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feat(codemode): expand standard library parity (#37943)

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Aiden Cline 2026-07-20 09:59:37 -05:00 • committed by GitHub
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11 changed files with 171 additions and 15 deletions
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32
packages/codemode/test/array-core-test262.test.ts
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@ -29,6 +29,11 @@
* - test/built-ins/Array/prototype/splice/S15.4.4.12_A1.1_T1.js
* - test/built-ins/Array/prototype/splice/S15.4.4.12_A1.2_T1.js
* - test/built-ins/Array/prototype/splice/called_with_one_argument.js
* - test/built-ins/Array/prototype/toSpliced/holes-not-preserved.js
* - test/built-ins/Array/prototype/toSpliced/immutable.js
* - test/built-ins/Array/prototype/toSpliced/start-and-deleteCount-undefineds.js
* - test/built-ins/Array/prototype/toSpliced/start-and-deleteCount-missing.js
* - test/built-ins/Array/prototype/toSpliced/start-undefined-and-deleteCount-missing.js
* - test/built-ins/Array/prototype/fill/fill-values.js
* - test/built-ins/Array/prototype/fill/fill-values-custom-start-and-end.js
* - test/built-ins/Array/prototype/fill/return-this.js
@ -59,6 +64,8 @@
* Copyright 2015 Microsoft Corporation. All rights reserved.
* Copyright 2016 The V8 project authors. All rights reserved.
* Test262 portions are governed by the BSD license in LICENSE.test262.
* The toSpliced hole case omits the source test's inherited Array.prototype element because CodeMode does not expose
* prototype mutation; it retains the source test's hole-densification assertions.
*/
import { describe, expect, test } from "bun:test"
import { Effect } from "effect"
@ -227,6 +234,31 @@ const cases = [
code: `const input = ["first", "second", "third"]; const removed = input.splice(1); return [input, removed]`,
expected: [["first"], ["second", "third"]],
},
{
path: "test/built-ins/Array/prototype/toSpliced/immutable.js",
code: `const input = [2, 0, 1]; const inserted = input.toSpliced(0, 0, -1); const replaced = input.toSpliced(0, 1, -1); return [input, inserted, replaced, inserted !== input, replaced !== input]`,
expected: [[2, 0, 1], [-1, 2, 0, 1], [-1, 0, 1], true, true],
},
{
path: "test/built-ins/Array/prototype/toSpliced/start-and-deleteCount-missing.js",
code: `const input = ["first", "second", "third"]; const result = input.toSpliced(); return [result, result !== input]`,
expected: [["first", "second", "third"], true],
},
{
path: "test/built-ins/Array/prototype/toSpliced/start-undefined-and-deleteCount-missing.js",
code: `return ["first", "second", "third"].toSpliced(undefined)`,
expected: [],
},
{
path: "test/built-ins/Array/prototype/toSpliced/start-and-deleteCount-undefineds.js",
code: `const input = ["first", "second", "third"]; const result = input.toSpliced(undefined, undefined); return [result, result !== input]`,
expected: [["first", "second", "third"], true],
},
{
path: "test/built-ins/Array/prototype/toSpliced/holes-not-preserved.js",
code: `const input = [0, , 2, , 4]; const result = input.toSpliced(0, 0, -1); return [result, 2 in result, 4 in result]`,
expected: [[-1, 0, null, 2, null, 4], true, true],
},
{
path: "test/built-ins/Array/prototype/fill/fill-values-custom-start-and-end.js",
code: `const input = [0, 0, 0, 0, 0]; input.fill(8, -3, 4); const sparse = []; sparse[4] = 0; sparse.fill(8, 1, 3); return [[0, 0, 0].fill(8, 1, 2), input, [0, 0, 0, 0, 0].fill(8, -2, -1), [0, 0, 0, 0, 0].fill(8, -1, -3), [0 in sparse, sparse[1], sparse[2], 3 in sparse, sparse[4]]]`,