/**
 * Abstract class that defines the contract for an asynchronous state persister.
 * An async persister is responsible for saving and loading state to a storage medium using asynchronous operations.
 *
 * This is useful for scenarios where persistence involves asynchronous APIs, such as IndexedDB, remote storage, or custom async backends.
 *
 * Implementations should provide methods to load, save, and clear persisted state for a given key.
 *
 * See also: `Persister` for synchronous persister implementations.
 */
export declare abstract class AsyncPersister<TState, TSelected extends Partial<TState> = TState> {
    readonly key: string;
    constructor(key: string);
    abstract loadState: () => TSelected | undefined;
    abstract saveState: (state: TState) => void;
    abstract clearState: (useDefaultState?: boolean) => void;
}