RequireJS Isolation for WebJars in Subprojects

[michaelahlers]

I'm trying to use the RequireJS support in subprojects, and I've run into a couple snags.

To start, org.webjars.play.RequireJS assumes the reverse router will live in a controllers package. I was able to come up with a copy that parameterizes that package name. However, I ran into another problem afterwards.

To prove my solution, I had one subproject's build.sbt depend on version X of a library, and the other subproject depend on version Y. Both end up loading version Y (the highest lexigraphically) as org.webjars.WebJarAssetLocator makes no distinction by project. Worse, if I remove the dependency from either project, both still have access.

My guess is this isn't easily solvable with Play's classloading (i.e., I can't spot any straight-forward way to give WebJarAssetLocator a kind of scope for discovery). That said, if this team has any ideas that could make this possible, I'm all ears.

If it'll help, I'll be happy to assemble a sample project.

[jamesward]

Hmm... This is gonna be tricky. In the meantime you can pretty easily manually do what org.webjars.play.RequireJS is doing. It is basically just:

<script>
@Html(org.webjars.RequireJS.getSetupJavaScript(routes.WebJarAssets.at("")))
</script>

<script data-main="/assets/index" src="@routes.WebJarAssets.at(WebJarAssets.locate("require.min.js"))"></script>

Let me know if that helps.

[michaelahlers]

Thanks for the tip, @jamesward! I wasn't able to get that approach working, but I only took a quick stab and I've got to switch gears now (I'll circle back later). I'm guessing this issue might shake out if there ends up being a well-engineered solution to the latter. On that note, would you like a Gist of my project?

[jamesward]

Sure! A simple reproducible project will definitely help us get this figured out.

[scaryroy]

Hi! I'm just a few months into play & scala, and I'm experiencing this problem.

i am quite interested in how you got it working @michaelahlers!

Currently, in a main.scala.html, it looks like:

@Html(org.webjars.play.RequireJS.setup("javascripts/app"))

And in a subproject.routes, it looks like:

GET     /webjars/*file              controllers.WebJarAssets.at(file)

both of which gives me an error. Some pointers would be nice =)

Thanks in advance!