/**
 * @template T
 */
export class Option<T> {
    /**
     * @template T
     * @param {T} value
     * @returns {Some<T>}
     */
    static some<T_1>(value: T_1): Some<T_1>;
    /** @returns {None} */
    static none(): _None;
    /**
     * @param {(value: T) => Option<T>} fn
     * @param {Option<T>} self
     * @returns {Option<T>}
     */
    static chain(fn: (value: T) => Option<T>, self: Option<T>): Option<T>;
    /**
     * @param {(value: T) => bool} fn
     * @param {Option<T>} self
     * @returns {Option<T>}
     */
    static filter(predicate: any, self: Option<T>): Option<T>;
    /**
     * @template V
     * @param {(value: T) => V} fn
     * @param {Option<T>} self
     * @returns {Option<V>}
     */
    static map<V>(fn: (value: T) => V, self: Option<T>): Option<V>;
    /**
     * @param {Option<T>} other
     * @param {Option<T>} self
     * @returns {Option<T>}
     */
    static alt(other: Option<T>, self: Option<T>): Option<T>;
    /**
     * @param {Option<T>} other
     * @param {Option<T>} self
     * @returns {Option<T>}
     */
    static equals(other: Option<T>, self: Option<T>): Option<T>;
    /**
     * @param {Option<T>} other
     * @param {Option<T>} self
     * @returns {Option<T>}
     */
    static lte(other: Option<T>, self: Option<T>): Option<T>;
    /**
     * @returns {this is Some<T>}
     */
    isSome(): this is Some<T>;
    /**
     * @returns {this is None<T>}
     */
    isNone(): this is _None;
}
/** @template T */
export class Some<T> extends Option<any> {
    /** @param {T} value */
    constructor(value: T);
    /**
     * @param {(value: T) => Option<T>} fn
     * @returns {Option<T>}
     */
    andThen(fn: (value: T) => Option<T>): Option<T>;
    /**
     * @param {Option<T>} other
     * @returns {Option<T>}
     */
    and(other: Option<T>): Option<T>;
    /**
     * @param {Option<T>} other
     * @returns {Option<T>}
     */
    or(_other: any): Option<T>;
    /**
     * @param {() => Option<T>} other
     * @returns {Option<T>}
     */
    orElse(_fn: any): Option<T>;
    /**
     * @template T
     * @param {(value: T) => bool} predicate
     * @returns {Option<T>}
     */
    filter<T_1>(predicate: (value: T_1) => bool): Option<T_1>;
    /**
     * @param {Option<T>} other
     * @returns {bool}
     */
    equals(other: Option<T>): bool;
    /**
     * @param {Option<T>} other
     * @returns {bool}
     */
    lte(other: Option<T>): bool;
    /**
     * @template [V=T]
     * @param {(acc: V, value: T) => V} reducer
     * @param {V} init
     * @returns {V}
     */
    reduce<V = T>(reducer: (acc: V, value: T) => V, init: V): V;
    /**
     * @returns {Option<T>}
     */
    flatten(): Option<T>;
    /**
     * @template V
     * @param {(value: T) => V} fn
     * @returns {Option<V>}
     */
    map<V>(fn: (value: T) => V): Option<V>;
    /**
     * @template V
     * @param {V} _default
     * @param {(value: T) => V} fn
     * @returns {V}
     */
    mapOr<V>(_default: V, fn: (value: T) => V): V;
    /**
     * @template V
     * @param {() => V} _defaultFn
     * @param {(value: T) => V} fn
     * @returns {V}
     */
    mapOrElse<V>(_defaultFn: () => V, fn: (value: T) => V): V;
    /**
     * @template E
     * @param {E} _err
     * @returns {Result<T, E>}
     */
    okOr<E>(_err: E): Result<T, E>;
    /**
     * @template E
     * @template {() => E} F
     * @param {F} _err
     * @returns {Result<T, E>}
     */
    okOrElse<E, F extends () => E>(_err: F): Result<T, E>;
    /**
     * @param {(value: T) => void} fn
     * @returns {this}
     */
    inspect(fn: (value: T) => void): this;
    /**
     * @returns {T}
     * @throws {UnwrapError}
     */
    unwrap(): T;
    /**
     * @param {T} _value
     * @returns {T}
     */
    unwrapOr(_value: T): T;
    /**
     * @param {() => T} _fn
     * @returns {T}
     */
    unwrapOrElse(_fn: () => T): T;
    #private;
}
export const None: _None;
declare class _None extends Option<any> {
    constructor();
    /**
     * @template T
     * @param {Option<T>} _other
     * @returns {Option<T>}
     */
    and<T>(_other: Option<T>): Option<T>;
    /**
     * @template T
     * @template {Option<T>} R
     * @param {(value: T) => R} fn
     * @returns {R}
     */
    andThen<T, R extends Option<T>>(_fn: any): R;
    /**
     * @template T
     * @param {Option<T>} other
     * @returns {Option<T>}
     */
    or<T>(other: Option<T>): Option<T>;
    /**
     * @template T
     * @param {() => Option<T>} other
     * @returns {Option<T>}
     */
    orElse<T>(fn: any): Option<T>;
    /**
     * @template T
     * @param {(value: T) => bool} _predicate
     * @returns {Option<T>}
     */
    filter<T>(_predicate: (value: T) => bool): Option<T>;
    /**
     * @template T
     * @param {Option<T>} other
     * @returns {bool}
     */
    equals<T>(other: Option<T>): bool;
    /**
     * @template T
     * @param {Option<T>} _other
     * @returns {bool}
     */
    lte<T>(_other: Option<T>): bool;
    /**
     * @template T, [V=T]
     * @param {(acc: V, value: T) => V} _reducer
     * @param {V} init
     * @returns {V}
     */
    reduce<T, V = T>(_reducer: (acc: V, value: T) => V, init: V): V;
    /**
     * @template T
     * @template {Option<T>} R
     * @returns {R}
     */
    flatten<T, R extends Option<T>>(): R;
    /**
     * @template V
     * @template {Option<T>} R
     * @param {(value: T) => V} fn
     * @returns {R}
     */
    map<V, R extends Option<T>>(_fn: any): R;
    /**
     * @template V
     * @param {V} defaultValue
     * @param {(value: T) => V} _fn
     * @returns {V}
     */
    mapOr<V>(defaultValue: V, _fn: (value: T) => V): V;
    /**
     * @template V
     * @param {() => V} defaultFn
     * @param {(value: T) => V} _fn
     * @returns {V}
     */
    mapOrElse<V>(defaultFn: () => V, _fn: (value: T) => V): V;
    /**
     * @template T, E
     * @template {Result<T, E>} R
     * @param {E} err
     * @returns {R}
     */
    okOr<T, E, R extends Result<T, E>>(err: E): R;
    /**
     * @template T, E
     * @template {Result<T, E>} R
     * @template {() => E} F
     * @param {F} err
     * @returns {R}
     */
    okOrElse<T, E, R extends Result<T, E>, F extends () => E>(err: F): R;
    /**
     * @template T
     * @param {(value: T) => void} _fn
     * @returns {this}
     */
    inspect<T>(_fn: (value: T) => void): this;
    /**
     * @template T
     * @returns {T}
     * @throws {UnwrapError}
     */
    unwrap<T>(): T;
    /**
     * @param {T} value
     * @returns {T}
     */
    unwrapOr(value: T): T;
    /**
     * @template T
     * @param {() => T} fn
     * @returns {T}
     */
    unwrapOrElse<T>(fn: () => T): T;
}
import { Result } from './result.js';
export {};
//# sourceMappingURL=option.d.ts.map