Opt-out module if we don't need it

[thanhlmm]

Hi, we have used react-query and it's fantastic tool ever created.

After I checked the bundle packages, I saw some modules maybe we can opt-out because I don't actually use it in the project. So my question is, can we have a way to opt-out those modules?

[TkDodo]

those are mostly internal module that are used implicitly.

[thanhlmm]

My used case is, I don't want to care about refetchOnReconnect and onlineManager. So I want to opt it out

[thanhlmm]

I also sê that Observer is rarely have use cases

[TkDodo]

Every useQuery call creates an observer...