export declare function bsDefault<T, U>(params: [T, U]): T extends NonNullable<unknown> ? T : U;
declare const _default: abstract new <T, U>() => import("@ember/component/helper").FunctionBasedHelperInstance<{
    Args: {
        Positional: [T, U];
        Named: object;
    };
    Return: T extends {} ? T : U;
}>;
export default _default;