export default class Set<E = any> {
    constructor(array?: E[] | Set<E>);
    private _length;
    readonly length: number;
    private _array;
    readonly array: Array<E>;
    static addArray<E>(source: Array<E>, destination: Set<E>): void;
    static addSet<E>(source: Set<E>, destination: Set<E>): void;
    contains(element: E): boolean;
    indexOf(element: E): number;
    get(ind: number): E;
    add(element: E): number;
    addAll(collection: Set<E> | Array<E>): void;
    remove(element: E): boolean;
}