ReactGA.initialize must be called first

Question

I am getting the following warning multiple times (for multiple pages) despite me initializing at the root of my app. This makes me wonder if google analytics is even working properly? [react-ga] ReactGA.initialize must be called first or GoogleAnalytics should be loaded manually

I am using ReactGA to handle my google analytics tags, and I cannot get it to work. According to the documentation and a handful of other questions about this online, all I need to do is insert this at my application root:

App.js:

import ReactGA from 'react-ga';
ReactGA.initialize('G-xxxxxxxxxx');

const app = () => (
    // Root level components here, like routing and navigation
)

I am using Server Side Rendering, so I am making sure the window object exists before tracking. This line is put at the end of my imports on each of my pages:

example page.js:

import ReactGA from 'react-ga';
if (typeof(window) !== 'undefined') {
    ReactGA.pageview(window.location.pathname + window.location.search);
}

function page() {
    return(<div className="page">Hello, World</div>)
}

export default page;

At this point, there isn't a lot of information on how to set up Google Analytics for SSR applications, so I'm not entirely sure what I need to do to get this working. Any help is appreciated!

Answer 1

I finally found the solution after a lot of tinkering with potential solutions. Since pageview was being fired before initialize could finish, I tired delaying pageview as much as I could by placing it in componentDidMount() . That implementation looks like this:

App.js:

//imports
import ReactGA from 'react-ga';
ReactGA.initialize('UA-xxxxxxxxx-x');

const App = () => (
  <div className="App">
    <Navigation />
            
    <AppRouting />
  </div>
);

Page.js:

import ReactGA from 'react-ga';

class MyPage extends React.Component {
    componentDidMount() {
        ReactGA.pageview(window.location.pathname + window.location.search);
    }

    render() {
        return(
            <Component />
        );
    }
}