Please add TypeScript support for `.extend()` method in the z.Schema type

[ArsenBatyuchok]

I find it very useful to add my types for Zod schemas, so that if I change the type, TypeScript helps me in highlighting the errors in my broken schemas. But as soon as I assign any schema z.Schema<MyType>, I can no longer extend this schema. Here's a detailed example:

1. Without z.Schema<MyType> specification:

const mySchema = z.object({ ... });
const anotherSchema = mySchema.extend({ ... });

Works just fine, but no highlights if I have my types mismatched with the schema.

2. With z.Schema<MyType> specification:

const mySchema: z.Schema<MyType> = z.object({ ... });
const anotherSchema = mySchema.extend({ ... });

Here, I have my type definitions connected to Zod schemas, but I can no longer safely extend from mySchema (by safely, I mean type-safety, if I put @ts-ignore, it works just as expected).

Please suggest a workaround if any exists or add a type support for extend method in Schema type definition. Thanks!

[UNDERCOVERj]

can't agree more，I asked the question too。https://github.com/colinhacks/zod/issues/1271

[CoolColdUK]

You can do this using const anotherSchema:z.Schema<AnotherType> = mySchema.and(z.object({ ... }));

[Profesor08]

Also for z.ZodType

[stale[bot]]

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