The two applications have common modules. How to push changes to git and not download too much?

Question

git

Now we are working on one application, the functionality is divided into modules. There was a need for a second application, which should use some of the modules from the first.
In the case of the first application, a repository has now been created, where each programmer has his own branch, then everything is merged into the main one.
It is planned to add another main one for the second application.
Is it possible to somehow make it so that when merging into one branch, some files are not loaded, but are loaded into another?
Or do different commits to different branches?

Answer 1

Check them out as dependencies and install via composer