Clear collection

[aronrodrigues]

There is any flag/attribute/command to clear the collection prior to a restore?

[aronrodrigues]

Pull request: #20

[Joebayld]

I would also like to see this. Another library has a similar function - but the library isn't maintained anymore.

https://github.com/jloosli/node-firestore-import-export#clearing

Some sort of function for a recursive delete would be useful - since a lot of the helper functions already exist in this library.