app-teardown-failed: Micro app teardown failed
Cause
The final cleanup step of disposing of a micro app threw a value that is not an Error, such as a string. This step includes the sandbox's own cleanup and the dispose hooks of custom sandbox plugins.
Failures in the unmount lifecycle and in beforeUnmount or afterUnmount hooks are first wrapped into an Error by single-spa and do not use this code. When cleanup throws an Error instance, qiankun rethrows it unchanged.
Even when this error is reported, disposal has completed and the old instance can no longer be used.
Troubleshooting
- The error message includes the thrown value. Use it to find the code in the
disposehooks of custom sandbox plugins that throws that value. - If a plugin calls another library's cleanup method in
dispose, check whether that method throws strings or plain objects.
Solution
Fix the failing cleanup logic and always throw Error instances so the stack trace and original message are preserved. To run the micro app again, call loadMicroApp to create a new instance.