TwentyTwenty_Script_Loader

20	class TwentyTwenty_Script_Loader {21 22		/**23		 * Migrates legacy async/defer script data which might be used by child themes.24		 *25		 * This method is used on the `print_scripts_array` filter.26		 *27		 * @since Twenty Twenty 2.028		 *29		 * @param string[] $to_do An array of script dependency handles.30		 * @return string[] Unchanged array of script dependency handles.31		 */32		public function migrate_legacy_strategy_script_data( $to_do ) {33			foreach ( $to_do as $handle ) {34				foreach ( array( 'async', 'defer' ) as $strategy ) {35					if ( wp_scripts()->get_data( $handle, $strategy ) ) {36						wp_script_add_data( $handle, 'strategy', $strategy );37					}38				}39			}40			return $to_do;41		}42 43		/**44		 * Adds async/defer attributes to enqueued / registered scripts.45		 *46		 * Now that #12009 has landed in WordPress 6.3, this method is only used for older versions of WordPress.47		 * This method is used on the `script_loader_tag` filter.48		 *49		 * @since Twenty Twenty 1.050		 *51		 * @link https://core.trac.wordpress.org/ticket/1200952		 *53		 * @param string $tag    The script tag.54		 * @param string $handle The script handle.55		 * @return string Script HTML string.56		 */57		public function filter_script_loader_tag( $tag, $handle ) {58			$strategies = array(59				'async' => (bool) wp_scripts()->get_data( $handle, 'async' ),60				'defer' => (bool) wp_scripts()->get_data( $handle, 'defer' ),61			);62			$strategy   = wp_scripts()->get_data( $handle, 'strategy' );63			if ( $strategy && isset( $strategies[ $strategy ] ) ) {64				$strategies[ $strategy ] = true;65			}66 67			foreach ( array_keys( array_filter( $strategies ) ) as $attr ) {68 69				// Prevent adding attribute when already added in #12009.70				if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) {71					$tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 );72				}73				// Only allow async or defer, not both.74				break;75			}76			return $tag;77		}78	}