v12 (#5712)

Co-authored-by: MeiMei <30769358+mei23@users.noreply.github.com>
Co-authored-by: Satsuki Yanagi <17376330+u1-liquid@users.noreply.github.com>

src/client/scripts/loading.ts

@@ -0,0 +1,21 @@
+import * as NProgress from 'nprogress';
+NProgress.configure({
+	trickleSpeed: 500,
+	showSpinner: false
+});
+
+const root = document.getElementsByTagName('html')[0];
+
+export default {
+	start: () => {
+		root.classList.add('progress');
+		NProgress.start();
+	},
+	done: () => {
+		root.classList.remove('progress');
+		NProgress.done();
+	},
+	set: val => {
+		NProgress.set(val);
+	}
+};