title: Yarn install says up to date, yet can't start rails console
body: <p>I've been developing an app using Webpack, Vue.js and Rails. No problems for two months, but out of nowhere when I try to start rails console <code>rails c</code>, <code>yarn</code> complains that packages out of date:</p>
  
  <pre><code>error An unexpected error occurred: "Unknown language key integrityNodeDoesntMatch".
  info If you think this is a bug, please open a bug report with the information provided in "/Users/maksimfedotov/vras/yarn-error.log".
  info Visit https://yarnpkg.com/en/docs/cli/check for documentation about this command.
  
  
  ========================================
    Your Yarn packages are out of date!
    Please run `yarn install` to update.
  ========================================
  </code></pre>
  
  <p>Yet when I run <code>yarn install</code>:</p>
  
  <pre><code>yarn install v1.3.2
  [1/4]   Resolving packages...
  success Already up-to-date.
  ✨  Done in 0.71s.
  </code></pre>
  
  <p>I've been looking through yarn and webpacker documentation, tried various <code>yarn</code> cleanup commands, but no luck.</p>
  
  <p>Interestingly enough, I can still run the server, its only console that complains. </p>