db.get is not a function and other methods

[Taisyon]

<script type="module">
    import { openDB } from 'https://unpkg.com/idb?module';
    const db = openDB('my', 1);
    alert(db.get('price', 1));
    const store = db.transaction('price').objectStore('price');
    const value = store.get(35);
    alert(value);
</script>

As you can see, I did the code according to the instructions, but in any modern browser it writes an error

[jakearchibald]

This isn't according to the instructions. Many of those methods return promises.