text: const serve = require('koa-static');
  const Koa = require('koa');
  const app = new Koa();
  
  // $ GET /package.json
  app.use(serve('.'));
  
  // $ GET /hello.txt
  app.use(serve('./web'));
  
  // or use absolute paths
  //app.use(serve(__dirname + '/test/fixtures'));
  
  app.listen(3000);
  
  console.log('listening on port 3000');