[ticket/16775] Run xo linter in GitHub Actions runs

PHPBB3-16775

.github/check-js.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# This file is part of the phpBB Forum Software package.
+#
+# @copyright (c) phpBB Limited <https://www.phpbb.com>
+# @license GNU General Public License, version 2 (GPL-2.0)
+#
+# For full copyright and license information, please see
+# the docs/CREDITS.txt file.
+#
+set -e
+set +x
+
+sudo npm install -g > /dev/null
+npm ci > /dev/null
+set -x
+node_modules/xo/cli.js "phpBB/adm/style/*.js"
+node_modules/xo/cli.js "phpBB/assets/javascript/*.js"
+node_modules/xo/cli.js "phpBB/style/all/js/*.js"
+node_modules/xo/cli.js "phpBB/style/prosilver/template/*.js"

.github/workflows/tests.yml

@@ -84,6 +84,10 @@ jobs:
               run: |
                   .github/check-stylesheet.sh
 
+            - name: Lint JavaScript files
+              run: |
+                  .github/check-js.sh
+
             - name: Check commit message
               if: github.event_name == 'pull_request'
               run: |