Opting out of beforeunload and using BFCache about history

[mjackson]

Hmm, interesting. What do you think about adding a flag to the options object?

var history = createHistory({
  useBeforeUnload: false
});

I'd think if you want to disable something like this you'd want to disable it for all transition hooks, so setting the option globally makes sense.

As far as listening for the pageshow event, let's get that added in a separate PR and close the router bug.

[mjackson]

Personally, I would avoid it in most cases

Just re-read this. I think you're right. Maybe we make it opt-in instead in that case?

var history = createHistory({
  useBeforeUnload: true
});

[agundermann]

Yeah, I'd actually prefer opt-in. Also agree with your reasoning for using an options flag.

[mjackson]

Taking a look at this today. I think it makes sense to opt-in to beforeunload handling using an enhancer, ala enableQueries. It's different enough from normal transitions that I think it warrants its own API.