title: How to solve `package-json found. ... To clear this warning, remove package-lock.json`, I think it was overlapped by npm when yarn install
body: <p>I used the command <code>yarn install</code> in Visual Studio Code, but it ocurred error. following error message.</p>
  
  <pre><code>package-lock.json found.
  Your project contains lock files generated by tools other than Yarn.
  It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files.
  To clear this warning, remove package-lock.json.
  </code></pre>
  
  <p>I think it was overlapped by npm 
  <code>package-lock.json</code> conflict with yarn.lock.</p>
  
  <p>Action against the problem.</p>
  
  <p>remove <code>package-lock.json</code>, remove <code>node_modules</code></p>
  
  <p>This problem remain unsolved.</p>
  
  <p>thank you!</p>