/**
 * Pure, IO-free comparison helpers for the idempotency round-trip checks. The
 * round-trip harness that drives these lives in the package's tests, not in the
 * engine.
 */
/**
 * Recursively strip every `attrs.id` from a ProseMirror node tree. Block ids
 * are regenerated by `markdownToProseMirror` (SPEC §11), so they must be
 * ignored when comparing the semantic shape of two documents. Returns a NEW
 * tree; the input is not mutated.
 */
export declare function stripBlockIds(node: any): any;
/**
 * Find the first divergence between two values via a recursive deep compare.
 * Returns a short path + the two differing values, or null if they are equal.
 */
export declare function firstDivergence(a: any, b: any, path?: string): {
    path: string;
    a: any;
    b: any;
} | null;