What's the proper way to submit language server settings?

[aivarannamaa]

This is not a bug-report but help request.

I'm in the process of adding LSP support for Thonny IDE. As it is a Python-only IDE, my only server will be basedpyright.

I've been able to get it mostly working, but I'm stuck in setting language server settings. In particular, I want to use different typeshed directory in MicroPython mode.

I tried setting initializationOptions in the params of initialize method like this:

...
   "initializationOptions":{
      "basedpyright":{
         "analysis":{
            "diagnosticMode":"openFilesOnly",
            "typeshedPaths":[
               "/absolute/path/to/my/typeshed"
            ]
         }
      }
   }
...

but it doesn't look like the new typeshed is being taken into account. The same typeshed directory does work when specified via stubPath in pyrightconfig.json.

I also tried sending the same settings via workspace/didChangeConfiguration but this didn't help either.

I tried intecepting the communication between Helix and basedpyright. The initialize message sent from Helix didn't look much different from mine, but unfortunately I couldn't see the rest of the message flow. Probably my interception script had some flows.

What should I check next? Are there some client capabilities, which are required for making initializationOptions work? Or some specific flow of messages?

[DetachHead]

i think those settings can only be sent via workspace/didChangeConfiguration, not initialize