Describe the issue

Passing Uint8Array or Buffer to postForm results in "source.on is not a function" exception.

Example Code

const data = Uint8Array.from([1, 2, 3])
axios.postForm('http://some.url', { data })

// or

const data = Uint8Array.from([1, 2, 3])
axios.postForm('http://some.url', { data: Buffer.from(data) })

Expected behavior, if applicable

axios should POST a field "data" with the content of the Uint8Array / Buffer

Environment

• Axios Version 0.27.2
• Node.js Version 18.2.0
• OS: Windows 11

Additional context/Screenshots

Code is compiled from TypeScript using typescript 4.6.4 and a tsconfig.json that extends @tsconfig/node18/tsconfig.json

I am trying to upload the PDF output of puppeteer.

What am I doing wrong?