function getInstallPackage()

in packages/create-react-app/createReactApp.js [547:595]

• 45 lines of code
• 10 McCabe index (conditional complexity)

function getInstallPackage(version, originalDirectory) {
  let packageToInstall = 'react-scripts';
  const validSemver = semver.valid(version);
  if (validSemver) {
    packageToInstall += `@${validSemver}`;
  } else if (version) {
    if (version[0] === '@' && !version.includes('/')) {
      packageToInstall += version;
    } else if (version.match(/^file:/)) {
      packageToInstall = `file:${path.resolve(
        originalDirectory,
        version.match(/^file:(.*)?$/)[1]
      )}`;
    } else {
      // for tar.gz or alternative paths
      packageToInstall = version;
    }
  }

  const scriptsToWarn = [
    {
      name: 'react-scripts-ts',
      message: chalk.yellow(
        `The react-scripts-ts package is deprecated. TypeScript is now supported natively in Create React App. You can use the ${chalk.green(
          '--template typescript'
        )} option instead when generating your app to include TypeScript support. Would you like to continue using react-scripts-ts?`
      ),
    },
  ];

  for (const script of scriptsToWarn) {
    if (packageToInstall.startsWith(script.name)) {
      return prompts({
        type: 'confirm',
        name: 'useScript',
        message: script.message,
        initial: false,
      }).then(answer => {
        if (!answer.useScript) {
          process.exit(0);
        }

        return packageToInstall;
      });
    }
  }

  return Promise.resolve(packageToInstall);
}