Polyfilling Object.observe

T.J. Crowder tj.crowder at farsightsoftware.com
Tue Jul 24 17:17:02 UTC 2018

On Tue, Jul 24, 2018 at 6:01 PM, /#!/JoePea
<joe at trusktr.io> wrote:
> Is there a way to polyfill `Object.observe` in such a way that the object
> before observation is the same reference as the object being observed
> the call (i.e. not a Proxy), and other than monkey-patching
> Is defining getters/setters the only way?

Even that doesn't really polyfill it, because `Object.observe` got
notifications of changes when new properties were created as well.

But yes, **if** you know the names of the properties in advance (the
"shape" of the object, I believe, is the current parlance?), and if you
want notifications of changes just to those properties, I think
monkeypatching will be your simplest and most successful approach.

If you need to catch additions as well, I don't think there's any solution
other than diffing, which is quite yucky.

-- T.J. Crowder
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