Shopify Segment init

gistfile1.js

window.ShopifyAnalytics = window.ShopifyAnalytics || {};
      window.ShopifyAnalytics.meta = window.ShopifyAnalytics.meta || {};
      window.ShopifyAnalytics.meta.currency = 'USD';
    
        (window.gaDevIds=window.gaDevIds||[]).push('BwiEti');
        
        (function () {
          var customDocumentWrite = function(content) {
            var jquery = null;

            if (window.jQuery) {
              jquery = window.jQuery;
            } else if (window.Checkout && window.Checkout.$) {
              jquery = window.Checkout.$;
            }

            if (jquery) {
              jquery('body').append(content);
            }
          };

          var analytics = document.createElement('script');
          var loaded = false;
          var onload = function() {
            if (loaded) return;
            loaded = true;
            window.ShopifyAnalytics.lib = window.analytics.noConflict();
            window.ShopifyAnalytics.lib.initialize({"Google Analytics":{"trackingId":"UA-33595068-1","domain":"auto","siteSpeedSampleRate":"10","enhancedEcommerce":true,"doubleClick":true,"includeSearch":true}});
            
        window.ShopifyAnalytics.lib.page(
          null,
          {}
        );
      
            

            window.ShopifyAnalytics.lib.ready(function() {
              
      ga('require', 'linker');
      function addListener(element, type, callback) {
        if (element.addEventListener) {
          element.addEventListener(type, callback);
        }
        else if (element.attachEvent) {
          element.attachEvent('on' + type, callback);
        }
      }
      function decorate(event) {
        event = event || window.event;
        var target = event.target || event.srcElement;
        if (target && (target.action || target.href)) {
          ga(function (tracker) {
            var linkerParam = tracker.get('linkerParam');
            document.cookie = '_shopify_ga=' + linkerParam + '; ' + 'path=/';
          });
        }
      }
      addListener(window, 'load', function(){
        for (var i=0; i < document.forms.length; i++) {
          if(document.forms[i].action && document.forms[i].action.indexOf('/cart') >= 0) {
            addListener(document.forms[i], 'submit', decorate);
          }
        }
        for (var i=0; i < document.links.length; i++) {
          if(document.links[i].href && document.links[i].href.indexOf('/checkout') >= 0) {
            addListener(document.links[i], 'click', decorate);
          }
        }
      });
    

              var originalDocumentWrite = document.write;
              document.write = customDocumentWrite;
              try {  } catch(e) {};
              document.write = originalDocumentWrite;
            });
          }
          analytics.onload = onload;
          analytics.onreadystatechange = function() {
            if (!/complete|loaded/.test(analytics.readyState)) return;
            onload();
          }
          analytics.async = true;
          analytics.src = "//cdn.shopify.com/s/assets/vendor/analytics-123fde9c0c8e765baf6cd4171639dda8.js";
          document.getElementsByTagName('head')[0].appendChild(analytics);
          
      var eventsListenerScript = document.createElement('script');
      eventsListenerScript.async = true;
      eventsListenerScript.src = "//cdn.shopify.com/s/assets/shop_events_listener-039aa29e52993d39dcbb917712c30dc7.js";
      document.getElementsByTagName('head')[0].appendChild(eventsListenerScript);
    
        })();