rict</code> config flag, this
field is advisory only will produce warnings when your package is installed as a dependency.</p>
<h2 id="enginestrict">engineStrict</h2>
<p><strong>This feature was removed in npm 3.0.0</strong></p>
<p>Prior to npm 3.0.0, this feature was used to treat this package as if the
user had set <code>engine-strict</code>. It is no longer used.</p>
<h2 id="os">os</h2>
<p>You can specify which operating systems your
module will run on:</p>
<pre><code>&quot;os&quot; : [ &quot;darwin&quot