Initial line item idea

assets/javascripts/index.js

@@ -0,0 +1,9 @@
+document.addEventListener("DOMContentLoaded", () => {
+  if (typeof Stimulus === "undefined") {
+    console.error("Stimulus is not loaded. Make sure the UMD script is included first.");
+    return;
+  }
+
+  const application = Stimulus.Application.start();
+  application.register("nested-form", window.NestedFormController);
+});