The "Big Bang" rewrite is the single greatest risk to enterprise software stability. Rewriting a massive AngularJS (v1.x) monolith from scratch pauses feature development for months (or years), destroys institutional knowledge buried in legacy logic, and almost invariably results in a product that has fewer features and more bugs than the original. The alternative is the Shell Strategy (an implementation of the Strangler Fig pattern). Instead of replacing the application, you wrap the legacy AngularJS application inside a modern Angular "Shell." Both frameworks run simultaneously in the same browser tab, sharing state and adhering to a unified routing strategy. This allows you to migrate one route or component at a time while shipping new features in modern Angular immediately. The Architectural Conflict: Digest Cycles vs. Zones The fundamental difficulty in running AngularJS and Angular side-by-side lies in their change detection mechanisms and routing arbitrat...
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