/**
 * BookmarkEntry - Metadata for a saved bookmark.
 */
export interface BookmarkEntry {
    /** Stable key identifying the block (e.g. 'msg_3_code_1'). */
    key: string;
    /** Human-readable label (block type + short excerpt). */
    label: string;
    /** Timestamp when bookmarked. */
    timestamp: number;
}
/**
 * BookmarkManager - Tracks bookmarked blocks and saves block content to disk.
 *
 * Bookmarks are stored in memory for the session. Saved block content is
 * written to the configured bookmarks directory.
 */
export declare class BookmarkManager {
    private bookmarks;
    private saveDir;
    constructor(baseDir: string);
    /**
     * toggle - Toggle bookmark state for a block key.
     * Returns the new state: true = bookmarked, false = removed.
     */
    toggle(key: string, label?: string): boolean;
    /**
     * isBookmarked - Check if a block key is bookmarked.
     */
    isBookmarked(key: string): boolean;
    /**
     * list - Return all current bookmarks sorted by timestamp.
     */
    list(): BookmarkEntry[];
    /**
     * clear - Remove all bookmarks.
     */
    clear(): void;
    /**
     * saveToFile - Write block content to a file in the bookmarks directory.
     * Returns the file path on success, or throws on failure.
     */
    saveToFile(content: string, label: string): string;
    /**
     * listSavedFiles - List all previously saved block content files.
     */
    listSavedFiles(): string[];
    /**
     * loadSavedFile - Read a previously saved block content file by name.
     */
    loadSavedFile(name: string): string | null;
}
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