How to configure ElasticBeanstalk container command into .ebextensions

Question

I have deployed my react SSR app to ElasticBeanstalk, before running npm start there should be command to run "npm run-script build" to make a build, but unfortunately npm start is running and app crashes due to no code build found on server, I setup .ebextension to run container command.

.ebextensions container-command.config

here my code is

commands:
deploy:
  command: "npm run-script build"
  leader_only: true

command is not running on server I am facing error

Error: Could not find a valid build in the '/var/app/current/.next' directory! Try building your app with 'next build' before starting the server. at Server.readBuildId (/var/app/current/node_modules/next-server/dist/server/next-server.js:435:23) at new Server (/var/app/current/node_modules/next-server/dist/server/next-server.js:44:29) at module.exports (/var/app/current/node_modules/next-server/index.js:4:10) at module.exports (/var/app/current/node_modules/next/dist/server/next.js:2:161) at start (/var/app/current/node_modules/next/dist/server/lib/start-server.js:1:323) at nextStart (/var/app/current/node_modules/next/dist/cli/next-start.js:22:125) at /var/app/current/node_modules/next/dist/bin/next:29:346

You should build your app outside of your production environment. Then deploy it already built to elastic beanstalk. — Bertrand Marron, May 10 '20 at 13:53
well this is not good practice at all, when we deploy app it should run build command to install code on server otherwise we need to upload node_modules as well. — Amit Shakya, May 10 '20 at 13:59
Yes. This is why https://hub.docker.com/_/amazonlinux exists. — Bertrand Marron, May 10 '20 at 15:25

How to configure ElasticBeanstalk container command into .ebextensions

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