[Wallet] Fix persisted data loss on iOS

packages/mobile/index.js

@@ -1,5 +1,7 @@
+// Order is important, please don't change it unless you know what you're doing :D
 import 'node-libs-react-native/globals'
 import 'src/missingGlobals'
+import 'src/forceCommunityAsyncStorage'
 import { AppRegistry } from 'react-native'
 import Logger from 'src/utils/Logger'
 import App from 'src/app/App'

packages/mobile/src/apollo/index.ts

@@ -1,7 +1,7 @@
+import AsyncStorage from '@react-native-community/async-storage'
 import ApolloClient from 'apollo-boost'
 import { InMemoryCache, IntrospectionFragmentMatcher } from 'apollo-cache-inmemory'
 import { persistCache } from 'apollo-cache-persist'
-import { AsyncStorage } from 'react-native'
 import introspectionQueryResultData from 'src/apollo/fragmentTypes.json'
 import config from 'src/geth/networkConfig'
 import Logger from 'src/utils/Logger'

packages/mobile/src/forceCommunityAsyncStorage.ts

@@ -0,0 +1,15 @@
+import AsyncStorage from '@react-native-community/async-storage'
+import ReactNative from 'react-native'
+
+// Monkey patch React Native so it uses the community implementation of AsyncStorage.
+// This is to fix the problem of loosing AsyncStorage data on iOS when some modules
+// import AsyncStorage from React Native Core and some others import from React Native Community.
+// Since both implementations currently write to the same file on disk, the last one to write wins
+// and erases the existing data written by the other.
+// See https://github.com/react-native-community/async-storage/issues/118#issuecomment-500138053
+// TODO: remove this once React Native removes AsyncStorage from Core.
+Object.defineProperty(ReactNative, 'AsyncStorage', {
+  get() {
+    return AsyncStorage
+  },
+})