import ExcalidrawPlugin from "src/main";
import { PreviewImageType } from "./UtilTypes";
type BackupData = string;
export type ImageKey = {
    filepath: string;
    blockref: string;
    sectionref: string;
    isDark: boolean;
    previewImageType: PreviewImageType;
    scale: number;
};
declare class ImageCache {
    private dbName;
    private cacheStoreName;
    private backupStoreName;
    private db;
    private isInitializing;
    plugin: ExcalidrawPlugin;
    initializationNotice: boolean;
    private obsidanURLCache;
    constructor(dbName: string, cacheStoreName: string, backupStoreName: string);
    private initializeDB;
    private purgeInvalidCacheFiles;
    private purgeInvalidBackupFiles;
    private getObjectStore;
    private getCacheData;
    private getBackupData;
    isReady(): boolean;
    getImageFromCache(key_: ImageKey): Promise<string | SVGSVGElement | undefined>;
    getBAKFromCache(filepath: string): Promise<BackupData | null>;
    addImageToCache(key_: ImageKey, obsidianURL: string, image: Blob | SVGSVGElement): void;
    addBAKToCache(filepath: string, data: BackupData): Promise<void>;
    clearImageCache(): Promise<void>;
    clearBackupCache(): Promise<void>;
    private clear;
}
export declare const imageCache: ImageCache;
export {};