feat: Check for update on startup

App.js

@@ -1,4 +1,4 @@
-import { AppLoading } from 'expo'
+import { AppLoading, Updates } from 'expo'
 import * as Font from 'expo-font'
 import React from 'react'
 import { Platform, StatusBar, StyleSheet, Text, View } from 'react-native'
@@ -12,6 +12,8 @@ import PushNotifications from './src/PushNotifications'
 import navigationService from './src/NavigationService'
 import NotificationsHandler from './src/NotificationsHandler'
 import { logger } from './src/Logger'
+import { alertAsync } from './src/AsyncAlert'
+import { getEnvVars } from './constants/Env'
 
 /**
  * Set default Text style
@@ -31,6 +33,10 @@ class App extends React.Component {
     isLoadingComplete: false
   }
 
+  componentDidMount = () => {
+    this._checkUpdate()
+  }
+
   render () {
     if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
       return (
@@ -63,6 +69,29 @@ class App extends React.Component {
     }
   }
 
+  async _checkUpdate () {
+    if (getEnvVars().dev === true) {
+      return
+    }
+    try {
+      let update = await Updates.checkForUpdateAsync()
+      if (update.isAvailable) {
+        let confirmDownload = await alertAsync('Update available', 'Download now?')
+        if (!confirmDownload) {
+          return
+        }
+        await Updates.fetchUpdateAsync()
+
+        let confirmReload = await alertAsync('Update downloaded', 'Reload app now?')
+        if (confirmReload) {
+          Updates.reloadFromCache()
+        }
+      }
+    } catch (e) {
+      logger.error('Update failed!', e)
+    }
+  }
+
   async _notificationsSubscribe () {
     /**
      * When the app is started from a notification,