Multiple modules in single package



I found that a rather short function I use in the unit tests of a package would be useful somewhere else. If I don’t want to make a separate package for it, is it possible to put it in a separate module in the same package?

Simply putting it in src/MiniModule.jl in the same package does not make using MiniModule find it it.


It would need to be a submodule, I think. To get it using MyPkg.MiniModule ain’t so bad.


That’s unfortunate: MiniModule is not really related to MyPkg, other than being useful in its unit tests.

It seems that, there is an implicit 1:1 mapping between modules and packages for many things.


How would you want it to be accessible? As soon as you think about that, it sounds like a julia package.

Packages con be small and minimal. What is the exact issue you are worried about?


Making a package for <10 LOC. But I see your point.


You can also do push!(LOAD_PATH, @__DIR__) in src/Module.jl to make MiniModule findable. Then users can do using Module; using MiniModule


At least if registered it does put additional burden on METADATA maintainers (and on Tamas too).


There was some discussion on this topic here:

I’m really hoping to see this feature before 1.0; I don’t think having to use a separate git repository for every chunk of code that forms a standalone module is really scalable for huge projects.


Sorry for necroing this thread, but I assume that those who replied may be interested.

I think found a Pkg3-compatible solution. Let’s call the package ThePackage and the auxiliary module AuxModule.

  1. Have the auxiliary module in a subdirectory of the main project, eg assets/AuxModule/src/AuxModule.jl.
  2. pkg> activate the main project.
  3. pkg> dev ./assets/AuxModule. This will generate an UUID for it, even if there is no Project.toml file in assets/AuxModule.

Then it appears that when the package is activated again, using AuxModule etc will work fine. One just needs to make sure that the project was activated.

This solves my problem, but I am unsure if it is something I can count on to keep working, or an abuse of the Pkg3 setup. Comments welcome.


I think this is how it’s intended to work, judging by this comment:


Note that my solution is without making AuxModule a submodule.