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