Nuxt/docs/3.api/6.commands/build.md

title	description
nuxi build	Build your Nuxt application.

nuxi build

npx nuxi build [--prerender] [--dotenv] [--log-level] [rootDir]

The build command creates a .output directory with all your application, server and dependencies ready for production.

Option	Default	Description
rootDir	.	The root directory of the application to bundle.
--prerender	false	Pre-render every route of your application. (note: This is an experimental flag. The behavior might be changed.)
--dotenv	.	Point to another .env file to load, relative to the root directory.

This command sets process.env.NODE_ENV to production.