move GA initialization to own file (#2508)

src/components/analytics/index.ts

+import ReactGA from 'react-ga'
+import { isMobile } from 'utils/userAgent'
+
+const GOOGLE_ANALYTICS_ID: string | undefined = process.env.REACT_APP_GOOGLE_ANALYTICS_ID
+if (typeof GOOGLE_ANALYTICS_ID === 'string') {
+  ReactGA.initialize(GOOGLE_ANALYTICS_ID, {
+    gaOptions: {
+      storage: 'none',
+      storeGac: false,
+    },
+  })
+  ReactGA.set({
+    anonymizeIp: true,
+    customBrowserType: !isMobile
+      ? 'desktop'
+      : 'web3' in window || 'ethereum' in window
+      ? 'mobileWeb3'
+      : 'mobileRegular',
+  })
+} else {
+  ReactGA.initialize('test', { testMode: true, debug: true })
+}

src/index.tsx

-import 'inter-ui'
 import '@reach/dialog/styles.css'
+import 'inter-ui'
 import 'polyfills'
+import 'components/analytics'
 
 import { createWeb3ReactRoot, Web3ReactProvider } from '@web3-react/core'
 import { StrictMode } from 'react'
 import ReactDOM from 'react-dom'
-import ReactGA from 'react-ga'
 import { Provider } from 'react-redux'
 import { HashRouter } from 'react-router-dom'
 
@@ -24,7 +24,6 @@ import UserUpdater from './state/user/updater'
 import ThemeProvider, { ThemedGlobalStyle } from './theme'
 import RadialGradientByChainUpdater from './theme/RadialGradientByChainUpdater'
 import getLibrary from './utils/getLibrary'
-import { isMobile } from './utils/userAgent'
 
 const Web3ProviderNetwork = createWeb3ReactRoot(NetworkContextName)
 
@@ -32,26 +31,6 @@ if (!!window.ethereum) {
   window.ethereum.autoRefreshOnNetworkChange = false
 }
 
-const GOOGLE_ANALYTICS_ID: string | undefined = process.env.REACT_APP_GOOGLE_ANALYTICS_ID
-if (typeof GOOGLE_ANALYTICS_ID === 'string') {
-  ReactGA.initialize(GOOGLE_ANALYTICS_ID, {
-    gaOptions: {
-      storage: 'none',
-      storeGac: false,
-    },
-  })
-  ReactGA.set({
-    anonymizeIp: true,
-    customBrowserType: !isMobile
-      ? 'desktop'
-      : 'web3' in window || 'ethereum' in window
-      ? 'mobileWeb3'
-      : 'mobileRegular',
-  })
-} else {
-  ReactGA.initialize('test', { testMode: true, debug: true })
-}
-
 function Updaters() {
   return (
     <>