observe method
- Database db,
 - Transaction tx,
 - Map options
 
Implementation
void observe(Database db, Transaction tx, Map options) {
  var options_1 = convertDartToNative_Dictionary(options);
  _observe_1(db, tx, options_1);
  return;
}
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    https://api.dart.dev/stable/2.13.0/dart-indexed_db/Observer/observe.html