import type { OneFSAdapter, OneFSFile, OneFSOpenOptions, OneFSSaveOptions, StoredHandle, OneFSResult } from '../types';
/**
 * Fallback adapter for browsers without File System Access API.
 * Uses <input type="file"> for selection and downloads for saving.
 *
 * Note: saveFile() triggers a download rather than saving in-place.
 * Check capabilities.canSaveInPlace to detect this behavior.
 */
export declare class PickerIDBAdapter implements OneFSAdapter {
    platform: "web-fallback";
    private storage;
    private persistByDefault;
    constructor(appName: string, maxRecentFiles?: number, persistByDefault?: boolean);
    isSupported(): boolean;
    openFile(options?: OneFSOpenOptions): Promise<OneFSResult<OneFSFile | OneFSFile[]>>;
    /**
     * "Save" by triggering a download. Does not save in-place.
     * The file is also stored in IndexedDB for restoration via getRecentFiles().
     */
    saveFile(file: OneFSFile, content: Uint8Array | string, options?: OneFSSaveOptions): Promise<OneFSResult<boolean>>;
    /**
     * Save as a new file by triggering a download.
     */
    saveFileAs(content: Uint8Array | string, options?: OneFSSaveOptions): Promise<OneFSResult<OneFSFile>>;
    private triggerDownload;
    getRecentFiles(): Promise<StoredHandle[]>;
    restoreFile(stored: StoredHandle): Promise<OneFSResult<OneFSFile>>;
    removeFromRecent(id: string): Promise<void>;
    clearRecent(): Promise<void>;
    dispose(): void;
}