Unstaged files after running

[Legioth]

One the 2.0 branch, run mvn jetty:run and shut it down.

After this, git status reports an untracked src/main/webapp/build/ directory that contains a stats.json file. I would expect no untracked files to appear by running the project.

I would recommend putting that file somewhere inside /target so that it's automatically ignored. As an alternative, the file could also be listed in .gitignore, but I see that as a less user-friendly option since stats.json is really just an implementation detail that a typical user never needs to see. If only adding it to .gitignore, then mvn clean should also be updated to remove the file.

[SomeoneToIgnore]

The issue is caused by the fact that there are two ways the Flow app can create the webpack config: either through the flow-maven-plugin (and this case works fine) or through the flow-server in DevModeInitializer.

As discussed with the team, having the frontend tools' files generation logic in flow-server is a no-go and this logic should be moved into flow-maven-plugin entirely.
This will be done via https://github.com/vaadin/flow/issues/5452 and should fix this issue.