update
abstract fun update(documentReference: DocumentReference, data: <Error class: unknown class>): WriteBatch(source)
abstract fun update(documentReference: DocumentReference, field: String, value: <Error class: unknown class>?, vararg moreFieldsAndValues: <Error class: unknown class>?): WriteBatch(source)
abstract fun update(documentReference: DocumentReference, field: FieldPath, value: <Error class: unknown class>?, vararg moreFieldsAndValues: <Error class: unknown class>?): WriteBatch(source)