Add types for currentTarget on event handlers for IntrinsicElem…

[loucyx]

Currently when doing something like:

const [value, setValue] = useState("");

return (
  <input onInput={event=>setValue(event.currentTarget.value)} />
);

We get an error because value is not defined on type EventTarget. With the change introduced in this PR, the currentTarget in this case is of type HTMLInputElement, and the same happens with all intrinsic elements.

[loucyx]

Fixed to work with SVG elements as well.

[coveralls]

Coverage remained the same at 99.891% when pulling d253353 on lukeshiru:jsx-event-target into 3664bd5 on preactjs:master.

[marvinhagemeister]

Wow, this is amazing!! Thank you so much for the PR 👍 ❤️

[malte-wessel]

how about the target property? I'm still struggling with making this work:

const [value, setValue] = useState("");

return (
  <input onInput={event=>setValue(event.target.value)} />
);

[marvinhagemeister]

@malte-wessel can you open a new issue? Closed issues or PRs quickly gets hidden in GitHub's UI.

[loucyx]

@malte-wessel you need to consider that while currentTarget is always the element that added the eventListener, target can be a child element, so:

1. Is a good practice to avoid target altogether and just use currentTarget.
2. If you really need target and you are sure a children will not trigger that event, then you can typecast that yourself in your use case:

<div onClick={event => {
  (event.target as HTMLDivElement).propertyYouWantToAccess
}></div>