khaihihi

wp-content/themes/twentytwenty/classes/class-twentytwenty-script-loader.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Javascript Loader Class
+ *
+ * Allow `async` and `defer` while enqueuing Javascript.
+ *
+ * Based on a solution in WP Rig.
+ *
+ * @package WordPress
+ * @subpackage Twenty_Twenty
+ * @since 1.0.0
+ */
+
+if ( ! class_exists( 'TwentyTwenty_Script_Loader' ) ) {
+	/**
+	 * A class that provides a way to add `async` or `defer` attributes to scripts.
+	 */
+	class TwentyTwenty_Script_Loader {
+
+		/**
+		 * Adds async/defer attributes to enqueued / registered scripts.
+		 *
+		 * If #12009 lands in WordPress, this function can no-op since it would be handled in core.
+		 *
+		 * @link https://core.trac.wordpress.org/ticket/12009
+		 *
+		 * @param string $tag    The script tag.
+		 * @param string $handle The script handle.
+		 * @return string Script HTML string.
+		 */
+		public function filter_script_loader_tag( $tag, $handle ) {
+			foreach ( [ 'async', 'defer' ] as $attr ) {
+				if ( ! wp_scripts()->get_data( $handle, $attr ) ) {
+					continue;
+				}
+				// Prevent adding attribute when already added in #12009.
+				if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) {
+					$tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 );
+				}
+				// Only allow async or defer, not both.
+				break;
+			}
+			return $tag;
+		}
+
+	}
+}