export default interface CacheInterface {
    /**
     * Fetches a value from the cache.
     *
     * @param key The unique key of this item in the cache.
     * @param defaultValue Default value to return if the key does not exist.
     *
     * @return T The value of the item from the cache, or $default in case of cache miss.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    get<T>(key: string, defaultValue?: T): T | undefined

    /**
     * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
     *
     * @param key The key of the item to store.
     * @param value The value of the item to store. Must be serializable.
     * @param {null|number} ttl The TTL value of this item. If no value is sent and
     *                          the driver supports TTL then the library may set a default value
     *                          for it or let the driver take care of that.
     *
     * @return bool True on success and false on failure.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    set<T>(key: string, value: T, ttl?: number): boolean

    /**
     * Delete an item from the cache by its unique key.
     *
     * @param key The unique cache key of the item to delete.
     *
     * @return True if the item was successfully removed. False if there was an error.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    delete(key: string): boolean

    /**
     * Wipes clean the entire cache's keys.
     *
     * @return boolean True on success and false on failure.
     */
    clear(): boolean

    /**
     * Obtains multiple cache items by their unique keys.
     *
     * @param keys A list of keys that can obtained in a single operation.
     * @param defaultValues $default Default value to return for keys that do not exist.
     *
     * @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $keys is neither an array nor a Traversable,
     *   or if any of the $keys are not a legal value.
     */
    getMultiple<T>(keys: Array<string>, defaultValues?: Array<T>): Record<string, T>

    /**
     * Persists a set of key => value pairs in the cache, with an optional TTL.
     *
     * @param values A list of key => value pairs for a multiple-set operation.
     * @param ttl Optional. The TTL value of this item. If no value is sent and
     *            the driver supports TTL then the library may set a default value
     *            for it or let the driver take care of that.
     *
     * @return bool True on success and false on failure.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $values is neither an array nor a Traversable,
     *   or if any of the $values are not a legal value.
     */
    setMultiple<T>(values: Record<string, T>, ttl?: number): boolean

    /**
     * Deletes multiple cache items in a single operation.
     *
     * @param keys A list of string-based keys to be deleted.
     *
     * @return bool True if the items were successfully removed. False if there was an error.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $keys is neither an array nor a Traversable,
     *   or if any of the $keys are not a legal value.
     */
    deleteMultiple(keys: Array<string>): boolean

    /**
     * Determines whether an item is present in the cache.
     *
     * NOTE: It is recommended that has() is only to be used for cache warming type purposes
     * and not to be used within your live applications operations for get/set, as this method
     * is subject to a race condition where your has() will return true and immediately after,
     * another script can remove it, making the state of your app out of date.
     *
     * @param key The cache item key.
     *
     * @return bool
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    has(key: string): boolean
}