Add a setState and emitChange method

dist/alt-with-runtime.js

@@ -303,8 +303,18 @@ var Alt = (function () {
           _storeName: key,
           alt: this,
           dispatcher: this.dispatcher,
-          getInstance: function () {
+          getInstance: function getInstance() {
             return storeInstance;
+          },
+          emitChange: function emitChange() {
+            this.getInstance().emitChange();
+          },
+          setState: function setState() {
+            var values = arguments[0] === undefined ? {} : arguments[0];
+
+            assign(this, values);
+            this.emitChange();
+            return false;
           }
         });
 

dist/alt.js

@@ -318,8 +318,18 @@ var Alt = (function () {
           _storeName: key,
           alt: this,
           dispatcher: this.dispatcher,
-          getInstance: function () {
+          getInstance: function getInstance() {
             return storeInstance;
+          },
+          emitChange: function emitChange() {
+            this.getInstance().emitChange();
+          },
+          setState: function setState() {
+            var values = arguments[0] === undefined ? {} : arguments[0];
+
+            assign(this, values);
+            this.emitChange();
+            return false;
           }
         });
 

src/alt.js

@@ -263,7 +263,17 @@ your own custom identifier for each store`
       _storeName: key,
       alt: this,
       dispatcher: this.dispatcher,
-      getInstance: () => storeInstance
+      getInstance() {
+        return storeInstance
+      },
+      emitChange() {
+        this.getInstance().emitChange()
+      },
+      setState(values = {}) {
+        assign(this, values)
+        this.emitChange()
+        return false
+      }
     })
 
     const store = new Store(this)

test/index.js

@@ -845,7 +845,7 @@ let tests = {
       onTest() {
         setTimeout(() => {
           this.test = true
-          this.getInstance().emitChange()
+          this.emitChange()
         })
         return false
       }

test/setting-state.js

@@ -0,0 +1,46 @@
+import assert from 'assert'
+import Alt from '../dist/alt-with-runtime'
+
+let alt = new Alt()
+
+let actions = alt.generateActions('fire', 'nothing')
+
+class MyStore {
+  constructor() {
+    this.foo = 1
+    this.bindListeners({ increment: actions.FIRE, nothing: actions.NOTHING })
+  }
+
+  increment() {
+    this.retVal = this.setState({ foo: this.foo + 1 })
+    return this.retVal
+  }
+
+  nothing() {
+    this.setState()
+  }
+}
+
+let myStore = alt.createStore(MyStore)
+
+export default {
+  'using setState to set the state'() {
+    actions.fire()
+
+    let changes = 0
+    let fart = () => {
+      changes += 1
+      assert.equal(changes, 1, 'listen was fired once')
+    }
+
+    myStore.listen(fart)
+
+    assert.equal(myStore.getState().foo, 2, 'foo was incremented')
+    assert.equal(myStore.getState().retVal, false, 'return value of setState is false')
+
+    myStore.unlisten(fart)
+
+    // calling set state without anything doesn't make things crash and burn
+    actions.nothing()
+  }
+}