Change XMLHttpRequest event trigger timing

src/polyfill/Blob.js

 import fs from '../fs.js'
 import getUUID from '../utils/uuid'
 import Log from '../utils/log.js'
+import EventTarget from './EventTarget'
 
 const log = new Log('Blob')
 const blobCacheDir = fs.dirs.DocumentDir + '/RNFetchBlob-blobs/'
  * A RNFetchBlob style Blob polyfill class, this is a Blob which compatible to
  * Response object attain fron RNFetchBlob.fetch.
  */
-export default class Blob {
+export default class Blob extends EventTarget {
 
   cacheName:string;
   type:string;

src/polyfill/File.js

 
 export default class File extends Blob {
 
-  constructor() {
-    super()
+  name : string = '';
+
+  constructor(data:any , cType:string) {
+    super(data, cType)
   }
 
 }

src/polyfill/XMLHttpRequest.js

     else if(typeof body === 'object') {
       body = JSON.stringify(body)
     }
+    else
+      body = body.toString()
 
     this._task = RNFetchBlob
                   .config({ auto: true, timeout : this._timeout })
   _headerReceived(e) {
     log.verbose('header received ', this._task.taskId, e)
     this.responseURL = this._url
-    this.upload.dispatchEvent('loadend')
-    this.dispatchEvent('load')
     if(e.state === "2") {
       this._responseHeaders = e.headers
       this._statusText = e.status
         break;
       }
       this.dispatchEvent('loadend')
+      this.dispatchEvent('load')
       this._dispatchReadStateChange(XMLHttpRequest.DONE)
     }
     this.clearEventListeners()

src/polyfill/index.js

 import ProgressEvent from './ProgressEvent'
 
 export default {
-  Blob, File, XMLHttpRequest, FormData, ProgressEvent
+  Blob, File, XMLHttpRequest, FormData, ProgressEvent, Event
 }