Interceptors

There is no difference between regular interceptors and microservices interceptors. The following example uses a manually instantiated method-scoped interceptor. Just as with HTTP based applications, you can also use controller-scoped interceptors (i.e., prefix the controller class with a @UseInterceptors() decorator).

@@filename()
@UseInterceptors(new TransformInterceptor())
@MessagePattern({ cmd: 'sum' })
accumulate(data: number[]): number {
  return (data || []).reduce((a, b) => a + b);
}
@@switch
@UseInterceptors(new TransformInterceptor())
@MessagePattern({ cmd: 'sum' })
accumulate(data) {
  return (data || []).reduce((a, b) => a + b);
}