/**
 * Appends to a `string` map value.
 *
 * @param map - a map
 * @param key - the map key
 * @param value - the value to append
 */
declare function appendToValue<K>(map: Map<K, string>, key: K, value: string): void;
/**
 * @param map - a map
 * @returns the map sorted by its keys
 */
declare function sortByKeys<K, V>(map: Map<K, V>): Map<K, V>;
export { appendToValue, sortByKeys };