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The Flix Programming Language

Flix for Visual Studio Code

The official Visual Studio Code extension for the Flix Programming Language (flix.dev).

Flix is a next-generation reliable, safe, concise, and functional-first programming language.

Flix aims to have world-class Visual Studio Code support and our extension is based on the real Flix compiler infrastructure.

Features

  • Semantic Syntax Highlighting

  • Diagnostics

    • Compiler error messages.

  • Auto-complete

    • Auto-complete as you type.
    • Auto-completion is context aware.
    • Type-directed completion of program holes.

  • Snippets

    • Auto-complete common code constructs.

  • Inlay Hints

    • Shows inline type information.

  • Type and Effect Hovers

    • Hover over any expression to see its type and effect.
    • Hover over any local variable or formal parameter to see its type.
    • Hover over any function to see its type signature and documentation.

  • Jump to Definition

    • Jump to the definition of any function.
    • Jump to the definition of any local variable or formal parameter.
    • Jump to the definition of any enum case.

  • Find References

    • Find all references to a function.
    • Find all references to a local variable or formal parameter.
    • Find all references to an enum case.
    • Find all implementations of a trait.

  • Symbols

    • List all document symbols.
    • List all workspace symbols.

  • Rename

    • Rename local variables or formal parameters.
    • Rename functions.

  • Code Lenses

    • Run main from within the editor.
    • Run tests from within the editor.

  • Highlight

    • Highlights semantically related symbols.

  • Semantic Tokens

    • Additional code highlighting hints provided by the compiler.

Installation

  • Install the Flix Visual Studio Code extension.
    • The extension will automatically download the Flix compiler.

Alternative (for advanced users):

  • Upon startup, the extension with look for a flix.jar compiler in the project root and use that if available.
    • This can be used to run a nightly (or custom-built) version of the compiler.

Requirements

  • Requires Java 21 (or later).
    • Ensure that the java command is on your path.

For Developers

Information about running, debugging, and packaging the extension is available in DEV.md.