Atlassian connect express ( React jsx ) from developement to production

Hello !
a have developed a react jsx app with ACE folowng those steps https://developer.atlassian.com/cloud/jira/platform/build-a-jira-app-using-a-framework/ , now i fineshed all developement and test and i want to build my app for production , i mean i want to deploy my app on my server and listed later on atlassian market place , i tried to run
npm run build but i have no build folder
please any help about how to build my app for production