堀川登喜矢

<p>github issuesにある通り、nullかundefinedの時はtureを返すようにthis.testのカスタムメソッドに条件分岐を加えて上げれば良い。<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__31477115fef47" src="https://embed.zenn.studio/card#zenn-embedded__31477115fef47" data-content="https%3A%2F%2Fgithub.com%2Fjquense%2Fyup%2Fissues%2F1212" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://github.com/jquense/yup/issues/1212" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://github.com/jquense/yup/issues/1212</a></p>
