8000 @zod/mini: extend and merge return plain object · Issue #4154 · colinhacks/zod · GitHub
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@zod/mini: extend and merge return plain object #4154

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aliechti opened this issue Apr 15, 2025 · 2 comments
Closed

@zod/mini: extend and merge return plain object #4154

aliechti opened this issue Apr 15, 2025 · 2 comments

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@aliechti
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In @zod/mini, both extend and merge lose schema type information and resolve to a plain object, breaking inference.

import * as z from "@zod/mini";

const Test = z.object({
  test: z.string(),
});

const Test2 = z.extend(Test, {
  test2: z.string(),
});

type Test2 = z.infer<typeof Test2>;

const test2 = {} as Test2;

console.log(test2.test);
console.log(test2.test2);

Errors:

Property 'test' does not exist on type 'object'.
Property 'test2' does not exist on type 'object'.

Playground Link

Workaround

Using .intersection() works but is not compatible with ZodMiniObject and introduces other type issues.

Expected

extend and merge should preserve the schema and allow proper type inference like in zod.
@dartess
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dartess commented Apr 23, 2025

looks like a duplicate of #4082

@colinhacks
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Owner

Fixed some time ago, upgrade to the latest betas. 👍

Note that you'll need to rewrite your v4 imports to "zod/v4" after upgrading; for more information, see #4364

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@colinhacks @aliechti @dartess
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