Object.setPrototypeOfA simple cross platform implementation to set the prototype of an instianted object. Supports all modern browsers and at least back to IE8.
$ npm install --save setprototypeof
var setPrototypeOf = require('setprototypeof');
var obj = {};
setPrototypeOf(obj, {
	foo: function() {
		return 'bar';
	}
});
obj.foo(); // bar
TypeScript is also supported:typescript import setPrototypeOf = require('setprototypeof');