wesleytodd / setprototypeof

Polyfill for Object.setPrototypeOf

Polyfill for Object.setPrototypeOf

A simple cross platform implementation to set the prototype of an instantiated object. Supports all modern browsers and at least back to IE8.

Usage:

$ npm install --save setprototypeof

var setPrototypeOf = require('setprototypeof')

var obj = {}
setPrototypeOf(obj, {
  foo: function () {
    return 'bar'
  }
})
obj.foo() // bar

TypeScript is also supported:

import setPrototypeOf from 'setprototypeof'

setprototypeof's Issues

IE9/10 and inheritance

Hi @wesleytodd, thanks for the package! It looks simple and very well-used.

By my testing, this does not behave correctly on IE9/10 - is that correct? What I mean is the problem described here, where changes to the parent prototype aren't reflected in the child:

var foo = { a: 1 };
var bar = { b: 2 };
setPrototypeOf(bar, foo);
bar.a; // 1
foo.a = 2;
bar.a; // 1 - should be 2

IE9/10 do not have setPrototypeOf or __proto__, which means that they will default to the mixinProperties definition. Looks like that just copies the properties with no link. My testing confirms that bar.a returns 1 instead of 2 at the end, using setPrototypeOf() in IE9/10.

Is this deliberate? I believe I could fix the behaviour, let me know and I'll submit a PR.

Edit: Changed the example to use the setPrototypeOf() syntax.

module undefined

Hi,

I get module is undefined error in ie10 when i include this polyfill. How do i fix it?

Thanks