Programmatically get cart object in Shopify

get-cart.liquid

<script>
  const cartRoute = '{{ routes.cart_url | append: '.js' }}';

  function forceCartUpdate() {
    var getCartForce = function() {
      var url = ''.concat(cartRoute, '?t=').concat(Date.now());
      return fetch(url, {
        credentials: 'same-origin',
        method: 'GET'
      }).then(response => response.json());
    };
    getCartForce().then(function(cart) {
      console.log(cart);
      document.dispatchEvent(new CustomEvent('cart:updated', {
        detail: {
          cart: cart
        }
      }));
    });
  }
</script>