Config based, concurrent-first, client-server JVM build tool.

🚧 Work in progress, expect rough edges and breaking changes.

Feedback and contributions are very welcome! ❤️

• CLI client with shell completions
• BSP client with support for VSCode and IntelliJ
• exploring the build with listing modules, tasks, and execution plans (visualized as DOT graphs)
• packaging module as JAR, uber JAR, Scala.js bundle, Scala Native executable
• executing tests
• module REPL
• watch mode with concurrent execution in multiple terminals
• import from sbt
• OTEL tracing support
• basic plugins support with automatic reloading

Deder is used in some of my OSS projects:

• https://github.com/sake92/deder (yes, it bootstraps itself!)
• https://github.com/sake92/sharaf
• https://github.com/sake92/regenesca
• https://github.com/sake92/squery
• https://github.com/sake92/tupson

• project is the root of your git repo
• module is a "subproject", like common/frontend/app..
• task is something you can run on a module, like compile/test/run/assembly..

The examples folder has working projects that show you how to use Deder to build, cross-build, test, publish, and use Scala.js / Scala Native.

Deder needs JDK 21+.

brew tap sake92/tap
brew install deder

scoop bucket add sake92 https://github.com/sake92/scoop-bucket.git
scoop install deder

1. download deder-client.jar (or a native version) from early release
2. rename it to just deder
3. do chmod +x deder
4. put it in PATH

deder exec                          # compile all modules (default task)
deder exec -t compile -m common     # compile a specific module
deder exec -t test                  # run all tests
deder exec -t test -m mymod-test    # run tests for one module
deder exec -t assembly -m app       # build an uber JAR
deder exec -t run -m app --watch    # run with file-watching
deder import                        # import project from sbt
deder bsp install                   # write BSP config for IDE import
deder shutdown                      # stop the background server

For the full command reference see the Cheatsheet.

Run deder bsp install and just open with VSCode or IntelliJ (open as a BSP project). The reset.sh script does this for you in examples...

Supported features:

• import of project
• navigation
• compilation and diagnostics
• run main classes
• run tests

If you work on server code, after you build it you can run ./reset.sh in examples/multi

Deder supports custom tasks via a plugin API. See the Plugins how-to to get started.

See CONTRIBUTING.md for how to build Deder locally, run integration tests, setup tracing etc.