Language servers

xtralab includes jupyterlab-lsp, which gives completions, diagnostics, and code navigation in editors and notebooks.

Language	Server	Installation
Python	ty	Included with xtralab
TypeScript, JavaScript	typescript-language-server	Registered. Install it yourself.

Python environments

ty resolves imports from a Python environment:

Installation	Environment
Desktop app	The project environment that the kernel uses. Without a project environment, the bundled runtime.
pip or uv	The environment that was active when the server started. Otherwise, a .venv folder at the root of the server folder. See the ty documentation.

Install the TypeScript server

1. Install the server:

   npm install -g typescript-language-server typescript

2. Restart JupyterLab.

Add a language server

1. Install the language server.

2. Run jupyter --paths and find a jupyter_server_config.d/ folder in the config list.

3. Add a JSON file with the server specification to that folder. See the jupyterlab-lsp documentation for the format.

4. Restart JupyterLab.