/**
 * cache the value for target and key
 * @param target - target
 * @param key - key
 * @param value - value
 */
export declare function set<T>(target: any[], key: string, value: T): T;
/**
 * get the cached value for target and key
 * @param target - target
 * @param key - key
 */
export declare function get<T>(target: any[], key: string): T | undefined;