throw new RpcException('Invalid credentials.');

import { Catch, RpcExceptionFilter, ArgumentsHost } from '@nestjs/common';
import { Observable, throwError } from 'rxjs';
import { RpcException } from '@nestjs/microservices';

@Catch(RpcException)
export class ExceptionFilter implements RpcExceptionFilter<RpcException> {
 catch(exception: RpcException, host: ArgumentsHost): Observable<any> {
   return throwError(() => exception.getError());
 }
}

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

import { Catch, ArgumentsHost } from '@nestjs/common';
import { BaseRpcExceptionFilter } from '@nestjs/microservices';

@Catch()
export class AllExceptionsFilter extends BaseRpcExceptionFilter {
  catch(exception: any, host: ArgumentsHost) {
    return super.catch(exception, host);
  }
}