npx nuxi@latest module add prepare

// `nuxt.config.ts`
export default defineNuxtConfig({
  modules: ['nuxt-prepare']
})

// `server.prepare.ts`
import { defineNuxtPrepareHandler } from 'nuxt-prepare/config'

export default defineNuxtPrepareHandler(async () => {
  // Do some async magic here, e.g. fetch data from an API

  return {
    // Overwrite the runtime config variable `foo`
    runtimeConfig: {
      public: {
        foo: 'Overwritten by "server.prepare" script'
      }
    },

    // Pass custom state to Nuxt and import it
    // anywhere from `#nuxt-prepare`
    state: {
      foo: 'bar'
    }
  }
})