span class="signature">(<wbr>{<span class="parameter" id="toStringDeep-param-prefixLineOne"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/dart-core/String-class.html">String</a></span> <span class="parameter-name">prefixLineOne</span> = <span class="default-value">&#39;&#39;</span>, </span><span class="parameter" id="toStringDeep-param-prefixOtherLines"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/dart-core/String-class.html">String</a>?</span> <span class=