/**
 * @module "ethpm/types"
 */
export declare type Maybe<T> = T | undefined;
export declare function maybe<T>(t: T | undefined): Maybe<T>;
export declare function lift<T, U>(func: (t: T) => U): (t: Maybe<T>) => U | undefined;
export declare function lift2<T, U, V>(func: (t: T, u: U) => V): (t: Maybe<T>, u: Maybe<U>) => V | undefined;