title: Flutter delete Directory file
body: <p>I want to delete file in <code>Directory</code>.
  It is created like so.</p>
  
  <pre><code>final Directory extDir = await getTemporaryDirectory();
  final String dirPath = '${extDir.path}/video';
  await new Directory(dirPath).create(recursive: true);
  final String filePath = '$dirPath/${timestamp()}.mp4';
  </code></pre>
  
  <p>I want to delete this specific path so that app won't heavy. 
  How can I do this?<br>
  Does anyone have an idea?</p>