export declare abstract class OfflineQueueStorageStrategy<T = any> {
    abstract loadQueue(): Promise<T[]>;
    abstract saveQueue(queue: T[]): Promise<void>;
}
export declare class MemoryOfflineStorage<T = any> extends OfflineQueueStorageStrategy<T> {
    private _queue;
    constructor();
    loadQueue(): Promise<T[]>;
    saveQueue(queue: T[]): Promise<void>;
}
export declare class LocalStorageOfflineStorage<T = any> extends OfflineQueueStorageStrategy<T> {
    readonly key: string;
    constructor(key?: string);
    loadQueue(): Promise<T[]>;
    saveQueue(queue: T[]): Promise<void>;
}