You can install the server by first installing nix and then running:
nix-env -iA cachix -f https://cachix.org/api/v1/install # Install cachix for faster installation
cachix use anka-213 # Use my binary cache
nix-env -iA exe -f https://github.com/anka-213/gf-lsp/archive/main.tar.gz # Download and build the GF Language Server
Run npm install in this folder. This installs all necessary npm modules in the client folder
Open VS Code on this folder.
Press Ctrl+Shift+B to compile the client and server.
Switch to the Debug viewlet.
Select Launch Client from the drop down.
Run the launch config.
If you want to debug the server as well use the launch configuration Attach to Server
In the [Extension Development Host] instance of VSCode, open a document in 'gf' language mode.