sbt-rjs hangs

[roti]

I had a weird behaviour in my environment, namely the build simply hanged (did not finish, no CPU usage) using tasks assets or run.
My environment is Play 2.6, sbt 1.2.8, sbt-rjs 1.0.10. I can provide a test project if needed.

Initially I thought it's a compatibility problem, tried to build sbt-rjs against newer stuff, like sbt 1.0.1, js-engine 1.2.3, but with no success.

I discovered that the problem was actually this line in my build.sbt:

pipelineStages in Assets := Seq(rjs)

I have no clue why this happens, tried to look at some debug logs (starting sbt with sbt -debug), and did not find anything. Apparently when running assets, sbt first executes update and then hangs. It may be that the cause is not in sbt-rjs.

[marcospereira]

Is this reproducible? Can you take a thread dump when it hangs?

[roti]

sbt-rjs-test.zip
Here's a test project where it occurs everytime you call assets or run.