Add expo-updates to an existing project

+ import 'expo-asset';
import { registerRootComponent } from 'expo';

import App from './App';

// registerRootComponent calls AppRegistry.registerComponent('main', () => App);
// It also ensures that whether you load the app in Expo Go or in a native build,
// the environment is set up appropriately
registerRootComponent(App);

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>EXUpdatesCheckOnLaunch</key>
    <string>ALWAYS</string>
    <key>EXUpdatesEnabled</key>
    <true/>
    <key>EXUpdatesLaunchWaitMs</key>
    <integer>0</integer>
    <key>EXUpdatesSDKVersion</key>
    <string>46.0.0</string>
    <key>EXUpdatesURL</key>
    <string>https://exp.host/@my-expo-username/my-app</string>
  </dict>
</plist>

+ <meta-data android:name="expo.modules.updates.EXPO_UPDATE_URL" android:value="https://exp.host/@my-expo-username/my-app" />
+ <meta-data android:name="expo.modules.updates.EXPO_SDK_VERSION" android:value="46.0.0" />
+ <meta-data android:name="expo.modules.updates.UPDATES_CONFIGURATION_REQUEST_HEADERS_KEY" android:value="{'expo-channel-name':'your-channel-name'}"/>
+ <meta-data android:name="expo.modules.updates.EXPO_UPDATES_ENABLED" android:value="true" />
+ <meta-data android:name="expo.modules.updates.EXPO_UPDATES_LAUNCH_WAIT_MS" android:value="0" />
+ <meta-data android:name="expo.modules.updates.EXPO_UPDATES_CHECK_ON_LAUNCH" android:value="ALWAYS" />

#import <Foundation/Foundation.h>
+ #import <EXUpdates/EXUpdatesAppController.h>
#import <React/RCTBridgeDelegate.h>
#import <UIKit/UIKit.h>

#import <ExpoModulesCore/EXAppDelegateWrapper.h>

- @interface AppDelegate : EXAppDelegateWrapper <RCTBridgeDelegate>
+ @interface AppDelegate : EXAppDelegateWrapper <RCTBridgeDelegate, EXUpdatesAppControllerDelegate>

+ @interface AppDelegate () <RCTBridgeDelegate>
+
+ @property (nonatomic, strong) NSDictionary *launchOptions;
+
+ @end
+
 @implementation AppDelegate

-  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
+  self.launchOptions = launchOptions;
+  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+  #ifdef DEBUG
+    [self initializeReactNativeApp];
+  #else
+    EXUpdatesAppController *controller = [EXUpdatesAppController sharedInstance];
+    controller.delegate = self;
+    [controller startAndShowLaunchScreen:self.window];
+  #endif
+
+  [super application:application didFinishLaunchingWithOptions:launchOptions];
+
+  return YES;
+ }
+
+ - (RCTBridge *)initializeReactNativeApp
+ {
+  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:self.launchOptions];
   RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:@"main" initialProperties:nil];
   id rootViewBackgroundColor = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"RCTRootViewBackgroundColor"];
   if (rootViewBackgroundColor != nil) {

     rootView.backgroundColor = [UIColor whiteColor];
   }

-  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
   UIViewController *rootViewController = [UIViewController new];
   rootViewController.view = rootView;
   self.window.rootViewController = rootViewController;
   [self.window makeKeyAndVisible];

-  [super application:application didFinishLaunchingWithOptions:launchOptions];
-
-  return YES;
+  return bridge;
  }

 - (NSArray<id<RCTBridgeModule>> *)extraModulesForBridge:(RCTBridge *)bridge

  #ifdef DEBUG
   return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
  #else
-  return [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
+  return [[EXUpdatesAppController sharedInstance] launchAssetUrl];
  #endif
 }

+ - (void)appController:(EXUpdatesAppController *)appController didStartWithSuccess:(BOOL)success {
+  appController.bridge = [self initializeReactNativeApp];
+ }

 // Linking API
 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
   return [RCTLinkingManager application:application openURL:url options:options];

     <key>EXUpdatesURL</key>
     <string>https://exp.host/@my-expo-username/my-app</string>
+    <key>EXUpdatesAutoSetup</key>
+    <false/>
   </dict>
 </plist>

   <application android:name=".MainApplication" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round" android:allowBackup="false" android:theme="@style/AppTheme" android:usesCleartextTraffic="true">
     <meta-data android:name="expo.modules.updates.EXPO_UPDATE_URL" android:value="https://exp.host/@my-expo-username/my-app"/>
     <meta-data android:name="expo.modules.updates.EXPO_SDK_VERSION" android:value="46.0.0"/>
+    <meta-data android:name="expo.modules.updates.AUTO_SETUP" android:value="false"/>
     <activity android:name=".MainActivity" android:label="@string/app_name" android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode" android:launchMode="singleTask" android:windowSoftInputMode="adjustResize" android:theme="@style/Theme.App.SplashScreen">
       <intent-filter>
         <action android:name="android.intent.action.MAIN"/>

 import android.app.Application;
 import android.content.Context;
 import android.content.res.Configuration;
+ import android.net.Uri;

 import com.facebook.react.PackageList;
 import com.facebook.react.ReactApplication;

 import expo.modules.ApplicationLifecycleDispatcher;
 import expo.modules.ReactNativeHostWrapper;
+ import expo.modules.updates.UpdatesController;

 import com.facebook.react.bridge.JSIModulePackage;
 import com.swmansion.reanimated.ReanimatedJSIModulePackage;

 import java.lang.reflect.InvocationTargetException;
 import java.util.Arrays;
 import java.util.List;
+ import javax.annotation.Nullable;

 public class MainApplication extends Application implements ReactApplication {
   private final ReactNativeHost mReactNativeHost = new ReactNativeHostWrapper(

     protected JSIModulePackage getJSIModulePackage() {
       return new ReanimatedJSIModulePackage();
     }
+
+    @Override
+    protected @Nullable String getJSBundleFile() {
+      if (BuildConfig.DEBUG) {
+        return super.getJSBundleFile();
+      } else {
+        return UpdatesController.getInstance().getLaunchAssetFile();
+      }
+    }
+
+    @Override
+    protected @Nullable String getBundleAssetName() {
+      if (BuildConfig.DEBUG) {
+        return super.getBundleAssetName();
+      } else {
+        return UpdatesController.getInstance().getBundleAssetName();
+      }
+    }
   });

     super.onCreate();
     SoLoader.init(this, /* native exopackage */ false);

+    if (!BuildConfig.DEBUG) {
+      UpdatesController.initialize(this);
+    }
+
     initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
     ApplicationLifecycleDispatcher.onApplicationCreate(this);
   }