reactjs - React Native - __DEV__ is not defined

Question

I have a react-native@0.26.2 project. I have deleted the node_modules folder and after i have given the following commands:

npm i
react-native upgrade

but I get this error:

react-native.js:15 

ReferenceError: __DEV__ is not defined

How do I fix?

Answer 1

Adding

/* global __DEV__ */

To the top of the file worked for me.