app.js

// run via: babel-node app.js
'use strict';

import Koa from 'koa';
import route from 'koa-route';

import {Users} from './controllers/users'

export const app = module.exports = new Koa();

app.use(route.get('/users', Users.list));
app.use(route.get('/users/:id', Users.detail));

if (!module.parent) {
  app.listen(3000, function() {
    console.log('Listen on: 3000');
  });
}

server.js

// run via: node server.js
'use strict';
require('babel-core/register');
require('babel-polyfill');

const app = require('./app');

app.listen(3000);

users.js

'use strict';

export class Users {
  static list(ctx) {
    ctx.body = 'users list';
  }

  static async detail(ctx, id, next) {
    await next();
    ctx.body = id;
  }


}