Interface AssetConfigurator<Assets, AssetGroups>

interface AssetConfigurator<
    Assets extends Record<string, unknown> = {},
    AssetGroups extends string = never,
> {
    add<K extends string, T>(
        key: K,
        loader: () => Promise<T>,
    ): AssetConfigurator<Assets & Record<K, T>, AssetGroups>;
    addGroup<
        GN extends string,
        T extends Record<string, () => Promise<unknown>>,
    >(
        groupName: GN,
        assets: T,
    ): AssetConfigurator<
        Assets & { [K in string
        | number
        | symbol]: Awaited<ReturnType<T[K]>> },
        AssetGroups | GN,
    >;
    addWithConfig<K extends string, T>(
        key: K,
        definition: AssetDefinition<T>,
    ): AssetConfigurator<Assets & Record<K, T>, AssetGroups>;
}