rn-fetch-blob/src/polyfill/index.js

import Blob from './Blob.js'
import File from './File.js'
import XMLHttpRequest from './XMLHttpRequest.js'
import FormData from './FormData.js'
import ProgressEvent from './ProgressEvent'
import Event from './Event'

export default {
  Blob, File, XMLHttpRequest, FormData, ProgressEvent, Event
}