scala-js/scala-js

Scala.js, the Scala to JavaScript compiler

Dan Di Spaltro

@dispalt

@ritschwumm yeah we can't use 2015 in production, even though it would be nice, because some of our mobile users see like 10-20s load times that go away with 5.1

Hanns Holger Rutz

@Sciss

using sbt-crossproject, I'm running into a problem in that sbt +publishSigned publishes jvm and js artefacts, but then ultimately fails, I think for the Scala version that is shared between JVM and JS (JVM 2.13), saying Repository for publishing is not specified.. Any idea?

lazy val root = crossProject(JSPlatform, JVMPlatform).in(file("."))
  .settings(commonSettings)  // scalaVersion := "2.13.3"
  .settings(publishSettings) // publishTo := ...
  .settings(
    name                  := "scala-stm",
  )
  .jvmSettings(
    crossScalaVersions := Seq("0.27.0-RC1", "2.13.3", "2.12.12", "2.11.12"),
  )
  .jsSettings(
    crossScalaVersions := scalaVersion.value :: Nil,
  )

where publishSettings clearly defines publishTo repository.

Hanns Holger Rutz

@Sciss

[info]  published scala-stm_0.27 ...
[info]  published scala-stm_2.11 ...
[info]  published scala-stm_sjs1_2.13 ...
[info]  published scala-stm_2.12 ...
[error] java.lang.RuntimeException: Repository for publishing is not specified.

I can manually run a final sbt ++2.13.3 rootJVM/publishSigned, but it's weird that it doesn't work within +publishSigned

Invert Avian

@Invert_Avian_twitter

hi all- I'm trying to get a basic hello world working with the scalajs cli tools. using the test script from https://github.com/scala-js/scala-js-cli/blob/master/scripts/test-cli.sh and subbing in the pre-built binaries from https://www.scala-js.org/doc/internals/downloads.html , the command "./scalajsld -s -o test.js -mm Foo.main bin" is failing with the error "Referring to non-existent method Foo$.main()scala.Unit" ...any ideas what I'm doing wrong here?

Tobias Schlatter

@gzm0

Well... Is there an object Foo with a method def main(): Unit?

Sébastien Doeraene

@sjrd

I suspect you took the binaries of 0.6.33 but you're following the test script of 1.0.0.

2 replies

1.0.0 would ask for main(Array[String]), not main().

kerr

@hepin1989

Do we still need to import import scala.scalajs.js.| using Scala3?

Hanns Holger Rutz

@Sciss

[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]  * org.scala-js:scalajs-library_2.13:1.3.0 is selected over {1.0.1, 1.0.1, 1.0.0, 1.0.1}

This is not a problem, right, because Scala.js chooses other type of semver?

Tobias Schlatter

@gzm0

This is not a problem, indeed.

Anton Sviridov

@keynmol

You can check in the release notes: https://www.scala-js.org/news/2020/10/16/announcing-scalajs-1.3.0/

And I think you're safe:

* It is backward binary compatible with all earlier versions in the 1.x series: libraries compiled with 1.0.x through 1.2.x can be used with 1.3.0 without change.

Sébastien Doeraene

@sjrd

Version conflicts reported by sbt are a nuisance. They're more often false positives than anything else. Don't pay attention to them.

elyphas

@elyphas

Hi, I tried to update up to 1.3.0 but I had troubles so want to downgrade to 1.2.0 but now I can't do it.
because of this error:

[error] org.scalajs.ir.IRVersionNotSupportedException: 
                  Failed to deserialize a file compiled with Scala.js 1.3 (supported up to: 1.2): 
                /home/elyphas/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.13/1.3.0/scalajs-library_2.13-1.3.0.jar:/scala/Tuple12$.sjsir
[error] You may need to upgrade the Scala.js sbt plugin to version 1.3 or later.
[error]         at org.scalajs.sbtplugin.ScalaJSPluginInternal$.enhanceIRVersionNotSupportedException(ScalaJSPluginInternal.scala:83)
[error]         at org.scalajs.sbtplugin.ScalaJSPluginInternal$.$anonfun$scalaJSStageSettings$15(ScalaJSPluginInternal.scala:220)
[error]         at sbt.util.FileFunction$.$anonfun$cached$1(FileFunction.scala:80)
[error]         at sbt.util.FileFunction$.$anonfun$cached$4(FileFunction.scala:153)
[error]         at sbt.util.Difference.apply(Tracked.scala:414

any idea? please.
by the way I had sbt 1.4.0

Sébastien Doeraene

@sjrd

@elyphas You'll need to clean.

elyphas

@elyphas

yes I did it

sbt clean cleanFiles

sudo find . -name target -type d -exec rm -rf {} \;

keeps downloading 1.3.0

@sjrd ; I don't know what else to do. :)

elyphas

@elyphas

also I deleted from .cache/coursier/ and try to compile I get this:

[warn] scalajs-library_2.13-1.3.0.jar no longer exists at /home/elyphas/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.13/1.3.0/scalajs-library_2.13-1.3.0.jar
[warn] scalajs-library_2.13-1.2.0.jar no longer exists at /home/elyphas/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.13/1.2.0/scalajs-library_2.13-1.2.0.jar

Dan Di Spaltro

@dispalt

@sjrd I think this may be the bug in safari that keeps us from going to ES2015, evanw/esbuild#478 tldr; safari does something silly with const/let vs var. More details about the webkit bug here, https://bugs.webkit.org/show_bug.cgi?id=199866

Hanns Holger Rutz

@Sciss

is there an html GUI library that is conceptually close to Swing (or even scala-swing)? e.g. layout managers, event dispatch. ideally with scala.js bindings, or even pure scala.js

Hanns Holger Rutz

@Sciss

perhaps laminar or plain dom .... and steal some css

Anton Sviridov

@keynmol

Laminar is excellent.

Hanns Holger Rutz

@Sciss

I just watched the presentation, it seems very nice, also the presentation calm and clear, the docs seem clear. Now trying the demo

nafg

@nafg

@Sciss in html there aren't layout managers, there are css layouts. Flexbox and Grid are kind of similar to layout managers I suppose in a way

Everything works with events just like in Swing

that's how html works

Hanns Holger Rutz

@Sciss

yeah, it doesn't seem to far off. Something like FlowPanel, GridPanel, BorderPanel should be straight forward to implement.

at least I never used GridBagLayout in my API :sweat_smile:

it's just small user programmable embeddable panels, so the DSL is still fairly small, and it looks like it's not too difficult to have a sjs version, even if the look-and-feel diverges

nafg

@nafg

Everything in CSS is GridBagLayout. You can put sizing properties on anything

FlowPanel is kind of the default situation

Hanns Holger Rutz

@Sciss

nafg

@nafg

If you want something like BorderPanel you might use absolute positioning, or maybe CSS Grid?

But in general you should try to unlearn Swing while doing HTML

Hanns Holger Rutz

@Sciss

first, I will just make the minimum case, Button, Label, ComboBox, FlowPanel, that should be enough to create some basic examples

nafg

@nafg

For instance web pages are scrolling documents, not windows that like to be resized

Hanns Holger Rutz

@Sciss

Well, I'm doing both, so I want the APIs to be fairly close to each other

nafg

@nafg

Maybe use react-native via Slinky

then you can write the code once

Or just embed a web view with JavaFX

https://proton-native.js.org/#/

Hanns Holger Rutz

@Sciss

No, the application is desktop/swing (and will remain that way, I hate web UIs), just some user break-outs should be able to run in a client side browser window. So JavaFX doesn't help. It seems with DOM + some sugar from Laminar that's not too bad

nafg

@nafg

idk what break-outs means but abstracting over an HTML and Swing version of those bits is not necessarily worth it

ritschwumm

@ritschwumm

agreed, that might become quite frustrating. although html and swing are conceptually quite similar, all the details are different.

@Sciss i don't know what you are trying to achieve, but have you seen open stage control https://openstagecontrol.ammd.net/ ?
works quite well to cobble together a bit of a ui running in the browser that talks to the rest of your stuff over OSC.

ritschwumm

@ritschwumm

(actually, i generate the description for the ui in o-s-c from scala code and send it there over OSC)

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