/**
 * Deletes a key from the cache and persists the change if the key existed.
 *
 * @async
 * @param {string} key - The key to remove from the cache.
 * @returns {Promise<boolean>} Resolves to `true` if the key was deleted, `false` if it did not exist.
 */
export declare const deleteAsync: (key: string) => Promise<boolean>;