if (process.BROWSER_BUILD) {
    (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 = Number(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-89526435-1', 'auto');
    ga('require', 'linkid', {
        cookieName: '_ela',
        duration: 300,
        levels: 10
    });
}

// https://nuxtjs.org/faq/google-analytics/

/*
 ** Only run on client-side and only in production mode
 */
if (process.BROWSER_BUILD && process.env.NODE_ENV === 'production') {
    /*
     ** Include Google Analytics 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');
    /*
     ** Set the current page
     */
    ga('create', 'UA-89526435-1', 'auto')
    ga('send', 'pageview')
    /*
     ** When the app is mounted
     */
    window.onNuxtReady((app) => {
        /*
         ** Every time the route changes
         */
        app.$nuxt.$on('routeChanged', (to, from) => {
            /*
             ** We tell Google Analytic to add a page view
             */
            ga('set', 'page', to.fullPath)
            ga('send', 'pageview')
        })
    })
}
Improve ga