import { default as Database } from 'better-sqlite3';
import { ContentDiff } from './types.js';
/**
 * Manages content history (diffs) for transcript content
 */
export declare class HistoryManager {
    private db;
    constructor(db: Database.Database);
    /**
     * Save a content change as a diff
     */
    saveContentChange(contentId: number, oldText: string, newText: string): void;
    /**
     * Get all diffs for a content item
     */
    getContentHistory(contentId: number): ContentDiff[];
    /**
     * Reconstruct content at a specific point in time
     * Applies diffs in reverse order from current content
     */
    reconstructContentAtVersion(contentId: number, versionId: number): string | null;
    /**
     * Get the number of versions for a content item
     */
    getVersionCount(contentId: number): number;
    /**
     * Reverse a unified diff patch (swap additions and deletions)
     */
    private reversePatch;
}
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