Agentic Composer breaking for Jest tests

[nickz22]

Thanks for reporting a bug you have found in Cursor!
Please add the following info to help us diagnose your issue:

Check the forum to ensure the issue hasn’t been reported already
Checked

Provide a clear description of the bug
When I ask composer to create a jest test for me while also providing other jest tests as context I see the “forever loader” issue, where the product is stuck in a never ending thinking loop. The exact same prompt works in the “Chat” window.

Explain how to reproduce the bug (if known)

Attach screenshots or recordings (e.g., .jpg, .png, .mp4).

Tell us your operating system and your Cursor version (e.g., Windows, 0.x.x).
Version: 0.44.11

VSCode Version: 1.93.1

Commit: fe574d0820377383143b2ea26aa6ae28b3425220

Date: 2025-01-03T07:59:06.361Z (2 wks ago)

Electron: 30.5.1

Chromium: 124.0.6367.243

Node.js: 20.16.0

V8: 12.4.254.20-electron.0

OS: Darwin arm64 23.6.0
Tell us if the issue stops you from using Cursor.
It does completely break my ability to use Cursor for Jest code.

LOGS
2workbench.desktop.main.js:3542 [Extension Host] jest-editor-support parser returned error TypeError: Cannot read properties of undefined (reading ‘flatMap’)
at t.JestRunnerCodeLensProvider. (/Users/nzozaya@sitetracker.com/.cursor/extensions/firsttris.vscode-jest-runner-0.4.74/src/JestRunnerCodeLensProvider.ts:69:15)
at Generator.next ()
at /Users/nzozaya@sitetracker.com/.cursor/extensions/firsttris.vscode-jest-runner-0.4.74/dist/extension.js:1:61375
at new Promise ()
at fileName (/Users/nzozaya@sitetracker.com/.cursor/extensions/firsttris.vscode-jest-runner-0.4.74/dist/extension.js:1:61120)
at t.JestRunnerCodeLensProvider.provideCodeLenses (/Users/nzozaya@sitetracker.com/.cursor/extensions/firsttris.vscode-jest-runner-0.4.74/src/JestRunnerCodeLensProvider.ts:63:43)
at m.provideCodeLenses (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:192:104478)
at /Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:192:137928
at Ze.s (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:192:136674)
at Ze.$provideCodeLenses (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:192:137916)
at R.S (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:189:5984)
at R.Q (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:189:5750)
at R.M (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:189:4732)
at R.L (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:189:3603)
at a.value (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:189:2298)
at o.B (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:113:734)
at o.fire (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:113:951)
at u.fire (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:135:14600)
at a.value (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:215:8666)
at o.B (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:113:734)
at o.fire (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:113:951)
at u.fire (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:135:14600)
at MessagePortMain. (/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:215:6792)
at MessagePortMain.emit (node:events:519:28)
at Object.MessagePortMain._internalPort.emit (node:electron/js2c/utility_init:2:2619)
at Object.callbackTrampoline (node:internal/async_hooks:130:17)
console.error @ workbench.desktop.main.js:3542
d @ workbench.desktop.main.js:530
$logExtensionHostMessage @ workbench.desktop.main.js:2950
S @ workbench.desktop.main.js:2950
Q @ workbench.desktop.main.js:2950
M @ workbench.desktop.main.js:2950
L @ workbench.desktop.main.js:2950
(anonymous) @ workbench.desktop.main.js:2950
B @ workbench.desktop.main.js:470
fire @ workbench.desktop.main.js:470
fire @ workbench.desktop.main.js:1153
G.onmessage @ workbench.desktop.main.js:3000
workbench.desktop.main.js:530

[danperks]

Hey, from the logs, it looks like the vscode-jest-runner extension may not have full compatibility with Cursor yet!

However, that shouldn’t stop the composer from executing properly.
Can you try to start a new composer, and try the same prompt again to see if that works?

[nickz22]

Yes, trying now.

[danperks]

Alternatively, try to disable that extension, restart Cursor, and see if that helps, as there is a small change the extension is actually breaking Cursor enough to stop it from submitting prompts correctly.

[nickz22]

Same result in new Composer chat - loom recording https://www.loom.com/share/d144120fbc7a4a35b3fbe78c1fd92bea?sid=72de82a9-74c2-4a7d-a76b-f9f907e2c0f8

Trying to disable the extension now.

[nickz22]

Separate but now related issue is that I can’t see my extensions in Cursor.

They are showing in VSCode:

l

Strange. I’ll try to dig into why that’s occurring but it’s been that way for a while now.

[nickz22]

Trying the CLI

[nickz22]

Uninstalled via cli, trying the prompt again.

[nickz22]

That looks like it worked!

[danperks]

Glad you’ve seemed to resolve it!