export declare type Maybe<U> = Just<U> | Nothing<U>;
export declare class Nothing<T> {
    getOrDefault(defaultVal?: T): T | undefined;
    bind<U>(transform: (v: T) => Maybe<U> | U | undefined): Maybe<U>;
    map<U>(transform: (v: T) => U | undefined): Maybe<U>;
}
export declare class Just<T> {
    private val;
    constructor(x: T);
    getOrDefault(defaultVal?: T): T | undefined;
    map<U>(transform: (v: T) => U | undefined): Maybe<U>;
    bind<U>(transform: (v: T) => Maybe<U> | U | undefined): Maybe<U>;
}
export default function Maybe<T>(x: T | undefined): Maybe<T>;