e">futureValue</span></span> ])
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;E&gt;</span></span>
          </span>
        </dt>
        <dd class="inherited">
          Discards all data on the stream, but signals when it's done or an error
occurred. <a href="dart-async/Stream/drain.html">[...]</a>
          <div class="features">inherited</div>
</dd>
        <dt id="elementAt" class="callable inherited">
          <span