Adding Google Analytics To React

I am trying to add Google Analytics to a React Web Application.

I know how to do it in HTML/CSS/JS sites and I have integrated it in an AngularJS app too. But, I'm not quite sure how to go about it when it comes to react.

With HTML/CSS/JS, I had just added it to every single page.

What I had done with AngularJS was adding GTM and GA script to index.html and added UA-labels to the HTML divs (and buttons) to get clicks.

How can I do that with React?

Please help!

Update: Feb 2019
As I saw that this question is being searched a lot, I decided to expand my explanation.
To add Google Analytics to React, I recommend using React-GA.
Add by running:
npm install react-ga --save

Initialization:
In a root component, initialize by running:

import ReactGA from 'react-ga';
ReactGA.initialize('Your Unique ID');

To report page view:

ReactGA.pageview(window.location.pathname + window.location.search);

To report custom event:

ReactGA.event({
  category: 'User',
  action: 'Sent message'
});

More instructions can be found in the github repo

The best practice for this IMO is using react-ga. Have a look at the github rep