"><a href="/api/store/type-aliases/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></code></td><td><p>The function that will be called whenever data in the matching <a href="/api/store/type-aliases/store/value/"><code>Value</code></a> changes.</p></td></tr><tr><th><code>mutator<span class="operator">?</span></code></th><td><code><sp