angualr2 and google analytics ga()

  1. index.html < inluce google code like in default application
<body>
<script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
            (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

    ga('create', 'UA-xx-1', 'auto');

</script>

2. app.component.ts

in import section

declare let ga: Function;
ngOnInit() {
    this.router.events.subscribe((evt) => {
        if (!(evt instanceof NavigationEnd)) {
            return;
        }
        ga('set', 'page', evt.urlAfterRedirects);
        ga('send', 'pageview');        
    });
}