add typescript support in svelte files, .js to .ts

src/lib/helper/caseNumberOccupied.ts

@@ -0,0 +1,22 @@
+import { client } from '$lib/minio';
+
+/**
+ * Check if caseNumber is used
+ * @param {string} caseNumber
+ * @returns {Promise<boolean}
+ */
+export default async function caseNumberOccupied(caseNumber) {
+	const prefix = `${caseNumber}/config.json`;
+	const promise = new Promise((resolve) => {
+		let stream = client.listObjectsV2('tatort', prefix, false, '');
+		stream.on('data', () => {
+			stream.destroy();
+			resolve(true);
+		});
+		stream.on('end', () => {
+			resolve(false);
+		});
+	});
+
+	return promise;
+}