import { AnySchema } from './AnySchema';
export declare class EnumSchema<TReq = true, TNull = false, TType = any> extends AnySchema<TReq, TNull> {
    readonly schema = "enum";
    private allowedValues;
    constructor();
    optional(): EnumSchema<false, TNull, TType>;
    nullable(): EnumSchema<TReq, true, TType>;
    values<T>(values: any[]): EnumSchema<TReq, TNull, T>;
    literal<T extends string>(...values: T[]): EnumSchema<TReq, TNull, T>;
}