import { MessageFunctionType, Result } from '../types';
export interface IsIntStringErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_INT_STRING_ERRORS: IsIntStringErrors;
/**
 * Tests whether the `target` string is an int
 *
 * ### Example
 * ```
 * expect(isIntString('13').value).toBeTruthy()
 * ```
 *
 * @param target The target string
 * @param options The options
 */
export declare function isIntString(target: string, options: any): Result<boolean | undefined>;