A value wrapper for streams & ValueListenables that can be bound to a datasource.

The datasource can be another Stream, ValueListenable or a KVStore, which is a key-value store abstraction plugin.

var store = KVStore.build( 'test_box' );
await store.init();
await store.open();
const String key = 'test_key_1';

ObservableValue observable = ObservableValue<int>(
  key: key,
  defaultValue: 0,
);

observable.bind(
  store,
);

expect( observable.value, equals( 0 ) );

await store.set( key, 1 );

expect( observable.value, equals( 1 ) );

await store.set( key, 2 );

expect( observable.value, equals( 2 ) );