code: function cleanInstallFolder(rushCommonFolder, packageInstallFolder) {
      try {
          const flagFile = path.resolve(packageInstallFolder, INSTALLED_FLAG_FILENAME);
          if (fs.existsSync(flagFile)) {
              fs.unlinkSync(flagFile);
          }
          const packageLockFile = path.resolve(packageInstallFolder, 'package-lock.json');
          if (fs.existsSync(packageLockFile)) {
              fs.unlinkSync(packageLockFile);
          }
          const nodeModulesFolder = path.resolve(packageInstallFolder, NODE_MODULES_FOLDER_NAME);
          if (fs.existsSync(nodeModulesFolder)) {
              const rushRecyclerFolder = ensureAndJoinPath(rushCommonFolder, 'temp', 'rush-recycler', `install-run-${Date.now().toString()}`);
              fs.renameSync(nodeModulesFolder, rushRecyclerFolder);
          }
      }
      catch (e) {
          throw new Error(`Error cleaning the package install folder (${packageInstallFolder}): ${e}`);
      }
  }
docs: Removes the following files and directories under the specified folder path:
  - installed.flag
  -
  - node_modules