fix(valibot-validator): Fix response query types on RPC (#914)

Fixes #899

* fix(valibot-validator): Fix query types on RPC

* Add changeset

* Remove valibot issue flatenning

* Add types test

.changeset/warm-plants-thank.md

@@ -0,0 +1,5 @@
+---
+'@hono/valibot-validator': patch
+---
+
+Fix request query types for valibot schemas

packages/valibot-validator/src/index.ts

@@ -1,4 +1,4 @@
-import type { Context, Env, Input as HonoInput, MiddlewareHandler, ValidationTargets } from 'hono'
+import type { Context, Env, Input, MiddlewareHandler, TypedResponse, ValidationTargets } from 'hono'
 import { validator } from 'hono/validator'
 import type {
   GenericSchema,
@@ -9,10 +9,18 @@ import type {
 } from 'valibot'
 import { safeParseAsync } from 'valibot'
 
-export type Hook<T extends GenericSchema | GenericSchemaAsync, E extends Env, P extends string> = (
-  result: SafeParseResult<T>,
+export type Hook<
+  T extends GenericSchema | GenericSchemaAsync,
+  E extends Env,
+  P extends string,
+  Target extends keyof ValidationTargets = keyof ValidationTargets,
+  O = {}
+> = (
+  result: SafeParseResult<T> & {
+    target: Target
+  },
   c: Context<E, P>
-) => Response | Promise<Response> | void | Promise<Response | void>
+) => Response | void | TypedResponse<O> | Promise<Response | void | TypedResponse<O>>
 
 type HasUndefined<T> = undefined extends T ? true : false
 
@@ -23,20 +31,16 @@ export const vValidator = <
   P extends string,
   In = InferInput<T>,
   Out = InferOutput<T>,
-  I extends HonoInput = {
+  I extends Input = {
     in: HasUndefined<In> extends true
       ? {
-          [K in Target]?: K extends 'json'
+          [K in Target]?: In extends ValidationTargets[K]
             ? In
-            : HasUndefined<keyof ValidationTargets[K]> extends true
-            ? { [K2 in keyof In]?: ValidationTargets[K][K2] }
-            : { [K2 in keyof In]: ValidationTargets[K][K2] }
+            : { [K2 in keyof In]?: ValidationTargets[K][K2] }
         }
       : {
-          [K in Target]: K extends 'json'
+          [K in Target]: In extends ValidationTargets[K]
             ? In
-            : HasUndefined<keyof ValidationTargets[K]> extends true
-            ? { [K2 in keyof In]?: ValidationTargets[K][K2] }
             : { [K2 in keyof In]: ValidationTargets[K][K2] }
         }
     out: { [K in Target]: Out }
@@ -45,23 +49,28 @@ export const vValidator = <
 >(
   target: Target,
   schema: T,
-  hook?: Hook<T, E, P>
+  hook?: Hook<T, E, P, Target>
 ): MiddlewareHandler<E, P, V> =>
   // @ts-expect-error not typed well
   validator(target, async (value, c) => {
     const result = await safeParseAsync(schema, value)
 
     if (hook) {
-      const hookResult = hook(result, c)
-      if (hookResult instanceof Response || hookResult instanceof Promise) {
+      const hookResult = await hook({ ...result, target }, c)
+      if (hookResult) {
+        if (hookResult instanceof Response) {
           return hookResult
         }
+
+        if ('response' in hookResult) {
+          return hookResult.response
+        }
+      }
     }
 
     if (!result.success) {
       return c.json(result, 400)
     }
 
-    const data = result.output as InferOutput<T>
-    return data
+    return result.output
   })

packages/valibot-validator/test/index.test.ts

@@ -324,3 +324,28 @@ describe('With Hook Async', () => {
     expect(res.status).toBe(400)
   })
 })
+
+describe('Test types', () => {
+  it('Should return correct types when validating a query', () => {
+    const app = new Hono()
+
+    const routes = app.post(
+      '/',
+      vValidator(
+        'query',
+        object({
+          foo: string(),
+        })
+      ),
+      (c) => {
+        return c.json(c.req.valid('query'))
+      }
+    )
+
+    type T = ExtractSchema<typeof routes>
+
+    type Actual = T['/']['$post']['input']['query']
+    type Expected = { foo: string }
+    type verify = Expect<Equal<Expected, Actual>>
+  })
+})