[IMP] store: return data from dispatching an action

src/store/store.ts

@@ -99,12 +99,7 @@ export class Store extends EventBus {
       },
       ...payload
     );
-    if (result instanceof Promise) {
-      return new Promise((resolve, reject) => {
-        result.then(() => resolve());
-        result.catch(reject);
-      });
-    }
+    return result;
   }
 
   commit(type: string, ...payload: any): any {

tests/store/store.test.ts

@@ -160,6 +160,36 @@ describe("basic use", () => {
     expect(store.state.n).toBe(13);
   });
 
+  test("return data from dispatching an action", async () => {
+    const state = { n: 1 };
+    const mutations = {
+      inc({ state }, delta) {
+        state.n += delta;
+      },
+      setN({ state }, n) {
+        state.n = n;
+      }
+    };
+    const actions = {
+      async dosomething({ commit, dispatch }) {
+        const val = await dispatch("setTo10");
+        commit("inc", val);
+      },
+      async setTo10({ commit }) {
+        await Promise.resolve();
+        commit("setN", 10);
+        return 5;
+      }
+    };
+    const store = new Store({ state, mutations, actions });
+
+    expect(store.state.n).toBe(1);
+    store.dispatch("dosomething");
+    expect(store.state.n).toBe(1);
+    await nextTick();
+    expect(store.state.n).toBe(15);
+  });
+
   test("env is given to actions", () => {
     expect.assertions(1);
     const someEnv = <Env>{};