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'yarn' : 'npm';\n\n  // FIXME(perry) remove when npm 5 is supported\n  if (!useYarn) {\n    let npmVersion = spawn.sync('npm', ['--version']).stdout.toString().trim();\n\n    if (npmVersion.match(/\\d+/)[0] === '5') {\n      console.log(\n        chalk.yellow(\n          `\n*******************************************************************************\nERROR: npm 5 is not supported yet\n*******************************************************************************\n\nIt looks like you're using npm 5 which was recently released.\n\nCreate React Native App doesn't work with npm 5 yet, unfortunately. We\nrecommend using npm 4 or yarn until some bugs are resolved.\n\nYou can follow the known issues with npm 5 at:\nhttps://github.com/npm/npm/issues/16991\n\n*******************************************************************************\n `\n        )\n      );\n      process.exit(1);\n    }\n  }\n\n  const readmeExists: boolean = await pathExists(path.join(appPath, 'README.md'));\n  if (readmeExists) {\n    await fse.rename(path.join(appPath, 'README.md'), path.join(appPath, 'README.old.md'));\n  }\n\n  const appPackagePath: string = path.join(appPath, 'package.json');\n  const appPackage = JSON.parse(await fse.readFile(appPackagePath));\n\n  // mutate the default package.json in any ways we need to\n  appPackage.main = './node_modules/react-native-scripts/build/bin/crna-entry.js';\n  appPackage.scripts = {\n    start: 'react-native-scripts start',\n    eject: 'react-native-scripts eject',\n    android: 'react-native-scripts android',\n    ios: 'react-native-scripts ios',\n    test: 'node node_modules/jest/bin/jest.js',\n  };\n\n  appPackage.jest = {\n    preset: 'jest-expo',\n  };\n\n  if (!appPackage.dependencies) {\n    appPackage.dependencies = {};\n  }\n\n  if (!appPackage.devDependencies) {\n    appPackage.devDependencies = {};\n  }\n\n  // react-native-scripts is already in the package.json devDependencies\n  // so we need to merge instead of assigning\n  Object.assign(appPackage.dependencies, DEFAULT_DEPENDENCIES);\n  Object.assign(appPackage.devDependencies, DEFAULT_DEV_DEPENDENCIES);\n\n  // Write the new appPackage after copying so that we can include any existing\n  await fse.writeFile(appPackagePath, JSON.stringify(appPackage, null, 2));\n\n  // Copy the files for the user\n  await fse.copy(path.join(ownPath, 'template'), appPath);\n\n  // Rename gitignore after the fact to prevent npm from renaming it to .npmignore\n  try {\n    await fse.rename(path.join(appPath, 'gitignore'), path.join(appPath, '.gitignore'));\n  } catch (err) {\n    // Append if there's already a `.gitignore` file there\n    if (err.code === 'EEXIST') {\n      const data = await fse.readFile(path.join(appPath, 'gitignore'));\n      await fse.appendFile(path.join(appPath, '.gitignore'), data);\n      await fse.unlink(path.join(appPath, 'gitignore'));\n    } else {\n      throw err;\n    }\n  }\n  const { code, command, args } = await install(appPath);\n  if (code !== 0) {\n    console.error('Failed to install');\n    // console.error(`\\`${command} ${args.join(' ')}\\` failed`);\n    return;\n  }\n\n  // display the cleanest way to get to the app dir\n  // if the cwd + appName is equal to the full path, then just cd into appName\n  let cdpath;\n  if (path.resolve(cwd, appName) === appPath) {\n    cdpath = appName;\n  } else {\n    cdpath = appPath;\n  }\n\n  log(\n    `\n\nSuccess! Created ${appName} at ${appPath}\nInside that directory, you can run several commands:\n\n  ${chalk.cyan(npmOrYarn + ' start')}\n    Starts the development server so you can open your app in the Expo\n    app on your phone.\n\n  ${chalk.cyan(npmOrYarn + ' run ios')}\n    (Mac only, requires Xcode)\n    Starts the development server and loads your app in an iOS simulator.\n\n  ${chalk.cyan(npmOrYarn + ' run android')}\n    (Requires Android build tools)\n    Starts the development server and loads your app on a connected Android\n    device or emulator.\n\n  ${chalk.cyan(npmOrYarn + ' test')}\n    Starts the test runner.\n\n  ${chalk.cyan(npmOrYarn + ' run eject')}\n    Removes this tool and copies build dependencies, configuration files\n    and scripts into the app directory. If you do this, you can’t go back!\n\nWe suggest that you begin by typing:\n\n  ${chalk.cyan('cd ' + cdpath)}\n  ${chalk.cyan(npmOrYarn + ' start')}`\n  );\n\n  if (readmeExists) {\n    log(\n      `\n${chalk.yellow('You had a `README.md` file, we renamed it to `README.old.md`')}`\n    );\n  }\n\n  log();\n  log('Happy hacking!');\n};\n"]}