title: Use helpers inside <script type="text/x-handlebars-template"> handlebars template
body: <p>I use handlebars.js with keystone.js. So to embed values inside my <code>&lt;script type="text/x-handlebars-template"&gt;</code> templates I add <code>\</code> before handlebars expressions. Like this:</p>
  
  <pre><code>&lt;script type="text/x-handlebars-template"&gt;
     &lt;img src="\{{mainImage}}"&gt;
  &lt;/script&gt;
  </code></pre>
  
  <p>The problem is embedding of helper value. I tried to use default cloudinaryUrl helper but it doesn't work:</p>
  
  <pre><code>&lt;script type="text/x-handlebars-template"&gt;
     &lt;img src="\{{{cloudinaryUrl mainImage quality='auto' format='jpg'}}}"
  &lt;/script&gt;
  </code></pre>
  
  <p>I see <code>Missing helper: "cloudinaryUrl"</code> message in my console.
  How can I fix it?</p>