import validator from "validator";
import { Field } from "../field";
import { IIsString } from "./is-string";
/** Validate.isAlpha options. */
export interface IIsAlpha extends IIsString {
    /** Locale used by validator, defaults to en-GB. */
    locale?: validator.AlphaLocale;
}
/** Wrapper for validator isAlpha. */
export declare function isAlpha(value?: string, options?: IIsAlpha): string;
export declare class AlphaField extends Field<string> {
    protected readonly options: IIsAlpha;
    constructor(options?: IIsAlpha);
    validate(value: string): string;
}