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    <p>Synchronous loading of modules in the browser is problematic. A construct like:</p> <pre><code>var x = require('something_remote.js') </code></pre> <p>Implies that the browser will halt your code (i.e. block), go and fetch the remote file, parse it, and then return to you the exports. But this does not jive with the single-threaded browser environment - we would be halting the main JavaScript thread (and thus page interactivity for the user) on the performance of the network. So browsers have evolved against this scenario, to favor async loading on their own schedule. There is some good discussion here:</p> <p><a href="http://www.sitepen.com/blog/2010/07/16/asynchronous-commonjs-modules-for-the-browser-and-introducing-transporter/" rel="nofollow">http://www.sitepen.com/blog/2010/07/16/asynchronous-commonjs-modules-for-the-browser-and-introducing-transporter/</a></p> <p>One pattern which might work here is that a require() implementation does synchronously block, fetches the file via XHR and then evals it, but that seems to run against all the browser support/infrastructure for async file-based loading. Also I'm curious what implications that would have for the cross-domain primitive of browser security.</p> <p>So in order to fit the browser async loading model, we'll need to use a callback mechanism like:</p> <pre><code>require("something.js", function () { // called later, after something.js has loaded! }) </code></pre> <p>It looks like RequireJS is doing this:</p> <p><a href="http://requirejs.org/docs/start.html" rel="nofollow">http://requirejs.org/docs/start.html</a></p> <p>Perhaps give that a shot?</p> <p>JavaScript environments like NodeJS etc - built with the provision of loading "local" modules from disk, instead of foreign network hosts - can do the synchronous load.</p> <p>I would greatly appreciate any corrections from JS experts :-)</p>
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    1. POGetting started with Yabble--browser-side CommonJS module loading
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    1. USMike Repass
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    1. COThanks for the helpful info! I was actually looking for more specific information about Yabble, so I can't really mark this as the answer, but I did figure it out myself eventually.
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      1. USChris W.
    2. COfor the record: yabble only does sync ajax to require() in development mode. if you bundle everything into one file (with yabbler) it already has all the modules and a sync `require()` is fine.
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