NestJS load class dynamically

Question

I have a couple of parser services which I want to load based on condition.

The condition is a version so if the version is 1, Service1 will be loaded if version is 2, Service2 will be loaded, it continues in this pattern.

const version = 1;

// load service class based on version Service1 in this case

I could use switch case statement to load the exact service class based on the version but there could be a lot of service classes and it would not be neat.

Is there any way I could do this in nestJs?

Answer 1

You can use class provider or factory provider

const serviceProvider = {
  provide: Service,
  useClass:
    version === 1
      ? Service1
      : Service2,
};

@Module({
  providers: [serviceProvider],
})
export class MyModule {}

Answer 2

Javascript dynamic import

something like this

function serviceFactory(){
   return import(`service-${version}`)
};