fix: add extension to import

Author: MarkNerdi

src/lib/index.js

@@ -1,6 +1,6 @@
 import Component, { config } from './components/SveltyPicker.svelte';
 
-export { parseDate, formatDate } from './utils/dateUtils';
+export { parseDate, formatDate } from './utils/dateUtils.js';
 
 export default Component;
 export { config };