title: Yarn install not working, getting "Other managers are not allowed"
body: <p>I just started using yarn package manager in one of my project. I installed yarn globally using <code>sudo npm install yarn -g</code></p>
  
  <p>But when I tried to install dependencies using <code>yarn install</code> I was getting the following on the CLI</p>
  
  <pre><code>info No lockfile found.
  $ node tools/preinstall
  =========================================
  Please install / add dependencies via npm
  Other managers are not allowed
  =========================================
  error Command failed with exit code 1.
  info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
  
  </code></pre>
  
  <p>That's weird. Any idea why am I getting this? Is there anyway I can enable yarn for my project?</p>
  
  <p>Thanks in anticipation</p>