ES6 SessionStore

src/stores/SessionStore.js

@@ -6,53 +6,54 @@ import EventEmitter from 'events';
  * store that listens for actions and updates its state accordingly, informing any
  * listeners (views) of state changes via the 'update' event.
  */
-function SessionStore() {
-    // Initialise state
-    this._state = {
-        cachedPassword: localStorage.getItem('mx_pass'),
-    };
+class SessionStore extends EventEmitter {
+    constructor() {
+        super();
 
-    dis.register(this._onAction.bind(this));
+        // Initialise state
+        this._state = {
+            cachedPassword: localStorage.getItem('mx_pass'),
+        };
+
+        dis.register(this._onAction.bind(this));
+    }
+
+    _update() {
+        // Persist state to localStorage
+        if (this._state.cachedPassword) {
+            localStorage.setItem('mx_pass', this._state.cachedPassword);
+        } else {
+            localStorage.removeItem('mx_pass', this._state.cachedPassword);
+        }
+
+        this.emit('update');
+    }
+
+    _setState(newState) {
+        this._state = Object.assign(this._state, newState);
+        this._update();
+    }
+
+    _onAction(payload) {
+        switch (payload.action) {
+            case 'cached_password':
+                this._setState({
+                    cachedPassword: payload.cachedPassword,
+                });
+                break;
+            case 'password_changed':
+                this._setState({
+                    cachedPassword: null,
+                });
+                break;
+        }
+    }
+
+    getCachedPassword() {
+        return this._state.cachedPassword;
+    }
 }
 
-// Inherit from EventEmitter
-SessionStore.prototype = EventEmitter.prototype;
-
-SessionStore.prototype._update = function() {
-    // Persist state to localStorage
-    if (this._state.cachedPassword) {
-        localStorage.setItem('mx_pass', this._state.cachedPassword);
-    } else {
-        localStorage.removeItem('mx_pass', this._state.cachedPassword);
-    }
-
-    this.emit('update');
-};
-
-SessionStore.prototype._setState = function(newState) {
-    this._state = Object.assign(this._state, newState);
-    this._update();
-};
-
-SessionStore.prototype._onAction = function(payload) {
-    switch (payload.action) {
-        case 'cached_password':
-            this._setState({
-                cachedPassword: payload.cachedPassword,
-            });
-            break;
-        case 'password_changed':
-            this._setState({
-                cachedPassword: null,
-            });
-            break;
-    }
-};
-
-SessionStore.prototype.getCachedPassword = function() {
-    return this._state.cachedPassword;
-};
-
 // Export singleton getter
 let singletonSessionStore = null;
 if (!singletonSessionStore) {