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fix(zod-validator): improve type inference for partial schemas #1724

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fix(zod-validator): improve type inference for partial schemas #1724

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a534a69
fix(zod-validator): improve type inference for partial schemas
Jan 30, 2026
be82f3b
chore: add changeset for zod-validator type fix
Jan 30, 2026
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5 changes: 5 additions & 0 deletions .changeset/green-jeans-rhyme.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@hono/zod-validator": patch
---

Fix Hono RPC type inference when using zValidator with partial schemas.
10 changes: 3 additions & 7 deletions packages/zod-validator/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@
c: Context<E, P>
) => Response | void | TypedResponse<O> | Promise<Response | void | TypedResponse<O>>

type HasUndefined<T> = undefined extends T ? true : false

Check failure on line 34 in packages/zod-validator/src/index.ts

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'HasUndefined' is declared but never used.

type ExtractValidationResponse<VF> = VF extends (value: any, c: any) => infer R
? R extends Promise<infer PR>
Expand All @@ -52,13 +52,9 @@
: never

type DefaultInput<Target extends keyof ValidationTargets, In, Out> = {
in: HasUndefined<In> extends true
? {
[K in Target]?: [In] extends [ValidationTargets[K]] ? In : InferInput<In, K>
}
: {
[K in Target]: [In] extends [ValidationTargets[K]] ? In : InferInput<In, K>
}
in: {
[K in Target]: [In] extends [ValidationTargets[K]] ? In : InferInput<In, K>
}
out: { [K in Target]: Out }
}

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