REST-first design is Imperative, DDD is Declarative [Comparison] - DDD w/ TypeScript

A comparison between REST-first CRUD design and Domain-Driven Design (DDD) in Node.js/TypeScript applications. REST-first design tends to be imperative — business logic ends up scattered in controllers or services, leading to poor encapsulation, discoverability, and flexibility. DDD takes a declarative approach by encapsulating business rules inside domain entities, making the code more expressive and easier to extend. A movie rental example illustrates how a bloated controller with inline business rules can be refactored into a clean, declarative domain model where `customer.rentMovie(movie)` handles all constraints internally.