Fix typescript error in example

example/package.json

@@ -23,5 +23,11 @@
     "@types/react": "^16.7.13",
     "@types/react-dom": "^16.0.11",
     "typescript": "^3.2.2"
-  }
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not ie <= 11",
+    "not op_mini all"
+  ]
 }

example/src/Store.ts

@@ -1,6 +1,6 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
 
-import {Action, createStore} from 'redux';
+import {Action, createStore, Store} from 'redux';
 import reducer from './reducer';
 
 export interface IState {
@@ -18,14 +18,16 @@ export type Action =
       index: number;
     };
 
-export function makeStore() {
-  return createStore(reducer, {
-    lastUpdated: 0,
-    todos: [
-      'Make the fire!',
-      'Fix the breakfast!',
-      'Wash the dishes!',
-      'Do the mopping!',
-    ],
-  });
+export function makeStore(): Store<IState, Action> {
+  return createStore(reducer, INITIAL_STATE);
 }
+
+export const INITIAL_STATE: IState = {
+  lastUpdated: 0,
+  todos: [
+    'Make the fire!',
+    'Fix the breakfast!',
+    'Wash the dishes!',
+    'Do the mopping!',
+  ],
+};

example/src/react-app-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="react-scripts" />

example/src/reducer.ts

@@ -1,8 +1,8 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
 
-import {Action, IState} from './Store';
+import {Action, IState, INITIAL_STATE} from './Store';
 
-export default function reducer(state: IState, action: Action) {
+export default function reducer(state: IState = INITIAL_STATE, action: Action) {
   switch (action.type) {
     case 'add todo': {
       return {

example/tsconfig.json

@@ -1,31 +1,38 @@
 {
   "compilerOptions": {
-    "baseUrl": ".",
-    "outDir": "build/dist",
-    "module": "esnext",
-    "target": "es5",
-    "lib": ["es6", "dom"],
-    "sourceMap": true,
     "allowJs": true,
-    "jsx": "react",
-    "moduleResolution": "node",
-    "rootDir": "src",
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
+    "importHelpers": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "lib": ["es6", "dom"],
+    "module": "esnext",
+    "moduleResolution": "node",
+    "noEmit": true,
+    "noImplicitAny": true,
     "noImplicitReturns": true,
     "noImplicitThis": true,
-    "noImplicitAny": true,
-    "importHelpers": true,
+    "noUnusedLocals": true,
+    "outDir": "build/dist",
+    "resolveJsonModule": true,
+    "rootDir": "src",
+    "skipLibCheck": false,
+    "sourceMap": true,
+    "strict": true,
     "strictNullChecks": true,
     "suppressImplicitAnyIndexErrors": true,
-    "noUnusedLocals": true
+    "target": "es5"
   },
   "exclude": [
-    "build",
-    "scripts",
     "acceptance-tests",
-    "webpack",
+    "build",
     "jest",
+    "node_modules",
+    "scripts",
     "src/setupTests.ts",
-    "node_modules"
-  ]
+    "webpack"
+  ],
+  "include": ["src"]
 }