Cross build for Scala.js 0.6.x and 1.x

[ghost]

see https://www.scala-js.org/news/2018/02/01/announcing-scalajs-1.0.0-M3/, esp the tips on cross-building.

Also of interest may be sbt-dynscalajs, but read the disclaimers first.

This task may be worth doing in conjunction #1549 as there are (potentially) some overlaps with the new cross project setup

[kailuowang]

maybe we should consider adding this support to sbt-catalysts and start using it in cats?

[ghost]

Quick update on this:

This change requires the change to the newer crossproject. Coupled with that, I recently did a PR for SBT that introduces composite projects - see sbt/sbt#3042 and sbt/sbt#4056

So I'm waiting for sbt 1.2, that hopefully will be out soon

[randm-ch]

@BennyHill SBT 1.2.0-M1 is out :) Any ETA on this or are you waiting for the full release?

[ghost]

@randm-ch Also required is the new crossproject to use this, but looks like that work is done already - portable-scala/sbt-crossproject#99.

So nothing holding back on moving this forward now... but I'm away on holiday for another week.

But the tentative release for sbt 1.2 is only 16th July, not far way in any case

[ghost]

However, in #2267 @djspiewak notes that sbt-crossbuild is required for 2.13.X, so I'm wondering if it may be better/quicker/easier to split the task up to:

In Parallel:

• update catalaysts build to use sbt-crossproject, leave everything else as-is (N.B. this requires sbt-catalysts changes)
• update cats build to use sbt-crossproject, leave everything else as-is

Then:

• update update catalysts build to use sbt 1.2 and new CI sbt-crossproject, At this point we can see how easy/difficult it is to either migrate cats to sbt-catalysts OR manually update cats build to cross compile with scala-js

My main concern/goal would be to "show" to cats, and derivative projects such as cats-effects, that we can increase the build matrix AND make it simpler, as I think there is currently some general concern that all this cross-building is a pain

[ghost]

Status/fyi :

update cats build to use sbt-crossproject, leave everything else as-is

See pr #2323

[randm-ch]

@kailuowang would you mind taking a look at this issue? Sounds like everything's ready, but the original assignee became a ghost 😉

[s5bug]

Any update on this? Scala.JS 1.x has some features I require for a project, and I'd like to be using fs2 for it.

[psttf]

Can this issue be closed now?

[djspiewak]

Most definitely. Thanks for the reminder!