title: How can I save newly-created node modules to my package.json?
body: <p>I make new features as node modules. </p>
  
  <pre><code> mkdir node_modules/some-feature
   cd node_modules/some-feature
   npm init
  </code></pre>
  
  <p>Of course, when I shrinkwrap, I get error messages like:</p>
  
  <pre><code>npm ERR! extraneous: some-feature@0.0.0 /myprojectdir/node_modules/some-feature
  
  npm ERR! extraneous: something-else@0.0.0 /myprojectdir/node_modules/something-elsear
  </code></pre>
  
  <p>Is there a quick way to save the newly created extraneous packages to <code>package.json</code>?</p>