/** A {@link Map} that can contain multiple, unique, values for the same key. */
declare class SetMultiMap<K, V> extends Map<K, Set<V>> {
    /**
     * Adds a new element with a specified key and value to the SetMultiMap.
     * If an element with the same key already exists, the value will be added to the underlying {@link Set}.
     * If the value already exists in the {@link Set}, it will not be added again.
     *
     * @param {K} key The key to set.
     * @param {V} value The value to add to the SetMultiMap
     * @returns {SetMultiMap<K, V>} The SetMultiMap with the updated key and value.
     */
    set(key: K, value: V): SetMultiMap<K, V>;
    /**
     * Checks if a specific key has a specific value.
     *
     * @param {K} key The key to check.
     * @param {V} value The value to check.
     * @returns {boolean} True if the key has the value, false otherwise.
     */
    hasValue(key: K, value: V): boolean;
    find(key: K, iterator: (value: V) => boolean): V | undefined;
    /**
     * Removes a specific value from a specific key.
     *
     * @param {K} key The key to remove the value from.
     * @param {V | undefined} value The value to remove.
     * @returns {boolean} True if the value was removed, false otherwise.
     */
    deleteValue(key: K, value: V | undefined): boolean;
    get [Symbol.toStringTag](): string;
}

export { SetMultiMap };