From aeba9ece778fb24953816fd3517858ff80de958f Mon Sep 17 00:00:00 2001
From: Yusuke Wada <yusuke@kamawada.com>
Date: Sun, 19 Jul 2026 08:02:09 +0900
Subject: [PATCH 1/3] fix(sse): emit retry feild when retry is `0` (#5135)

---
 src/helper/streaming/sse.test.tsx | 22 ++++++++++++++++++++++
 src/helper/streaming/sse.ts       |  7 ++++---
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/helper/streaming/sse.test.tsx b/src/helper/streaming/sse.test.tsx
index 8da7e81f31..75b2bd4319 100644
--- a/src/helper/streaming/sse.test.tsx
+++ b/src/helper/streaming/sse.test.tsx
@@ -132,6 +132,28 @@ describe('SSE Streaming helper', () => {
     expect(decodedValue).toContain(expectedRetryValue)
   })
 
+  it('Should accept retry: 0 and not skip it', async () => {
+    const res = streamSSE(c, async (stream) => {
+      await stream.writeSSE({
+        data: 'This is a test message',
+        retry: 0,
+      })
+    })
+
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(200)
+
+    if (!res.body) {
+      throw new Error('Body is null')
+    }
+    const reader = res.body.getReader()
+    const decoder = new TextDecoder()
+    const { value } = await reader.read()
+    const decodedValue = decoder.decode(value)
+
+    expect(decodedValue).toContain('retry: 0\n\n')
+  })
+
   it('Check stream Response if error occurred', async () => {
     const onError = vi.fn()
     const res = streamSSE(
diff --git a/src/helper/streaming/sse.ts b/src/helper/streaming/sse.ts
index 6edd93d564..2b161912fd 100644
--- a/src/helper/streaming/sse.ts
+++ b/src/helper/streaming/sse.ts
@@ -24,8 +24,9 @@ export class SSEStreamingApi extends StreamingApi {
       })
       .join('\n')
 
-    for (const key of ['event', 'id', 'retry'] as (keyof SSEMessage)[]) {
-      if (message[key] && /[\r\n]/.test(message[key] as string)) {
+    for (const key of ['event', 'id'] as const) {
+      const value = message[key]
+      if (value && /[\r\n]/.test(value)) {
         throw new Error(`${key} must not contain "\\r" or "\\n"`)
       }
     }
@@ -35,7 +36,7 @@ export class SSEStreamingApi extends StreamingApi {
         message.event && `event: ${message.event}`,
         dataLines,
         message.id && `id: ${message.id}`,
-        message.retry && `retry: ${message.retry}`,
+        message.retry !== undefined && `retry: ${message.retry}`,
       ]
         .filter(Boolean)
         .join('\n') + '\n\n'

From 64c613ab0f15526b0c0edb25ad0c2989eace2ea1 Mon Sep 17 00:00:00 2001
From: Yusuke Wada <yusuke@kamawada.com>
Date: Sun, 19 Jul 2026 08:10:28 +0900
Subject: [PATCH 2/3] test(validator): fix misspelled identifier in transform
 type test (#5136)

---
 src/validator/validator.test.ts | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/validator/validator.test.ts b/src/validator/validator.test.ts
index 5d467cbb35..16db114ac0 100644
--- a/src/validator/validator.test.ts
+++ b/src/validator/validator.test.ts
@@ -1357,15 +1357,15 @@ describe('Transform', () => {
         } as {
           page: number
           orderBy: 'asc' | 'desc'
-          ordreByWithdefault?: 'asc' | 'desc' | undefined
+          orderByWithdefault?: 'asc' | 'desc' | undefined
         }
       }),
       (c) => {
-        const { page, orderBy, ordreByWithdefault } = c.req.valid('query')
+        const { page, orderBy, orderByWithdefault } = c.req.valid('query')
         expectTypeOf(page).toEqualTypeOf<number>()
         expectTypeOf(orderBy).toEqualTypeOf<'asc' | 'desc'>()
-        expectTypeOf(ordreByWithdefault).toEqualTypeOf<'asc' | 'desc' | undefined>()
-        return c.json({ page, orderBy, ordreByWithdefault })
+        expectTypeOf(orderByWithdefault).toEqualTypeOf<'asc' | 'desc' | undefined>()
+        return c.json({ page, orderBy, orderByWithdefault })
       }
     )
 
@@ -1376,13 +1376,13 @@ describe('Transform', () => {
             query: {
               page: string | string[]
               orderBy: 'asc' | 'desc'
-              ordreByWithdefault?: 'asc' | 'desc' | undefined
+              orderByWithdefault?: 'asc' | 'desc' | undefined
             }
           }
           output: {
             page: number
             orderBy: 'asc' | 'desc'
-            ordreByWithdefault: 'asc' | 'desc' | undefined
+            orderByWithdefault: 'asc' | 'desc' | undefined
           }
           outputFormat: 'json'
           status: ContentfulStatusCode

From cadff88bba34153646c9b35f24d7cc0cb61be913 Mon Sep 17 00:00:00 2001
From: Yusuke Wada <yusuke@kamawada.com>
Date: Sun, 19 Jul 2026 08:15:00 +0900
Subject: [PATCH 3/3] 4.12.31

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 606f2db336..95df31ac58 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hono",
-  "version": "4.12.30",
+  "version": "4.12.31",
   "description": "Web framework built on Web Standards",
   "main": "dist/cjs/index.js",
   "type": "module",