Requiring unknown module "crypto" in react-native environment

Question

I'm writing a simple Twitter app using react-native. Using twit module to get twitter feeds and stream. Below is the code, it works fine node. However, when included into my react-native app, seeing error "Requiring unknown module "crypto"". Dependency seems to be myapp->twit->oauth->crypto (thats part of node v0.12.2). Any suggestions to get this working inside react-native environment?

var Twit = require('twit')
var T = new Twit({
    consumer_key:''
  , consumer_secret:''
  , access_token:''
  , access_token_secret:''
})
var filtered_tweets=[];
var error;
var isSuccess=false;

function getTweets(searchString){
    T.get('search/tweets',{q:searchString, count:100}, getResponse);
    }

function getResponse(err,data,response){
        if(err) { 
            handleGetErr(err); 
        }
        handleGetData(data.statuses);
    }

function handleGetErr(err){

    enter code here

    error = err;
    }

function handleGetData(data){
    data.map(function(tweet){
      var twit={
        twit:tweet.id,
        created_at:tweet.created_at,
        text:tweet.text,
        retweet_count:tweet.retweet_count,
        favorite_count:tweet.favorite_count
      };
      filtered_tweets.push(twit);
    });
    console.log(filtered_tweets);
    isSuccess=true;
}
getTweets("@sahaswaranamam");
module.exports = getTweets;

![attached][2]

Answer 1

The crypto module is a built-in Node module; React Native runs JS on JavaScriptCore (when on the device or simulator) and on Chrome itself (when using Chrome debugging), so modules that depend on built-in Node.js modules won't work. See the JavaScript Runtime section of the React Native docs for more info.

I'm not sure how hard it would be to integrate into a React Native app, but browser module bundlers like Browserify often have browser versions of core Node.js modules, like this one for crypto.