Jetpack_Custom_CSS_Enhancements::wp_enqueue_scripts PHP Method

    public static function wp_enqueue_scripts()
    {
        if (is_customize_preview()) {
            wp_enqueue_script('jetpack-customizer-css-preview');
            wp_localize_script('jetpack-customizer-css-preview', 'jpCustomizerCssPreview', array('preprocessors' => apply_filters('jetpack_custom_css_preprocessors', array())));
        }
    }