import { EventEmitter } from "events";

export class CacheEntry<T> extends EventEmitter {
    get(callback?: (err: Error, result: T) => void): T | undefined;
    set(value: T): void;
    clear(): void;
}

export class Cache {
    /**
     * Clear cache entries prefix matching given key
     * @param key Key prefix of cache entry to clear
     */
    clear(key?: string): void;

    /**
     * Retrieve cache entry, or create if not exists
     * @param key Key of cache entry
     */
    get<T>(key?: string): CacheEntry<T>;
}