Announcing Scala.js 0.6.21

Nov 6, 2017.

We are pleased to announce the release of Scala.js 0.6.21!

This release is almost exclusively a bug-fix release.

Read on for more details.

Getting started

If you are new to Scala.js, head over to the tutorial.

Release notes

If upgrading from Scala.js 0.6.14 or earlier, make sure to read the release notes of 0.6.15, which contain important migration information.

As a minor release, 0.6.21 is backward source and binary compatible with previous releases in the 0.6.x series. Libraries compiled with earlier versions can be used with 0.6.21 without change. 0.6.21 is also forward binary compatible with 0.6.{17-20}, but not with earlier releases: libraries compiled with 0.6.21 cannot be used by projects using 0.6.{0-16}.

Please report any issues on GitHub.

New features


The following JDK API methods have been added:

  • java.lang.StringBuilder.delete
  • java.lang.StringBuffer.delete

Bug fixes

The following bugs have been fixed in 0.6.21:

  • #3125 println("\u0007") renders as the character "a"
  • #3128 Scala.js 0.6.20 breaks Java 7 builds (NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet)
  • #3134 regex.Matcher.start(group) and friends report wrong positions
  • #3135 Relative path to source file in sourcemap is sometimes broken

You can find the full list on GitHub.