fix process is not defined in react-native

Author: chentsulin

src/utils/combineReducers.js

@@ -105,9 +105,20 @@ export default function combineReducers(reducers) {
       return newState;
     });
 
-    if (process.env.NODE_ENV !== 'production' && !stateShapeVerified) {
-      verifyStateShape(state, finalState);
-      stateShapeVerified = true;
+    if ((
+      // Node-like CommonJS environments (Browserify, Webpack)
+      typeof process !== 'undefined' &&
+      typeof process.env !== 'undefined' &&
+      process.env.NODE_ENV !== 'production'
+    ) ||
+      // React Native
+      typeof __DEV__ !== 'undefined' &&
+      __DEV__ //eslint-disable-line no-undef
+    ) {
+      if (!stateShapeVerified) {
+        verifyStateShape(state, finalState);
+        stateShapeVerified = true;
+      }
     }
 
     return finalState;