/**
 * None
 */
export declare type None = {
    readonly _tag: 'None';
};
/**
 * Some
 */
export declare type Some<T> = {
    readonly _tag: 'Some';
    readonly value: T;
};
/**
 * Option
 */
export declare type Option<T> = None | Some<T>;
/**
 *
 * @returns
 */
export declare function None(): None;
/**
 *
 * @param value
 * @returns
 */
export declare function Some<T>(value: T): Some<T>;
/**
 *
 * @param option
 * @returns
 */
export declare function isNone(option: Option<unknown>): option is None;
/**
 *
 * @param option
 * @returns
 */
export declare function isSome<T>(option: Option<T>): option is Some<T>;
/**
 *
 * @param nullable
 * @returns
 */
export declare function optionFromNullable<T>(nullable: NonNullable<T> | undefined | null): Option<T>;
/**
 *
 * @param option
 * @param mapIfNone
 * @param mapIfSome
 * @returns
 */
export declare function optionFold<TResult, T>(option: Option<T>, mapIfNone: () => TResult, mapIfSome: (value: T) => TResult): TResult;
/**
 *
 * @param either
 * @param mapper
 * @returns
 */
export declare function optionMapSome<TResult, T>(option: Option<T>, mapper: (value: T) => Option<TResult>): Option<TResult>;
/**
 *
 * @param optionArr
 * @returns
 */
export declare function optionArrayMapSome<T>(optionArr: readonly Option<T>[]): readonly T[];
//# sourceMappingURL=option.d.ts.map