world: {
                player: {
                    $: { where: { id: { $eq: "1" }, name: { $eq: "Alice" } } },
                },
            },
            universe: {
                galaxy: {
                    $: {
                        where: { name: { $is: "Milky Way" } },
                    },
                },
            },

        const query: QueryType<MockSchemaType> = new QueryBuilder()
            .namespace("world", world => world
                .model("player", player => player
                    .eq("id", "1")
                    .eq("name", "Alice")
                )
            )
            .namespace("universe", universe => universe
                .model("galaxy", galaxy => galaxy
                    .is("name", "Milky Way")
                )
            )
            .build();