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Preload any footer JS files in the header
/**
* Preload any footer JS files in the header
*
* originally from: https://macarthur.me/posts/preloading-javascript-in-wordpress
*/
add_action('wp_head', function () {
global $wp_scripts;
foreach($wp_scripts->queue as $handle) {
$script = $wp_scripts->registered[$handle];
//-- check if group exists
if (isset($script->extra['group'])) {
//-- Weird way to check if script is being enqueued in the footer.
if( $script->extra['group'] == 1) {
//-- If version is set, append to end of source.
$source = $script->src . ($script->ver ? "?ver={$script->ver}" : "");
//-- Spit out the tag.
echo "<link rel='preload' href='{$source}' as='script'/>\n";
}
}
}
}, 1);
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