/// A keyvalue interface that provides watch operations.
/// 
/// This interface is used to provide event-driven mechanisms to handle
/// keyvalue changes.
interface watcher {
  /// A keyvalue interface that provides handle-watch operations.
  use store.{bucket};

  /// Handle the `set` event for the given bucket and key. It includes a reference to the `bucket`
  /// that can be used to interact with the store.
  on-set: func(bucket: bucket, key: string, value: list<u8>);

  /// Handle the `delete` event for the given bucket and key. It includes a reference to the
  /// `bucket` that can be used to interact with the store.
  on-delete: func(bucket: bucket, key: string);
}