UI cannot copy a launch configuration into the workspace launch.json

[eliericha]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.99.0 (Universal)
• OS Version: macOS 14.6.1

Steps to Reproduce:

1. Start VS Code with --disable-extensions --user-data-dir $PWD/tmp-user-data-dir ws/ where tmp-user-data-dir and ws are initially empty
2. Trigger the command Debug: Select and Start Debugging
3. Select Node.js ...
4. Click the gear icon on the right-side of the first listed item
5. A .vscode/launch.json is created and opened in the editor, but the launch configuration is not added
6. The Window output channel shows these errors (I repeated the action 3 times)

2025-04-08 15:31:35.844 [error] [Window] Cannot add property configurations, object is not extensible: TypeError: Cannot add property configurations, object is not extensible
    at frt.writeConfiguration (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2241:264)
    at Wse.value (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2240:15396)
2025-04-08 15:33:09.659 [error] [Window] Cannot assign to read only property 'configurations' of object '#<Object>': TypeError: Cannot assign to read only property 'configurations' of object '#<Object>'
    at frt.writeConfiguration (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2241:264)
    at Wse.value (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2240:15396)
2025-04-08 15:37:27.480 [error] [Window] Cannot assign to read only property 'configurations' of object '#<Object>': TypeError: Cannot assign to read only property 'configurations' of object '#<Object>'
    at frt.writeConfiguration (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2241:264)
    at Wse.value (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2240:15396)

7. Using the same gear button on the second item of the list opens the User settings.json but the launch configuration is not added. The following error appears in the Window output channel:

025-04-08 15:50:39.674 [error] [Window] d.writeConfiguration is not a function: TypeError: d.writeConfiguration is not a function
    at Wse.value (vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2240:15396)

I hope this helps. Thanks!

[eliericha]

Hello! Any news on this? Let me know if you need more information. Thanks!