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feat(codemode): math parity (#35609)

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Aiden Cline 2026-07-06 16:47:17 -05:00 • committed by GitHub
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6 changed files with 172 additions and 18 deletions
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79
packages/codemode/test/stdlib.test.ts
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@ -586,6 +586,85 @@ describe("Set", () => {
})
describe("stdlib integration", () => {
test("Object values and entries accept arrays", async () => {
expect(await value(`return [Object.values(["a", "b"]), Object.entries(["a", "b"])]`)).toEqual([
["a", "b"],
[
["0", "a"],
["1", "b"],
],
])
expect(await value(`const match = /a/.exec("ba"); return [Object.values(match), Object.entries(match)]`)).toEqual([
["a", 1],
[
["0", "a"],
["index", 1],
],
])
expect(await value(`return Object.keys(Object.values({ match: /a/.exec("ba") })[0])`)).toEqual(["0", "index"])
})
test("Object.fromEntries accepts every supported entry collection", async () => {
expect(
await value(`
return [
Object.fromEntries([["a", 1]]),
Object.fromEntries(new Map([["b", 2]])),
Object.fromEntries(new Set([["c", 3]])),
Object.fromEntries(new URLSearchParams("d=4")),
Object.fromEntries([{ 0: "e", 1: 5 }]),
Object.fromEntries(new Set([[{}, 6], [new Date(0), 7], [null, 8], [undefined, 9]])),
]
`),
).toEqual([
{ a: 1 },
{ b: 2 },
{ c: 3 },
{ d: "4" },
{ e: 5 },
{ "[object Object]": 6, "1970-01-01T00:00:00.000Z": 7, null: 8, undefined: 9 },
])
expect(await value(`try { Object.fromEntries(new Set([Math.max])); return false } catch { return true }`)).toBe(
true,
)
expect(
await value(
`try { Object.fromEntries(new Map([["fn", Math.max]])); return false } catch { return true }`,
),
).toBe(true)
})
test("deterministic Math methods match the host runtime", async () => {
const result = await value(`
return [
Math.acos(0.5), Math.acosh(2), Math.asin(0.5), Math.asinh(2), Math.atan(1), Math.atan2(1, 2), Math.atanh(0.5),
Math.cos(0.5), Math.cosh(0.5), Math.sin(0.5), Math.sinh(0.5), Math.tan(0.5), Math.tanh(0.5),
Math.log1p(0.5), Math.expm1(0.5), Math.f16round(1.337), Math.fround(1.337), Math.clz32(1), Math.imul(2, 3),
]
`)
expect(result).toEqual([
Math.acos(0.5),
Math.acosh(2),
Math.asin(0.5),
Math.asinh(2),
Math.atan(1),
Math.atan2(1, 2),
Math.atanh(0.5),
Math.cos(0.5),
Math.cosh(0.5),
Math.sin(0.5),
Math.sinh(0.5),
Math.tan(0.5),
Math.tanh(0.5),
Math.log1p(0.5),
Math.expm1(0.5),
Math.f16round(1.337),
Math.fround(1.337),
Math.clz32(1),
Math.imul(2, 3),
])
})
test("Object.assign mutates and returns its target", async () => {
expect(
await value(`