The argument type 'Map Function()' can't be assigned to the parameter type 'Map'

Question

This could initially was working but after firebase update, it is now giving me this error. I have added asterisks to the part giving the error. The error message has been

Answer 1

It's because DocumentSnapshot.data() is a function that returns Map.

So, the answer is:

  Record.fromSnapshot(DocumentSnapshot snapshot)
      : this.fromMap(snapshot.data(), reference: snapshot.reference);