&nbsp;async(boolean&nbsp;async)</pre>
<div class="block">Allows modification of the asynchronous status of the observer to build.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>async</code> - async status</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>self</dd>
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