Integration test failure: Clear outputs after opening Notebook:

[alexr00]

Build: https://dev.azure.com/monacotools/a6d41577-0fa3-498e-af22-257312ff0545/_build/results?buildId=317204
Changes: ff39acb...bb4a59d

1) ipynb Clear Outputs
       Clear outputs after opening Notebook:
     Notebook Editor creation failure for document {"$mid":1,"fsPath":"Untitled-1.ipynb","_sep":1,"external":"untitled:Untitled-1.ipynb?jupyter-notebook","path":"Untitled-1.ipynb","scheme":"untitled","query":"jupyter-notebook"}

[amunger]

@mjbvz added a way for the notebook editor to bail on webview fatal error #176680

Error is thrown here: https://insiders.vscode.dev/github/microsoft/vscode/blob/main/src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts#L593

The error from the logs in this case:

Error: Could not initialize webview: Error: Could not register service workers: 
TypeError: ServiceWorker script at https://15jrq3f462komn57ip84flcqtsrqc2mq0igbke023flk22h7c8ko.vscode-cdn.net/insider/ef65ac1ba57f57f2a3961bfe94aa20481caca4c6/out/vs/workbench/contrib/webview/browser/pre/service-worker.js?v=4&vscode-resource-base-authority=vscode-resource.vscode-cdn.net&remoteAuthority=localhost:8000 
for scope https://15jrq3f462komn57ip84flcqtsrqc2mq0igbke023flk22h7c8ko.vscode-cdn.net/insider/ef65ac1ba57f57f2a3961bfe94aa20481caca4c6/out/vs/workbench/contrib/webview/browser/pre/
encountered an error during installation..}

@mjbvz - Do you understand what went wrong here? Is there anything we can do to recover?

[amunger]

from @deepak1556's comment here it sounds like there may just be a top level error in the webview script, though it's not quite the same error as was referenced there:

Error loading webview: Error: Could not register service workers: TypeError: Failed to register a ServiceWorker for scope ...

in that issue, vs here we had

Error: Could not initialize webview: Error: Could not register service workers: TypeError: ServiceWorker script at {...} for scope ...

[mjbvz]

If the service worker can't load, I don't think notebooks will work properly

@amunger This only happens on Firefox, right? Is it consistent or just happen occasionally? The service file that it is trying to load should have existed for a while. However I have seen folks report that webview don't work on Firefox with certain security features enabled

[amunger]

This was a Windows integration test and fails just enough to cause many of our integration tests to be marked 'skip'. So, getting to the bottom of this could help increase test coverage for notebooks quite a bit.