import and init react-ga only for production

src/index.js

@@ -1,7 +1,6 @@
 /* eslint-disable react/jsx-filename-extension */
 import React from 'react';
 import createHistory from 'history/createBrowserHistory';
-import ReactGA from 'react-ga';
 import { hydrate, render } from 'react-dom';
 import { Provider } from 'react-redux';
 import { Route, Router } from 'react-router-dom';
@@ -19,12 +18,17 @@ store.dispatch(getHeroAbilities());
 store.dispatch(getNeutralAbilities());
 store.dispatch(getAbilityIds());
 
-ReactGA.initialize('UA-55757642-1');
-ReactGA.pageview(window.location.pathname + window.location.search);
 const history = createHistory();
-history.listen((location) => {
-  ReactGA.pageview(location.pathname);
-});
+
+if (process.env.NODE_ENV === 'production') {
+  const ReactGA = require('react-ga'); // eslint-disable-line global-require
+  ReactGA.initialize('UA-55757642-1');
+  ReactGA.pageview(window.location.pathname + window.location.search);
+
+  history.listen((location) => {
+    ReactGA.pageview(location.pathname);
+  });
+}
 
 const rootElement = document.getElementById('root');
 const app = (