fault <a href="dart-io/File/writeAsString.html">writeAsString</a> creates the file for writing and truncates the
file if it already exists. In order to append the bytes to an existing
file, pass <a href="dart-io/FileMode/append-constant.html">FileMode.append</a> as the optional mode parameter.</p>
<p>If the argument <code>flush</code> is set to <code>true</code>, the data written will be
flushed to the file system before the returned future completes.</p>
    </section>
    
    <section class="summary sour