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The nuxt.config file extension can either be .js, .ts or .mjs.
nuxt.config.ts
export default defineNuxtConfig({
  // My Nuxt config
})
defineNuxtConfig helper is globally available without import.
You can explicitly import defineNuxtConfig from nuxt/config if you prefer:
nuxt.config.ts
import { defineNuxtConfig } from 'nuxt/config'

export default defineNuxtConfig({
  // My Nuxt config
})

Nuxt Configuration Documentation

Discover all the available options in the Nuxt configuration documentation.
To ensure your configuration is up to date, Nuxt will make a full restart when detecting changes in the main configuration file, the .env, .nuxtignore and .nuxtrc dotfiles.