TS: Custom typed PageMeta not working

layouts/default.vue:9:69 - error TS18046: '__VLS_ctx.route.meta.backTo' is of type 'unknown'.

declare module '#app' {
  interface PageMeta {
    backTo?: {
      to: string
      text: string
    }
  }
}

// It is always important to ensure you import/export something when augmenting a type
export {}