If you have been using aliases in Webpack, and want to switch over to Babel instead, you can use the Babel Module Resolver Plugin. Then just configure your aliases, such as:
Great, now it builds and we can remove the aliases from Webpack, or if you can’t get them to resolve properly in JEST / Jasmine any more.
Oh wait, now it’s throwing false positives on import paths not being correct. The deceptive error lead me to needing another package, not defined as a dependency: ESLint Import Resolver for Babel
A close and re-open of my IDE, and the lint errors there were solved. A stop / start of gulp, and the false positives there went away, too.