/**
 * Links an arrow function to an LRU cache. The function converts
 * a string to a value of type T. The string itself is used as
 * the cache key.
 *
 * Examples:
 *  * Caching a number or date pattern. The cache key is the string
 *    representation of the pattern.
 *  * Caching any object that is expensive to create, where the cache
 *    key identifies the type of object to cache.
 *
 * @public
 */
export declare class Cache<T> {
    private builder;
    private storage;
    constructor(builder: (s: string) => T, capacity: number);
    /**
     * Return the number of items stored in the cache.
     *
     * @public
     */
    size(): number;
    /**
     * Fetch an item from the cache. If the item is not found,
     * it will be built and stored in the cache.
     *
     * @public
     */
    get(raw: string): T;
}