How can you apply a transformation interceptor to a specific method in a controller in NestJS?
By using the @UseInterceptors() decorator at the method level
@UseInterceptors()
By registering the interceptor globally in the app.module.ts file
app.module.ts
By extending the BaseController class and applying the interceptor in the constructor
BaseController
By using the @Transform() decorator above the controller class
@Transform()
Which module is essential for implementing JWT authentication in a NestJS application?
@nestjs/core
@nestjs/jwt
@nestjs/passport
@nestjs/common
What is the role of the 'transform()' method within a custom Pipe in NestJS?
It contains the logic to transform the input data.
It specifies how the Pipe should handle errors.
It defines the metadata associated with the Pipe.
It determines if the Pipe should be applied globally.
What is the main function of a transformation interceptor in NestJS?
To validate the structure and data types of incoming requests
To log request and response details for debugging purposes
To handle errors and exceptions thrown during request processing
To modify the incoming request or outgoing response data
How do you activate a custom Guard globally in a NestJS application?
By manually adding the guard to each route handler where it's needed.
By defining the guard within the main.ts file of your application.
main.ts
By using the @Global() decorator before the guard class definition.
@Global()
By registering the guard in the providers array of the module where it's defined.
providers
How does the CQRS pattern improve the design of event-driven systems?
By simplifying the handling of complex events
By enforcing synchronous communication between components
By separating read and write operations for better performance and scalability
By eliminating the need for event listeners
What is the role of a Repository in TypeORM?
To manage database migrations
To define database tables
To provide methods for interacting with a specific entity
To handle user authentication
In a NestJS application using CQRS, what is the role of a command handler?
To retrieve data from the database based on a query
To process incoming events and update the application state
To handle errors and exceptions within event listeners
To emit events in response to user actions
Which NestJS module is essential for working with event emitters and listeners?
@nestjs/event-emitter
@nestjs/platform-express
Which testing type provides the most comprehensive coverage by simulating real user interactions with a running NestJS application?
End-to-End (E2E) Testing
Regression Testing
Unit Testing
Integration Testing