// removes JQMIGRATE: jQuery.browser is deprecated
add_action('wp_default_scripts', function ($scripts) {
if (!empty($scripts->registered['jquery'])) {
$scripts->registered['jquery']->deps = array_diff($scripts->registered['jquery']->deps, ['jquery-migrate']);
}
});
מקור:
https://wordpress.stackexchange.com/questions/224661/annoying-jqmigrate-migrate-is-in-console-after-update-to-wordpress-4-5