export type DiffLine = {
    type: 'same' | 'add' | 'del' | 'skip';
    text: string;
};
/**
 * Diffs two JSON-encoded values line by line, git-style. Returns null unless
 * both parse to objects/arrays whose changed region is small enough to diff —
 * callers fall back to the plain from/to blocks.
 */
export declare function jsonLineDiff(from: string, to: string, context?: number): DiffLine[] | null;