Production & Tooling — Chapter Quiz

Question 1

1

What does @nestjs/config primarily provide?

AA CSS frameworkBA typed wrapper around environment variables with validationCA logger transportDA database driver

@nestjs/config loads .env, exposes ConfigService, and validates required vars with Joi or class-validator.

Question 2

2

Which interceptor caches GET responses automatically?

ACacheInterceptorBTimeoutInterceptorCTransformInterceptorDLoggingInterceptor

CacheInterceptor from @nestjs/cache-manager keys responses by URL and returns the cached payload on subsequent calls.

Question 3

3

What underlying technology powers BullMQ queues?

APostgreSQLBKafkaCRedisDRabbitMQ

BullMQ stores jobs and coordinates workers via Redis.

Question 4

4

Which decorator schedules a method to run on a cron expression?

A@CronB@IntervalC@TimeoutD@Schedule

@Cron('0 0 * * *') runs the method daily at midnight. @Interval runs at a fixed ms cadence; @Timeout runs once after a delay.

Question 5

5

In a multi-stage Dockerfile, why is the build stage separate from the runtime stage?

AIt makes builds slower but more reliableBThe runtime image excludes dev dependencies and build tools, staying smallCDocker requires multiple stagesDIt is the only way to run TypeScript

The build stage compiles with dev deps; the runtime stage copies only the compiled output plus prod deps — smaller image, smaller attack surface.

Question 6

6

Test.createTestingModule lets you override providers with mocks.

TTrueFFalse

You can pass mocked providers in the providers array or chain .overrideProvider(X).useValue(stub) on the builder.

Question 7

7

For high-performance structured logging in Nest, swap the default logger for nestjs-___.

nestjs-pino wraps the Pino logger — fast, JSON-friendly, and request-scoped via pino-http.

Question 8

8

Which steps are worth doing before deploying a Nest app to production?

Select all that apply.

AValidate environment variables at bootBAdd a /health endpoint with @nestjs/terminusCRun database migrations inside main.ts on every bootDUse a multi-stage Dockerfile and a non-root user

Validating env, exposing health checks, and shipping a small, non-root container are best practices. Running migrations in main.ts races across replicas — run them as a separate CI step.

Test what you learned.