getKeys method
Emits all the keys that currently exist - which means keys that have a non-null value.
Whenever there's a value associated for a new key, emits all the existing keys along the newly added key. If a value for a specific key gets removed (or set to null), emits a set of current keys without the recently removed key.
If there are no keys, emits an empty Set
.
Implementation
Preference<Set<String>> getKeys() {
return _getValue(
// ignore: invalid_use_of_internal_member
Preference.$$_getKeysKey,
defaultValue: Set(),
adapter: _GetKeysAdapter.instance,
);
}