fix(utils/body): support multiple Files

.github/workflows/ci.yml

@@ -11,6 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
       - uses: oven-sh/setup-bun@v1
         with:
           bun-version: '1.0.25'

deno_dist/utils/body.ts

@@ -70,14 +70,12 @@ function convertFormDataToBodyData<T extends BodyData = BodyData>(
 }
 
 const handleParsingAllValues = (form: BodyData, key: string, value: FormDataEntryValue): void => {
-  const formKey = form[key] as (string | File)[]
+  const formKey = form[key]
 
-  if (form[key] && Array.isArray(form[key])) {
-    formKey.push(value)
-  } else if (form[key]) {
-    const parsedKey = [...formKey].join('').replace(',', '')
-
-    form[key] = [parsedKey, value]
+  if (formKey && Array.isArray(formKey)) {
+    ;(form[key] as (string | File)[]).push(value)
+  } else if (formKey) {
+    form[key] = [formKey, value]
   } else {
     form[key] = value
   }

src/utils/body.test.ts

@@ -64,6 +64,24 @@ describe('Parse Body Util', () => {
     })
   })
 
+  it('should parse multiple values if values are `File`', async () => {
+    const file1 = new File(['foo'], 'file1', {
+      type: 'application/octet-stream',
+    })
+    const file2 = new File(['bar'], 'file2', {
+      type: 'application/octet-stream',
+    })
+    const data = new FormData()
+    data.append('file', file1)
+    data.append('file', file2)
+
+    const req = createRequest(FORM_URL, 'POST', data)
+
+    expect(await parseBody(req, { all: true })).toEqual({
+      file: [file1, file2],
+    })
+  })
+
   it('should parse multiple values if key ends with `[]`', async () => {
     const data = new FormData()
     data.append('file[]', 'aaa')

src/utils/body.ts

@@ -70,14 +70,12 @@ function convertFormDataToBodyData<T extends BodyData = BodyData>(
 }
 
 const handleParsingAllValues = (form: BodyData, key: string, value: FormDataEntryValue): void => {
-  const formKey = form[key] as (string | File)[]
+  const formKey = form[key]
 
-  if (form[key] && Array.isArray(form[key])) {
-    formKey.push(value)
-  } else if (form[key]) {
-    const parsedKey = [...formKey].join('').replace(',', '')
-
-    form[key] = [parsedKey, value]
+  if (formKey && Array.isArray(formKey)) {
+    ;(form[key] as (string | File)[]).push(value)
+  } else if (formKey) {
+    form[key] = [formKey, value]
   } else {
     form[key] = value
   }