How do I use oninput this.reportValidity in svelte

This code works perfectly in HTML

<input type="text" name="country" pattern="[A-z]{3}"    oninput="if (typeof this.reportValidity === 'function') {this.reportValidity();}"/>

How do I use it in Svelte.oninput is not allowed. I tried on:input, but I don't have access to this