fix(adapter): fix progress event emitting; (#6518)

lib/helpers/progressEventReducer.js

@@ -1,7 +1,8 @@
 import speedometer from "./speedometer.js";
 import throttle from "./throttle.js";
+import utils from "../utils.js";
 
-export default (listener, isDownloadStream, freq = 3) => {
+export const progressEventReducer = (listener, isDownloadStream, freq = 3) => {
   let bytesNotified = 0;
   const _speedometer = speedometer(50, 250);
 
@@ -22,11 +23,22 @@ export default (listener, isDownloadStream, freq = 3) => {
       rate: rate ? rate : undefined,
       estimated: rate && total && inRange ? (total - loaded) / rate : undefined,
       event: e,
-      lengthComputable: total != null
+      lengthComputable: total != null,
+      [isDownloadStream ? 'download' : 'upload']: true
     };
 
-    data[isDownloadStream ? 'download' : 'upload'] = true;
-
     listener(data);
   }, freq);
 }
+
+export const progressEventDecorator = (total, throttled) => {
+  const lengthComputable = total != null;
+
+  return [(loaded) => throttled[0]({
+    lengthComputable,
+    total,
+    loaded
+  }), throttled[1]];
+}
+
+export const asyncDecorator = (fn) => (...args) => utils.asap(() => fn(...args));