import { AbstractType } from "./AbstractType";
import { Req, scalar } from "@huz-com/types";
import { StringTypeOption } from "./index.interfaces";
declare type T = scalar.String;
declare type O = StringTypeOption;
export declare class StringType extends AbstractType<T, O> {
    protected static _ins: StringType;
    /**
     * Returns skeleton instance
     * */
    static ins(): StringType;
    constructor();
    /**
     * Checks is string?
     */
    is(value: scalar.Unknown, opt?: O, req?: Req): boolean;
    /**
     * Converts a value to string
     */
    cast(value: scalar.Unknown, opt?: O, req?: Req): T | null;
}
export {};