An OCaml extension for Zed.

This extension includes support for:

• OCaml (.ml) and OCaml Interface (.mli)
• OCaml MLX (.mlx)
• Reason (.re and .rei)
• Dune (dune, dune-project and dune-workspace)
• Menhir (.mly)
• OCamllex (.mll)
• Odoc (.mld)

Language Server

The extension automatically detects how to start ocamllsp based on your project setup, using the following priority order:

1. Dune Package Management — If dune is in PATH and dune pkg enabled succeeds, starts the LSP via dune tools exec ocamllsp.
2. opam — If opam is in PATH, starts via opam exec -- ocamllsp. If a local switch (_opam/) is found in the project root, it is used automatically.
3. Direct — Falls back to running ocamllsp directly from PATH.

Configuration

OCamllsp can be configured via Zed settings.json. For instance, all inlay hints can be enabled using the following:

  "lsp": {
    "ocamllsp": {
      "settings": {
        "inlayHints": {
          "hintFunctionParams": true,
          "hintPatternVariables": true,
          "hintLetBindings": true
        }
      }
    }
  }

The configuration options available are documented here.

Development

To develop this extension, see the Developing Extensions section of the Zed docs.