How do I debug the language server

[paulfrench]

After creating a langium project I can debug the extension itself but I cannot workout how to debug the language server? I can see this in the code...

  // The debug options for the server
  // --inspect=6009: runs the server in Node's Inspector mode so VS Code can attach to the server for debugging.
  // By setting `process.env.DEBUG_BREAK` to a truthy value, the language server will wait until a debugger is attached.
  const debugOptions = {
    execArgv: [
      "--nolazy",
      `--inspect${process.env.DEBUG_BREAK ? "-brk" : ""}=${
        process.env.DEBUG_SOCKET || "6009"
      }`,
    ],
  };

Apologies, this is probably more a vscode question but I'm struggling to find an answer. Any pointers would be appreciated! Thanks

[msujew]

Hi @paulfrench,

So basically, the language server is a second process, therefore you need a second debug session/config to actually debug it. We use this attach debug config for this:

https://github.com/langium/langium/blob/221b8cff0f48480c2d07de74bcdf81d6c237d339/.vscode/launch.json#L26-L41

We should probably think about adding it to the yeoman generator project...

[spoenemann]

See #380

[paulfrench]

Many thanks for adding. You could rename "Attach" to "Language Server", makes it a bit more obvious what you are debugging. Cheers