Object.observe is dead. Long live Mobservable.observe

observe.js

// JSBin: http://jsbin.com/kekoli/edit?js,console
import {observable, observe} from "mobx";

const person = observable({
	firstName: "Maarten",
	lastName: "Luther"
});

const disposer = observe(person, (change) => {
	console.log(`${change.type} '${change.name}' from '${change.oldValue}' to '${change.object[change.name]}'`);
});

person.firstName =  "Martin";
// Prints: 'update 'firstName' from 'Maarten' to 'Martin'

disposer();
// Ignore any future updates