debuggerWorker.js

// file location:
// node_modules/react-native/local-cli/server/util/debuggerWorker.js
var messageHandlers = {
  'executeApplicationScript': function(message, sendReply) {
    for (var key in message.inject) {
      self[key] = JSON.parse(message.inject[key]);
    }
    importScripts(message.url);
    sendReply();
  }
};

onmessage = function(message) {
  var object = message.data;

  var sendReply = function(result) {
    postMessage({replyID: object.id, result: result});
  };

  var handler = messageHandlers[object.method];
  if (handler) {
    // Special cased handlers
    handler(object, sendReply);
  } else {
    // Other methods get called on the bridge
    var returnValue = [[], [], [], [], []];
    try {
      if (typeof __fbBatchedBridge === 'object') {
        returnValue = __fbBatchedBridge[object.method].apply(null, object.arguments);
      }
    } finally {
      sendReply(JSON.stringify(returnValue));
    }
  }
};