API for Alternate Python Language Servers #24850
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Apr 23, 2025
…4987) For #24850 Summary: Background: A new typechecker called Pyrefly will be featured at Pycon with a [talk](https://us.pycon.org/2025/schedule/presentation/118/), [website/sandbox](https://pyrefly.org/) (still WIP), and [extension](https://marketplace.visualstudio.com/items?itemName=meta.pyrefly) (still WIP). This extension will provide ultrafast typechecking and language services. When the Pyrefly extension is installed, `ms-python.python` should not start Jedi or Pylance unless [`python.pyrefly.disableLanguageServices`](facebook/pyrefly@4d7e23c) is set to `true`. Because of the separation of vscode's `getExtensions` API and config reading logic, I chose to augment `DefaultLSType` with fallback information in case Pyrefly is disabled. This lets `configSettings` pick the correct jedi/pylance without knowing if Pyrefly will be enabled or disabled. Test Plan: still can't get pyright to work in the local extension build but I do see my breakpoints hit and the correct languageServer set https://github.com/user-attachments/assets/395bacbb-7ad0-4357-b084-cd5e88062801
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It was mentioned here that there could soon an API that will support alternate language servers.
I would be super excited about integrating my language server into the python extension and am happy to help as much as I can. The only alternative I can imagine without this API is modifying user settings with the configuration api (setting
python.languageServertoNone) before spinning up our own extension.I'm starting this thread since I don't already see any public discussion about this but please let me know if I'm duplicating anything.
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