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Metals v0.4.4 - Tin

· 2 min read

Metals is a language server for Scala that works with VS Code, Atom, Vim, Sublime Text and Emacs. Metals is developed at the Scala Center along with contributors from the community.

Metals server

In this milestone we merged 5 PRs, full details:

Improved code navigation

Several "goto definition" and "find references" bugs have been fixed in this release. In particular, code navigation should work more reliably now for the following language features

  • for comprehensions with multiple assignments and guards
  • eta-expanded methods and functions passed as values
  • val patterns like val (a, b) = ...
  • named arguments in apply methods
  • repeated parameter types (varargs)

Empty source directories are no longer created

Previously, Metals created all source directories like src/main/java and src/main/scala-2.12 even if they were unused. Now, Metals still creates these directories but removes them again after the file watcher has started. Big thanks to first-time contributor @mudsam for implementing this fix!

Multiple workspace folders

Metals now looks for .scalafmt.conf in all workspace folders instead of only the workspace root.

Avoid metals.sbt compile errors on old sbt versions

The generated metals.sbt file in ~/.sbt/0.13/plugins/metals.sbt now compiles on all versions of sbt 0.13.x even if Metals itself still only works with sbt 0.13.17+.

Visual Studio Code

The Metals extension was installed over 1000 times over the past week!


The Metals extension now respects the JAVA_OPTS environment variable the same it does the .jvmopts file. For example, set JAVA_OPTS to -Dhttps.proxyHost=… -Dhttps.proxyPort=… to configure HTTP proxies. It's recommended to start VS Code with the code binary from the terminal to ensure environment variables propagate correctly.

Sublime Text

There's a WIP pull request tom654/LSP#501 adding support for fuzzy symbol search (workspace/symbol). Please upvote with 👍 if you'd like to use this feature!


There is a new Gitter channel rossabaker/lsp-scala for Emacs and Metals users.

The lsp-scala package is now published to MELPA melpa/melpa#5868.

Merged PRs

  • Upgrade to Bloop v1.2.5 #513 (olafurpg)
  • Respect workspace folders for Scalafmt formatting, fixes #509. #512 (olafurpg)
  • Fix navigation bug for var setters. #511 (olafurpg)
  • Upgrade to Scalameta v4.1.3. #510 (olafurpg)
  • Change behavior of FileWatcher so that it doesn't create non-existing source directories #506 (mudsam)
  • Reference pluginCrossBuild via reflection to support older sbt 0.13. #505 (olafurpg)