title: Type a property in a store explicitly?
body: <p>In a Pinia store, how can one explicitly type a property?</p>
  <pre><code>import { defineStore } from 'pinia'
  
  export const useNotifyStore = defineStore('NotifyStore', {
    state: () =&gt; ({
      message: '',
      type: '', // only 'warning', 'error', 'success' shall be allowed values -&gt; how can I specify that?
    }),
  })
  </code></pre>