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import assert from 'node:assert/strict'; import { describe, it } from 'node:test'; import { stableStringify } from '../dist/lib/json.js'; describe('stableStringify', () => { it('serializes shared references without treating them as circular', () => { const shared = { a: 1 }; const value = { y: shared, x: shared }; const result = stableStringify(value); assert.equal(result, '{"x":{"a":1},"y":{"a":1}}'); }); it('throws on circular references', () => { const obj: Record<string, unknown> = {}; obj.self = obj; assert.throws(() => stableStringify(obj), /Circular reference/); }); });