import { ArrayIterable } from './array-iterable.js';
import { ArrayBuffer, Collection } from './collection.js';
export declare abstract class AbstractSet<T, S extends AbstractSet<T, any>> extends ArrayIterable<T, S> {
    protected readonly items: Set<T>;
    protected constructor(items: Set<T>);
    contains(item: T): boolean;
    get toArray(): Array<T>;
    get toCollection(): Collection<T>;
    get toSet(): Set<T>;
    get isEmpty(): boolean;
    get size(): number;
    get toBuffer(): ArrayBuffer<T>;
}