@jill64/svelte-storage

<script>
  import { storage } from '@jill64/svelte-storage'

  const local = storage('localStorage-key')
  const session = storage('sessionStorage-key', {
    sessionStorage: true
  })
</script>

Persisted in LocalStorage   <input bind:value={$local} />
Persisted in SessionStorage <input bind:value={$session} />