import environment variables from a .env file in React Native, don't need any native code integration.
$ npm install react-native-dotenv --save-dev
react-native-dotenv preset to your .babelrc file at the project root.
RN (0.56+) (Babel 7)
If you haven't got .babelrc set up for React Native, remember to install
$ npm install babel-preset-react-native --save-dev
Add your app configuration in an .env file.
Now you can import it in your .js file.
How does it work?
As you can see, it's implemented as a babel plugin. All referenced imported members are replaced as the values specified in the .env file.
The example above will get compiled as below.
Changes to .env file is not updated
Manually edit the file importing
react-native-dotenv by either adding an empty line or whitespace will work.
Can I use different .env settings for production ?
Yes, simply create a separate .env.production file and the default release process of react-native will pickup the right config.
You can use the Release configuration to launch the Simulator. (Only supported in RN v0.39+)
react-native run-ios --configuration Release
Mto launch the developer menu in Android emulator.
- Tap DevSettings.
- Toggle JS Dev Mode.
Can I have more than
development environment configs?
Sadly, it's not available so far. One of the workaround is generating .env file before triggering RN's bundle script automatically using either shell script or your own custom build pipeline.
MIT License, see LICENSE file for detail.