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CoffeeScript

v0.0.1 · by Sergii Kozak · added 3 November 2026

Coffeescript language server

LanguagesLanguage servers
Install in Forge SuperView the source

How to install

With Forge Super installed, the button above opens the app on this extension, where you press Install. Nothing is installed until you do.

You can also open the Extensions panel in the app and search for CoffeeScript. The extension's id is coffeescript.

Don't have Forge Super yet? Download it here.

README

From the extension's repository, written by its authors and not by Mentenaz. See the source.

CoffeeScript for Zed

A lightweight Zed extension that adds CoffeeScript support:

  • Syntax highlighting via a Tree‑sitter CoffeeScript grammar
  • LSP features (completion, hover, diagnostics, etc.) via CoffeeSense

Requirements

  • Zed editor
  • Node.js and npm (for running the CoffeeSense language server via npx)
  • Rust toolchain (only needed when you build the extension locally)

Language Server (CoffeeSense)

This extension runs CoffeeSense through npx so contributors don’t need a global install.

Configured in extension.toml:

[language_servers.coffeesense]
name = "CoffeeSense"
languages = ["CoffeeScript"]
command = "npx"
args = ["-y", "coffeesense-language-server@latest", "--stdio"]
Notes:
  • -y accepts prompts; first run may download the package.
  • You can pin a version for stability, e.g. "coffeesense-language-server@1.x".
  • If npx is not on Zed’s PATH, set command = "/usr/bin/env" and args = ["npx", ...].

Grammar

The grammar is defined in extension.toml under [grammars.coffeescript]. It requires a Tree-sitter CoffeeScript grammar repository tree-sitter-coffeescript.

To have syntax highlighting and parsing work you need to clone the grammar locally or point to a public repo. Currently it points to a local checkout path.

Clone the Tree-sitter CoffeeScript grammar and set the local path in extension.toml:

[grammars.coffeescript]
repository = "file:///path/to/your/tree-sitter-coffeescript"
rev = "[latest commit hash]"

After public release this will be updated to use a public repo URL pinned rev, for example:

[grammars.coffeescript]
repository = "<git URL to your tree-sitter-coffeescript>"
rev = "<pinned commit>"

Developing / Installing Locally

  • Open Zed and use the command palette: “Extensions: Install Dev Extension”. Choose coffeescript-zed folder and Zed will build and load the extension from source.
  • Or build manually with Rust (Zed will still handle loading the built artifact when installing the dev extension):
    • cargo build --release

Troubleshooting

  • CoffeeSense doesn’t start: ensure npx is on PATH for Zed. Try setting command = "/usr/bin/env" and args = ["npx", ...] as noted above.
  • First-run is slow: npx may download CoffeeSense on first use; subsequent runs are cached.
  • Grammar not loading on another machine: point [grammars.coffeescript] to a public repo/commit, or vendor the precompiled coffeescript.wasm as described.

More Information

Zed extension development docs: https://zed.dev/docs/extensions/developing-extensions