Recently upgraded to API 4.6 from 4.4. When running from built JavaScript layer, I am getting the message "[esri.core.workers.JobProxy] Failed to create Worker. Fallback to execute module in main thread" in the console several times when displaying the map. This is followed by:
ErrorEvent {isTrusted: true, message: "Uncaught Error: Uncaught TypeError: Cannot read property 'addEventListener' of undefined", filename: "http://rhel7/pkgs/esri/core/workers/worker.js", lineno: 25, colno: 555, …}
When I set devtools to pause on exceptions, it appears to get the error while evaluating: " self.importScripts(n.loaderUrl)" in the messageHandler function of worker.js. The event.data object has the type field "<configure>" when this happens.
Note that I am only seeing errors in the built version. When running from source files, there are no errors.
Any guidance to resolving this issue would be appreciated.