erator">:</span> <span class="builtin">any</span><span class="punctuation">)</span> <span class="operator">=></span> <span class="keyword">void</span></code></td><td><p>An optional handler for the errors that the <a href="/api/the-essentials/persisting-stores/persister/"><code>Persister</code></a> would otherwise ignore when trying to save or load data. This is suitable for debugging persistence issues in a development environment, since v4.0.4.</p></td></tr><tr><th class="right">returns</th><td><code><span