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src/web/app/common/scripts/loading.js

+const NProgress = require('nprogress');
+NProgress.configure({
+	trickleSpeed: 500,
+	showSpinner: false
+});
+
+const root = document.getElementsByTagName('html')[0];
+
+module.exports = {
+	start: () => {
+		root.classList.add('progress');
+		NProgress.start();
+	},
+	done: () => {
+		root.classList.remove('progress');
+		NProgress.done();
+	},
+	set: val => {
+		NProgress.set(val);
+	}
+};

src/web/app/common/scripts/loading.ls

-NProgress = require \nprogress
-NProgress.configure do
-	trickle-speed: 500ms
-	show-spinner: false
-
-root = document.get-elements-by-tag-name \html .0
-
-module.exports =
-	start: ~>
-		root.class-list.add \progress
-		NProgress.start!
-	done: ~>
-		root.class-list.remove \progress
-		NProgress.done!
-	set: (val) ~>
-		NProgress.set val