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declare module 'emitter20' {

    function Emitter(): Emitter.IEmitter;
    namespace Emitter {
        interface IEmitter {
            on: (eventName: string, cb: (data?: any) => void) => void;
            trigger: (eventName: string, data?: any) => void;
        }
    }


    export = Emitter;
}

module.exports = function() {
  var subscribers = []
  return {
    on: function (eventName, cb) {
      subscribers.push({
        eventName: eventName,
        cb: cb
      })
    },
    trigger: function (eventName, data) {
      subscribers
        .filter(function (subscriber) {
          return subscriber.eventName === eventName
        })
        .forEach(function (subscriber) {
          subscriber.cb(data)
        })
    }
  }
}

import * as emitter from 'emitter20';

var emitterInstance : emitter.IEmitter = emitter();
emitterInstance.on("event", (data : any) => {
    console.log(data.foo);
})

emitterInstance.trigger("event", {"foo": "bar"});

{
  "devDependencies": {
    "typescript": "^1.8.10"
  }
}