Describe the bug

There's no svelte-check error when binding to a property if the property is a broader type.

To Reproduce

<script lang="ts">
  import MyComponent from './MyComponent.svelte'
  let value: Date
  $: console.log('value:', value)
</script>

<MyComponent bind:value />

MyComponent.svelte:

<script lang="ts">
  export let value: Date | null = null
</script>

{JSON.stringify(value)}

Expected behavior

There should be a type error because value is defined as Date even though it can also be null

System

• OS: macOS
• IDE: VSCode
• Plugin/Package: "Svelte for VSCode", svelte-check, svelte2tsx