Request: expose action to when

[timhwang21]

Do you want to request a feature or report a bug?

Feature

What is the current behavior?

The when callback takes two arguments: previous location and next location. block from React Router also exposes action. It would be useful to expose this to when as a third argument. For example, one may want to not trigger the confirmation on 'REPLACE' events.

In my case, we sometimes use 'REPLACE' to open subpages that still exist within the context of the "main" page, and we don't want the confirmation to pop up. This isn't a blocker for us as we can compare the two locations for root route or something, but using the action would be far easier.

If this is reasonable, I can file a PR!

[ZacharyRSmith]

@timhwang21 makes sense to me. Please PR. Thanks!

[ZacharyRSmith]

pub'd to npm: https://www.npmjs.com/package/react-router-navigation-prompt