Making a JVM scala library available in Scala.js

Question

What is the standard/easiest way to make a normal scala library (sbt) available for scala.js (also sbt)? Do I just copy/fork the source files into a scala.js project and build that or is there any smart way to 'wrap' a JVM Scala library and make it usable in a scala.js application?

I am asking because there is an open-source library for JVM scala that I want to use in a scala.js application. I have already copied the .scala files and modified them a bit and everything works fine for now, but this approach seems a bit too 'straight-forward'/clumsy.

Justin du Coeur · Accepted Answer · 2018-10-20 14:58:19Z

4

You want to turn it into a cross-building library. See this page for details, but the summary is that you typically create a "shared" code directory for code that is identical on both sides, with JVM and JS directories for bits that are specific to one platform or the other. Or you can create a "pure" cross-project, which simply compiles both ways.

Note that this assumes that you have control of the library, though. I don't know of any way to "wrap" somebody else's library without their assistance -- in that case, I would probably fork the library and turn the fork into a cross-building one.

answered Oct 20, 2018 at 14:58

Justin du Coeur

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2 Comments

Florian Baierl Over a year ago

Are there any examples of such "pure" cross-projects which compile both ways? I am currently creating a (very) small library that has only one dependency (scalatest). Would something like this be usable for Scala.js out-of-the-box?

Justin du Coeur Over a year ago

I don't have any pure examples myself; I'd probably recommend asking on the scala-js/scala-js Gitter channel. In principle, though, yeah -- once the project is published, it should be straightforwardly usable...

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