This is something I've been working on a bit myself. Figuring out which files change is relatively easy (as you've demonstrated). Figuring out what the impact

This is something I've been working on a bit myself. Figuring out which files change is relatively easy (as you've demonstrated). Figuring out what the impact of that is quite hard in non-compiled languages (tools like Maven, Buck, Bazel, etc do this well for compiled languages). I.e. In a repo which is primarily JavaScript, I can get the list of changed files, and hopefully have unit test files which are obviously linear to those. However, knowing if these are depended on by other files/modules (at some depth) is much harder. Same for integration tests -- which of these are related?