Add post-launch tweaks

template/src/App.test.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import { render } from '@testing-library/react';
 import { Provider } from 'react-redux';
-import store from './store';
+import store from './app/store';
 import App from './App';
 
 test('renders learn react link', () => {

template/src/store.js → template/src/app/store.js

@@ -1,5 +1,5 @@
 import { configureStore } from '@reduxjs/toolkit';
-import counterReducer from './features/counter/counterSlice';
+import counterReducer from '../features/counter/counterSlice';
 
 export default configureStore({
   reducer: {

template/src/features/counter/Counter.js

@@ -4,14 +4,15 @@ import {
   decrement,
   increment,
   incrementByAmount,
+  incrementAsync,
   selectCount,
 } from './counterSlice';
 import styles from './Counter.module.css';
 
 export function Counter() {
   const count = useSelector(selectCount);
   const dispatch = useDispatch();
-  const [incrementAmount, setIncrementAmount] = useState(2);
+  const [incrementAmount, setIncrementAmount] = useState('2');
 
   return (
     <div>
@@ -42,13 +43,17 @@ export function Counter() {
         <button
           className={styles.button}
           onClick={() =>
-            dispatch(
-              incrementByAmount({ amount: Number(incrementAmount) || 0 })
-            )
+            dispatch(incrementByAmount(Number(incrementAmount) || 0))
           }
         >
           Add Amount
         </button>
+        <button
+          className={styles.asyncButton}
+          onClick={() => dispatch(incrementAsync(Number(incrementAmount) || 0))}
+        >
+          Add Async
+        </button>
       </div>
     </div>
   );

template/src/features/counter/Counter.module.css

@@ -4,7 +4,7 @@
   justify-content: center;
 }
 
-.row:first-child {
+.row:not(:last-child) {
   margin-bottom: 16px;
 }
 
@@ -48,3 +48,28 @@
 .button:active {
   background-color: rgba(112, 76, 182, 0.2);
 }
+
+.asyncButton {
+  composes: button;
+  position: relative;
+  margin-left: 8px;
+}
+
+.asyncButton:after {
+  content: "";
+  background-color: rgba(112, 76, 182, 0.15);
+  display: block;
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  left: 0;
+  top: 0;
+  opacity: 0;
+  transition: width 1s linear, opacity 0.5s ease 1s;
+}
+
+.asyncButton:active:after {
+  width: 0%;
+  opacity: 1;
+  transition: 0s
+}

template/src/features/counter/counterSlice.js

@@ -7,22 +7,36 @@ export const slice = createSlice({
   },
   reducers: {
     increment: state => {
-      // Redux Toolkit allows us to 'mutate' the state. It doesn't actually
-      // mutate the state because it uses the immer library, which detects
-      // changes to a "draft state" and produces a brand new immutable state
-      // based off those changes
+      // Redux Toolkit allows us to write "mutating" logic in reducers. It
+      // doesn't actually mutate the state because it uses the immer library,
+      // which detects changes to a "draft state" and produces a brand new
+      // immutable state based off those changes
       state.value += 1;
     },
     decrement: state => {
       state.value -= 1;
     },
     incrementByAmount: (state, action) => {
-      state.value += action.payload.amount;
+      state.value += action.payload;
     },
   },
 });
 
-export const selectCount = state => state.counter.value;
 export const { increment, decrement, incrementByAmount } = slice.actions;
 
+// The function below is called a thunk and allows us to perform async logic. It
+// can be dispatched like a regular action: `dispatch(incrementAsync(10))`. This
+// will call the thunk with the `dispatch` function as the first argument. Async
+// code can then be executed and other actions can be dispatched
+export const incrementAsync = amount => dispatch => {
+  setTimeout(() => {
+    dispatch(incrementByAmount(amount));
+  }, 1000);
+};
+
+// The function below is called a selector and allows us to select a value from
+// the state. Selectors can also be defined inline where they're used instead of
+// in the slice file. For example: `useSelector((state) => state.counter.value)`
+export const selectCount = state => state.counter.value;
+
 export default slice.reducer;

template/src/index.js

@@ -2,7 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import './index.css';
 import App from './App';
-import store from './store';
+import store from './app/store';
 import { Provider } from 'react-redux';
 import * as serviceWorker from './serviceWorker';