title: npm run watch gives errors after update to Mac OS X Mojave
body: <p>After upgrading the system I get the error as shown below while trying to run npm run watch.</p>
  
  <p>Npm version is 6.4.1
  Node v. 11.0.0</p>
  
  <pre><code>ERROR in ./node_modules/css-loader??ref--5-2!./node_modules/postcss-loader/lib??postcss!./node_modules/resolve-url-loader??ref--5-4!./node_modules/sass-loader/lib/loader.js??ref--5-5!./resources/sass/app.scss
  Module build failed: Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (67)
  </code></pre>
  
  <p>Anyone knows how to fix this? I googled for solutions and find eg. this one <a href="https://github.com/sass/node-sass/issues/1764" rel="nofollow noreferrer">https://github.com/sass/node-sass/issues/1764</a> but nothing helps.</p>