/**
 * Interface for Storefront-internal caching mechanism.
 * Used for the `UnstorageCache` with `cached()`.
 */
export interface Cache {
    /**
     * Sets a value in the cache.
     *
     * @param key The key to store the value under.
     * @param value The value to store in the cache.
     * @param ttl Time-to-live in milliseconds.
     * @param tags Optional array of tags to associate with the cached value.
     *
     * @returns A promise that resolves when the value is set.
     */
    set: (key: string, value: any, ttl: number, tags?: string[]) => Promise<void>;
    /**
     * Retrieves a value from the cache.
     *
     * @param key The key of the cached value.
     *
     * @returns A promise that resolves with the cached value or rejects if not found.
     */
    get: (key: string) => Promise<any>;
    /**
     * Checks if a key exists in the cache.
     *
     * @param key The key to check.
     *
     * @returns A promise that resolves with `true` if the key exists, `false` otherwise.
     */
    has: (key: string) => Promise<boolean>;
    /**
     * Purges cached values associated with specific tags.
     *
     * @param tags An array of tags to purge.
     *
     * @returns A promise that resolves when the tags are purged.
     */
    purgeTags: (tags: string[]) => Promise<void>;
    /**
     * Purges cached values by their keys.
     *
     * @param keys An array of keys to purge.
     *
     * @returns A promise that resolves when the keys are purged.
     */
    purgeKeys: (keys: string[]) => Promise<void>;
    /**
     * Purges all cached values.
     *
     * @returns A promise that resolves when the cache is cleared.
     */
    purgeAll: () => Promise<void>;
}