Remove superfluous eventListener

Author: Natasha08

dist/middleware.js

@@ -22,9 +22,8 @@ var createWorker = function createWorker(worker, type) {
 
   worker.addEventListener('message', function (_ref) {
     var data = _ref.data;
-
-    scopedDispatch(data);
-  });
+    return scopedDispatch(data);
+  }, false);
 
   return function (_ref2) {
     var dispatch = _ref2.dispatch,
@@ -37,10 +36,6 @@ var createWorker = function createWorker(worker, type) {
         var meta = action.meta;
 
         if (meta && meta.webworker && meta.type === type) {
-          worker.addEventListener('message', function (_ref3) {
-            var data = _ref3.data;
-            return dispatch(data);
-          }, false);
           worker.postMessage(actionHelper(action, getState));
         }
         return next(action);

src/middleware.js

@@ -3,10 +3,8 @@ import errorCheck from './error_check';
 
 const createWorker = (worker, type, actionHelper=_.identity) => {
   let scopedDispatch = _.noop;
-  
-  worker.addEventListener('message', ({ data }) => {
-    scopedDispatch(data);
-  });
+
+  worker.addEventListener('message', ({ data }) => scopedDispatch(data), false);
 
   return ({dispatch, getState}) => {
     scopedDispatch = dispatch;
@@ -15,7 +13,6 @@ const createWorker = (worker, type, actionHelper=_.identity) => {
       return (action) => {
         const {meta} = action;
         if (meta && meta.webworker && meta.type === type) {
-          worker.addEventListener('message', ({data}) => dispatch(data), false);
           worker.postMessage(actionHelper(action, getState));
         }
         return next(action);