export declare class IndexDBUtils {
    private static instance;
    private fontDB?;
    private readonly FONT_DB_NAME;
    private readonly FONT_STORE_NAME;
    private readonly FONT_DB_VERSION;
    private constructor();
    static getInstance(): IndexDBUtils;
    initFontDB(): Promise<IDBDatabase>;
    getFontFromDB(fontFamily: string): Promise<ArrayBuffer | null>;
    saveFontToDB(fontFamily: string, url: string, buffer: ArrayBuffer): Promise<boolean>;
    clearFontCache(): Promise<boolean>;
    getFontCacheStatus(): Promise<{
        count: number;
        totalSize: number;
    }>;
}