import { AbstractSet } from '../abstract-set.js';
import * as immutable from '../hashset.js';
export declare class HashSet<T> extends AbstractSet<T, HashSet<T>> {
    constructor(items?: Set<T>);
    static of<T>(...items: T[]): HashSet<T>;
    static from<T>(values: Iterable<T>): HashSet<T>;
    protected fromArray(array: T[]): HashSet<T>;
    add(elem: T): boolean;
    addAll(xs: Iterable<T>): this;
    subtractAll(xs: Iterable<T>): this;
    remove(elem: T): boolean;
    filterInPlace(p: (item: T) => boolean): this;
    clear(): void;
    addOne(elem: T): this;
    subtractOne(elem: T): this;
    concat(that: Iterable<T>): HashSet<T>;
    intersect(that: AbstractSet<T, any>): HashSet<T>;
    union(that: AbstractSet<T, any>): HashSet<T>;
    get toImmutable(): immutable.HashSet<T>;
}