`event["target"]["checked"]` does not exist for checkbox inputs

[Archmonger]

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Current Situation

In ReactJS, event.target.checked would exist for checkboxes. However, this does not appear to be the case for ReactPy.

See the example in the docs for a scenario that should have worked.

Proposed Actions

Determine why our client side event handler isn't propagating the entire target context to the server.

[rmorshea]

I think that can be fixed right here by adding checked: element.checked.

[Archmonger]

@rmorshea Is there a chance there's a better way of doing this? I'm not seeing anywhere within preact's source code where they statically define event contents like this.

[DennisHC]

BUTTON: (element: HTMLInputElement) => ({ value: element.value, checked: element.checked }),

I found that when adding checked: element.checked, a TypeScript error appears stating that "Property 'checked' does not exist on type 'HTMLButtonElement', may need to find another workaround.

[DennisHC]

Proposed change: INPUT: (element: HTMLInputElement) => ({ value: element.value, checked: element.checked })

Since the issue is referred to the checkboxes needing a checked attribute, I believe this may fix it here.

[rmorshea]

That seems correct to me.