Cannot calculate proper length in a synchronous way (form-data)

[havenchyk]

I came across the issue

Error: Cannot calculate proper length in a synchronous way.

What I'm trying to do

 const fileName = 'somename'
 const form = new FormData()

console.log(`- Uploading ${fileName}`)

form.append('name', `${publicUrl}/assets/js/${fileName}`)
form.append('file', fs.createReadStream(filePath))

// form.getLengthSync = null - a known workaround, thanks @mcfedr

fetch(`url`, {
  method: 'POST',
  body: form
})

I know that it's might be a problem with FormData itself, but can we handle somehow this case?

[havenchyk]

I'm sorry, I just realized that isomorphic-fetch uses node-fetch :) should be handled there