Beginning React+Redux "Music Store" sample

samples/react/MusicStore/ReactApp/store/AlbumDetails.ts

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+import fetch from 'isomorphic-fetch';
+import { typeName, isActionType, Action, Reducer } from '../TypedRedux';
+import { ActionCreator } from './';
+import { Genre } from './GenreList';
+
+// -----------------
+// STATE - This defines the type of data maintained in the Redux store.
+
+export interface AlbumDetailsState {
+    isLoaded: boolean;
+    album: AlbumDetails;
+}
+
+export interface AlbumDetails {
+    AlbumId: string;
+    Title: string;
+    AlbumArtUrl: string;
+    Genre: Genre;
+    Artist: Artist;
+    Price: number;
+}
+
+interface Artist {
+    Name: string;
+}
+
+// -----------------
+// ACTIONS - These are serializable (hence replayable) descriptions of state transitions.
+// They do not themselves have any side-effects; they just describe something that is going to happen.
+// Use @typeName and isActionType for type detection that works even after serialization/deserialization.
+
+@typeName("REQUEST_ALBUM_DETAILS")
+class RequestAlbumDetails extends Action {
+    constructor(public albumId: number) {
+        super();
+    }
+}
+
+@typeName("RECEIVE_ALBUM_DETAILS")
+class ReceiveAlbumDetails extends Action {
+    constructor(public album: AlbumDetails) {
+        super();
+    }
+}
+
+// ----------------
+// ACTION CREATORS - These are functions exposed to UI components that will trigger a state transition.
+// They don't directly mutate state, but they can have external side-effects (such as loading data).
+
+export const actionCreators = {    
+    requestAlbumDetails: (albumId: number): ActionCreator => (dispatch, getState) => {
+        fetch(`/api/albums/${ albumId }`)
+            .then(results => results.json())
+            .then(album => dispatch(new ReceiveAlbumDetails(album)));
+        
+        dispatch(new RequestAlbumDetails(albumId));
+    }
+};
+
+// ----------------
+// REDUCER - For a given state and action, returns the new state. To support time travel, this must not mutate the old state.
+// For unrecognized actions, must return the existing state (or default initial state if none was supplied).
+const unloadedState: AlbumDetailsState = { isLoaded: false, album: null };
+export const reducer: Reducer<AlbumDetailsState> = (state, action) => {
+    if (isActionType(action, RequestAlbumDetails)) {
+        return unloadedState;
+    } else if (isActionType(action, ReceiveAlbumDetails)) {
+        return { isLoaded: true, album: action.album };
+    } else {
+        return state || unloadedState;
+    }
+};