Using on:input on an Input element in svelte I am getting a casting error

In svelte using on:input on an input element, I am trying to properly cast the type and it does work but I am getting a typescript error in the editor:

Property data does not exist on type Event & { currentTarget: EventTarget & HTMLInputElement; }. ts(2339)

on:input={(elm) => {    if (elm.data !== null) {        // not null    }}}