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Breaking news: ES7 Object.observe is going away

Updated: at 07:00 PM

An update on Object.observe

From Adam K on the ES-Discuss Mailing List:

Over three years ago, Rafael Weinstein, Erik Arvidsson, and I set out to design and implement what we believed to be the primitive underlying the data-binding system of MDV (“model-driven views”). We prototyped an implementation in a branch of V8, then got agreement from the V8 team to build a real version upstream, while pushing Object.observe (“O.o”) as a part of the upcoming ES7 standard and working with the Polymer team to build their data-binding system on top of O.o.

Three years later, the world has changed in a variety of ways. While other data-binding frameworks (such as Ember and Angular) showed interest, it was difficult to see how they could evolve their existing model to match that of O.o. Polymer rewrote from the ground up for its 1.0 release, and in that rebuilding did not utilize O.o. And React’s processing model, which tries to avoid the mutable state inherent in data-binding systems, has become quite popular on the web.

After much discussion with the parties involved, I plan to withdraw the Object.observe proposal from TC39 (where it currently sits at stage 2 in the ES spec process), and hope to remove support from V8 by the end of the year (the feature is used on 0.0169% of Chrome pageviews, according to For developers who have been experimenting with O.o and are seeking a transition path, consider using a polyfill such as or a wrapper library like