.base</a>)</span><a class="member-source-link" href="https://github.com/apple/pkl/blob/0.24.0/stdlib/base.pkl#L123-L456">Source</a></div>
                <div class="doc-comment"><p>Returns <code>this |&gt; transform</code> if <code>this</code> is non-null, and <code>null</code> otherwise.</p></div>
                <div class="doc-comment expandable hidden collapsed"><p>This method is the complement of the <code>??</code> operator and the equivalent of an <code>Option</code> type's <code>map</code> and <cod