/**
 * Maps keys to a set of values
 * @example
 * ```ts
 * const m = new SetMultiMap([['a',1],['a',2]])
 * m.add('a',3)
 * m.has('a',1) // => true
 * m.has('a',2) // => true
 * m.has('a',3) // => true
 * m.has('a',4) // => false
 * ```
 */
export declare class SetMultiMap<K, V> implements Iterable<[K, V]> {
    private map;
    constructor(entries?: Iterable<[K, V]>);
    get size(): number;
    get(key: K): ReadonlySet<V> | undefined;
    add(key: K, value: V): this;
    clear(): void;
    delete(key: K, value: V): boolean;
    deleteKey(key: K): boolean;
    has(key: K, value: V): boolean;
    hasKey(key: K): boolean;
    [Symbol.iterator](): IterableIterator<[K, V]>;
    entries(): IterableIterator<[K, V]>;
    values(): IterableIterator<V>;
    keys(): IterableIterator<K>;
}
export declare function isSetMultiMap<K, V>(x: unknown): x is SetMultiMap<K, V>;
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