feat: Convert all query files to JS

packages/backend/src/graphql/queries/get-invoices.ee.js

@@ -0,0 +1,19 @@
+import Billing from '../../helpers/billing/index.ee';
+
+const getInvoices = async (_parent, _params, context) => {
+  const subscription = await context.currentUser.$relatedQuery(
+    'currentSubscription'
+  );
+
+  if (!subscription) {
+    return;
+  }
+
+  const invoices = await Billing.paddleClient.getInvoices(
+    Number(subscription.paddleSubscriptionId)
+  );
+
+  return invoices;
+};
+
+export default getInvoices;