Cypress prints (uncaught exception) undefined: undefined when promise rejects with a string

[geritol]

Current behavior

When the app code rejects with a string:

• developer console displays the error properly
• cypress displays (uncaught exception) undefined: undefined and fails the test

Desired behavior

• cypress displays the exact error cause (reject's string content) and fails the test

Test code to reproduce

https://github.com/geritol/cypress-bug-repro

Cypress Version

11.2.0

Node version

v16.18.1

Operating System

macOS 12.6

Debug Logs

No response

Other

No response

[mike-plummer]

Hey @geritol , thanks for opening an issue! I can certainly see how that would be annoying - we do print the rejection with appropriate error message to the browser console, but you're right that we don't always parse out the correct message for the Cypress command log resulting in the "undefined: undefined" behavior. I'll go ahead and forward this enhancement on to the team, but there's no guarantee if/when they'll have bandwidth to dig into it.

In the interim, we always welcome open source contributions if you (or anyone else) if interested in taking a stab at this! I did a little investigation and it should be a fairly trivial issue for a first-time contributor. It appears that the logic in packages/driver/src/cypress/error_utils.ts needs to be updated - the logError function assumes that the uncaught error is an Error object, but in this case it's a string. The logic building the message string needs to be updated to detect whether the err param is a string and if so use that as the message, then add/update tests as needed

[cypress-bot]

The code for this is done in cypress-io/cypress#25059, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 12.2.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v12.2.0, please open a new issue.