プラグインとミドルウェア

export default (ctx, inject) => {
  inject('injected', () => 'my injected function')
}

export default defineNuxtPlugin((nuxtApp) => {
  // now available on `nuxtApp.$injected`
  nuxtApp.provide('injected', () => 'my injected function')

  // You can alternatively use this format, which comes with automatic type support
  return {
    provide: {
      injected: () => 'my injected function',
    },
  }
})

export default function ({ store, redirect }) {
  // If the user is not authenticated
  if (!store.state.authenticated) {
    return redirect('/login')
  }
}

export default defineNuxtRouteMiddleware((to, from) => {
  const auth = useState('auth')
  if (!auth.value.authenticated) {
    return navigateTo('/login')
  }
})