Nuxt/docs/content/3.api/5.commands/build.md

nuxi build

npx nuxi build [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.)

This command sets process.env.NODE_ENV to production. To override, define NODE_ENV in a .env file or as command-line argument.