Update to Firebase Modular SDK

[lemasc]

First, thank you for this amazing library!

I've updated the firebase SDK to version 9 (beta) and changed any necessary hooks to make it works.
I also updated all dependencies to the latest version, but from my testing so far I still not found any breaking changes.

New SDK Type Errors

1. Most of the new Firestore functions now not accepting options as undefined. Can it be simplify than this?

Now I'm using something like:

2. There's a change with Firebase "SetOptions" type which causing type error. Now using //@ts-ignore

Here's the new definition

And now it showing me that

Any comments are appreciate. Actually I'm still new and learning typescript. If there's any change please reply me.

[nandorojo]

FWIW, I can add notes here that I see and help. However, as I mentioned on a separate issue, I'm no longer dedicated to this project and am looking for a maintainer.

As for the type issues: I think this PR would need to represent a major version bump. This means only supporting Firebase v9. So just use the normal types from firebase v9, and ignore the other ones.

[nandorojo]

As for the options?.merge issue.

One option is to use a type guard.

function isMerge(options: SetOptions): options is MergeType {
  return !!(options as MergeType)?.merge
}

- if (options?.merge)
+ if (isMerge(options))

I typed that on my phone so apologies if there's a formatting issue

But reading the intent of the code, it should probably be called shouldMerge and it should check for both merge and mergeFields

[lemasc]

@nandorojo Looks perfect! Thank you very much.

FWIW, I can add notes here that I see and help. However, as I mentioned on a separate issue, I'm no longer dedicated to this project and am looking for a maintainer.

I understand the situation. I think I can help this repo, but for only a period of time. When the COVID-19 pandemic ends, I need to go back to study. However I'm happy to do it anyway 😆.