Add replacePath functionality

README.md

@@ -150,3 +150,8 @@ to this and all future URL changes. Pass `false` to make it start
 reacting again. This is useful if replaying snapshots while using the
 `forceRefresh` option of the browser history which forces full
 reloads. It's a rare edge case.
+
+### `replacePath(path)`
+
+Similar to `updatePath` except it replaces the current path in the browser
+history instead of adding a new entry.

src/index.js

@@ -4,7 +4,7 @@
 const UPDATE_PATH = "@@router/UPDATE_PATH";
 const SELECT_STATE = state => state.routing;
 
-// Action creator
+// Action creators
 
 function updatePath(path, noRouterUpdate) {
   return {
@@ -14,6 +14,14 @@ function updatePath(path, noRouterUpdate) {
   }
 }
 
+function replacePath(path) {
+  return {
+    type: UPDATE_PATH,
+    path: path,
+    replaceState: true
+  }
+}
+
 // Reducer
 
 const initialState = typeof window === 'undefined' ? {} : {
@@ -24,7 +32,8 @@ function update(state=initialState, action) {
   if(action.type === UPDATE_PATH) {
     return Object.assign({}, state, {
       path: action.path,
-      noRouterUpdate: action.noRouterUpdate
+      noRouterUpdate: action.noRouterUpdate,
+      replaceState: action.replaceState
     });
   }
   return state;
@@ -63,7 +72,12 @@ function syncReduxAndRouter(history, store, selectRouterState = SELECT_STATE) {
     // edge cases.
     if(routing.path !== locationToString(window.location) &&
        !routing.noRouterUpdate) {
-      history.pushState(null, routing.path);
+      if(routing.replaceState) {
+        history.replaceState(null, routing.path);
+      }
+      else {
+        history.pushState(null, routing.path);
+      }
     }
   });
 
@@ -76,6 +90,7 @@ function syncReduxAndRouter(history, store, selectRouterState = SELECT_STATE) {
 module.exports = {
   UPDATE_PATH,
   updatePath,
+  replacePath,
   syncReduxAndRouter,
   routeReducer: update,
 };