import type { FieldRestrictionTestFunction } from '../FieldRestrictionTest';
/**
 * Validate if a value is valid based on the required restriction value.
 *
 * When a field has the restriction `required: true`, it cannot be `undefined` or be an empty string. If
 * the field is an array it cannot be an empty array (length 0).
 *
 * When a field has the restriction `required: false` then this test will always return as `valid: true`
 * @param rule
 * @param value
 * @returns
 */
export declare const testEmpty: FieldRestrictionTestFunction<boolean>;