Sink/encoding.html">encoding</a>. <a href="dart-io/IOSink/add.html">[...]</a>
                  <div class="features">override</div>
</dd>
        <dt id="addError" class="callable">
          <span class="name"><a href="dart-io/IOSink/addError.html">addError</a></span><span class="signature">(<wbr><span class="parameter" id="addError-param-error"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">error</span>, [</span> <span class="parameter" 