declare type HashFunction<T> = (item: T) => string;
interface Conset<T> {
    map: Object;
    order: string[];
    hashFunction: HashFunction<T>;
}
declare const create: <T>(hashFunction: HashFunction<T>, initialItems?: T[]) => Conset<T>;
declare const iter: <T>(conset: Conset<T>) => IterableIterator<T>;
declare const remove: <T>(conset: Conset<T>, item: T) => Conset<T>;
declare const add: <T>(conset: Conset<T>, item: T) => Conset<T>;
declare const contains: <T>(conset: Conset<T>, item: T) => boolean;
declare const getItems: <T>(conset: Conset<T>) => T[];
declare const size: <T>(conset: Conset<T>) => number;
declare const intersect: <T>(smaller: Conset<T>, larger: Conset<T>) => Conset<T>;
declare const copy: <T>(conset: Conset<T>) => Conset<T>;
declare const union: <T>(smaller: Conset<T>, larger: Conset<T>) => Conset<T>;
export { HashFunction, Conset, create, add, remove, contains, getItems, size, iter, copy, intersect, union };