title: npm outdated output colour-coding meaning
body: <p>I run git command <code>npm outdated</code> in bash on a mac.</p>
  
  <p>See the output in the image below.</p>
  
  <p>Does anyone know why the first four packages are printed in red?</p>
  
  <p>I guess it's because I have them pointing to github repos in my package.json, but why the red? </p>
  
  <p>Is it a warning? Should I worry?</p>
  
  <p>Thank you.</p>
  
  <p><img src="https://i.stack.imgur.com/8aQrV.png" alt="enter image description here"></p>