main.jsbundle, Foundation and Security missing in the project, causing error

The problem can be resolved as follows

• By using the react native command line
• $ react-native bundle --entry-file ./index.ios.js --platform ios --bundle-output ios/main.jsbundle using this in the root of the react native project
• When the main.jsbundle file is generated add it back to the Add Files to Project option
• Just verify that the file is included in the build phase and re-build

UpdateFor the asset destination to be set they have to be in same folder.

Try this,it would create the asset folder

$ react-native bundle --entry-file ./index.ios.js --platform ios --bundle-output ios/main.jsbundle --assets-dest ./ios

If you're ejecting from create-react-native-app on react-native v0.50+ the index.ios.js and index.android.js files are now combined into index.js

Before or after ejecting run

npm i -g react-native-cli if you npm install

or

yarn global add react-native-cli if you yarn install

...After Ejecting...

[bad advice]run react-native bundle --entry-file ./index.js --platform ios --bundle-output ios/main.jsbundle . <-- Do Not do this.

[UPDATE] The main.jsbundle is created when xcode opens the terminal bundler. make sure you don't close the terminal window and it will run fine.

i am using react-native version- 0.47.1in my case after running the command suggested by @pritishvaidya solved the main.js bundle issue, but even in release build i could see the yellow warning boxes.So i modified the command by adding --dev false. That did the trick.Leaving this updated command here in case, someone is stuck like me.

react-native bundle --entry-file ./index.ios.js --platform ios --dev false --bundle-output ios/main.jsbundle --assets-dest ./ios