Run after npm install and you can use node core modules and npm modules that use them in your React Native app.

rn-nodeify <options>

--install     install node core shims (default: install all), fix the "browser" 
              (later "react-native") fields in the package.json's of dependencies
--hack        hack individual packages that are known to make the React Native packager choke

# install all shims and run package-specific hacks
rn-nodeify --install --hack

# install specific shims
rn-nodeify --install "fs,dgram,process,path,console"

# install specific shims and hack
rn-nodeify --install "fs,dgram,process,path,console" --hack

It is recommended to add this command to the "postinstall" script in your project's package.json

"scripts": {
  "start": "node node_modules/react-native/local-cli/cli.js start",
  "postinstall": "rn-nodeify --install fs,dgram,process,path,console --hack"
}

• rn-nodeify won't work with modules that are added using npm link.
• modules that contain a .babelrc will cause problems with the latest react-native version (0.20 at this time), remove them after installation (rm node_modules/*/.babelrc)
• when installing a package from git, the postinstall hook isn't triggered, run it manually instead (npm run postinstall)
• restart the react-native packager after installing a module!
• removing the packager cache helps as well sometimes (rm -fr $TMPDIR/react-*)

Also, see this example React Native app