That won't really be feasible as we can't merge ts code into your js in a way that works afterwards.

Situations like these are the reason that we have a warning in the docs to commit everything before involving a plugin - then you can use the gif diffs to revert or merge anything that was changed in a way that it broke your code.

It looks like App.vue is replaced with the example template that is appropriate when you create a project but imho has less value when you already have a project. I think that when you apply a plugin afterwards you are more interested in the 'plumping' and less in the examples (at least I was). It would be nice if the plugin could differentiate between the two use cases (initial and afterwards install).

That said, I agree that this is not a bug and that the warning is sufficient.