code: function createPluginInstalledFlag(ctx) {
    var pathToInstallFlag = path.join(ctx.opts.projectRoot, 'plugins', ctx.opts.plugin.id, INSTALLATION_FLAG_FILE_NAME);
  
    fs.closeSync(fs.openSync(pathToInstallFlag, 'w'));
  }
docs: Create empty file - indicator, that we tried to install dependency modules after installation.
  We have to do that, or this hook is gonna be called on any plugin installation.