Nuxtjs Guideline: Middleware — Use defineNuxtRouteMiddleware. Description: Define route middleware properly. Do: defineNuxtRouteMiddleware wrapper. Don't: export default function. Good Example: export default defineNuxtRouteMiddleware((to, from) => {}). Bad Example: export default function(to, from) {}. Severity: High. Docs: https://nuxt.com/docs/guide/directory-structure/middleware.