Remove lodash.

This boosts perf by not exhaustively checking every action of it's object-ness. We also no longer need to bundle any of lodash, so this saves a good number of bytes too!

Author: timdorr

.babelrc

@@ -26,11 +26,6 @@
       "plugins": [
         ["transform-es2015-modules-commonjs", { "loose": true }]
       ]
-    },
-    "es": {
-      "plugins": [
-        "./build/use-lodash-es"
-      ]
     }
   }
 }

build/use-lodash-es.js

@@ -60,8 +60,6 @@
   },
   "homepage": "http://redux.js.org",
   "dependencies": {
-    "lodash": "^4.2.1",
-    "lodash-es": "^4.2.1",
     "loose-envify": "^1.1.0",
     "symbol-observable": "^1.0.3"
   },

package-lock.json

@@ -1,5 +1,4 @@
 import { ActionTypes } from './createStore'
-import isPlainObject from 'lodash/isPlainObject'
 import warning from './utils/warning'
 
 function getUndefinedStateErrorMessage(key, action) {
@@ -26,7 +25,7 @@ function getUnexpectedStateShapeWarningMessage(inputState, reducers, action, une
     )
   }
 
-  if (!isPlainObject(inputState)) {
+  if (!inputState || inputState.constructor !== Object) {
     return (
       `The ${argumentName} has unexpected type of "` +
       ({}).toString.call(inputState).match(/\s([a-z|A-Z]+)/)[1] +

package.json

@@ -1,4 +1,3 @@
-import isPlainObject from 'lodash/isPlainObject'
 import $$observable from 'symbol-observable'
 
 /**
@@ -147,7 +146,7 @@ export default function createStore(reducer, preloadedState, enhancer) {
    * return something else (for example, a Promise you can await).
    */
   function dispatch(action) {
-    if (!isPlainObject(action)) {
+    if (!action || action.constructor !== Object) {
       throw new Error(
         'Actions must be plain objects. ' +
         'Use custom middleware for async actions.'