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Thank you @shiiinji! I've left a few comments, but once they're resolved I'd be happy to merge this.

I appreciate your great feedbacks.
I resolved the issues.

One more change - can you please run yarn docs at the root of the repository? That will auto-generate reference docs for the new features you've added.

One more change - can you please run yarn docs at the root of the repository? That will auto-generate reference docs for the new features you've added.

I run yarn docs and commited the auto-generate reference docs by #d000464.

Thanks again @shiiinji! These changes are available now with

npm install reactfire@exp

# OR

yarn add reactfire@exp

And will be included in an upcoming release!

Thank your great feedbacks.