/// 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.
/// 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: string, 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: string, key: string);
}