From 865039153f6891154f2dcd4b89fc15e7f95025fe Mon Sep 17 00:00:00 2001
From: Adam Silverstein <adamjs@google.com>
Date: Fri, 6 May 2022 10:12:52 -0600
Subject: [PATCH 1/2] Add a front end JQuery enqueue check

---
 checks/class-jquery-check.php | 55 +++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 checks/class-jquery-check.php

diff --git a/checks/class-jquery-check.php b/checks/class-jquery-check.php
new file mode 100644
index 00000000..6bf2c3c4
--- /dev/null
+++ b/checks/class-jquery-check.php
@@ -0,0 +1,55 @@
+<?php
+/**
+ * Check if JQuery is enqueued on the front end.
+ *
+ * @package Theme Check
+ */
+
+/**
+ * Check if JQuery is enqueued on the front end.
+ */
+class JQuery_Check implements themecheck {
+	/**
+	 * Error messages, warnings and info notices.
+	 *
+	 * @var array $error
+	 */
+	protected $error = array();
+
+	/**
+	 * Check that return true for good/okay/acceptable, false for bad/not-okay/unacceptable.
+	 *
+	 * @param array $php_files File paths and content for PHP files.
+	 * @param array $css_files File paths and content for CSS files.
+	 * @param array $other_files Folder names, file paths and content for other files.
+	 */
+	public function check( $php_files, $css_files, $other_files ) {
+
+		$php = implode( ' ', $php_files );
+
+		checkcount();
+
+		if ( ! preg_match( '/wp_enqueue_script\(\s?("|\')jquery("|\')/i', $php ) ) {
+			$this->error[] = sprintf(
+				'<span class="tc-lead tc-warning">%s</span>: %s',
+				__( 'RECOMMENDED', 'theme-check' ),
+				sprintf(
+					'JQuery is enqueued on the front end, however you may not need it, see <a href="%s">this article</a> for tips on switching to vanilla JavaScript.',
+					'https://tobiasahlin.com/blog/move-from-jquery-to-vanilla-javascript/'
+				)
+			);
+		}
+		return true;
+	}
+
+	/**
+	 * Get error messages from the checks.
+	 *
+	 * @return array Error message.
+	 */
+	public function getError() {
+		return $this->error;
+	}
+}
+
+$themechecks[] = new JQuery_Check();

From 21f0a9142cb145e552c0bb3863b532d4072c0650 Mon Sep 17 00:00:00 2001
From: Adam Silverstein <adamjs@google.com>
Date: Mon, 16 May 2022 12:51:51 -0600
Subject: [PATCH 2/2] Update link, point to make post

---
 checks/class-jquery-check.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/checks/class-jquery-check.php b/checks/class-jquery-check.php
index 6bf2c3c4..150adb99 100644
--- a/checks/class-jquery-check.php
+++ b/checks/class-jquery-check.php
@@ -35,7 +35,7 @@ public function check( $php_files, $css_files, $other_files ) {
 				__( 'RECOMMENDED', 'theme-check' ),
 				sprintf(
 					'JQuery is enqueued on the front end, however you may not need it, see <a href="%s">this article</a> for tips on switching to vanilla JavaScript.',
-					'https://tobiasahlin.com/blog/move-from-jquery-to-vanilla-javascript/'
+					'https://make.wordpress.org/themes/2021/10/04/the-performance-impact-of-using-jquery-in-wordpress-themes/'
 				)
 			);
 		}