/**
 * Utilities for working with collections
 *
 * @packageDocumentation
 */
/** determines if two sets are equal */
export declare function setEqual<T>(first: Set<T>, second: Set<T>): boolean;
/** determines if two sets intersect */
export declare function setIntersect<T>(first: Set<T>, second: Set<T>): boolean;
/**
 * returns a single arbitrary element from the Set, or undefined if empty
 */
export declare function setNext<T>(elems: Set<T>): T | undefined;
/**
 * removes a single arbitrary element from the Set, or undefined if missing
 *
 * @remarks
 * if the set contains undefined, then this doesn't distinguish in output,
 * but will properly remove it.
 */
export declare function setPop<T>(elems: Set<T>): T | undefined;
/**
 * push val onto key list for multimap
 */
export declare function listMultimapPush<K, V>(multimap: Map<K, V[]>, key: K, val: V): void;
/**
 * add val to key set for multimap
 */
export declare function setMultimapAdd<K, V>(multimap: Map<K, Set<V>>, key: K, val: V): void;
/**
 * delete val from key set for multimap
 */
export declare function setMultimapDelete<K, V>(multimap: Map<K, Set<V>>, key: K, val: V): void;