import { Either, Left, Right } from "./Either";
export declare type Option<T> = Either<T, null>;
export declare type Some<T> = Left<T>;
export declare type None = Right<null>;
declare function isSome<T>(option: Option<T>): option is Some<T>;
declare function assertSome<T>(option: Option<T>, message?: string): asserts option is Some<T>;
declare function isNone(option: Option<unknown>): option is None;
declare function assertNone(option: Option<unknown>, message?: string): asserts option is None;
declare type Match<T, IfSome, IfNone> = {
    readonly some: (value: T) => IfSome;
    readonly none: () => IfNone;
};
export declare const Option: {
    is: {
        some: typeof isSome;
        none: typeof isNone;
    };
    assert: {
        some: typeof assertSome;
        none: typeof assertNone;
    };
    of: {
        some: <T>(value: T) => Some<T>;
        none: () => None;
    };
    to: {
        someValue: <T_1>(option: Some<T_1>) => T_1;
    };
    match: <T_2, IfSome, IfNone>(option: Option<T_2>, match: Match<T_2, IfSome, IfNone>) => IfSome | IfNone;
};
export {};