`sbt test` doesn't seem to update new JS files into`target/web/web-modules/test/webjars/lib/web`

[tanin47]

I'm making browser tests on a Play project. I've noticed that, when I update a JS file, the test doesn't get the new updated JS file.

After digging in a bit, it seems the JS file is copied into target/web/web-modules/test/webjars/lib/web, and it is never updated again even if the JS file is updated.

Now if I delete the JS file in target/web/web-modules/test/webjars/lib/web and re-run, then it works because the updated JS file is copied.

I wonder if there's a setting I can set to fix this.

[tanin47]

It works after switching to sbt-js-engine. No idea why. There is something special about it.