Add Pinia stores as global properties in Vue3 plugin with Typescript

pinia.ts

import type { App } from 'vue'
import { useAppStore, useAuthStore } from '@/stores'

declare module '@vue/runtime-core' {
  interface ComponentCustomProperties {
    $app: ReturnType<typeof useAppStore>
    $auth: ReturnType<typeof useAuthStore>
  }
}

export default {
  install(app: App) {
    app.config.globalProperties.$app = useAppStore()
    app.config.globalProperties.$auth = useAuthStore()
  }
}