/**
 * Diff utilities for extracting changes between old and new content
 */
/**
 * Extract only the added lines from a diff between old and new text.
 * This gives us exactly what the AI wrote, not the entire file.
 */
export declare function extractAddedContent(oldText: string, newText: string): string;
/**
 * Check if two pieces of content are substantially the same
 * (ignoring whitespace differences)
 */
export declare function contentMatches(a: string, b: string): boolean;