export declare function mergeSets<T>(a: ReadonlySet<T>, b: ReadonlySet<T>): Set<T>;
export declare function areSetsEqual<T>(a: ReadonlySet<T>, b: ReadonlySet<T>): boolean;
export declare function subtractSets<T>(a: ReadonlySet<T>, b: ReadonlySet<T>): Set<T>;
export declare function setsOverlap<T>(a: ReadonlySet<T>, b: ReadonlySet<T>): boolean;