A shim for the Object.observe Harmony Proposal (see : http://wiki.ecmascript.org/doku.php?id=harmony:observe).
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Latest commit 75e8ea8 Nov 18, 2014 @fdecampredon fdecampredon bump version


Object.observe shim

See : The harmony proposal page.


This shim provides an implementation of the algorithms described in the harmony proposal, and is intended to work on all ES5-compliant browsers.

Dependencies :

While this implementation does not have dependencies, it tries to use "setImmediate" if present, and fall back on setTimeout if it is not, it is recommended to use a setImmediate shim for browsers that do not support it natively. ( A good one can be found here )

Limitations :

While this shim provides an implementation for the Object methods, and the Notifier prototype described in the proposal, it does not try to catch and notify by any means changes made to an object. Instead it let you call manually the notify method :

Object.getNotifier(myObject).notify({ type : "updated" , ....});

ObserveUtils :

The 'observe-utils.js' utilities that facilitate the use of this shim can be found on his own repository

Example :

var myObject = {};
ObserveUtils.defineObservableProperties(myObject, "foo", "bar");
Object.observe(myObject, function (changes) {
myObject.foo = "Hello";
myObject.bar = "World";


        name : "foo",
        object : myObject,
        oldValue : undefined,
        type : "updated"
        name : "bar",
        object : myObject,
        oldValue : undefined,
        type : "updated"

Build And Test:

Require bower and grunt-cli installed on your machine.

npm install & bower install
grunt // test and build
grunt test // test only