Upgraded app to Laravel 5.7

resources/js/components/sidebar.js

@@ -0,0 +1,16 @@
+
+class Sidebar {
+
+    constructor(elem) {
+        this.elem = elem;
+        this.toggleElem = elem.querySelector('.sidebar-toggle');
+        this.toggleElem.addEventListener('click', this.toggle.bind(this));
+    }
+
+    toggle(show = true) {
+        this.elem.classList.toggle('open');
+    }
+
+}
+
+export default Sidebar;