title: Getting error TS2304: Cannot find name 'Buffer'
body: <p>I am trying to do base64 encode in NodeJS using TypeScript. </p>
  
  <p>Following code working fine in JavaScript.</p>
  
  <p>When I am writing same thing in TypeScript and compiling, I am getting Buffer is not find error.</p>
  
  <pre><code>var base64Policy = new Buffer(stringPolicy, 'utf-8').toString('base64');
  </code></pre>
  
  <p>Can someone help me to do same thing in TypeScript.</p>