feat(hono/context): add buffer returns (#3813)

* feat(hono/context): add buffer returns

* test: add bun & deno tests for buffers

* fix(hono/context): buffer -> uint8array for web standards

---------

Co-authored-by: askorupskyy <[email protected]>

runtime-tests/bun/index.test.tsx

@@ -438,3 +438,15 @@ describe('streaming', () => {
     })
   })
 })
+
+describe('Buffers', () => {
+  const app = new Hono().get('/', async (c) => {
+    return c.body(Buffer.from('hello'))
+  })
+
+  it('should allow returning buffers', async () => {
+    const res = await app.request(new Request('http://localhost/'))
+    expect(res.status).toBe(200)
+    expect(await res.text()).toBe('hello')
+  })
+})

runtime-tests/deno/hono.test.ts

@@ -1,4 +1,6 @@
 import { assertEquals } from '@std/assert'
+import { Buffer } from 'node:buffer'
+
 import { Context } from '../../src/context.ts'
 import { env, getRuntimeKey } from '../../src/helper/adapter/index.ts'
 import { Hono } from '../../src/hono.ts'
@@ -32,3 +34,13 @@ Deno.test('environment variables', () => {
   const { NAME } = env<{ NAME: string }>(c)
   assertEquals(NAME, 'Deno')
 })
+
+Deno.test('Buffers', async () => {
+  const app = new Hono().get('/', async (c) => {
+    return c.body(Buffer.from('hello'))
+  })
+
+  const res = await app.request('/')
+  assertEquals(res.status, 200)
+  assertEquals(await res.text(), 'hello')
+})

runtime-tests/node/index.test.ts

@@ -247,3 +247,27 @@ describe('compress', async () => {
     expect(res.text).toBe(cssContent)
   })
 })
+
+describe('Buffers', () => {
+  const app = new Hono()
+    .get('/', async (c) => {
+      return c.body(Buffer.from('hello'))
+    })
+    .get('/uint8array', async (c) => {
+      return c.body(Uint8Array.from('hello'.split(''), (c) => c.charCodeAt(0)))
+    })
+
+  const server = createAdaptorServer(app)
+
+  it('should allow returning buffers', async () => {
+    const res = await request(server).get('/')
+    expect(res.status).toBe(200)
+    expect(res.text).toBe('hello')
+  })
+
+  it('should allow returning uint8array as well', async () => {
+    const res = await request(server).get('/uint8array')
+    expect(res.status).toBe(200)
+    expect(res.text).toBe('hello')
+  })
+})

src/context.ts

@@ -27,9 +27,9 @@ type HeaderRecord =
   | Record<string, string | string[]>
 
 /**
- * Data type can be a string, ArrayBuffer, or ReadableStream.
+ * Data type can be a string, ArrayBuffer, Uint8Array (buffer), or ReadableStream.
  */
-export type Data = string | ArrayBuffer | ReadableStream
+export type Data = string | ArrayBuffer | ReadableStream | Uint8Array
 
 /**
  * Interface for the execution context in a web worker or similar environment.