code: def install_npm_modules():
      
      # This is a little weird, but we do it this way because if you
      # have package.json, then heroku thinks this might be a node.js
      # app.
      call_command('cp node.json package.json', verbose=True)
      call_command('npm install', verbose=True)
      call_command('rm package.json', verbose=True)
docs: Uses npm to dependencies in node.json