title: Rails Zeitwerk `Wrong constant name` for javascript
body: <p>Using Rails 6</p>
  <p>I have a folder like so <code>app/client/javascript/config/editor/syntax-highlighting</code></p>
  <p>2 files in there.</p>
  <p><code>app/client/javascript/config/editor/syntax-highlighting/math-mode.js</code>
  <code>app/client/javascript/config/editor/syntax-highlighting/units-regex.js</code></p>
  <p>When I deploy to production there error message is:</p>
  <p><code>Wrong constant name Syntax-Highlighting inferred by Module from directory (Zeitwerk::NameError)</code></p>
  <p>And it gives a path to that directory.
  <code>app/client/javascript/config/editor/syntax-highlighting</code></p>
  <p>What is the cause of this error?</p>