title: (React-Native) undefined is not a constructor evaluating 'new FormData()'
body: <p>for the past 2 days I struggled with this problem and can't figure it out.
  I don't understand this error. this is my code:</p>
  
  <pre><code>try{
  var formData = new FormData();
  } catch (error) {
  console.error('FormData ERROR', error);
  }
  </code></pre>
  
  <p>and this is the error:</p>
  
  <blockquote>
    <p>017-06-21 13:49:02.761 [error][tid:com.facebook.React.JavaScript]
    'FormData ERROR', { [TypeError: undefined is not a constructor
    (evaluating 'new FormData()')] line: 98419, column: 36, sourceURL:
    '<a href="http://localhost:8081/index.ios.bundle?platform=ios&amp;dev=true&amp;minify=false" rel="noreferrer">http://localhost:8081/index.ios.bundle?platform=ios&amp;dev=true&amp;minify=false</a>'
    }</p>
  </blockquote>
  
  <p>Do i have to add support for FormData in ReactNative 0.45.0?
  please help </p>