Fix lodash imports and linting

Author: gaearon

src/instrument.js

@@ -1,4 +1,4 @@
-import {difference} from 'lodash/array';
+import difference from 'lodash/difference';
 
 export const ActionTypes = {
   PERFORM_ACTION: 'PERFORM_ACTION',
@@ -344,7 +344,7 @@ export default function instrument(monitorReducer = () => null) {
 
     function liftReducer(r) {
       if (typeof r !== 'function') {
-        if (r && typeof r['default'] === 'function') {
+        if (r && typeof r.default === 'function') {
           throw new Error(
             'Expected the reducer to be a function. ' +
             'Instead got an object with a "default" field. ' +

src/persistState.js

@@ -1,5 +1,5 @@
-import {mapValues} from 'lodash/object';
-import {identity} from 'lodash/utility';
+import mapValues from 'lodash/mapValues';
+import identity from 'lodash/identity';
 
 export default function persistState(sessionId, deserializeState = identity, deserializeAction = identity) {
   if (!sessionId) {

test/instrument.spec.js

@@ -339,7 +339,7 @@ describe('instrument', () => {
 
   it('warns if the reducer is not a function but has a default field that is', () => {
     expect(() =>
-      createStore(({ default: () => {} }), instrument())
+      createStore(({ 'default': () => {} }), instrument())
     ).toThrow(
       'Expected the reducer to be a function. ' +
       'Instead got an object with a "default" field. ' +
@@ -350,7 +350,7 @@ describe('instrument', () => {
 
   it('throws if there are more than one instrument enhancer included', () => {
     expect(() => {
-      createStore(counter, compose(instrument(), instrument()))
+      createStore(counter, compose(instrument(), instrument()));
     }).toThrow(
       'DevTools instrumentation should not be applied more than once. ' +
       'Check your store configuration.'

test/persistState.spec.js

@@ -91,7 +91,7 @@ describe('persistState', () => {
   it('should warn if read from localStorage fails', () => {
     const spy = expect.spyOn(console, 'warn');
     delete global.localStorage.getItem;
-    const store = createStore(reducer, compose(instrument(), persistState('id')));
+    createStore(reducer, compose(instrument(), persistState('id')));
 
     expect(spy.calls).toContain(
       /Could not read debug session from localStorage/,