checkRequiredFiles.js

// @remove-on-eject-begin
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
// @remove-on-eject-end

const fs = require('fs');
const path = require('path');
const chalk = require('chalk');
const paths = require('../../config/paths');

function checkRequiredFiles() {
  const filesPathToCheck = [paths.appHtml, paths.appIndexJs];
  filesPathToCheck.forEach(filePath => {
    try {
      fs.accessSync(filePath, fs.F_OK);
    } catch (err) {
      const dirName = path.dirname(filePath);
      const fileName = path.basename(filePath);
      console.log(chalk.red('Could not find a required file.'));
      console.log(chalk.red('  Name: ') + chalk.cyan(fileName));
      console.log(chalk.red('  Searched in: ') + chalk.cyan(dirName));
      process.exit(1);
    }
  });
}

module.exports = checkRequiredFiles;