mirror: A fast canonicalisation utility for stable object equality
chore: test all supported values over-the-wire stability
Marais Rossouw
(Jun 25, 2026, 3:24 PM +1000)
5e8d86a4
c2bddd38
+32
+32
lib/mod.test.ts
+32
lib/mod.test.ts
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import { assert, assertEquals, assertNotEquals, assertNotMatch, assertThrows } from '@std/assert';
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import fc from 'fast-check';
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import { Buffer } from 'node:buffer';
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import { identify } from '../lib/mod.ts';
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Deno.test('exports :: identify is a function', () => {
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//
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// These lock the exact serialization. A change here is a breaking change to every
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// previously-stored identity, so update deliberately.
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Deno.test('format :: supported builtins serialize consistently', () => {
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const assertWire = (name: string, input: unknown, expected: string) =>
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assertEquals(identify(input), expected, name);
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assertWire('array', [1, undefined, 'x'], 'an1Lsx');
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assertWire('bigint', 123n, 'n123');
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assertWire('bigint64 array', new BigInt64Array([-1n, 2n]), 'o0n-11n2');
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assertWire('biguint64 array', new BigUint64Array([1n, 2n]), 'o0n11n2');
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assertWire('boolean', true, 'T');
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assertWire('buffer', Buffer.from([1, 2]), 'o0n11n2');
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assertWire('data view', new DataView(new Uint8Array([1, 2]).buffer), 'o');
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assertWire('date', new Date(0), 'd0');
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assertWire('float32 array', new Float32Array([1.5, -2.25]), 'o0n1.51n-2.25');
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assertWire('float64 array', new Float64Array([1.5, -2.25]), 'o0n1.51n-2.25');
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assertWire('int8 array', new Int8Array([-1, 2]), 'o0n-11n2');
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assertWire('int16 array', new Int16Array([-1, 2]), 'o0n-11n2');
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assertWire('int32 array', new Int32Array([-1, 2]), 'o0n-11n2');
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assertWire('map', new Map([['b', 2], ['a', 1]]), 'oan1bn2');
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assertWire('null', null, 'L');
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assertWire('object', { b: 2, a: 1 }, 'oan1bn2');
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assertWire('regexp', /ab/gi, 'rabgi');
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assertWire('set', new Set([1, 2]), 'en1n2');
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assertWire('string', 'hello', 'shello');
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assertWire('uint8 array', new Uint8Array([1, 2]), 'o0n11n2');
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assertWire('uint8 clamped array', new Uint8ClampedArray([1, 255]), 'o0n11n255');
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assertWire('uint16 array', new Uint16Array([1, 2]), 'o0n11n2');
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assertWire('uint32 array', new Uint32Array([1, 2]), 'o0n11n2');
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//assertWire('custom toJSON', { toJSON: () => ({ a: 1, b: [2] }) }, 'oan1ban2');
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//assertWire('url', new URL('https://example.com/a?b=1#c'), 'shttps://example.com/a?b=1#c');
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});
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Deno.test('format :: circular array back-reference', () => {
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const arr: unknown[] = [1, 2, 3];