CF7 reCaptcha V3 not working due to JS deferring – FIX

After spending some time investigating the issue I have had with CF7’s reCaptcha V3 integration I’ve found that it was due to the fact that Javascript was being deferred globally.

So, for anyone else who wants to continue deferring JS here’s what I used:

function defer_parsing_of_js( $url ) {
    if ( is_user_logged_in() ) return $url; //don't break WP Admin
    if ( FALSE === strpos( $url, '.js' ) ) return $url;
    if ( strpos( $url, 'jquery.js' ) ) return $url;
    // Dont defer recaptcha
    if ( strpos( $url, 'recaptcha/api.js' ) ) return $url;
    return str_replace( ' src', ' defer src', $url );
}
add_filter( 'script_loader_tag', 'defer_parsing_of_js', 10 );

You can then add additional exceptions for any JS that can’t be deferred for one reason or another. This can also be adapted to load JS asynchronously by switching out ‘defer’ for ‘async’.