import type { Option } from './option.js';
type MapOr = {
    <Opt extends Option.Any, T extends Option.Type<Opt>>(defaultValue: T, mapFn: (value: T) => T, option: Opt): T;
    <Opt extends Option.Any, T extends Option.Type<Opt>>(defaultValue: T, mapFn: (value: T) => T): (option: Opt) => T;
    <Opt extends Option.Any, T extends Option.Type<Opt>>(defaultValue: T): {
        <Opt extends Option.Any, T extends Option.Type<Opt>>(mapFn: (value: T) => T): (option: Opt) => T;
        <Opt extends Option.Any, T extends Option.Type<Opt>>(mapFn: (value: T) => T, option: Opt): T;
    };
};
/**
 * Applies the provided function to the contained value of `Some`, or returns the provided default value if the `Option`
 * is `None`.
 *
 * @tags option, transform, transform-option, right-biased, unwrap
 */
export declare const mapOr: MapOr;
export {};