const game: Saga = function* game(getState) {

    const score1 = yield* playLevelOne(getState)
    yield put(showScore(score1))

    const score2 = yield* playLevelTwo(getState)
    yield put(showScore(score2))

    const score3 = yield* playLevelThree(getState)
    yield put(showScore(score3))

  }

 function* bgSync() {
   try {
     while(true) {
       yield put({type: 'REQUEST_START'})
       const result = yield call(someApi)
       yield put({type: 'REQUEST_SUCCESS', result})
       yield call(delay, 5000)
     }
   } catch(error) {
     if(error instanceof SagaCancellationException)
       yield put({type: 'REQUEST_FAILURE', message: 'Sync cancelled!'})
   }
 }

  const fetchPostsWithTimeout:Saga = function* fetchPostsWithTimeout() {
    while( yield take('FETCH_POSTS') ) {
      // starts a race between 2 effects
      const {posts, timeout} = yield race({
        posts   : call(fetchApi, '/posts'),
        timeout : call(delay, 1000)
      })

      if(posts)
        put( {type: 'RECEIVE_POSTS', posts} )
      else
        put( {type: 'TIMEOUT_ERROR'} )
    }
  }

  const incrementAsync:Saga = function* incrementAsync() {

    while(true) {

      // wait for each INCREMENT_ASYNC action
      const nextAction = yield take('INCREMENT_ASYNC')

      // delay is a sample function
      // return a Promise that resolves after (ms) milliseconds
      yield delay(1000)

      // dispatch INCREMENT_COUNTER
      yield put( {type: 'INCREMENT_COUNTER'} )
    }

  }

 function* fetchProducts() {
   yield put( {type: 'REQUEST_PRODUCTS'} )
   const products = yield call(fetchApi, '/products')
   yield put( {type: 'RECEIVE_PRODUCTS', products } )
 }

 function* fetchPosts() {
   yield put( {type: 'REQUEST_POSTS'} )
   const posts = yield call(fetchApi, '/posts')
   yield put( {type: 'RECEIVE_POSTS', posts} )
 }