/**
 * @description Immutable version of `Set`.
 * @export
 * @class ImmutableSet
 * @template Type
 * @extends {Set<Readonly<Type>>}
 */
export declare class ImmutableSet<Type> extends Set<Readonly<Type>> {
    constructor(iterable?: Iterable<Type> | null);
    delete(value: Type): boolean;
    clear(): this;
}