<h1>Details</h1>
<p><strong>Disabled by default</strong></p><p>Enforces that functions, mixins, and variables that follow the private naming
convention (default to underscore-prefixed, e.g. <code>$_foo</code>) are defined and used
within the same file.</p><p><strong>Bad</strong></p><div class="highlight highlight-source-scss"><pre><span class="pl-smi">$_foo</span>: <span class="pl-c1">#f00</span>;<br/><br/><span class="pl-ent">p</span> {<br/>  <span class="pl-c1"><span class="pl-c1">color</span></span>: <s