import type { Result } from "./Result";
export declare type Option<T> = None<T> | Some<T>;
export interface OptionMethods<T> {
    map: <U>(f: (x: T) => U) => Option<U>;
    chain: <U>(f: (x: T) => Option<U>) => Option<U>;
    do: (f: (x: T) => void) => Option<T>;
    runAsync: <U>(f: (x: T) => Promise<U>) => Promise<U>;
    get: (defaultValue?: T) => T | undefined;
    isSome: boolean;
    isNone: boolean;
}
export interface Some<T> extends OptionMethods<T> {
    type: 'option-some';
    value: T;
}
export interface None<T> extends OptionMethods<T> {
    type: 'option-none';
}
export declare const some: <T>(value: T) => Option<T>;
export declare function none<T>(): Option<T>;
export declare const fromResult: <T, E>(r: Result<T, E>) => Option<T>;
export declare const fromNullable: <T>(value: T | null | undefined) => Option<T>;