code>foo -&gt; bar -&gt; baz -&gt; bar -&gt; baz ...</code>.  However, since the folder
structure is: <code>foo/node_modules/bar/node_modules/baz</code>, there&#39;s no need to
put another copy of bar into <code>.../baz/node_modules</code>, since when it calls
require(&quot;bar&quot;), it will get the copy that is installed in
<code>foo/node_modules/bar</code>.</p>
<p>This shortcut is only used if the exact same
version would be installed in multiple nested <code>node_modules</code> folders.  It
is still po