Bloop

Bloop is a build server and command-line tool designed to compile, test, and run Scala code efficiently from any editor or build tool. It provides incremental and batch compilation capabilities, supports debugging on the JVM, and can build Scala.js and Scala Native applications. The tool integrates with multiple IDEs and text editors, including IntelliJ and Metals for LSP-based editors like Visual Studio Code, Sublime Text, Vim, and Emacs.

Bloop works with several popular build tools including sbt, Maven, Gradle, mill, and Pants, and its design prioritizes build-tool-agnostic functionality. It runs as a background service that manages concurrent build requests from multiple clients while optimizing resource usage and preventing tasks from blocking each other. The tool is developed by scalacenter and is available under the Apache 2.0 license.