Why doesn't Preact allow adding an extended signal as children?

[denisavitski]

Like so:

class MySignal<T> extends Signal<T> {
  constructor(value: T) {
    super(value)
  }
}

const mySignal = new MySignal(0)

export const App = () => {
  return <div>{mySignal}</div>
}

Uncaught Error: Objects are not valid as a child.

[rschristian]

What version of Preact are you using? Should work fine: https://stackblitz.com/edit/vitejs-vite-yuwwvx?file=package.json

[denisavitski]

I found out that in version 10.19.3 this does not work, but in 10.19.2 it works well

[rschristian]

Ah, indeed. Looks like this was an intentional fix recently: preactjs/preact#4219 (comment)

Might want to ask on the Preact repo, I'm not aware of the context there myself.