/**
 * Container 函子一样
 */
export declare class Some<T> {
    value: T;
    constructor(value: T);
    static of<U>(value: U): Some<U>;
    map<R>(callback: (arg: T) => R): Some<R>;
}
export declare class Nothing<T> {
    value: T;
    constructor(value: T);
    static of<U>(value: U): Nothing<U>;
    map<R>(callback: (arg: T) => R): this;
}
/**
 * Either 函子
 */
export declare const Either: {
    Some: typeof Some;
    Nothing: typeof Nothing;
};