.04 35 9.69 52.73.5 13.9 17.45 20.44 27.29 10.6l37.1-37.1c59.28-59.26 59.28-155.7 0-214.96z"/>
      </svg></a> </h3>
<section aria-labelledby="toc_watchman-optional">
<p>On Mac and Linux, you can improve file watching performance by installing <a href="https://facebook.github.io/watchman/docs/install.html">Watchman</a>.</p>
</section>
<h3 id="toc_phantomjs-optional">PhantomJS (optional) <a href="#toc_phantomjs-optional"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
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