title: 'npm' is not recognized as an internal or external command error in Developer Command Prompt for VS2015
body: <p>I am trying to execute <code>npm install –g tsd</code> in Developer Command Prompt for VS2015.</p>
  
  <p>But it returns </p>
  
  <blockquote>
    <p>'npm' is not recognized as an internal or external command,
    operable program or batch file.</p>
  </blockquote>
  
  <p>Any idea?</p>