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fix(jsdom): fix Request with Blob body on jsdom 28+ #11295

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Merged
hi-ogawa merged 1 commit into from
Sep 17, 2026
+10 −2
Merged

fix(jsdom): fix Request with Blob body on jsdom 28+ #11295

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5 changes: 3 additions & 2 deletions packages/vitest/src/integrations/env/jsdom.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -321,8 +321,9 @@ function createCompatUtils(window: DOMWindow): CompatUtils {
return nodeFormData
},
makeCompatBlob(blob: Blob) {
const buffer = (blob as any)[implSymbol]._buffer
return new NodeBlob_([buffer], { type: blob.type })
const impl = (blob as any)[implSymbol]
// jsdom 28 renamed `_buffer` to `_bytes`
return new NodeBlob_([impl._bytes ?? impl._buffer], { type: blob.type })
},
}
return utils
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7 changes: 7 additions & 0 deletions test/unit/test/environments/jsdom.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,13 @@ describe('FormData', () => {

expect(retrievedBlob).toBeInstanceOf(File)
})

test('keeps Blob bytes when used as a Request body', async () => {
const blob = new Blob(['hello world'], { type: 'text/plain' })
const request = new Request('http://localhost/', { method: 'POST', body: blob })

expect(await request.text()).toBe('hello world')
})
})

test('DOM APIs accept AbortController', () => {
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