Fix issue vuejs#1115

Author: Podgorniy Mikhail

.gitignore

@@ -10,3 +10,4 @@ explorations
 *.log
 test/e2e/reports
 test/e2e/screenshots
+*.history

src/store.js

@@ -129,11 +129,19 @@ export class Store {
       return
     }
 
-    this._actionSubscribers.forEach(sub => sub(action, this.state))
+    this._actionSubscribers
+      .filter(sub => sub.before)
+      .forEach(sub => sub.before(action, this.state))
 
-    return entry.length > 1
+    const result = entry.length > 1
       ? Promise.all(entry.map(handler => handler(payload)))
       : entry[0](payload)
+
+    result.then(() => this._actionSubscribers
+      .filter(sub => sub.after)
+      .forEach(sub => sub.after(action, this.state)))
+
+    return result
   }
 
   subscribe (fn) {

types/index.d.ts

@@ -19,7 +19,7 @@ export declare class Store<S> {
   commit: Commit;
 
   subscribe<P extends MutationPayload>(fn: (mutation: P, state: S) => any): () => void;
-  subscribeAction<P extends ActionPayload>(fn: (action: P, state: S) => any): () => void;
+  subscribeAction<P extends ActionPayload>(fn: SubscribeActionOptions<P, S>): () => void;
   watch<T>(getter: (state: S, getters: any) => T, cb: (value: T, oldValue: T) => void, options?: WatchOptions): () => void;
 
   registerModule<T>(path: string, module: Module<T, S>, options?: ModuleOptions): void;
@@ -69,6 +69,15 @@ export interface ActionPayload extends Payload {
   payload: any;
 }
 
+export type ActionSubscriber<P, S> = (action: P, state: S) => any;
+
+export interface ActionSubscribersObject<P, S> {
+  before?: ActionSubscriber<P, S>;
+  after?: ActionSubscriber<P, S>;
+}
+
+export type SubscribeActionOptions<P, S> = ActionSubscriber<P, S> | ActionSubscribersObject<P, S>;
+
 export interface DispatchOptions {
   root?: boolean;
 }