_post_meta( $post->ID, '_rocket_exclude_async_css', true ) ) {
			$this->disabled_data['option_excluded'] = 1;
		}

		if ( ! is_post_type_viewable( get_post_type( $post ) ) ) {
			$this->disabled_data['not_viewable'] = 1;
		}

		return $this->disabled_data;
	}

	/**
	 * Checks if critical CSS generation is enabled for the current post.
	 *
	 * @since 3.6
	 *
	 * @return bool
	 */
	private function is_enabled() {
		return ! empty( $this->get_disabled_data() );
	}

	/**
	 * Returns the reason why actions are disabled.
	 *
	 * @since 3.6
	 *
	 * @return string
	 */
	private function get_disabled_description() {
		global $post;

		$disabled_data = $this->get_disabled_data();

		if ( empty( $disabled_data ) ) {
			return '';
		}

		if ( isset( $disabled_data['not_viewable'] ) ) {
			return __( 'This feature is not available for non-public post types.', 'rocket' );
		}

		$notice = __( '%l to use this feature.', 'rocket' );
		$list   = [
			// translators: %s = post type.
			'not_published'   => sprintf( __( 'Publish the %s', 'rocket' ), $post->post_type ),
			'option_disabled' => __( 'Enable Load CSS asynchronously in WP Rocket settings', 'rocket' ),
			'option_excluded' => __( 'Enable Load CSS asynchronously in the options above', 'rocket' ),
		];

		return wp_sprintf_l( $notice, array_intersect_key( $list, $disabled_data ) );
	}

	/**
	 * Checks if a specific critical css file exists for the current post.
	 *
	 * @since 3.6
	 *
	 * @return bool
	 */
	private function cpcss_exists() {
		global $post;

		$post_cpcss = "{$this->critical_css_path}{$post->post_type}-{$post->ID}.css";

		return rocket_direct_filesystem()->exists( $post_cpcss );
	}
}