dotherightthing · May 2, 2020 14:10
diff --git a/remove-blocking-js.php b/remove-blocking-js.php
 /**
 * Deregister only those scripts which are incorrectly output into the head.
 * Then reregister these to load into the footer.
 * This leaves wp_head load actions intact for scripts that we deem worthy (such as GTM).
 *
 * @see http://justintadlock.com/archives/2009/08/06/how-to-disable-scripts-and-styles
 * @example add_action( 'wp_print_scripts', 'wpdtrt_deregister_head_js', 100 );
 */
 function wpdtrt_deregister_head_js() {

 	wp_deregister_script( 'plugin-name' );

 	wp_register_script( 'plugin-name',
 		get_template_directory_uri() . '/js/' . $header . '.min.js',
 		array(),
 		$theme_version,
 		false
 	);
 }

 /**
 * Move blocking JavaScript from <head> to bottom of <body>
 *   Removed as not required when Autoptimize is used
 *
 * @param string $script_hook Script hook.
 * @example wpdtrt_dbth_remove_blocking_js( 'twentysixteen_javascript_detection' );
 * @example add_action( 'after_setup_theme', 'wpdtrt_move_blocking_js' );
 */
 function wpdtrt_move_blocking_js( $script_hook ) {
 	remove_action( 'wp_head', $script_hook, 0 );
 	add_action( 'wp_footer', $script_hook, 0 );
 }

 /**
 * Remove the default WordPress actions that allow any scripts in the document's head
 * As a result, they will naturally be forced to be enqueued in the footer.
 *
 * @link http://stackoverflow.com/a/21167716
 * @link https://www.linkedin.com/pulse/speed-boost-how-move-javascripts-footer-wordpress-john-engle
 * @todo 2 & 3 prevent output of $header into the <head>.
 *  Removing all 3 results in some plugin scripts appearing in <head>.
 *  Could an alternate custom wp_head be set up for this type of usage?
 * @example add_action( 'wp_enqueue_scripts', 'wpdtrt_js_all_to_footer' );
 */
 function wpdtrt_js_all_to_footer() {
 	remove_action( 'wp_head', 'wp_print_scripts' );
 	remove_action( 'wp_head', 'wp_print_head_scripts', 9 );
 	remove_action( 'wp_head', 'wp_enqueue_scripts', 1 );
 	add_action( 'wp_footer', 'wp_print_scripts', 5 );
 	add_action( 'wp_footer', 'wp_enqueue_scripts', 5 );
 	add_action( 'wp_footer', 'wp_print_head_scripts', 5 );
 }

 /**
 * Comment reply
 * Only include a script when it is required in-page
 *
 * @link https://make.wordpress.org/themes/handbook/review/required/
 * @example add_action( 'wp_enqueue_scripts', 'wpdtrt_js_comments' );
 */
 function wpdtrt_js_comments() {
 	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
 		wp_enqueue_script( 'comment-reply' );
 	}
 }