(uncaught exception) ReferenceError: SharedArrayBuffer is not defined in Electron Browser after Update to 8.6.0

Current behavior

After the Update from 8.5.0 to 8.6.0 I get the following error while starting my app in the Electron browser:

Uncaught (in promise) ReferenceError: SharedArrayBuffer is not defined

The problem might be the new Electron version, but until now I was not able to find the root cause. An other Cypress user reported a similar problem on Stackoverflow: https://stackoverflow.com/questions/70794396/sharedarraybuffer-not-defined-when-using-cypress/70863376#70863376

Desired behavior

The app should start normally without the SharedArrayBuffer error.

Test code to reproduce

Here ist a simple Code Repo to reproduce the error: https://github.com/unlocomqx/cypress-ffmpeg

Switch the Cypress version to 8.5.0 and start the test with the Electron browser. -> It should work fine Switch the Cypress version to 8.6.0 or higher and start the test with the Electron browser. -> The SharedArrayBuffer error occurs.

Cypress Version

8.6.0 and higher

Other

No response

[Im-a-Train]

@unlocomqx I tested it locally by setting the headers in serve-base.ts as mentioned above in the following file: “C:\Users{USERNAME}\AppData\Local\Cypress\Cache\8.6.0\Cypress\resources\app\packages\server\lib\server-base.js” And the result was as expected. If the top level request returns the COEP and the COOP headers, it works:

@tbiethman, @jennifer-shehane or who else is able to fix this. Could you please fix this. Thanks.

[6sixtyfour4]

Dear Cypress team We encounter the same situation in our projects. It’s getting more and more painful to be stuck with an old Cypress version (8.5.0). We kindly ask you to give this issue a higher priority since the solution is already mentioned in the comments above. Thank you!