grpc.ts

    const AUTHENTICATION_PROTO_DIR = path.resolve("proto/authentication");

    const authenticationProtoFiles = fs.readdirSync(AUTHENTICATION_PROTO_DIR);

    const authenticationProtoPaths = _.map(authenticationProtoFiles, (f) =>
      path.join(AUTHENTICATION_PROTO_DIR, f)
    );

    const grpc = new GRPCClient(
      authenticationProtoPaths,
      "authentication",
      "Authentication",
      "localhost:50051",
      {
        cert: path.resolve("tls/authentication/server.crt"),
      }
    );
    
    grpc.runService(
      'Hello',
      dataToSend, (err, res) => {
        console.log('Service response 2', res);
        console.log('Service error 2', err);
      }, options
    );