Beginning React+Redux "Music Store" sample

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

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+import fetch from 'isomorphic-fetch';
+import { typeName, isActionType, Action, Reducer } from '../TypedRedux';
+import { ActionCreator } from './';
+import { Album } from './FeaturedAlbums';
+
+// -----------------
+// STATE - This defines the type of data maintained in the Redux store.
+
+export interface GenreDetailsState {
+    isLoaded: boolean;
+    albums: Album[];
+}
+
+// -----------------
+// 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_GENRE_DETAILS")
+class RequestGenreDetails extends Action {
+    constructor(public genreId: number) {
+        super();
+    }
+}
+
+@typeName("RECEIVE_GENRE_DETAILS")
+class ReceiveGenreDetails extends Action {
+    constructor(public albums: Album[]) {
+        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 = {    
+    requestGenreDetails: (genreId: number): ActionCreator => (dispatch, getState) => {
+        fetch(`/api/genres/${ genreId }/albums`)
+            .then(results => results.json())
+            .then(albums => dispatch(new ReceiveGenreDetails(albums)));
+        
+        dispatch(new RequestGenreDetails(genreId));
+    }
+};
+
+// ----------------
+// 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: GenreDetailsState = { isLoaded: false, albums: [] };
+export const reducer: Reducer<GenreDetailsState> = (state, action) => {
+    if (isActionType(action, RequestGenreDetails)) {
+        return unloadedState;
+    } else if (isActionType(action, ReceiveGenreDetails)) {
+        return { isLoaded: true, albums: action.albums };
+    } else {
+        return state || unloadedState;
+    }
+};