"node-cache": "5.1.2",

declare class NodeCache extends events.EventEmitter {
	/** container for cached data */
	data: Data;

	/** module options */
	options: Options;

	/** statistics container */
	stats: Stats;

	/** constructor */
	constructor(options?: Options);

	/**
	 * get a cached key and change the stats
	 *
	 * @param key cache key
	 * @returns The value stored in the key
	 */
	get<T>(
		key: Key
	): T | undefined;

	/**
	 * get multiple cached keys at once and change the stats
	 *
	 * @param keys an array of keys
	 * @returns an object containing the values stored in the matching keys
	 */
	mget<T>(
		keys: Key[]
	): { [key: string]: T };

	/**
	 * set a cached key and change the stats
	 *
	 * @param key cache key
	 * @param value A element to cache. If the option `option.forceString` is `true` the module trys to translate
	 * it to a serialized JSON
	 * @param ttl The time to live in seconds.
	 */
	set<T>(
		key: Key,
		value: T,
		ttl: number | string
	): boolean;

	set<T>(
		key: Key,
		value: T
	): boolean;

	/**
	 * set multiple cached keys at once and change the stats
	 *
	 * @param keyValueSet an array of object which includes key,value and ttl
	 */
	mset<T>(
		keyValueSet: ValueSetItem<T>[]
	): boolean;

	/**
	 * remove keys
	 * @param keys cache key to delete or a array of cache keys
	 * @param cb Callback function
	 * @returns Number of deleted keys
	 */
	del(
		keys: Key | Key[]
	): number;

	/**
	 * get a cached key and remove it from the cache.
	 * Equivalent to calling `get(key)` + `del(key)`.
	 * Useful for implementing `single use` mechanism such as OTP, where once a value is read it will become obsolete.
	 *
	 * @param key cache key
	 * @returns The value stored in the key
	 */
	take<T>(
		key: Key
	): T | undefined;
					  
	/**
	 * reset or redefine the ttl of a key. If `ttl` is not passed or set to 0 it's similar to `.del()`
	 */
	ttl(
		key: Key,
		ttl: number
	): boolean;

	ttl(
		key: Key
	): boolean;

	getTtl(
		key: Key,
	): number|undefined;

	getTtl(
		key: Key
	): boolean;

	/**
	 * list all keys within this cache
	 * @returns An array of all keys
	 */
	keys(): string[];

	/**
	 * get the stats
	 *
	 * @returns Stats data
	 */
	getStats(): Stats;

	/**
	 * Check if a key is cached
	 * @param key cache key to check
	 * @returns Boolean indicating if the key is cached or not
	 */
	has(key: Key): boolean;

	/**
	 * flush the whole data and reset the stats
	 */
	flushAll(): void;

	/**
	 * This will clear the interval timeout which is set on checkperiod option.
	 */
	close(): void;

	/**
	 * flush the stats and reset all counters to 0
	 */
	flushStats(): void;
}