import { MessageFunctionType, Result } from '../types';
export interface IsLengthErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_LENGTH_ERRORS: IsLengthErrors;
/**
 * Tests whether the `target` string length is valid
 *
 * ### Example
 * ```
 * expect(isLength('abcd', 2).value).toBeTruthy()
 * ```
 * @param target The target
 * @param min The minimum length
 * @param max The maximum length - Infinity if not defined
 */
export declare function isLength(target: string, min?: number, max?: number): Result<boolean | undefined>;