/**
 * Deep copy given object.
 * It supports
 *  - primitive types (number, string, array)
 *  - Uint8Array
 *  - objects
 *  - Date
 *
 * It may loose type for others...
 *
 * @param T Generic type of target/copied value.
 * @param target Target value to be copied.
 */
export declare const deepCopy: <T>(target: T, hash?: WeakMap<any, any>) => T;