They are extremely different.<p>I made a quick comparison here: <a href="https:&#x2F;&#x2F;gist.github.com&#x2F;alexanderGugel&#x2F;a10ed5655d366875a280" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;alexanderGugel&#x2F;a10ed5655d366875a280</a><p>Basically ied uses symlinks in order to resolve circular dependencies, while ied exploits the fact that require &quot;falls back&quot; in the directory structure.