Function mergeValidators

packages/forms/src/validators.ts:718–723

(controlValidators: V | V[] | null, dirValidator: V)

 * validators as an array.
 */
export function mergeValidators<V>(controlValidators: V | V[] | null, dirValidator: V): V[] {
  if (controlValidators === null) return [dirValidator];
  return Array.isArray(controlValidators)
    ? [...controlValidators, dirValidator]
    : [controlValidators, dirValidator];
}

/**
 * Retrieves the list of raw synchronous validators attached to a given control.