Enable navigation blocker based on "next" route

[chrisbenincasa]

I'm wondering if there is a way to recreate the functionality from react-router v6's useBlocker, which can determine blocked state based on the "next" location (about to transition): https://reactrouter.com/en/main/hooks/use-blocker.

I've gotten close with watching changes in location.pathname - but this change seems to fire after the transition has begun and after the blocker has permitted the action. Is there a way to preempt the transition and update the blocking condition based on the upcoming path?

[salemlf]

There's a PR in progress to implement this: #1790

I'm also needing the same behavior and haven't been able to find any hacky workarounds in the meantime