webpack.validateSchema is not a function
<p>Webpack are throwing this error all of a sudden:</p>

<blockquote>
  <p>TypeError: webpack.validateSchema is not a function</p>
</blockquote>

<p>Everything was working fine Friday, not working today. No new commits to master since Friday.</p>

<p>Pruned NPM, that didn't work, deleted NPM folder and re-installed, no dice. Checked out to previous branches which have not been rebased from Master for over a week. Still the same.</p>

<p>Anyone have an idea?</p>