/**
 * A map that creates a reverse entry for each item that gets set.
 * @export
 * @template T The key type.
 * @template U The value type.
 * @extends Map<T|U, T|U>
 */
export declare class ReversibleMap<T, U> {
    private _map;
    constructor(entries?: Array<[T, U]>);
    set(key: T | U, value: T | U): this;
    get(key: T | U): T | U | undefined;
    has(key: T | U): boolean;
    delete(key: T): boolean;
}