fixes https://github.com/Uniswap/uniswap-interface/issues/1214

src/index.tsx

@@ -21,8 +21,8 @@ import getLibrary from './utils/getLibrary'
 
 const Web3ProviderNetwork = createWeb3ReactRoot(NetworkContextName)
 
-if ('ethereum' in window) {
-  ;(window.ethereum as any).autoRefreshOnNetworkChange = false
+if (!!window.ethereum) {
+  window.ethereum.autoRefreshOnNetworkChange = false
 }
 
 const GOOGLE_ANALYTICS_ID: string | undefined = process.env.REACT_APP_GOOGLE_ANALYTICS_ID

src/react-app-env.d.ts

@@ -11,6 +11,7 @@ interface Window {
     isMetaMask?: true
     on?: (...args: any[]) => void
     removeListener?: (...args: any[]) => void
+    autoRefreshOnNetworkChange?: boolean
   }
   web3?: {}
 }