s/listener/valuelistener/">ValueListener</a></span><span class="operator">&lt;</span><span class="type"><a href="/api/mergeable-store/interfaces/mergeable/mergeablestore/">MergeableStore</a></span><span class="operator">></span><span class="punctuation">,</span>
  mutator<span class="operator">?</span><span class="operator">:</span> <span class="builtin">boolean</span><span class="punctuation">,</span>
<span class="punctuation">)</span><span class="operator">:</span> <span class="builtin">string</span></cod