import type { CanonicalModel } from "./normalize.js";
/** True when two canonical models are structurally equal (all three multisets
 *  match). */
export declare function modelsEqual(expected: CanonicalModel, actual: CanonicalModel): boolean;
/** Render a legible red/green structural diff, or `""` when the two models are
 *  structurally equal. `-`/red is the `expected` (golden) side, `+`/green the
 *  `actual` (derived) side. */
export declare function diffModels(expected: CanonicalModel, actual: CanonicalModel): string;