Which browsers support Object.observe?

Question

Which browsers, if any, support Object.observe? I'm surprised I'm unable to find any info on this.

(And are you aware about any estimated times of arrival for this feature?)

About Object.observe: "Object.observe allows for the direct observation of changes to ECMAScript objects. It allows an observer to receive a time-ordered sequence of change records which describe the set of changes which took place to the set of observed objects." — see ecmascript.org, the Solution section.)

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Edit November 2015: Apparently Object.observe has been cancelled:

http://www.infoq.com/news/2015/11/object-observe-withdrawn

https://esdiscuss.org/topic/an-update-on-object-observe
"I plan to withdraw the Object.observe proposal from TC39"

https://esdiscuss.org/topic/save-object-observe-please-make-weakmap-weakset-observable
"Save Object.observe()! (please)"

Answer 1

No browsers. If its not true today, it will be true someday, and then this can be the accepted answer.

Answer 2

You can use kangax's Browser Compatibility Table for Object.observe

It is part of ECMA Script 7 Specifications, it seems. Luckily, at the time of this writing, my current browser, Chrome 33, is the only one which supports it :)

If you like to enable it in Chrome 33,

1. Visit chrome://flags/

2. And enable Enable Experimental JavaScript

Answer 3

Chrome 35+ supports Object.observe() Method.

More details here: html5rocks

Update: It's moved to chrome 36 beta.

Answer 4

It used to be present in both Chrome & Opera, but the feature has been removed from both browsers after the standards committee withdrew the proposal for this feature!

Answer 5

Disclaimer: I'm the author of object-observer library.

basarat's answer is definitelly the right one - nowadays no browser supports it.

Most of the polyfills performing 'dirty-checks' - not the best way to achieve observance IMHO.

Better way is to pick up one of the several libraries providing the same functionality utilizing native Proxy capabilities, object-observer being just one of them.

Answer 6

Chrome 36+, Opera 30+. My favorite way of answering these questions is http://caniuse.com. It's clear, consice, and has instant search.

Answer 7

Polymer is a new and promising framework that intends to implement Web Components, for which Object.observe() is an integral part.

It provides polyfill implementation for "evergreen" browsers; the latest ones available. Moreover, they track what browser have native support for this feature, so it speeds up their implementation.

This polyfill is available as a separate library on GitHub.