NativeEventDispatcher.js

import React from 'react'
import { DeviceEventEmitter, NativeModules } from 'react-native'

const addListener = (event, callback) => {
  DeviceEventEmitter.addListener(event, ({key, data}) => {
    // `key` is the numeric key assigned by the native dispatcher,
    // `data` contains the data that the native call actually wanted to pass
    NativeModules.ReactResultRouter.routeResults({
      key,
      data: callback(data)
    })
  })
}

export default class NativeEventDispatcher extends React.Component {

  componentDidMount() {
    addListener('DoSomething', ({prop1, prop2}) => {
      // prop1 and prop2 are params passed in from native code
      return doSomething(prop1, prop2)
    })
  }

  render() {
    return null
  }
}