Function run

packages/create-react-app/createReactApp.js:396–545

(
  root,
  appName,
  version,
  verbose,
  originalDirectory,
  template,
  useYarn,
  usePnp
)

}

function run(
  root,
  appName,
  version,
  verbose,
  originalDirectory,
  template,
  useYarn,
  usePnp
) {
  Promise.all([
    getInstallPackage(version, originalDirectory),
    getTemplateInstallPackage(template, originalDirectory),
  ]).then(([packageToInstall, templateToInstall]) => {
    const allDependencies = ['react', 'react-dom', packageToInstall];

    console.log('Installing packages. This might take a couple of minutes.');

    Promise.all([
      getPackageInfo(packageToInstall),
      getPackageInfo(templateToInstall),
    ])
      .then(([packageInfo, templateInfo]) =>
        checkIfOnline(useYarn).then(isOnline => ({
          isOnline,
          packageInfo,
          templateInfo,
        }))
      )
      .then(({ isOnline, packageInfo, templateInfo }) => {
        let packageVersion = semver.coerce(packageInfo.version);

        const templatesVersionMinimum = '3.3.0';

        // Assume compatibility if we can't test the version.
        if (!semver.valid(packageVersion)) {
          packageVersion = templatesVersionMinimum;
        }

        // Only support templates when used alongside new react-scripts versions.
        const supportsTemplates = semver.gte(
          packageVersion,
          templatesVersionMinimum
        );
        if (supportsTemplates) {
          allDependencies.push(templateToInstall);
        } else if (template) {
          console.log('');
          console.log(
            `The ${chalk.cyan(packageInfo.name)} version you're using ${
              packageInfo.name === 'react-scripts' ? 'is not' : 'may not be'
            } compatible with the ${chalk.cyan('--template')} option.`
          );
          console.log('');
        }

        console.log(
          `Installing ${chalk.cyan('react')}, ${chalk.cyan(