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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381/* * Portions adapted from Test262 at revision 250f204f23a9249ff204be2baec29600faae7b75: * - test/built-ins/Array/prototype/map/15.4.4.19-8-1.js * - test/built-ins/Array/prototype/map/15.4.4.19-8-2.js * - test/built-ins/Array/prototype/map/15.4.4.19-8-b-1.js * - test/built-ins/Array/prototype/filter/15.4.4.20-9-1.js * - test/built-ins/Array/prototype/filter/15.4.4.20-9-2.js * - test/built-ins/Array/prototype/filter/15.4.4.20-9-b-1.js * - test/built-ins/Array/prototype/find/predicate-call-parameters.js * - test/built-ins/Array/prototype/find/predicate-not-called-on-empty-array.js * - test/built-ins/Array/prototype/find/return-found-value-predicate-result-is-true.js * - test/built-ins/Array/prototype/find/return-undefined-if-predicate-returns-false-value.js * - test/built-ins/Array/prototype/findIndex/predicate-call-parameters.js * - test/built-ins/Array/prototype/findIndex/return-index-predicate-result-is-true.js * - test/built-ins/Array/prototype/findIndex/return-negative-one-if-predicate-returns-false-value.js * - test/built-ins/Array/prototype/findLast/predicate-call-parameters.js * - test/built-ins/Array/prototype/findLast/return-found-value-predicate-result-is-true.js * - test/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js * - test/built-ins/Array/prototype/findLastIndex/predicate-call-parameters.js * - test/built-ins/Array/prototype/findLastIndex/return-index-predicate-result-is-true.js * - test/built-ins/Array/prototype/findLastIndex/return-negative-one-if-predicate-returns-false-value.js * - test/built-ins/Array/prototype/some/15.4.4.17-7-1.js * - test/built-ins/Array/prototype/some/15.4.4.17-8-1.js * - test/built-ins/Array/prototype/every/15.4.4.16-7-1.js * - test/built-ins/Array/prototype/every/15.4.4.16-8-1.js * - test/built-ins/Array/prototype/forEach/15.4.4.18-7-1.js * - test/built-ins/Array/prototype/forEach/15.4.4.18-7-2.js * - test/built-ins/Array/prototype/reduce/15.4.4.21-9-5.js * - test/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-20.js * - test/built-ins/Array/prototype/reduce/15.4.4.21-9-1.js * - test/built-ins/Array/prototype/reduce/15.4.4.21-10-1.js * - test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-5.js * - test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-c-ii-20.js * - test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-1.js * - test/built-ins/Array/prototype/reduceRight/15.4.4.22-10-1.js * - test/built-ins/Array/prototype/flatMap/depth-always-one.js * - test/built-ins/Array/prototype/flatMap/mapperfunction-throws.js * - test/built-ins/Array/prototype/sort/S15.4.4.11_A1.1_T1.js * - test/built-ins/Array/prototype/sort/S15.4.4.11_A2.1_T1.js * - test/built-ins/Array/prototype/sort/stability-5-elements.js * - test/built-ins/Array/prototype/toSorted/comparefn-controls-sort.js * - test/built-ins/Array/prototype/toSorted/comparefn-default.js * - test/built-ins/Array/prototype/toSorted/immutable.js * - test/built-ins/Array/prototype/toSorted/zero-or-one-element.js * * Copyright (C) 2015 the V8 project authors. All rights reserved. * Copyright (C) 2018 Mathias Bynens. All rights reserved. * Copyright (C) 2018 Shilpi Jain and Michael Ficarra. All rights reserved. * Copyright (C) 2021 Igalia, S.L. All rights reserved. * Copyright (C) 2021 Microsoft. All rights reserved. * Copyright (C) 2025 Google. All rights reserved. * Copyright (C) 2026 Garham Lee. All rights reserved. * Copyright (c) 2012 Ecma International. All rights reserved. * Copyright 2009 the Sputnik authors. All rights reserved. * Test262 portions are governed by the BSD license in LICENSE.test262. */import { describe, expect, test } from "bun:test"import { Effect } from "effect"import { CodeMode } from "../src/index.js"
const value = async (code: string) => { const result = await Effect.runPromise(CodeMode.execute({ code, tools: {} })) if (!result.ok) throw new Error(`expected success, got ${result.error.kind}: ${result.error.message}`) return result.value}
const cases = [ { path: "test/built-ins/Array/prototype/map/15.4.4.19-8-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = 5; const result = input.map((value) => { input[2] = 3; input[5] = 6; return 1 }); return [result.length, result[5] === undefined]`, expected: [5, true], }, { path: "test/built-ins/Array/prototype/map/15.4.4.19-8-2.js", code: `const input = [1, 2, 3, 4, 5]; const result = input.map((value) => { input[4] = -1; return value > 0 ? 1 : 0 }); return [result.length, result[4]]`, expected: [5, 0], }, { path: "test/built-ins/Array/prototype/map/15.4.4.19-8-b-1.js", code: `const input = []; input[10] = 0; input.pop(); input[1] = undefined; let calls = 0; const result = input.map(() => { calls += 1; return 1 }); return [result.length, calls, 0 in result, 1 in result]`, expected: [10, 1, false, true], }, { path: "test/built-ins/Array/prototype/filter/15.4.4.20-9-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = 5; const result = input.filter(() => { input[2] = 3; input[5] = 6; return true }); return result`, expected: [1, 2, 3, 4, 5], }, { path: "test/built-ins/Array/prototype/filter/15.4.4.20-9-2.js", code: `const input = [1, 2, 3, 4, 5]; return input.filter((value) => { input[2] = -1; input[4] = -1; return value > 0 })`, expected: [1, 2, 4], }, { path: "test/built-ins/Array/prototype/filter/15.4.4.20-9-b-1.js", code: `const input = []; input[9] = 0; input.pop(); input[1] = undefined; let calls = 0; const result = input.filter(() => { calls += 1; return false }); return [result, calls]`, expected: [[], 1], }, { path: "test/built-ins/Array/prototype/find/predicate-call-parameters.js", code: `const input = [10, 20]; const seen = []; input.find((value, index, receiver) => { seen.push([value, index, receiver === input]); return false }); return seen`, expected: [ [10, 0, true], [20, 1, true], ], }, { path: "test/built-ins/Array/prototype/find/return-found-value-predicate-result-is-true.js", code: `return [1, 2, 3].find((value) => value > 1)`, expected: 2, }, { path: "test/built-ins/Array/prototype/find/return-undefined-if-predicate-returns-false-value.js", code: `return [1, 2, 3].find((value) => value > 4) === undefined`, expected: true, }, { path: "test/built-ins/Array/prototype/find/predicate-not-called-on-empty-array.js", code: `let calls = 0; const result = [].find(() => { calls += 1; return true }); return [result === undefined, calls]`, expected: [true, 0], }, { path: "test/built-ins/Array/prototype/findIndex/predicate-call-parameters.js", code: `const input = [10, 20]; const seen = []; input.findIndex((value, index, receiver) => { seen.push([value, index, receiver === input]); return false }); return seen`, expected: [ [10, 0, true], [20, 1, true], ], }, { path: "test/built-ins/Array/prototype/findIndex/return-index-predicate-result-is-true.js", code: `return [1, 2, 3].findIndex((value) => value > 1)`, expected: 1, }, { path: "test/built-ins/Array/prototype/findIndex/return-negative-one-if-predicate-returns-false-value.js", code: `return [1, 2, 3].findIndex((value) => value > 4)`, expected: -1, }, { path: "test/built-ins/Array/prototype/findLast/predicate-call-parameters.js", code: `const input = [10, 20]; const seen = []; input.findLast((value, index, receiver) => { seen.push([value, index, receiver === input]); return false }); return seen`, expected: [ [20, 1, true], [10, 0, true], ], }, { path: "test/built-ins/Array/prototype/findLast/return-found-value-predicate-result-is-true.js", code: `return [1, 2, 3].findLast((value) => value < 3)`, expected: 2, }, { path: "test/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js", code: `return [1, 2, 3].findLast((value) => value > 4) === undefined`, expected: true, }, { path: "test/built-ins/Array/prototype/findLastIndex/predicate-call-parameters.js", code: `const input = [10, 20]; const seen = []; input.findLastIndex((value, index, receiver) => { seen.push([value, index, receiver === input]); return false }); return seen`, expected: [ [20, 1, true], [10, 0, true], ], }, { path: "test/built-ins/Array/prototype/findLastIndex/return-index-predicate-result-is-true.js", code: `return [1, 2, 3].findLastIndex((value) => value < 3)`, expected: 1, }, { path: "test/built-ins/Array/prototype/findLastIndex/return-negative-one-if-predicate-returns-false-value.js", code: `return [1, 2, 3].findLastIndex((value) => value > 4)`, expected: -1, }, { path: "test/built-ins/Array/prototype/some/15.4.4.17-7-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = 5; const seen = []; const result = input.some((value) => { input[2] = 3; seen.push(value); return false }); return [result, seen.includes(3)]`, expected: [false, true], }, { path: "test/built-ins/Array/prototype/some/15.4.4.17-8-1.js", code: `return [].some(() => true)`, expected: false, }, { path: "test/built-ins/Array/prototype/every/15.4.4.16-7-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = 5; const seen = []; const result = input.every((value) => { input[2] = 3; seen.push(value); return true }); return [result, seen.includes(3)]`, expected: [true, true], }, { path: "test/built-ins/Array/prototype/every/15.4.4.16-8-1.js", code: `return [].every(() => false)`, expected: true, }, { path: "test/built-ins/Array/prototype/forEach/15.4.4.18-7-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = 5; let calls = 0; input.forEach(() => { calls += 1; input[2] = 3; input[5] = 6 }); return calls`, expected: 5, }, { path: "test/built-ins/Array/prototype/forEach/15.4.4.18-7-2.js", code: `const input = [1, 2, 3]; const seen = []; input.forEach((value, index) => { seen.push(value); if (index === 0) input.pop() }); return seen`, expected: [1, 2], }, { path: "test/built-ins/Array/prototype/reduce/15.4.4.21-9-1.js", code: `const input = [1, 2]; input[3] = 4; input[4] = "5"; return input.reduce((accumulator, value) => { input[2] = 3; input[5] = 6; return accumulator + value })`, expected: "105", }, { path: "test/built-ins/Array/prototype/reduce/15.4.4.21-9-5.js", code: `let calls = 0; const result = [1].reduce(() => { calls += 1; return 2 }); return [result, calls]`, expected: [1, 0], }, { path: "test/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-20.js", code: `let accessed = false; const result = [11].reduce((previous) => { accessed = true; return previous === undefined }, undefined); return [result, accessed]`, expected: [true, true], }, { path: "test/built-ins/Array/prototype/reduce/15.4.4.21-10-1.js", code: `const input = [1, 2, 3, 4, 5]; input.reduce(() => 1); return input`, expected: [1, 2, 3, 4, 5], }, { path: "test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-1.js", code: `const input = ["1", 2]; input[3] = 4; input[4] = "5"; return input.reduceRight((accumulator, value) => { input[2] = 3; input[5] = 6; return accumulator + value })`, expected: "54321", }, { path: "test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-5.js", code: `let calls = 0; const result = [1].reduceRight(() => { calls += 1; return 2 }); return [result, calls]`, expected: [1, 0], }, { path: "test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-c-ii-20.js", code: `let accessed = false; const result = [11].reduceRight((previous) => { accessed = true; return previous === undefined }, undefined); return [result, accessed]`, expected: [true, true], }, { path: "test/built-ins/Array/prototype/reduceRight/15.4.4.22-10-1.js", code: `const input = [1, 2, 3, 4, 5]; input.reduceRight(() => 1); return input`, expected: [1, 2, 3, 4, 5], }, { path: "test/built-ins/Array/prototype/flatMap/depth-always-one.js", code: `return [1, 2, 3].flatMap((value) => [[value * 2]])`, expected: [[2], [4], [6]], }, { path: "test/built-ins/Array/prototype/flatMap/mapperfunction-throws.js", code: `try { [1, 2].flatMap(() => { throw "stop" }) } catch (error) { return error === "stop" } return false`, expected: true, }, { path: "test/built-ins/Array/prototype/sort/S15.4.4.11_A1.1_T1.js", code: `const input = []; input[2] = 0; input.pop(); input.sort(); return [input.length, input[0] === undefined, input[1] === undefined]`, expected: [2, true, true], }, { path: "test/built-ins/Array/prototype/sort/S15.4.4.11_A2.1_T1.js", code: `return ["z", "y", "x", "w", "v", "u", "t", "s", "r", "q", "p", "o", "n", "M", "L", "K", "J", "I", "H", "G", "F", "E", "D", "C", "B", "A"].sort()`, expected: [ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", ], }, { path: "test/built-ins/Array/prototype/sort/stability-5-elements.js", code: `const input = [{ n: "A", r: 2 }, { n: "B", r: 3 }, { n: "C", r: 2 }, { n: "D", r: 3 }, { n: "E", r: 3 }]; return input.sort((left, right) => right.r - left.r).map((item) => item.n).join("")`, expected: "BDEAC", }, { path: "test/built-ins/Array/prototype/toSorted/comparefn-controls-sort.js", code: `const mixed = [333, 33, 3, 222, 22, 2, 111, 11, 1]; return [[1, 2, 3, 4].toSorted((a, b) => a - b), [4, 3, 2, 1].toSorted((a, b) => a - b), mixed.toSorted((a, b) => a - b), [1, 2, 3, 4].toSorted((a, b) => b - a), [4, 3, 2, 1].toSorted((a, b) => b - a), mixed.toSorted((a, b) => b - a)]`, expected: [ [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 11, 22, 33, 111, 222, 333], [4, 3, 2, 1], [4, 3, 2, 1], [333, 222, 111, 33, 22, 11, 3, 2, 1], ], }, { path: "test/built-ins/Array/prototype/toSorted/comparefn-default.js", code: `return [[1, 2, 3, 4].toSorted(), [4, 3, 2, 1].toSorted(), ["a", 2, 1, "z"].toSorted(), [333, 33, 3, 222, 22, 2, 111, 11, 1].toSorted()]`, expected: [ [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, "a", "z"], [1, 11, 111, 2, 22, 222, 3, 33, 333], ], }, { path: "test/built-ins/Array/prototype/toSorted/immutable.js", code: `const input = [2, 0, 1]; const result = input.toSorted(); return [input, result !== input]`, expected: [[2, 0, 1], true], }, { path: "test/built-ins/Array/prototype/toSorted/zero-or-one-element.js", code: `const zero = []; const one = [1]; const zeroResult = zero.toSorted(); const oneResult = one.toSorted(); return [zeroResult, oneResult, zeroResult !== zero, oneResult !== one]`, expected: [[], [1], true, true], },] as const
describe("Test262 Array callback adaptations", () => { for (const item of cases) { test(item.path, async () => { expect(await value(item.code)).toEqual(item.expected) }) }})
describe("Array callback regressions", () => { test("reduce and reduceRight find the first present element", async () => { expect( await value(` const left = [] left[2] = 3 const right = [] right[0] = 4 right[3] = 1 right.pop() return [left.reduce((a, b) => a + b), right.reduceRight((a, b) => a + b)] `), ).toEqual([3, 4]) })
test("reduce and reduceRight reject arrays containing only holes", async () => { expect( await value(` const values = [] values[2] = 1 values.pop() let left let right try { values.reduce((a, b) => a + b) } catch (error) { left = error.name } try { values.reduceRight((a, b) => a + b) } catch (error) { right = error.name } return [left, right] `), ).toEqual(["TypeError", "TypeError"]) })
test("findLast returns the value observed before predicate mutation", async () => { expect( await value(` const values = [1] return values.findLast((item, index, array) => { array[index] = 2 return true }) `), ).toBe(1) })})