Migration progress

[achingbrain]

At the moment there's no progress available during a migration. These can take a long time so it's a poor user experience.

You should be able to pass a callback that gets invoked with some sort of notion of how much information has been processed and how much is left.

[AuHau]

Well, there is the onProgress callback, but this only reports on what migration you are currently migrating... Just to think about if the "in-migration-progress" should be part of this callback or it should be a different one.

[achingbrain]

Yes, I was thinking something a bit more fine-grained, though obviously it becomes harder to be generic as the migrations are not typically similar.

Something like this would probably work:

migrate(..., {
  onProgress: ({ migration: { from, to }, percent, message }) => {}
})