Google Font display swap in Autoptimize?

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Autoptimize 2.5.1 (out earlier this week) does not have an option to enforce font-display on Google Fonts just yet, but this little code snippet does exactly that;

add_filter('autoptimize_filter_extra_gfont_fontstring','add_display');
function add_display($in) {
  return $in.'&display=swap';
}

Happy swapping (or fallback-ing or optional-ing) 🙂