export declare function nullish<A = unknown, B = unknown>([that, fallback]: [A, B]): A | B;
declare const _default: abstract new <A = unknown, B = unknown>() => import("@ember/component/helper").FunctionBasedHelperInstance<{
    Args: {
        Positional: [A, B];
        Named: import("@ember/component/helper").EmptyObject;
    };
    Return: A | B;
}>;
export default _default;
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