fix(types) move static firestore interface to where it's implemented#1013

Merged

prescottprue merged 2 commits intoprescottprue:v3.8.0from

zozoens31:firestore-statics

Nov 17, 2020

Commits on Oct 8, 2020

Move the FirestoreStatics interface to where it's actually implemented by Firebase.
zozoens31
committed

Commits on Nov 17, 2020

Merge branch 'v3.8.0' into firestore-statics
prescottprue
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