<p dir="auto">If you use one single or double quote without closing it, syntax highlighting breaks (even with ES6 enabled as the target). Heres' an example:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/6439050/11258829/bc70aaf6-8e2a-11e5-9a85-14a30811eb61.png"><img src="https://cloud.githubusercontent.com/assets/6439050/11258829/bc70aaf6-8e2a-11e5-9a85-14a30811eb61.png" alt="screen shot 2015-11-18 at 7 29 37 pm" style="max-width: 100%;"></a></p>
<p dir="auto">My <code class="notranslate">jsconfig.json</code>:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="{
  &quot;compilerOptions&quot;: {
    &quot;target&quot;: &quot;ES6&quot;
  }
}"><pre class="notranslate"><code class="notranslate">{
  "compilerOptions": {
    "target": "ES6"
  }
}
</code></pre></div>
<p dir="auto"><strong>Edit</strong>: In retrospect this may simply be that template strings <em>aren't</em> highlighted, which causes this weird behavior.</p>
<p dir="auto">Right now, those keywords like <code class="notranslate">import</code> <code class="notranslate">class</code> <code class="notranslate">from</code> are all plain white.</p>