text: #!/usr/bin/env node
  /**
   * @license
   * Copyright 2018 The Closure Library Authors. All Rights Reserved.
   *
   * 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.
   */
  
  /**
   * @fileoverview Reads JS from stdin and then outputs the language version of
   * the given JS (e.g. "es6").
   */
  
  const parser = require('../lib/parser');
  const readline = require('readline');
  
  const rl = readline.createInterface({input: process.stdin});
  
  const lines = [];
  
  rl.on('line', (line) => {
    lines.push(line);
  });
  
  rl.on('close', () => {
    const result = parser.parseText(lines.join('\n'), 'stdin');
    let fatal = false;
    for (const error of result.errors) {
      fatal = fatal || error.fatal;
      console.error(error.toString());
    }
    if (!fatal) {
      console.log(result.dependencies[0].language);
    }
  });
  