interface IOption<T> extends ArrayLike<T>, Iterable<T> {
    isSome(): this is Some<T>;
    isNone(): this is None<T>;
    map<U>(f: (value: T) => U): Option<U>;
    flatMap<U>(f: (value: T) => Option<U>): Option<U>;
    orDefault(value: T): T;
    orBuild(f: () => T): T;
    orThrow<E>(f?: () => E): T;
    orNull(): T | null;
    orUndefined(): T | undefined;
    takeIf(f: (value: T) => boolean): Option<T>;
    takeIfNotNull(): Option<NonNullable<T>>;
    ifPresent(f: (value: T) => void): Option<T>;
    ifAbsent(f: () => void): Option<T>;
    and<U>(other: Option<U>): Option<T | U>;
    or<U>(other: Option<U>): Option<T | U>;
    readonly length: 0 | 1;
    [index: number]: T;
    [Symbol.iterator]: () => Iterator<T>;
}
declare class Some<T> implements IOption<T> {
    readonly value: T;
    constructor(value: T);
    isSome(): this is Some<T>;
    isNone(): this is None<T>;
    flatMap<U>(f: (value: T) => Option<U>): Option<U>;
    map<U>(f: (value: T) => U): Option<U>;
    orDefault(value: T): T;
    orBuild(f: () => T): T;
    orThrow<E>(f?: () => E): T;
    orNull(): T | null;
    orUndefined(): T | undefined;
    takeIf(f: (value: T) => boolean): Option<T>;
    takeIfNotNull(): Option<NonNullable<T>>;
    ifPresent(f: (value: T) => void): Option<T>;
    ifAbsent(f: () => void): Option<T>;
    and<U>(other: Option<U>): Option<T | U>;
    or<U>(other: Option<U>): Option<T | U>;
    readonly length = 1;
    [index: number]: T;
    0: T;
    [Symbol.iterator]: () => Iterator<T>;
}
declare class None<T = never> implements IOption<T> {
    static readonly instance: None<never>;
    private constructor();
    isSome(): this is Some<T>;
    isNone(): this is None<T>;
    flatMap<U>(f: (value: T) => Option<U>): Option<U>;
    map<U>(f: (value: T) => U): Option<U>;
    orDefault(value: T): T;
    orBuild(f: () => T): T;
    orThrow<E>(f?: () => E): T;
    orNull(): T | null;
    orUndefined(): T | undefined;
    takeIf(f: (value: T) => boolean): Option<T>;
    takeIfNotNull(): Option<NonNullable<T>>;
    ifPresent(f: (value: T) => void): Option<T>;
    ifAbsent(f: () => void): Option<T>;
    and<U>(other: Option<U>): Option<T | U>;
    or<U>(other: Option<U>): Option<T | U>;
    readonly length = 0;
    [index: number]: T;
    [Symbol.iterator]: () => Iterator<T>;
}
export declare type Option<T> = Some<T> | None<T>;
export declare function none<T = never>(): Option<T>;
export declare function some<T>(value: T): Option<T>;
export declare function nonNull<T>(nullable: T): Option<NonNullable<T>>;
export {};