style(senna): lint examples

Author: izaera

maintenance/projects/senna/examples/form/server.js

@@ -14,14 +14,14 @@ var upload = multer();
 
 app.use(express.static('../../'));
 
-app.post('/post', upload.array(), (req, res, next) => {
+app.post('/post', upload.array(), (req, res, _next) => {
 	var content = '<div id="result1">';
 	content += JSON.stringify(req.body, 5);
 	content += '</div>';
 	res.end(content);
 });
 
-app.post('/post-get', upload.array(), (req, res, next) => {
+app.post('/post-get', upload.array(), (_req, res, _next) => {
 	res.redirect('/examples/form/redirect.html');
 });
 

maintenance/projects/senna/examples/ga/tracker.js

@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+/* global ga */
+
 // https://developers.google.com/analytics/devguides/collection/analyticsjs/single-page-applications
 
 document.addEventListener('DOMContentLoaded', () => {

maintenance/projects/senna/examples/gallery/js/dynamic.js

@@ -56,6 +56,8 @@ document.addEventListener('DOMContentLoaded', () => {
 						return getContent('06', '07', '08');
 					case '/examples/gallery/img/08.jpg':
 						return getContent('07', '08', '01');
+					default:
+						return undefined;
 				}
 			}
 		};