import Intl, { Messages } from 'intl-ts';
export declare type ValidatorMessage<T extends Messages, P extends any[]> = {
    [K in keyof T]: Intl<T>[K] extends (...args: P) => string ? K : never;
}[keyof T];
/**
 * A validator interface.
 */
export default interface Validator<T extends Messages = any, P extends any[] = any[]> {
    readonly params: P;
    validate: (value: string) => ValidatorMessage<T, P> | undefined;
}
/**
 * A validator based on regular expression.
 */
export declare class RegExpValidator<T extends Messages, P extends any[]> implements Validator<T, P> {
    private readonly regExp;
    private readonly msgKey;
    readonly params: P;
    constructor(regExp: RegExp, msgKey: ValidatorMessage<T, P>, params: P);
    validate(value: string): ValidatorMessage<T, P> | undefined;
}