$ npm install react-native-gunzip --save

$ react-native link react-native-gunzip

1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
2. Go to node_modules ➜ react-native-gunzip and add RNGunzip.xcodeproj
3. In XCode, in the project navigator, select your project. Add libRNGunzip.a to your project's Build Phases ➜ Link Binary With Libraries
4. Run your project (Cmd+R)<

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.reactlibrary.RNGunzipPackage; to the imports at the top of the file
• Add new RNGunzipPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-gunzip'
   project(':react-native-gunzip').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-gunzip/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-gunzip')
   

import RNGunzip from 'react-native-gunzip'

//won't overwrite destination (results in error):
RNGunzip.gunzip(sourceFilePath, destinationFilePath)

//overwrites the destination file if exists:
RNGunzip.gunzip(sourceFilePath, destinationFilePath, true)