/**
 * @public
 * Used with maps that store sets. Where a set exists for a given key the value will be added to that set, otherwise a new set will be created containing the value.
 * @param map - The `Map` to check. May be modified.
 * @param key - The key to lookup in `map`.
 * @param value - The value to add.
 *
 * @remarks
 * See {@link (mapAddToSet: 1)}.
 */
export declare function mapAddToSet<TKey, TValue>(map: Map<TKey, Set<TValue>>, key: TKey, value: TValue): void;
/**
 * @public
 * {@inheritDoc (mapAddToSet: 1)}
 */
export declare function mapAddToSet<TKey extends object, TValue>(map: WeakMap<TKey, Set<TValue>>, key: TKey, value: TValue): void;
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