How to implement DDD bounded contexts in NestJS for complex domains?

Bounded Contexts in DDD isolate subdomains with unique models/language, preventing "big ball of mud" architectures. NestJS modules naturally enforce this via scoped providers/controllers, ensuring User logic never leaks into Order domain. Domain events bridge contexts asynchronously; aggregates guard invariants. CQRS complements by separating writes (commands) from reads (queries) within each context.

Separate modules per context: UserModule, OrderModule.

Structure:

Code

user/
├── domain/user.entity.ts (Aggregate Root)
├── value-objects/email.vo.ts
├── user.service.ts (Domain Service)
└── user.module.ts
      

Code:

Code

// user.entity.ts
export class User {
  constructor(public id: string, private email: Email) {}
  changeEmail(email: Email) { this.email = email; }
}

// user.module.ts
@Module({
  providers: [UserService, PrismaUserRepo],
  controllers: [UserController]
})
export class UserModule {}