import type { ViewerSettings } from "../types";
export interface StorageOptions {
    enabled?: boolean;
    databaseName?: string;
}
export declare class IndexedDbStorage {
    private enabled;
    private databaseName;
    private dbPromise?;
    constructor(options?: StorageOptions);
    getSettings(): Promise<Partial<ViewerSettings> | undefined>;
    saveSettings(settings: Partial<ViewerSettings>): Promise<void>;
    /** 作品ごとに保持する設定（pageTurnMode / hasCover / readingDirection 等）。 */
    getMangaSettings(mangaId: string): Promise<Partial<ViewerSettings> | undefined>;
    saveMangaSettings(mangaId: string, settings: Partial<ViewerSettings>): Promise<void>;
    getProgress(mangaId: string): Promise<number | undefined>;
    saveProgress(mangaId: string, pageIndex: number): Promise<void>;
    saveLayout(layout: Record<string, unknown>): Promise<void>;
    getLayout<T extends Record<string, unknown>>(): Promise<T | undefined>;
    private get;
    private put;
    private delete;
    private store;
    private open;
}
//# sourceMappingURL=indexed-db-storage.d.ts.map