Something that just pop-out of my mind is handing over just a instance to wish we can append the data into... May not be the right thing to do...

var FormData = require('form-data')
new Response(...).formData(new FormData)

One thing i don't like so much about form-data today is that's not fully implemented. Lacks many feature of reading and manipulate the form. Without this it would be no point in even implementing body.formData since you would not have any way of changing/reading it... But hopefully they will resolve this issue: form-data/form-data#124 someday - kind of lost hope since it have taken them a long time now...

This part may not be relevant but i feel like sharing something i have built

I did implement a better fully spec'ed FormData polyfill here. But it was targeted for browser (not for node - since it depends on Blob & File)

Mine also follows the way chrome dose it. A bit more then others i have seen.
for instance:

Closing a blob should behave the same

blob = new Blob(["abc"])
fd.append('field', blob) // also handle the filename correctly depending on if it's a blob or a file or 3th argument
blob.close()

// getting a field with a blob should always return a new instance of File

a = fd.get('field') // File
b = fd.get('field') // File
a === b // false

Uh oh!

Implement body.formData #199

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