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Add .exactOptional()#5589

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colinhacks merged 2 commits intomainfrom
exact-optional
Dec 31, 2025
Merged

Add .exactOptional()#5589
colinhacks merged 2 commits intomainfrom
exact-optional

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@colinhacks colinhacks commented Dec 31, 2025 •
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Closes #5495 #635 #1510

I don't love this API but it's the best we've got at the moment. This is 100% opt-in. The classic .optional() will continue behaving as it always has.

const A = z.object({
  a: z.string().optional(),
  b: z.string().exactOptional(),
});

type A = z.infer<typeof A>;
// => {
//   a?: string | undefined;
//   b?: string;
// }

A.parse({}); // ✅
A.parse({ a: undefined }); // ✅
A.parse({ b: undefined }); // ❌

Trying to enable exact optionality via some kind of global config is too kludgey and footgunny, so it needed to be an explicit API.

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Blocking issue: the non-JIT code path doesn't implement the same error suppression logic as the JIT path, which will cause test failures and incorrect runtime behavior when jitless mode is enabled.

Pullfrog  ｜ Fix all ➔ ｜ Fix 👍s ➔ ｜ View workflow run ｜ pullfrog.com ｜ 𝕏

Repository owner deleted a comment from pullfrog bot Dec 31, 2025
@colinhacks colinhacks merged commit a7b1d18 into main Dec 31, 2025
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@colinhacks colinhacks deleted the exact-optional branch December 31, 2025 04:25
This was referenced Dec 31, 2025
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@pullfrog pullfrog bot mentioned this pull request Jan 22, 2026
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Bug: Cannot type { key?: string }, can only do { key?: string | undefined }

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