"process is not defined" erorr makes app non-responsive

[jcapogna]

I'm in the process of upgrading a CoreUI v3 project to v4. I've got things working except for some minor layout tweaks.

The problem I'm having is that the app is unresponsive when I leave the browser tab and come back to it. For example, clicking on a link results in no behavior. In the console, I see the following error. This error seems to occur either when I leave the tab or return to it. It's reproducible 100% of the time, no matter which page of my app I'm on.

Uncaught ReferenceError: process is not defined
    at 4043 (<anonymous>:2:13168)
    at r (<anonymous>:2:306599)
    at 8048 (<anonymous>:2:9496)
    at r (<anonymous>:2:306599)
    at 8641 (<anonymous>:2:1379)
    at r (<anonymous>:2:306599)
    at <anonymous>:2:315627
    at <anonymous>:2:324225
    at <anonymous>:2:324229
    at e.onload (index.js:1:1)

Has anyone else run into this? I'm not certain it is CoreUI related, but it only started happening when I upgrade to v4.

[jcapogna]

I've discovered the app is non-responsive because there is an invisible iframe covering the page. I think this might be related to this: facebook/create-react-app#11773

[jcapogna]

Yup. The solution here fixed it for me: facebook/create-react-app#11773 (comment)

This was caused by some incompatibilities in React libraries and not Core UI itself. I'll close this ticket.