How to use different compression/mangle settings in dev vs prod?

[dwickern]

I use the concatenation feature in both development (sbt run) and production (sbt dist). I want to disable compression and mangling in development and enable them in production.

I expected this to work:

pipelineStages in Assets := Seq(uglify)
UglifyKeys.compress in Assets := false
UglifyKeys.mangle in Assets := false
UglifyKeys.compress := true
UglifyKeys.mangle := true

But the plugin doesn't scope compress and mangle so they are always true.