xuwei-k / scalafmt   3.7.14-fork-1

Apache License 2.0 Website GitHub

Code formatter for Scala

Scala versions: 2.13 2.12
Scala.js versions: 1.x


Build Status Build status Join the chat at https://gitter.im/scalameta/scalafmt Join the discord chat Latest version

Head over to the user docs for instructions on how to install scalafmt.

Quick help

  • sbt compile or sbt core/compile (specific project).
  • Run all unit tests: sbt test
  • Run only formatting tests: tests/testOnly *FormatTests.
  • Write new formatting test: read this doc.
  • Build docs: See instructions on the site or locally at ./docs/contributing-website.md.
  • Hack on sbt plugin: run sbt scripted.
  • Run jmh benchmarks: ./bin/run-benchmarks.sh.
  • Run formatter on millions of lines of code: tests/test:runMain org.scalafmt.ScalafmtProps (slow, and requires a lot of memory/cpu)
  • Debug performance: after each test run in FormatTests, a flamegraph report like this one is generated in target/index.html. I usually keep a browser tab open at localhost:3000/target/index.html along with this background process: browser-sync start --server --files "target/*.html". See Browsersync.


The current maintainers (people who can merge pull requests) are:

An up-to-date list of contributors is available here: https://github.com/scalameta/scalafmt/graphs/contributors

We strive to offer a welcoming environment to learn, teach and contribute.


JProfiler generously supports scalafmt with its full-featured Java Profiler.