I propose to add a type for the Buffer file

[deniszhigalov]

I pass Buffer to Upload and it works for me, but I use typescript and it tells me that the type cannot be Buffer. If Upload takes Buffer type please fix it. Thank you for understanding.

[Acconut]

I agree, we should also cover the Buffer type and not only Blob from the browser:

tus-js-client/lib/index.d.ts

Line 9 in 1db985a

constructor(file: File | Blob | Pick<ReadableStreamDefaultReader, 'read'>, options: UploadOptions)

Would you be willing to open a PR for this?