Migrating from AngularJS to modern Angular is a significant architectural shift that requires moving from a scope-based model to a component-based architecture.
As the creator of CoreUI, I have overseen dozens of enterprise-level migrations where stability was the top priority. The most efficient and modern solution is to use a hybrid application strategy via the @angular/upgrade library, allowing both frameworks to run concurrently during the transition.
By using an incremental approach, you can deliver new features in Angular while gradually refactoring legacy code without a “big bang” rewrite risk.