text: /**
  * Copyright 2019 The AMPHTML Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  const express = require('express');
  const app = express();
  
  app.use('/', require('./backend/'));
  
  const port = 8080;
  
  app.listen(port, () => console.log(`Playground listening on port ${port}!`));
  