caller.js

import ht from "hudson-taylor";

import methods from "./methods";

let transport = new ht.Transports.Local();

let service = new ht.Service(transport);
let client = new ht.Client({
 s: transport
});

methods(service);

client.call('s', 'echo', 'hello world', function(err, data) {
  console.log(err, data); // null 'hello world'
});

methods.js

import { expose } from "ht-decorators";

export default function(service) {

  class methods {

    @expose(service)
    echo(data, callback) {
      return callback(null, data);
    }

  }

  new methods();

}