import { Field } from "../field";
import { IIsString } from "./is-string";
/** Wrapper for validator isAscii. */
export declare function isAscii(value?: string, options?: IIsString): string;
export declare class AsciiField extends Field<string> {
    protected readonly options: IIsString;
    constructor(options?: IIsString);
    validate(value: string): string;
}