Woocommerce Mini Cart with ajax count update

function.php

<?php
/**
 * @title: WC Mini Cart
 * @usage: echo do_shortcode( '[xcminicart]' );
 */

if ( ! class_exists( 'WooCommerce' ) ) {
	return;
}

new XCMiniCart();

class XCMiniCart {

	function __construct() {
		add_action('init', [$this,'wp_init']);
	}

	function wp_init(){
		add_filter( 'woocommerce_add_to_cart_fragments', [ $this, 'my_header_add_to_cart_fragment' ] );
		add_shortcode( 'xcminicart', [ $this, 'html' ] );
    }

	function html() {
		ob_start();
		?>
        <div class="mini-cart" id="mini-cart">
			<?= $this->html_fragment_cart_icon() ?>
            <div class="mini-cart__content">
				<?php woocommerce_mini_cart(); ?>
            </div>
        </div>
		<?php
		return ob_get_clean();
	}

	function html_fragment_cart_icon() {
		ob_start();
		$count = WC()->cart->cart_contents_count;
		?>
        <a class="mini-cart__button cart-contents" href="<?php echo WC()->cart->get_cart_url(); ?>"
           title="<?php _e( 'View your shopping cart' ); ?>">
            <span class="button-icon">
                <i class="fa fa-shopping-cart" aria-hidden="true"></i>
               <?php if ( $count > 0 ) {
	               echo '<span class="cart-contents-count count">' . $count . '</span>';
               } ?>
            </span>
        </a>
		<?php
		return ob_get_clean();
	}

	/**
	 * Ensure cart contents update when products are added to the cart via AJAX
	 */
	function my_header_add_to_cart_fragment( $fragments ) {
		$fragments['a.cart-contents'] = $this->html_fragment_cart_icon();
		return $fragments;
	}
}