Manually creating entity instances for NestJS tests becomes tedious and brittle. A new library, typeorm-factories, brings the factory pattern to the TypeScript ecosystem, inspired by tools like FactoryBot. It replaces repetitive setup code with a single line, generating realistic data with @faker-js/faker.

Beyond simple creation, the library supports sequences for unique values and states for user roles. This allows tests to be more expressive, like `factory(User).state('admin').make()`. Lifecycle hooks handle password hashing, and associations automatically create related entities, simplifying complex test scenarios.

Version 2.0 introduced advanced features for production codebases. Async factory functions support external API calls, while the `build()` method creates plain objects for isolated unit tests. By centralizing data generation, teams can update entity schemas in one place, making tests more maintainable and focused on business logic rather than setup.