Autocompletion doesn't work in VSCode jupyter notebooks + deno kernel

[btwiuse]

To reproduce:

• Create a new Jupyter Notebook in VS Code.
• Set the kernel to Deno.
• Enter a cell: let x = 42
• Execute the cell
• Enter another cell: x.

Autocompletion doesn't show up when I press tabs. It currently works only in jupyterlab.

Is there any way to get it working in VSCode?

[btwiuse]

Update: I discovered by accident that if you change the language from "typescript" to "python", autocompletion works immediately when . is pressed

[bartlomieju]

Thanks for reporting, that's quite strange! I'll take a look at the extension and see if that's the problem with how it treats TS cells or problem on the Deno side.

[bartlomieju]

CC @rgbkrk

[DonJayamanne]

Hi, I’m one of the engineers working on vscode and support for Jupyter notebooks in vscode
I’ll take a look and see what’s going on at our end

[DonJayamanne]

@rgbkrk @bartlomieju
Perhaps you can help me, I didn't want to create a new issue and sorry for highjacking this issue.
I've installed the latest versin of deno 1.37
regular stuff works, but not wirdgets.
I'm assuming thats because widgets are still a WIP
Or do I need to do something different

This is the error message I'm getting

Stack trace:
Error: Deno.jupyter is only available in `deno jupyter` subcommand.
    at Object.get (ext:cli/runtime/js/99_main.js:550:15)
    at hasJupyterBroadcast (https://deno.land/x/display@v1.1.1/mod.ts:69:5)
    at display (https://deno.land/x/display@v1.1.1/mod.ts:189:8)
    at <anonymous>:3:7

[rgbkrk]

The last patch release was missing this hardening of the jupyter namespace: #20710

If you want to try out widgets (really only anywidget), you'll need to build from source or install the canary:

deno upgrade --canary

You can also target a specific commit like:

deno upgrade --canary --version=6cb5d8eb86fe205ad4f4411e20c206246ff25682

One other note on widget support -- there is only sending, no receiving.

[karelklima]

Autocompletion does not work for me on Windows if Deno and Python are installed via scoop. I uninstalled everything and installed Deno using the recommended PowerShell command and Python using Windows installer, which fixed the problem.