Upgraded app to Laravel 5.7

resources/js/components/chapter-toggle.js

@@ -0,0 +1,33 @@
+import {slideUp, slideDown} from "../services/animations";
+
+class ChapterToggle {
+
+    constructor(elem) {
+        this.elem = elem;
+        this.isOpen = elem.classList.contains('open');
+        elem.addEventListener('click', this.click.bind(this));
+    }
+
+    open() {
+        const list = this.elem.parentNode.querySelector('.inset-list');
+        this.elem.classList.add('open');
+        this.elem.setAttribute('aria-expanded', 'true');
+        slideDown(list, 240);
+    }
+
+    close() {
+        const list = this.elem.parentNode.querySelector('.inset-list');
+        this.elem.classList.remove('open');
+        this.elem.setAttribute('aria-expanded', 'false');
+        slideUp(list, 240);
+    }
+
+    click(event) {
+        event.preventDefault();
+        this.isOpen ?  this.close() : this.open();
+        this.isOpen = !this.isOpen;
+    }
+
+}
+
+export default ChapterToggle;