cra.js

#!/usr/bin/env node
/**
 * Copyright (c) 2015-present, Facebook, Inc. 
 * 
 * This source code is licensed under the MIT license found in the 
 * LICENSE file in the root directory of this source tree. 
 */

'use strict';

const fs = require('fs');
const path = require('path');
const cp = require('child_process');

const cleanup = () => {
  console.log('Cleaning up.');
  // Uncomment when snapshot testing is enabled by default:
  // rm ./template/src/__snapshots__/App.test.js.snap
};

const handleExit = () => {
  cleanup();
  console.log('Exiting without error.');
  process.exit();
};

const handleError = e => {
  console.error('ERROR! An error was encountered while executing\n', e);
  cleanup();
  console.log('Exiting with error.');
  process.exit(1);
};

process.on('SIGINT', handleExit);
process.on('uncaughtException', handleError);

// ******************************************************************************
// Pack react- scripts so we can verify they work.
// ******************************************************************************

const rootDir = path.join(__dirname, '..');
const reactScriptsDir = path.join(rootDir, 'packages', 'react-scripts');
const packageJsonPath = path.join(reactScriptsDir, 'package.json');
const packageJsonOrigPath = path.join(reactScriptsDir, 'package.json.orig');

// Install all our packages
const lernaPath = path.join(rootDir, 'node_modules', '.bin', 'lerna');
cp.execSync(`${lernaPath} bootstrap`, {
  cwd: rootDir,
  stdio: 'inherit',
});

// Save package.json because we're going to touch it
fs.writeFileSync(packageJsonOrigPath, fs.readFileSync(packageJsonPath));

// Replace own dependencies (those in the`packages` dir) with the local paths
// of those packages
const replaceOwnDepsPath = path.join(__dirname, 'replace-own-deps.js');
cp.execSync(`node ${replaceOwnDepsPath}`, { stdio: 'inherit' });

// Finally, pack react-scripts
// Don't redirect stdio as we want to capture the output that will be returned
// from execSync(). In this case it will be the .tgz filename.
const scriptsFileName = cp
  .execSync(`npm pack`, { cwd: reactScriptsDir })
  .toString()
  .trim();
const scriptsPath = path.join(
  rootDir,
  'packages',
  'react-scripts',
  scriptsFileName
);

// Restore package.json
fs.unlinkSync(packageJsonPath);
fs.writeFileSync(packageJsonPath, fs.readFileSync(packageJsonOrigPath));
fs.unlinkSync(packageJsonOrigPath);

// ******************************************************************************
// Now that we have packed them, call the global CLI.
// ******************************************************************************

// If Yarn is installed, clean its cache because it may have cached react-scripts
try {
  cp.execSync('yarn cache clean');
} catch (e) {
  // We can safely ignore this as the user doesn't have yarn installed
}

const args = process.argv.slice(2);

// Now run the CRA command
const craScriptPath = path.join(
  rootDir,
  'packages',
  'create-react-app',
  'index.js'
);
cp.execSync(
  `node ${craScriptPath} --scripts-version="${scriptsPath}" ${args.join(' ')}`,
  {
    cwd: rootDir,
    stdio: 'inherit',
  }
);

// Cleanup
handleExit();