-
|
When creating a new schema using object spread with .shape, Zod does not validate the fields inherited from the spread schema.
❌ Actual Behavior: This works as expected in zod/v4, but fails silently in zod/v4-mini — possibly due to excluded type metadata or shape internals. |
Beta Was this translation helpful? Give feedback.
Replies: 2 comments 2 replies
-
|
Hi @I-am-tk! I'm Dosu and I’m helping the zod team. This is a known limitation of To combine schemas in import { z } from "zod/v4-mini";
const Dog = z.object({
name: z.string(),
age: z.optional(z.number()),
});
const DogWithBreed = z.extend(Dog, {
breed: z.string(),
});
// This will now correctly fail if "name" is missing
console.log(
DogWithBreed.safeParse({
age: 3,
breed: "Labrador Retriever",
}),
);Or, if you need to combine more complex schemas, Let me know if this solves your problem or if you have more questions! If this answers your question, please feel free to close the issue. To reply, just mention @dosu. How did I do? Good | Irrelevant | Incorrect | Verbose | Hallucination | Report 🐛 | Other |
Beta Was this translation helpful? Give feedback.
-
|
@dosu Thanks for the clarification! Just to confirm — the Zod v4 documentation currently states:
So I was expecting the spread + shape approach to work correctly in both versions. |
Beta Was this translation helpful? Give feedback.
-
|
You're right—the Zod v4 documentation does recommend the spread + shape approach and implies it works in both Zod and Zod Mini. However, in practice, this only works reliably in classic Zod v4. In zod/v4-mini, the way shape metadata is handled internally means that spreading For zod/v4-mini, you should use the public API methods like Let me know if you have any more questions or if this clears things up! If you're satisfied, feel free to close the issue. To reply, just mention @dosu. How did I do? Good | Irrelevant | Incorrect | Verbose | Hallucination | Report 🐛 | Other |
Beta Was this translation helpful? Give feedback.
-
|
|
Beta Was this translation helpful? Give feedback.
Dog.shapeis undefined at runtime, despite being declared in the type declarations. This is a clear bug. Either it needs to be defined at runtime, or it needs to be removed from the type declarations. I’ve filed this as #4727.