Possible Unhandled Promise Rejection (id: 0): Error: "getLoginData" is read-only

It looks like a dependency of babel is the cause of the issue in my case.

When I look in my package-lock.json, and search for plugin-transform-regenerator I see version 7.4.5. Locking the version to 7.4.4 by adding it to my package.json allows me to build without issue.

This problem would have been easier to track down if I was not ignoring my package-lock.json.

In summary,

npm i -E @babel/[email protected]