Set automatically

Question

21

React-native : detect dev or production env

rated 0 times [ 22] [ 1] / answers: 1 / hits: 29295 / 9 Years ago, wed, december 16, 2015, 12:00:00

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

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morganm

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3 Years ago

answered 9 Years ago nestorjarettg · Accepted Answer

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');

}