Scala.js support

Hi,

First of all, thanks a lot for all the work you’ve put into this library! I really like it so far 🤩

I decided to feature it in my upcoming book, you can see the corresponding Pull Request.

The Trading application where it’s being used cross-compiles its domain module to JS/JVM, so I was wondering if Scala.js support was planned at some point? For now, I got away by having two different implementations of the Symbol datatype, one for each platform.

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A few other things that would be awesome to add would be Cats’ typeclass instances support. I added the ones I needed in my PR, but I guess it’s so common, this could land in the Cats module (happy to contribute the initial ones!).

import cats.*
import io.github.iltotore.iron.*

object IronCatsInstances:
  inline given [A, B](using inline ev: Eq[A]): Eq[A :| B] = ev.asInstanceOf[Eq[A :| B]]
  inline given [A, B](using inline ev: Order[A]): Order[A :| B] = ev.asInstanceOf[Order[A :| B]]
  inline given [A, B](using inline ev: Show[A]): Show[A :| B] = ev.asInstanceOf[Show[A :| B]]

• Rename modules’ package
• Add Cats’ typeclass instances
• Add ScalaJS and ScalaNative support

[Iltotore]

I should be available this weekend. And even if I’m not, nothing prevents you to submit the PR and I’ll check it as fast as possible.

I would just prefer to have two separated PRs since it’s about two different changes: package renaming and typeclass instances.

[Iltotore]

Update about the package naming discussion: since it doesn’t seem to disturb the asked users, and since similar projects like Refined use this scheme (aka importing eu.timepit.refined._ + eu.timepit.refined.cats) without complaint from their users, removing the “Support” suffix from compatibility packages (i.e catsSupport -> cats) seems to be the best solution (right now).

Actually, to quote Refined again, the project uses the _root_ import in its “cats” module.

import _root_.cats.{Contravariant, MonadError, Semigroup, Show}