Build and Package Management

Flix comes with a build system and package manager. The build system makes it simple to compile a Flix program to a collection of Java classes and to build a fat JAR. The package manager makes it possible to create Flix packages, publish them on GitHub, and depend on them via a manifest file. The package manager also makes it possible to depend on Java JAR-artifacts published on Maven.

The Flix build system supports the following commands:

  • init: creates a new Flix project in the current directory.
  • check: checks the current project for compiler errors.
  • build: builds the current project (i.e. emits Java bytecode).
  • build-jar: builds a jar-file from the current project.
  • build-pkg: builds a fpkg-file from the current project.
  • run: runs main in current project.
  • test: runs all tests in the current project.

All commands can be executed from the command line, from the REPL, and from VSCode.

All commands, except build-pkg work without a manifest file. To build, package, and publish a Flix project, a flix.toml manifest is required. The init command will create an empty skeleton flix.toml manifest, if not already present.

Project Structure

Flix scans for source files in the paths *.flix, src/**.flix,, and test/**.flix.

Flix scans for Flix packages and JARs in the paths lib/**.fpkg and lib/**.jhar.