Update router state properties directly (#3446)

* Update router state properties directly.

* Reuse assignRouterState in creating the router.

* Add a bonus props.routes to withRouter

modules/Router.js

@@ -4,9 +4,8 @@ import createTransitionManager from './createTransitionManager'
 import { routes } from './InternalPropTypes'
 import RouterContext from './RouterContext'
 import { createRoutes } from './RouteUtils'
-import { createRouterObject } from './RouterUtils'
+import { createRouterObject, assignRouterState } from './RouterUtils'
 import warning from './routerWarning'
-import assign from 'object-assign'
 
 const { func, object } = React.PropTypes
 
@@ -91,7 +90,7 @@ const Router = React.createClass({
       } else {
         // Keep the identity of this.router because of a caveat in ContextUtils:
         // they only work if the object identity is preserved.
-        assign(this.router, this.createRouterObject(state))
+        assignRouterState(this.router, state)
         this.setState(state, this.props.onUpdate)
       }
     })

modules/RouterUtils.js

@@ -1,9 +1,17 @@
 export function createRouterObject(history, transitionManager, state) {
-  return {
+  const router = {
     ...history,
     setRouteLeaveHook: transitionManager.listenBeforeLeavingRoute,
-    isActive: transitionManager.isActive,
-    location: state.location,
-    params: state.params
+    isActive: transitionManager.isActive
   }
+
+  return assignRouterState(router, state)
+}
+
+export function assignRouterState(router, { location, params, routes }) {
+  router.location = location
+  router.params = params
+  router.routes = routes
+
+  return router
 }

modules/__tests__/withRouter-test.js

@@ -15,6 +15,8 @@ describe('withRouter', function () {
       expect(this.props.params).toBe(this.props.router.params)
       expect(this.props.location).toExist()
       expect(this.props.location).toBe(this.props.router.location)
+      expect(this.props.routes).toExist()
+      expect(this.props.routes).toBe(this.props.router.routes)
       return <h1>{this.props.router.location.pathname}</h1>
     }
   }

modules/withRouter.js

@@ -15,13 +15,14 @@ export default function withRouter(WrappedComponent) {
 
     render() {
       const { router } = this.context
-      const { params, location } = router
+      const { params, location, routes } = router
       return (
         <WrappedComponent
           {...this.props}
           router={router}
           params={params}
           location={location}
+          routes={routes}
         />
       )
     }

package.json

@@ -35,7 +35,6 @@
     "history": "^2.0.1",
     "hoist-non-react-statics": "^1.0.5",
     "invariant": "^2.2.1",
-    "object-assign": "^4.1.0",
     "warning": "^2.1.0"
   },
   "peerDependencies": {