art-core/String-class.html">String</a></span> <span class="parameter-name">prefix</span></span> ])
            <span class="returntype parameter">&#8594; <a href="dart-io/Directory-class.html">Directory</a></span>
          </span>
                  </dt>
        <dd>
          Synchronously creates a temporary directory in this directory.
Additional random characters are appended to <code>prefix</code> to produce
a unique directory name. If <code>prefix</code> is missing or null, the empty
string is used f