/**
 * Line-based diff utilities using LCS (Longest Common Subsequence).
 *
 * @module
 */
/** Line diff result */
export interface DiffLine {
    type: 'same' | 'add' | 'remove';
    line: string;
}
/**
 * Generate a line-based diff between two strings using LCS algorithm.
 *
 * @param a - the original/current content
 * @param b - the new/desired content
 */
export declare const diff_lines: (a: string, b: string) => Array<DiffLine>;
/**
 * Filter diff to only include lines within N lines of context around changes.
 *
 * @param context_lines - number of context lines to show around changes (default: 3)
 * @returns filtered diff with ellipsis markers for skipped regions
 */
export declare const filter_diff_context: (diff: Array<DiffLine>, context_lines?: number) => Array<DiffLine>;
/**
 * Format options for diff output.
 */
export interface FormatDiffOptions {
    /** Prefix for each line (for indentation in plan output). */
    prefix?: string;
    /** Whether to use ANSI colors. */
    use_color?: boolean;
    /** Maximum number of diff lines to show (0 = unlimited). */
    max_lines?: number;
}
/**
 * Format a diff for display.
 *
 * @param current_path - path label for "current" content
 * @param desired_path - path label for "desired" content
 */
export declare const format_diff: (diff: Array<DiffLine>, current_path: string, desired_path: string, options?: FormatDiffOptions) => string;
/**
 * Generate a formatted diff between two strings.
 *
 * Combines `diff_lines`, `filter_diff_context`, and `format_diff` for convenience.
 * Returns null if content is binary.
 *
 * @param path - file path for labels
 */
export declare const generate_diff: (current: string, desired: string, path: string, options?: FormatDiffOptions) => string | null;
//# sourceMappingURL=diff.d.ts.map