Svelte image preview

<script> 
	let files
	let preview_image = ""
	
	$:  { 
		if (files) {
		  const reader = new FileReader();
			
	    reader.onload = (readerEvent) => {
	      const base64Image = readerEvent.target.result;
	     preview_image = base64Image
	    };
			
	    reader.readAsDataURL(files[0]); // Read the file as data URL
	  }
	}
</script>

<input accept="image/*" type="file" bind:files />
{#if files}
	<img src={preview_image} alt="placeholder">
{/if}