Fubby for Visual Studio Code

Language support for Fubby .fab files.

Features

• Syntax highlighting, with bracket matching, comment toggling, and auto-indent.
• Live errors as you type, listed in the Problems panel.
• Deeper errors when a file opens or saves: undefined names, wrong argument counts, type mismatches, and missing imports.
• Format Document using Fubby's own formatter.
• Completions and hover for built-in functions, moon, snow, bela, and your own code.
• Snippets such as main, func, class, for, match, try, test, and route.
• Outline and Go to Definition, including across imports.
• Run button in the editor title bar. Snow apps run with fubby snow serve.

Run these from the Command Palette: Fubby: Run File, Check Syntax, Test File, Test Folder, Serve with Snow, and Install Packages.

Requirements

Errors, formatting, and the run commands need the fubby program, which is a separate download from the Fubby releases page. It is currently available for Intel macOS only.

The plugin looks for fubby on your PATH, then in ~/.local/bin. To use another location, set fubby.executablePath.

Without fubby, highlighting, snippets, completions, and the outline still work.

Limits

• While you type, checking covers syntax and style. Undefined names and type mistakes appear when the file opens or saves, and need a current fubby build.
• There is no step-through debugger. fubby shady debug prints a trace.
• In an untrusted workspace, the plugin doesn't start the fubby program.
• Fubby is a developer preview. Don't run .fab programs you don't trust.

License

Fubby is proprietary software. Copyright © 2026. All rights reserved. No license is granted by this plugin.