */
export function composeValidators(validators: Array<Validator | ValidatorFn>): ValidatorFn | null {
  return validators != null ? compose(normalizeValidators<ValidatorFn>(validators)) : null;
}

/**
 * Merges asynchronous validators into a single validator function.