/**
 * Attaches a static `builder()` factory to a class, exposing a fluent setter
 * for every own property of a default-constructed instance.
 *
 * @example
 * @Builder
 * class Config {
 *   host = '';
 *   port = 0;
 * }
 *
 * const cfg = (Config as any).builder().host('localhost').port(8080).build();
 */
export declare function Builder<T extends {
    new (...args: any[]): {};
}>(target: T): T;