Web Console does not show Scala sources when using Scala.js 1.x source map

Hi,

It looks like the Scala sources are not shown correctly in the browser’s web console when using Scala.js 1.x source map.

steps

• Set up a simple Scala.js project following https://www.scala-js.org/doc/tutorial/basic/index.html SBT v1.3.7 Scala.js v1.1.0 Scala v2.13.1

• Modify TutorialApp.scala to throw an Exception

package tutorial.webapp

object TutorialApp {
  def main(args: Array[String]): Unit = {
    println("Hello world!")
    throw new Exception("Tada!")
  }
}

• run sbt fastOptJS
• open index-dev.html in Firefox
• open the Web Console (Tools -> Web Developer -> Web Console)

We can see java.lang.Exception: Tada!, but the source points to scala-js-tutorial-fastopt.js:771:5

expectation

I am expecting the source to be TutorialApp.scala:6:4

notes

The source looks correct when using Scala.js v0.6.32:

• Update plugins.sbt to use Scala.js 0.6.32
• sbt clean fastOptJS
• open index-dev.html and we can see TutorialApp.scala:6:4

I tried with Chrome and it behaves differently:

• with Scala.js v0.6.32: no issue
• with Scala.js v1.1.0: the source is TutorialApp.scala:6:4 the first time I open the Web Console, but it shows Throwables.scala:18 after I refresh the page

[gzm0]

I propose to close this as wontfix for now. This will become actionable if we have more solid standards / evidence that Scala.js is doing something wrong. Any objections?

[vmunier]

I propose to close this as wontfix for now. This will become actionable if we have more solid standards / evidence that Scala.js is doing something wrong. Any objections?

That’s fine by me.