export declare function intersects<T>(a: Set<T>, b: Set<T>): boolean;
export declare function difference<T>(a: Set<T>, b: Set<T>): Set<T>;
export declare function merge<T>(dest: Set<T>, ...iterables: Iterable<T>[]): void;
export declare function remove<T>(dest: Set<T>, ...iterables: Iterable<T>[]): void;