Hi Ryann, I have a few questions that will help us get to the bottom of this:
* What is the last production version of the ArcGIS API for JavaScript that does work in your app?
* Does the error occur during the app build or does it occur during a specific UI action?
* If the app breaks from some user interface action, can you provide the block of code that is breaking, or do you have a stackblitz version of this?
* Can you duplicate this outside of Angular in a stand-alone JS app?
* Can you also share your package.json file?
FYI, it may be easier to open an issue here and continue the conversation => Issues · Esri/angular-cli-esri-map · GitHub . It also makes it a lot easier for other Angular devs to track and find answers to similar questions.