opts := []entc.Option{
	entc.Dependency(
		entc.DependencyType(&http.Client{}),
	),
	entc.Dependency(
		entc.DependencyName("Writer"),
		entc.DependencyTypeInfo(&field.TypeInfo{
			Ident:   "io.Writer",
			PkgPath: "io",
		}),
	),
}
if err := entc.Generate("./schema", &gen.Config{}, opts...); err != nil {
	log.Fatalf("running ent codegen: %v", err)
}

func Example_EntcPkg() {
	client, err := ent.Open(
		"sqlite3",
		"file:ent?mode=memory&cache=shared&_fk=1",
		ent.Writer(os.Stdout),
		ent.HTTPClient(http.DefaultClient),
	)
	if err != nil {
		log.Fatalf("failed opening connection to sqlite: %v", err)
	}
	defer client.Close()
	// A usage example of using the injected dependencies in the generated builders.
	client.User.Use(func(next ent.Mutator) ent.Mutator {
		return hook.UserFunc(func(ctx context.Context, m *ent.UserMutation) (ent.Value, error) {
			_ = m.HTTPClient
			_ = m.Writer
			return next.Mutate(ctx, m)
		})
	})
	// ...
}