/**
 * Structural JSON equality, key-order independent — the ONE copy two seams share
 * (`transcript-rules.ts` and `harness-state.ts`). Both compare wire-serializable
 * UIMessage parts; a second private copy of the same comparison is how the two
 * drifted apart on undefined-key handling before this was unified.
 *
 * `ignoreUndefined` is the ONLY difference the two callers ever needed:
 *  - transcript-rules leaves it off (its `isApprovalResponse` check must treat a
 *    part carrying an explicit `undefined` prop as DISTINCT — the conservative,
 *    reject-the-flip direction);
 *  - harness-state turns it on, because a message that round-tripped the wire
 *    (which drops `undefined`) must not read as an edit against a stored copy
 *    that still carries one, or it would falsely clear the harness session.
 */
export declare function jsonEqual(left: unknown, right: unknown, ignoreUndefined?: boolean): boolean;
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