import type { Option } from './option.js';
type UnwrapOrElse = {
    <Opt extends Option.Any, Fn extends () => Option.Type<Opt>>(mapFn: Fn): (option: Opt) => Option.Type<Opt>;
    <Opt extends Option.Any, Fn extends () => Option.Type<Opt>>(mapFn: Fn, option: Opt): Option.Type<Opt>;
};
/**
 * Extract value from a `Some` or from a fallback `() => value` if a `None`
 *
 * @tags result, unwrap, transform, transform-result, errors, left-biased
 * @see https://doc.rust-lang.org/core/result/enum.Result.html#method.unwrap_or_else
 */
export declare const unwrapOrElse: UnwrapOrElse;
export {};