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fix(codemode): align array callback behavior (#36584)

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Aiden Cline 2026-07-13 00:34:18 -05:00 • committed by GitHub
commit 828a4b3f15
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3 changed files with 77 additions and 22 deletions
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55
packages/codemode/test/array-callbacks-test262.test.ts
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@ -26,9 +26,11 @@
* - 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
@ -210,6 +212,11 @@ const cases = [
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`,
@ -225,6 +232,11 @@ const cases = [
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`,
@ -323,3 +335,46 @@ describe("Test262 Array callback adaptations", () => {
})
}
})
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)
})
})