feat(zod-validator): support coerce (#411)

* fix(zod-validator): support `coerce`

* changeset

* refactored

* make it as minor

Author: yusukebe

.changeset/eleven-birds-beg.md

@@ -0,0 +1,5 @@
+---
+'@hono/zod-validator': minor
+---
+
+feat: support coerce

packages/zod-validator/package.json

@@ -31,10 +31,10 @@
     "zod": "^3.19.1"
   },
   "devDependencies": {
-    "hono": "^3.11.7",
+    "hono": "^4.0.10",
     "jest": "^29.7.0",
     "rimraf": "^5.0.5",
     "typescript": "^5.3.3",
-    "zod": "3.19.1"
+    "zod": "^3.22.4"
   }
 }

packages/zod-validator/src/index.ts

@@ -1,4 +1,4 @@
-import type { Context, MiddlewareHandler, Env, ValidationTargets, TypedResponse } from 'hono'
+import type { Context, MiddlewareHandler, Env, ValidationTargets, TypedResponse, Input } from 'hono'
 import { validator } from 'hono/validator'
 import type { z, ZodSchema, ZodError } from 'zod'
 
@@ -14,20 +14,33 @@ export const zValidator = <
   Target extends keyof ValidationTargets,
   E extends Env,
   P extends string,
-  I = z.input<T>,
-  O = z.output<T>,
-  V extends {
-    in: HasUndefined<I> extends true ? { [K in Target]?: I } : { [K in Target]: I }
-    out: { [K in Target]: O }
-  } = {
-    in: HasUndefined<I> extends true ? { [K in Target]?: I } : { [K in Target]: I }
-    out: { [K in Target]: O }
-  }
+  In = z.input<T>,
+  Out = z.output<T>,
+  I extends Input = {
+    in: HasUndefined<In> extends true
+      ? {
+          [K in Target]?: K extends 'json'
+            ? In
+            : HasUndefined<keyof ValidationTargets[K]> extends true
+            ? { [K2 in keyof In]?: ValidationTargets[K][K2] }
+            : { [K2 in keyof In]: ValidationTargets[K][K2] }
+        }
+      : {
+          [K in Target]: K extends 'json'
+            ? 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 }
+  },
+  V extends I = I
 >(
   target: Target,
   schema: T,
   hook?: Hook<z.infer<T>, E, P>
 ): MiddlewareHandler<E, P, V> =>
+  // @ts-expect-error not typed well
   validator(target, async (value, c) => {
     const result = await schema.safeParseAsync(value)
 

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

@@ -28,7 +28,7 @@ describe('Basic', () => {
       const data = c.req.valid('json')
       const query = c.req.valid('query')
 
-      return c.jsonT({
+      return c.json({
         success: true,
         message: `${data.name} is ${data.age}`,
         queryName: query?.name,
@@ -48,7 +48,7 @@ describe('Basic', () => {
         } & {
           query?:
             | {
-                name?: string | undefined
+                name?: string | string[] | undefined
               }
             | undefined
         }
@@ -92,6 +92,9 @@ describe('Basic', () => {
         age: '20',
       }),
       method: 'POST',
+      headers: {
+        'content-type': 'application/json',
+      },
     })
     const res = await app.request(req)
     expect(res).not.toBeNull()
@@ -101,6 +104,47 @@ describe('Basic', () => {
   })
 })
 
+describe('coerce', () => {
+  const app = new Hono()
+
+  const querySchema = z.object({
+    page: z.coerce.number(),
+  })
+
+  const route = app.get('/page', zValidator('query', querySchema), (c) => {
+    const { page } = c.req.valid('query')
+    return c.json({ page })
+  })
+
+  type Actual = ExtractSchema<typeof route>
+  type Expected = {
+    '/page': {
+      $get: {
+        input: {
+          query: {
+            page: string | string[]
+          }
+        }
+        output: {
+          page: number
+        }
+      }
+    }
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  type verify = Expect<Equal<Expected, Actual>>
+
+  it('Should return 200 response', async () => {
+    const res = await app.request('/page?page=123')
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(200)
+    expect(await res.json()).toEqual({
+      page: 123,
+    })
+  })
+})
+
 describe('With Hook', () => {
   const app = new Hono()
 

yarn.lock

@@ -1748,11 +1748,11 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@hono/zod-validator@workspace:packages/zod-validator"
   dependencies:
-    hono: "npm:^3.11.7"
+    hono: "npm:^4.0.10"
     jest: "npm:^29.7.0"
     rimraf: "npm:^5.0.5"
     typescript: "npm:^5.3.3"
-    zod: "npm:3.19.1"
+    zod: "npm:^3.22.4"
   peerDependencies:
     hono: ">=3.9.0"
     zod: ^3.19.1
@@ -8917,6 +8917,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"hono@npm:^4.0.10":
+  version: 4.0.10
+  resolution: "hono@npm:4.0.10"
+  checksum: a68deed2a216dd956e6012a834312a09ffcf18a8e61b851ec6b168ad5cf13d9696f7fa3dce25286b4b2e92f6ea7102ece8f097f423ff385236f7b83c3a68032c
+  languageName: node
+  linkType: hard
+
 "hono@npm:^4.0.2":
   version: 4.0.2
   resolution: "hono@npm:4.0.2"
@@ -18216,13 +18223,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"zod@npm:3.19.1":
-  version: 3.19.1
-  resolution: "zod@npm:3.19.1"
-  checksum: e08197793f26916f8abea40687fc968b2de0471049b29b7ff25825a9f28ba24205d1c5b8ad26df17538b051928192f9ef8f9ef3132aece9cb56f0830a7450c26
-  languageName: node
-  linkType: hard
-
 "zod@npm:^3.20.2, zod@npm:^3.20.6, zod@npm:^3.22.1, zod@npm:^3.22.4":
   version: 3.22.4
   resolution: "zod@npm:3.22.4"