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    <p>Combining Raynos's concerns about encapsulation with the OP's clarification that he wants to expose a couple of methods on a messaging service, this is I think the right way to go about it:</p> <pre><code>// In messagingServiceSingleton.js define(function () { var messagingService = new MessagingService(); return { notify: messagingService.listen.bind(messagingService), listen: messagingService.notify.bind(messagingService) }; }); // In bar.js define(["./messagingServiceSingleton"], function (messagingServiceSingleton) { messagingServiceSingleton.listen(/* whatever */); } // In baz.js define(["./messagingServiceSingleton"], function (messagingServiceSingleton) { messagingServiceSingleton.notify(/* whatever */); } </code></pre> <p><code>Function.prototype.bind</code> will not be present in all browsers, so you would need to include a polyfill like <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind" rel="noreferrer">the one Mozilla provides</a>.</p> <p>An alternate (and in my opinion probably better) approach would be to make the messaging service object itself a module. This would look something like</p> <pre><code>// In messagingService.js define(function () { var listenerMap = {}; function listen(/* params */) { // Modify listenerMap as appropriate according to params. } function notify(/* params */) { // Use listenerMap as appropriate according to params. } return { notify: notify listen: listen }; }); </code></pre> <p>Since you expose the same <code>notify</code> and <code>listen</code> methods to everyone who uses your module, and those always refer to the same <a href="http://javascript.crockford.com/private.html" rel="noreferrer">private</a> <code>listenerMap</code> variable, this should do what you want. It also obviates the need for <code>Function.prototype.bind</code>, and gets rid of the rather-unnecessary distinction between the messaging service itself and the module which enforces singleton usage of it.</p>
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    1. COAny reason to prefer `obj.f.bind(obj)` vs `function() { obj.f(); }`. Also an abstraction like {`_.bindAll(obj)`](http://documentcloud.github.com/underscore/#bindAll) is great for these cases.
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    2. CO@Raynos: no great reason, except that if you are using a native version of it then the intermediate function won't show up in the stack trace while debugging. And I guess it will probably be slightly faster, but of course that's just micro-optimization.
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