export declare class IndexedSet<T> {
    private _items;
    private _itemSet;
    private _indexMap;
    insertAt(index: number, elements: T[]): void;
    private _chunkedInsert;
    delete(element: T): boolean;
    has(element: T): boolean;
    indexOf(element: T): number;
    get(index: number): T | undefined;
    get size(): number;
    [Symbol.iterator](): Iterator<T>;
    clear(): void;
    find(predicate: (element: T) => boolean): T | undefined;
}