Iterate using for in instead of Object.keys and minor fixes (#3371)

* Iterate using for in

* Use single quotes for string literals without interpolation

* Fix punctuation.

* Limit node version until we update jest.


Co-authored-by: Tim Dorr <[email protected]>

Author: pvorona

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "node"
+  - "11.10.1"
 install:
   - npm i -g [email protected]
   - npm ci

src/applyMiddleware.js

@@ -21,8 +21,8 @@ export default function applyMiddleware(...middlewares) {
     const store = createStore(...args)
     let dispatch = () => {
       throw new Error(
-        `Dispatching while constructing your middleware is not allowed. ` +
-          `Other middleware would not be applied to this dispatch.`
+        'Dispatching while constructing your middleware is not allowed. ' +
+          'Other middleware would not be applied to this dispatch.'
       )
     }
 

src/bindActionCreators.js

@@ -39,10 +39,8 @@ export default function bindActionCreators(actionCreators, dispatch) {
     )
   }
 
-  const keys = Object.keys(actionCreators)
   const boundActionCreators = {}
-  for (let i = 0; i < keys.length; i++) {
-    const key = keys[i]
+  for (const key in actionCreators) {
     const actionCreator = actionCreators[key]
     if (typeof actionCreator === 'function') {
       boundActionCreators[key] = bindActionCreator(actionCreator, dispatch)

src/createStore.js

@@ -36,7 +36,7 @@ export default function createStore(reducer, preloadedState, enhancer) {
     throw new Error(
       'It looks like you are passing several store enhancers to ' +
         'createStore(). This is not supported. Instead, compose them ' +
-        'together to a single function'
+        'together to a single function.'
     )
   }