wp_enqueue_script missing dependency

When you enqueue simple-pull-quote.js you should set ‘quicktags’ as a dependency since it needs the ‘edButtons’ variable that is created there. Adding one more parameter with to the call takes care of it:

function simplePullQuotes() {
	wp_enqueue_script(
		'simple-pull-quotes',
		plugin_dir_url(__FILE__) . 'simple-pull-quote.js',
		array('quicktags')
	);
}

Without that, the button on the HTML editor doesn’t work if the pull-quote JS is loaded before quicktags. Also, on many pages it causes a JS error which makes the flyout nav not work properly.

Another suggestion would be to write a function to determine if that JS should be loaded (only needed if there’s an editor to add buttons to). After the Deadline adds a button like you, and it uses a function like this to determine if it should:

/* Helper used to check if javascript should be added to page. Helps avoid bloat in admin */
function AtD_should_load_on_page() {
	global $pagenow, $current_screen;

	$pages = array( 'post.php', 'post-new.php', 'page.php', 'page-new.php', 'admin.php', 'profile.php' );

	if ( in_array( $pagenow, $pages ) ) {
		if ( isset( $current_screen->post_type ) && $current_screen->post_type ) {
			return post_type_supports( $current_screen->post_type, 'editor' );
		}
		return true;
	}

	return apply_filters( 'atd_load_scripts', false );
}

https://www.ads-software.com/extend/plugins/simple-pull-quote/