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 decorator is used to register a caching interceptor globally in a NestJS application?
@GlobalCache()
@UseInterceptors(CacheInterceptor)
@Cache()
@GlobalInterceptor(CacheInterceptor)
What is the role of the @SetMetadata decorator in NestJS?
@SetMetadata
It attaches metadata to a class or method.
It validates the data type of a method parameter.
It defines a custom decorator factory.
It applies middleware to a specific route handler.
What is the typical role of a @SetMetadata decorator when working with custom Guards in NestJS?
It directly handles user authentication logic.
It is used to inject dependencies into Guards.
It defines the structure of the response sent back to the client.
It attaches custom metadata to route handlers, which can be accessed within the Guard to make authorization decisions.
What is a common tool or library used for End-to-End (E2E) testing in a NestJS project?
Istanbul
Supertest
Enzyme
Sinon
How do you define a custom HTTP exception filter in NestJS?
By creating a class that implements the ExceptionFilter<T> interface and using the @Catch() decorator with the specific exception type.
ExceptionFilter<T>
@Catch()
By using the @Catch() decorator without any arguments.
By creating a function and annotating it with the @ExceptionHandler() decorator.
@ExceptionHandler()
By creating a class that implements the HttpException interface.
HttpException
Which NestJS module is essential for working with event emitters and listeners?
@nestjs/common
@nestjs/event-emitter
@nestjs/core
@nestjs/platform-express
Which testing type provides the most comprehensive coverage by simulating real user interactions with a running NestJS application?
Regression Testing
End-to-End (E2E) Testing
Integration Testing
Unit Testing
Which of the following is the primary advantage of using TypeORM in a NestJS application?
Direct manipulation of the database using SQL queries
Handling HTTP requests and responses
Simplified database interactions through an Object-Relational Mapper (ORM)
Automatic generation of frontend UI components
How does NestJS facilitate database integration?
NestJS only supports relational databases and not NoSQL databases
NestJS prevents the use of external libraries like TypeORM or Mongoose
NestJS automatically configures database connections without any additional code
NestJS provides a modular structure and decorators to integrate various database solutions