Add callback argument to render()

[mindplay-dk]

I just noticed in React docs that there's a third argument callback in ReactDOM's render() function:

ReactDOM.render(element, container[, callback])

According to the docs:

If the optional callback is provided, it will be executed after the component is rendered or updated.

This would be very useful for testing, at least.

What do you think about adding support for this?

[yisar]

Maybe we can do the same with options? For example, I rewrote commitWork here

[yisar]

Hey, let's continue to talk about this. For our test, I think we can add callbacks, but I'm sorry it may take a few days because our school Internet is not work yet.

[yisar]

I added options.resolve callback, which seems to solve the current problem.
here
It uses like this :

new Promise((resolve, reject) => {
  options.resolve = resolve
  render(<App />, root)
})

It is set by options and executed after the DOM operations.

[mindplay-dk]

Looks like this is done :-)