React-native : detect dev or production env
I develop a react-native app where some API calls should be made.
If I'm in production mode my app should call, for example, this host :
https://example.com/
but if I'm in dev mode, it should call my local host machine on a different port, for example :
http://192.168.0.10:8080/
How the react-native code can be aware of its environment ?
.dotenv
seems to not work with react-native.
In the Chrome debug, we can see that the application is launched with some params :
Running application "AppName" with appParams: {"initialProps":{},"rootTag":1}. __DEV__ === true, development-level warning are ON, performance optimizations are OFF
Can we get this __DEV__
value in the application ?
Thanks
Solution 1:
Set automatically
The constant __DEV__
is set automatically.
Production
Building the bundle via --dev=false
should unset __DEV__
.
Usage
if (__DEV__) {
console.log('Development');
} else {
console.log('Production');
}