Critical CSS in Twig

critical.twig

{% set styleSite = rev("css/style.css") %}
{% if stylesLoaded == true %}
    <link rel="stylesheet" href="{{ styleSite }}" />
{% else -%}

    <style>{{ craft.inlin.er('/assets/css/critical/' ~ critical ~ '.css') | raw  }}</style>

    {% include 'includes/scripts/_async-assets' only %}

    <script>
        var stylesheet = loadCSS('{{ styleSite }}');
        onloadCSS( stylesheet, function() {
            document.cookie = "css-loaded=1;";
        });
    </script>

    <noscript>
        <link rel="stylesheet" href="{{ styleSite }}" />
    </noscript>
{% endif %}