export interface DiffLine {
    op: 'add' | 'remove' | 'keep';
    val: string;
}
/**
 * Shortest Edit Script (SES) using Myers' algorithm.
 * O((N+M)D) time and space complexity.
 */
export declare function myersDiff(a: string[], b: string[]): DiffLine[];
/**
 * Renders a professional ANSI diff between two strings.
 * Shows contextLines lines of context around changes,
 * collapses large unchanged blocks with a separator.
 */
export declare function renderDiff(oldText: string, newText: string, contextLines?: number): string;
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