Dottydoc fails to read symbol in scalajs project on RC2

[djspiewak]

[error] -- Error: kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala:38:8 -
[error] 38 |        p.`then`[Unit](onFulfilled, defined(onRejected))
[error]    |        ^^^^^^^^^^^^^
[error]    |undefined: p.then # -1: TermRef(TermRef(NoPrefix,val p),then) at readTasty

Not very minimized, sorry. Here is the exact line and commit hash: https://github.com/typelevel/cats-effect/blob/dedfedecf843e4272488eeaa71581d64eeb08194/kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala#L38 This compiles and runs just fine on 2.12, 2.13, RC1, and RC2. However, when I attempt to run sbt doc, it errors here.

[griggt]

Without cats-effect:

import scala.scalajs.js.{|, defined, Function1, Promise, Thenable}

trait Foo {
  def bar[A](p: Promise[A]) = {
    val onFulfilled: Function1[A, Unit | Thenable[Unit]] = ???
    val onRejected: Function1[Any, Unit | Thenable[Unit]] = ???
    p.`then`[Unit](onFulfilled, defined(onRejected))
  }
}

Seems to have been working before #11671

[VlachJosef]

Same problem is happening in playframework/play-json#590

[error] -- Error: play-json/js/src/main/scala/StaticBinding.scala:118:25 --------------------------------------------------------------------------------------------
[error] 118 |    if (!escapeNonASCII) JSON.stringify(s) else escapeStr(JSON.stringify(s))
[error]     |                         ^^^^^^^^^^^^^^^^
[error]     |undefined: scala.scalajs.js.JSON.stringify # -1: TermRef(TermRef(TermRef(ThisType(TypeRef(NoPrefix,module class scalajs)),object js),JSON),stringify) at readTasty
...
[error] (play-jsonJS / Compile / doc) DottyDoc Compilation Failed

Workaround there was to provide missing argument for JSON.stringify(s, null)

[yurique]

I'm getting a very similar error in this file: https://github.com/tulz-app/frontroute/blob/5cd37701c6203cf1a6679960cf17f2f63f114bf3/src/main/scala/io/frontroute/RouteLocation.scala
(https://github.com/tulz-app/frontroute/runs/2260870881?check_suite_focus=true)

[error] -- Error: src/main/scala/io/frontroute/RouteLocation.scala:35:4 ----------------
[error] 35 |    RouteLocation(
[error]    |    ^
[error]    |undefined: io.frontroute.RouteLocation.apply # -1: TermRef(TermRef(TermRef(ThisType(TypeRef(NoPrefix,module class io)),object frontroute),object RouteLocation),apply) at readTasty
[error] 36 |      hostname = location.hostname,
[error] 37 |      port = location.port,
[error] 38 |      protocol = location.protocol,
[error] 39 |      host = location.host,
[error] 40 |      origin = location.origin.toOption,
[error] 41 |      unmatchedPath = extractPath(location),
[error] 42 |      params = LocationUtils.parseLocationParams(location),
[error] 43 |      state = state

A workaround for me was to change line 35 to be new RouteLocation( instead of RouteLocation(.

[griggt]

Standalone simpler version of the above:

import scala.scalajs.js

final case class RouteLocation(loc: String, state: js.UndefOr[js.Any])

object RouteLocation:
  def apply(loc: String): RouteLocation = RouteLocation(loc, js.undefined)

[pikinier20]

I've tried to compile @djspiewak problematic project from tasty with command:

./scalac -classpath /home/fzybala/scala3bench/cats-effect-series-3.x/kernel/js/target/scala-3.0.0-RC3/classes:/home/fzybala/.cache/coursier/v1/https/repo1.maven.org/maven2/org/typelevel/cats-core_sjs1_3.0.0-RC3/2.6.0/cats-core_sjs1_3.0.0-RC3-2.6.0.jar -from-tasty /home/fzybala/scala3bench/cats-effect-series-3.x/kernel/js/target/scala-3.0.0-RC3/classes/cats/effect/kernel/AsyncPlatform.tasty 

And got following error log:

-- Error: kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala:38:8 -
undefined: p.then # -1: TermRef(TermRef(NoPrefix,val p),then) at readTasty
-- Error: kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala:38:36 
undefined: scala.scalajs.js.defined.apply # -1: TermRef(TermRef(TermRef(ThisType(TypeRef(NoPrefix,module class scalajs)),object js),defined),apply) at readTasty
-- Error: kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala:32:22 
undefined: scala.scalajs.js.JavaScriptException.apply # -1: TermRef(TermRef(TermRef(ThisType(TypeRef(NoPrefix,module class scalajs)),object js),JavaScriptException),apply) at readTasty
3 errors found

So for me it looks like it's not directly related to doctool but TASTY file is invalid and causes errors when you try to compile from tasty.

[smarter]

undefined: scala.scalajs.js.defined.apply

Looks like you're compiling without the scala.js standard library on the classpath.

[pikinier20]

You're right, I've added js library on classpath, but still I get errors

./scalac -classpath /home/fzybala/scala3bench/cats-effect-series-3.x/kernel/js/target/scala-3.0.0-RC3/classes:/home/fzybala/.cache/coursier/v1/https/repo1.maven.org/maven2/org/typelevel/cats-core_sjs1_3.0.0-RC3/2.6.0/cats-core_sjs1_3.0.0-RC3-2.6.0.jar::/home/fzybala/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.13/1.5.1/scalajs-library_2.13-1.5.1.jar:/home/fzybala/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_sjs1_3.0.0-RC3/3.0.0-RC3/scala3-library_sjs1_3.0.0-RC3-3.0.0-RC3.jar -from-tasty /home/fzybala/scala3bench/cats-effect-series-3.x/kernel/js/target/scala-3.0.0-RC3/classes/cats/effect/kernel/AsyncPlatform.tasty 
-- Error: kernel/js/src/main/scala/cats/effect/kernel/AsyncPlatform.scala:38:8 -
undefined: p.then # -1: TermRef(TermRef(NoPrefix,val p),then) at readTasty
1 error found

[smarter]

No idea what's going on but you probably also need -scalajs.

[pikinier20]

Actually I've tried to use -scalajs flag but with this flag included I've got an exception with very long stacktrace: https://pastebin.com/CgFw5tu8
I also noticed that cats-effect use lib: scalajs-library_2.13-1.5.1.jar which looks like it's compiled with 2.13 and apparently this one is causing exception. Removing this lib from classpath while still using -scalajs flag takes us back to my first error log (3 errors)

[smarter]

scalajs-library_2.13-1.5.1.jar which looks like it's compiled with 2.13

Yes, that's normal, there's no Scala 3 version of scalajs-library and Scala 3 Scala.js projects always depend on the 2.13 version.