Electron working

chapter08/src/regionsApp/serviceApi.js

@@ -5,5 +5,5 @@ import axios from "axios";
 export const getCountriesAPI = () =>
     axios.get(`http://fk-server:8080/countries`);
 
-export const getRegionsAPI = country =>
+export const getRegionsAPI = (country: string) =>
     axios.get(`http://fk-server:8080/regions/${country}`);

chapter12/src/regionsStyledApp/serviceApi.js

@@ -5,5 +5,5 @@ import axios from "axios";
 export const getCountriesAPI = () =>
     axios.get(`http://192.168.1.200:8080/countries`);
 
-export const getRegionsAPI = country =>
+export const getRegionsAPI = (country: string) =>
     axios.get(`http://192.168.1.200:8080/regions/${country}`);

chapter12/src/regionsStyledApp/world.actions.js

@@ -33,18 +33,18 @@ export type CountriesAction = {
 export const countriesRequest = () =>
     ({
         type: COUNTRIES_REQUEST
-    }: CountriesActions);
+    }: CountriesAction);
 
 export const countriesSuccess = (listOfCountries: []) =>
     ({
         type: COUNTRIES_SUCCESS,
         listOfCountries
-    }: CountriesActions);
+    }: CountriesAction);
 
 export const countriesFailure = () =>
     ({
         type: COUNTRIES_FAILURE
-    }: CountriesActions);
+    }: CountriesAction);
 
 // Regions actions
 

chapter13/.eslintrc

@@ -0,0 +1,26 @@
+{
+    "parser": "babel-eslint",
+    "parserOptions": {
+        "ecmaVersion": 2017,
+        "sourceType": "module"
+    },
+    "env": {
+        "node": true,
+        "browser": true,
+        "es6": true,
+        "jest": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:flowtype/recommended",
+        "plugin:react/recommended"
+    ],
+    "plugins": ["babel", "flowtype", "react"],
+    "rules": {
+        "no-console": "off",
+        "no-var": "error",
+        "prefer-const": "error",
+        "flowtype/no-types-missing-file-annotation": 0,
+        "flowtype/unclear-type": 0
+    }
+}

chapter13/.flowconfig

@@ -0,0 +1,16 @@
+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+all=warn
+untyped-type-import=off
+unsafe-getters-setters=off
+unclear-type=off
+
+[options]
+include_warnings=true
+
+[strict]

chapter13/.gitignore

@@ -0,0 +1,21 @@
+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

chapter13/.prettierrc

@@ -0,0 +1,4 @@
+{
+    "tabWidth": 4,
+    "printWidth": 75
+}

chapter13/canada_regions.txt

@@ -0,0 +1 @@
+[{"countryCode":"CA","regionCode":"1","regionName":"Alberta"},{"countryCode":"CA","regionCode":"10","regionName":"Quebec"},{"countryCode":"CA","regionCode":"11","regionName":"Saskatchewan"},{"countryCode":"CA","regionCode":"12","regionName":"Yukon"},{"countryCode":"CA","regionCode":"13","regionName":"Northwest Territories"},{"countryCode":"CA","regionCode":"14","regionName":"Nunavut"},{"countryCode":"CA","regionCode":"2","regionName":"British Columbia"},{"countryCode":"CA","regionCode":"3","regionName":"Manitoba"},{"countryCode":"CA","regionCode":"4","regionName":"New Brunswick"},{"countryCode":"CA","regionCode":"5","regionName":"Newfoundland and Labrador"},{"countryCode":"CA","regionCode":"7","regionName":"Nova Scotia"},{"countryCode":"CA","regionCode":"8","regionName":"Ontario"},{"countryCode":"CA","regionCode":"9","regionName":"Prince Edward Island"}]

chapter13/config-overrides.js

@@ -0,0 +1,11 @@
+const rewireEslint = require("react-app-rewire-eslint");
+function overrideEslintOptions(options) {
+    // do stuff with the eslint options...
+    return options;
+}
+
+/* global module */
+module.exports = function override(config, env) {
+    config = rewireEslint(config, env, overrideEslintOptions);
+    return config;
+};

chapter13/electron-start.js

@@ -0,0 +1,42 @@
+/* @flow */
+
+const { app, BrowserWindow } = require("electron");
+const {
+    default: installExtension,
+    REACT_DEVELOPER_TOOLS,
+    REDUX_DEVTOOLS
+} = require("electron-devtools-installer");
+
+let mainWindow;
+
+const createWindow = () => {
+    mainWindow = new BrowserWindow({
+        height: 768,
+        width: 1024,
+        icon: "./src/regionsApp/r_icon.png"
+    });
+    mainWindow.loadURL("http://localhost:3000");
+
+    mainWindow.webContents.openDevTools();
+
+    installExtension(REACT_DEVELOPER_TOOLS)
+        .then(name => console.log(`Added Extension:  ${name}`))
+        .catch(err => console.log("An error occurred: ", err));
+
+    installExtension(REDUX_DEVTOOLS)
+        .then(name => console.log(`Added Extension:  ${name}`))
+        .catch(err => console.log("An error occurred: ", err));
+
+    mainWindow.on("closed", () => {
+        mainWindow = null;
+    });
+};
+
+app.on("ready", createWindow);
+
+app.on("activate", () => mainWindow === null && createWindow());
+
+app.on(
+    "window-all-closed",
+    () => process.platform !== "darwin" && app.quit()
+);

chapter13/electron-start.with.debugging.js

@@ -0,0 +1,26 @@
+/* @flow */
+
+const { app, BrowserWindow } = require("electron");
+
+let mainWindow;
+
+const createWindow = () => {
+    mainWindow = new BrowserWindow({
+        height: 768,
+        width: 1024
+    });
+    mainWindow.loadURL("http://localhost:3000");
+    // mainWindow.webContents.openDevTools();
+    mainWindow.on("closed", () => {
+        mainWindow = null;
+    });
+};
+
+app.on("ready", createWindow);
+
+app.on("activate", () => mainWindow === null && createWindow());
+
+app.on(
+    "window-all-closed",
+    () => process.platform !== "darwin" && app.quit()
+);

chapter13/electron-start.without.debugging.js

@@ -0,0 +1,25 @@
+/* @flow */
+
+const { app, BrowserWindow } = require("electron");
+
+let mainWindow;
+
+const createWindow = () => {
+    mainWindow = new BrowserWindow({
+        height: 768,
+        width: 1024
+    });
+    mainWindow.loadURL("http://localhost:3000");
+    mainWindow.on("closed", () => {
+        mainWindow = null;
+    });
+};
+
+app.on("ready", createWindow);
+
+app.on("activate", () => mainWindow === null && createWindow());
+
+app.on(
+    "window-all-closed",
+    () => process.platform !== "darwin" && app.quit()
+);

chapter13/package.json

@@ -0,0 +1,44 @@
+{
+    "name": "chapter13",
+    "version": "0.1.0",
+    "private": true,
+    "devDependencies": {
+        "babel-eslint": "^10.0.1",
+        "electron": "^3.0.2",
+        "electron-devtools-installer": "^2.2.4",
+        "eslint": "^5.6.1",
+        "eslint-config-recommended": "^4.0.0",
+        "eslint-plugin-babel": "^5.2.1",
+        "eslint-plugin-flowtype": "^2.50.3",
+        "eslint-plugin-react": "^7.11.1",
+        "flow": "^0.2.3",
+        "flow-bin": "^0.81.0",
+        "flow-typed": "^2.5.1",
+        "react-app-rewire-eslint": "^0.2.3",
+        "react-app-rewired": "^1.6.2",
+        "react-scripts": "1.1.5",
+        "redux-devtools-extension": "^2.13.5"
+    },
+    "dependencies": {
+        "axios": "^0.18.0",
+        "connected-react-router": "^4.5.0",
+        "node-notifier": "^5.2.1",
+        "react": "^16.5.2",
+        "react-dom": "^16.5.2",
+        "react-loadable": "^5.5.0",
+        "react-redux": "^5.0.7",
+        "react-router-dom": "^4.3.1",
+        "redux": "^4.0.0",
+        "redux-thunk": "^2.3.0"
+    },
+    "main": "electron-start.js",
+    "scripts": {
+        "electron": "electron .",
+        "start": "HOST=localhost react-app-rewired start",
+        "build": "react-app-rewired build",
+        "test": "react-app-rewired test --env=jsdom",
+        "eject": "react-app-rewired eject",
+        "flow": "flow",
+        "addTypes": "flow-typed install"
+    }
+}

chapter13/public/index.html

@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="theme-color" content="#000000">
+    <!--
+      manifest.json provides metadata used when your web app is added to the
+      homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
+    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>
+      You need to enable JavaScript to run this app.
+    </noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

chapter13/public/manifest.json

@@ -0,0 +1,15 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    }
+  ],
+  "start_url": "./index.html",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

chapter13/src/App.css

@@ -0,0 +1,28 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  animation: App-logo-spin infinite 20s linear;
+  height: 80px;
+}
+
+.App-header {
+  background-color: #222;
+  height: 150px;
+  padding: 20px;
+  color: white;
+}
+
+.App-title {
+  font-size: 1.5em;
+}
+
+.App-intro {
+  font-size: large;
+}
+
+@keyframes App-logo-spin {
+  from { transform: rotate(0deg); }
+  to { transform: rotate(360deg); }
+}

chapter13/src/App.js

@@ -0,0 +1,22 @@
+import React, { Component } from "react";
+import logo from "./logo.svg";
+import "./App.css";
+
+class App extends Component {
+    render() {
+        return (
+            <div className="App">
+                <header className="App-header">
+                    <img src={logo} className="App-logo" alt="logo" />
+                    <h1 className="App-title">Welcome to React</h1>
+                </header>
+                <p className="App-intro">
+                    To get started, edit <code>src/App.js</code> and save
+                    to reload!
+                </p>
+            </div>
+        );
+    }
+}
+
+export default App;

chapter13/src/App.regions.js

@@ -0,0 +1,59 @@
+/* @flow */
+
+import React, { Component, Fragment } from "react";
+import { Provider } from "react-redux";
+import { getRegions } from "./regionsApp/world.actions";
+
+import {
+    ConnectedCountrySelect,
+    ConnectedRegionsTable
+} from "./regionsApp";
+
+import { store } from "./regionsApp/store";
+
+class App extends Component<{}> {
+    render() {
+        return (
+            <Provider store={store}>
+                <Fragment>
+                    <ConnectedCountrySelect />
+                    <ConnectedRegionsTable />
+                </Fragment>
+            </Provider>
+        );
+    }
+}
+
+const electron = window.require("electron").remote;
+const { Menu } = electron;
+
+const template = [
+    {
+        label: "Countries",
+        submenu: [
+            {
+                label: "Uruguay",
+                accelerator: "Alt+CommandOrControl+U",
+                icon:
+                    "/home/fkereki/JS_BOOK/modernjs/chapter13/src/regionsApp/flag-uruguay.png",
+                click: () => store.dispatch(getRegions("UY"))
+            },
+            {
+                label: "Hungary",
+                accelerator: "Alt+CommandOrControl+H",
+                icon:
+                    "/home/fkereki/JS_BOOK/modernjs/chapter13/src/regionsApp/flag-hungary.png",
+                click: () => store.dispatch(getRegions("HU"))
+            }
+        ]
+    },
+    {
+        label: "Bye!",
+        role: "quit"
+    }
+];
+
+const mainMenu = Menu.buildFromTemplate(template);
+Menu.setApplicationMenu(mainMenu);
+
+export default App;

chapter13/src/App.test.js

@@ -0,0 +1,9 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+it('renders without crashing', () => {
+  const div = document.createElement('div');
+  ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});

chapter13/src/general.css

@@ -0,0 +1,5 @@
+.bordered {
+    border: 1px solid blue;
+    padding: 2px;
+    margin: 4px;
+}

chapter13/src/index.css

@@ -0,0 +1,5 @@
+body {
+  margin: 0;
+  padding: 0;
+  font-family: sans-serif;
+}

chapter13/src/index.js

@@ -0,0 +1,8 @@
+import React from "react";
+import ReactDOM from "react-dom";
+import "./index.css";
+import App from "./App.regions";
+import registerServiceWorker from "./registerServiceWorker";
+
+ReactDOM.render(<App />, document.getElementById("root"));
+registerServiceWorker();

chapter13/src/logo.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
+        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
+        <circle cx="420.9" cy="296.5" r="45.7"/>
+        <path d="M520.5 78.1z"/>
+    </g>
+</svg>

chapter13/src/regionsApp/countrySelect.component.js

@@ -0,0 +1,64 @@
+/* @flow */
+
+import React from "react";
+import PropTypes from "prop-types";
+
+import "../general.css";
+
+export class CountrySelect extends React.PureComponent<{
+    loading: boolean,
+    list: Array<{
+        countryCode: string,
+        countryName: string
+    }>,
+    currentCountry: string,
+    onSelect: string => void,
+    getCountries: () => void
+}> {
+    static propTypes = {
+        loading: PropTypes.bool.isRequired,
+        list: PropTypes.arrayOf(PropTypes.object).isRequired,
+        currentCountry: PropTypes.string.isRequired,
+        onSelect: PropTypes.func.isRequired,
+        getCountries: PropTypes.func.isRequired
+    };
+
+    componentDidMount() {
+        if (this.props.list.length === 0) {
+            this.props.getCountries();
+        }
+    }
+
+    onSelect = (e: { target: HTMLOptionElement }) =>
+        this.props.onSelect(e.target.value);
+
+    render() {
+        if (this.props.loading) {
+            return <div className="bordered">Loading countries...</div>;
+        } else {
+            const sortedCountries = [...this.props.list].sort(
+                (a, b) => (a.countryName < b.countryName ? -1 : 1)
+            );
+
+            return (
+                <div className="bordered">
+                    Country:&nbsp;
+                    <select
+                        onChange={this.onSelect}
+                        value={this.props.currentCountry}
+                    >
+                        <option value="">Select a country:</option>
+                        {sortedCountries.map(x => (
+                            <option
+                                key={x.countryCode}
+                                value={x.countryCode}
+                            >
+                                {x.countryName}
+                            </option>
+                        ))}
+                    </select>
+                </div>
+            );
+        }
+    }
+}

chapter13/src/regionsApp/countrySelect.connected.js

@@ -0,0 +1,22 @@
+/* @flow */
+
+import { connect } from "react-redux";
+
+import { CountrySelect } from "./countrySelect.component";
+import { getCountries, getRegions } from "./world.actions";
+
+const getProps = state => ({
+    list: state.countries,
+    currentCountry: state.currentCountry,
+    loading: state.loadingCountries
+});
+
+const getDispatch = (dispatch: any) => ({
+    getCountries: () => dispatch(getCountries()),
+    onSelect: c => dispatch(getRegions(c))
+});
+
+export const ConnectedCountrySelect = connect(
+    getProps,
+    getDispatch
+)(CountrySelect);

chapter13/src/regionsApp/index.js

@@ -0,0 +1,6 @@
+/* @flow */
+
+import { ConnectedCountrySelect } from "./countrySelect.connected.js";
+import { ConnectedRegionsTable } from "./regionsTableWithSave.connected.js";
+
+export { ConnectedCountrySelect, ConnectedRegionsTable };

chapter13/src/regionsApp/regionsTable.component.js

@@ -0,0 +1,44 @@
+/* @flow */
+
+import React from "react";
+import PropTypes from "prop-types";
+
+import "../general.css";
+
+export class RegionsTable extends React.PureComponent<{
+    loading: boolean,
+    list: Array<{
+        countryCode: string,
+        regionCode: string,
+        regionName: string
+    }>
+}> {
+    static propTypes = {
+        loading: PropTypes.bool.isRequired,
+        list: PropTypes.arrayOf(PropTypes.object).isRequired
+    };
+
+    static defaultProps = {
+        list: []
+    };
+
+    render() {
+        if (this.props.list.length === 0 || this.props.loading) {
+            return <div className="bordered">No regions.</div>;
+        } else {
+            const ordered = [...this.props.list].sort(
+                (a, b) => (a.regionName < b.regionName ? -1 : 1)
+            );
+
+            return (
+                <div className="bordered">
+                    {ordered.map(x => (
+                        <div key={x.countryCode + "-" + x.regionCode}>
+                            {x.regionName}
+                        </div>
+                    ))}
+                </div>
+            );
+        }
+    }
+}

chapter13/src/regionsApp/regionsTable.connected.js

@@ -0,0 +1,12 @@
+/* @flow */
+
+import { connect } from "react-redux";
+
+import { RegionsTable } from "./regionsTable.component";
+
+const getProps = state => ({
+    list: state.regions,
+    loading: state.loadingRegions
+});
+
+export const ConnectedRegionsTable = connect(getProps)(RegionsTable);

chapter13/src/regionsApp/regionsTableWithSave.component.js

@@ -0,0 +1,51 @@
+/* @flow */
+
+import React from "react";
+import PropTypes from "prop-types";
+
+import "../general.css";
+
+export class RegionsTable extends React.PureComponent<{
+    loading: boolean,
+    list: Array<{
+        countryCode: string,
+        regionCode: string,
+        regionName: string
+    }>,
+    saveRegions: () => void
+}> {
+    static propTypes = {
+        loading: PropTypes.bool.isRequired,
+        list: PropTypes.arrayOf(PropTypes.object).isRequired,
+        saveRegions: PropTypes.func.isRequired
+    };
+
+    static defaultProps = {
+        list: []
+    };
+
+    render() {
+        if (this.props.list.length === 0) {
+            return <div className="bordered">No regions.</div>;
+        } else {
+            const ordered = [...this.props.list].sort(
+                (a, b) => (a.regionName < b.regionName ? -1 : 1)
+            );
+
+            return (
+                <div className="bordered">
+                    {ordered.map(x => (
+                        <div key={x.countryCode + "-" + x.regionCode}>
+                            {x.regionName}
+                        </div>
+                    ))}
+                    <div>
+                        <button onClick={() => this.props.saveRegions()}>
+                            Save regions to disk
+                        </button>
+                    </div>
+                </div>
+            );
+        }
+    }
+}

chapter13/src/regionsApp/regionsTableWithSave.connected.js

@@ -0,0 +1,21 @@
+/* @flow */
+
+import { connect } from "react-redux";
+
+import { RegionsTable } from "./regionsTableWithSave.component";
+
+import { saveRegionsToDisk } from "./world.actions";
+
+const getProps = state => ({
+    list: state.regions,
+    loading: state.loadingRegions
+});
+
+const getDispatch = (dispatch: any) => ({
+    saveRegions: () => dispatch(saveRegionsToDisk())
+});
+
+export const ConnectedRegionsTable = connect(
+    getProps,
+    getDispatch
+)(RegionsTable);

chapter13/src/regionsApp/serviceApi.js

@@ -0,0 +1,38 @@
+/* @flow */
+
+const electron = window.require("electron").remote;
+
+// import axios from "axios";
+const axios = electron.require("axios");
+
+export const getCountriesAPI = () =>
+    axios.get(`http://192.168.1.200:8080/countries`);
+
+export const getRegionsAPI = (country: string) =>
+    axios.get(`http://192.168.1.200:8080/regions/${country}`);
+
+const fs = electron.require("fs");
+export const writeFile = fs.writeFile.bind(fs);
+
+/*
+    ANOTHER EXAMPLE - list the directory for the code in this book
+
+    const myDir = fs.readdirSync("/home/fkereki/JS_BOOK/modernjs");
+    console.log("Project dir:", myDir.filter(x => !x.startsWith(".")));
+*/
+
+export const showSaveDialog = electron.dialog.showSaveDialog;
+
+axios.originalGet = axios.get;
+axios.get = (uri, options, ...args) =>
+    axios.originalGet(uri, options, ...args).then(response => {
+        console.log(`GET ${uri}`, {
+            request: { uri, options, ...args },
+            response
+        });
+        return response;
+    });
+
+console.log("ELECTRON", electron);
+
+export const notifier = electron.require("node-notifier");

chapter13/src/regionsApp/store.js

@@ -0,0 +1,12 @@
+/* @flow */
+
+import { createStore, applyMiddleware } from "redux";
+import { composeWithDevTools } from "redux-devtools-extension";
+import thunk from "redux-thunk";
+
+import { reducer } from "./world.reducer";
+
+export const store = createStore(
+    reducer,
+    composeWithDevTools(applyMiddleware(thunk))
+);

chapter13/src/regionsApp/store.with.redux.devtools.js

@@ -0,0 +1,12 @@
+/* @flow */
+
+import { createStore, applyMiddleware } from "redux";
+import { composeWithDevTools } from "redux-devtools-extension";
+import thunk from "redux-thunk";
+
+import { reducer } from "./world.reducer";
+
+export const store = createStore(
+    reducer,
+    composeWithDevTools(applyMiddleware(thunk))
+);

chapter13/src/regionsApp/store.without.redux.devtools.js

@@ -0,0 +1,8 @@
+/* @flow */
+
+import { createStore, applyMiddleware } from "redux";
+import thunk from "redux-thunk";
+
+import { reducer } from "./world.reducer";
+
+export const store = createStore(reducer, applyMiddleware(thunk));

chapter13/src/regionsApp/world.actions.js

@@ -0,0 +1,115 @@
+/* @flow */
+
+import {
+    getCountriesAPI,
+    getRegionsAPI,
+    showSaveDialog,
+    writeFile,
+    notifier
+} from "./serviceApi";
+
+// Countries actions
+
+export const COUNTRIES_REQUEST = "countries:request";
+export const COUNTRIES_SUCCESS = "countries:success";
+export const COUNTRIES_FAILURE = "countries:failure";
+
+export type CountriesAction = {
+    type: string,
+    country?: string,
+    listOfCountries?: []
+};
+
+export const countriesRequest = () =>
+    ({
+        type: COUNTRIES_REQUEST
+    }: CountriesAction);
+
+export const countriesSuccess = (listOfCountries: []) =>
+    ({
+        type: COUNTRIES_SUCCESS,
+        listOfCountries
+    }: CountriesAction);
+
+export const countriesFailure = () =>
+    ({
+        type: COUNTRIES_FAILURE
+    }: CountriesAction);
+
+// Regions actions
+
+export const REGIONS_REQUEST = "regions:request";
+export const REGIONS_SUCCESS = "regions:success";
+export const REGIONS_FAILURE = "regions:failure";
+
+export type RegionsAction = {
+    type: string,
+    listOfRegions?: []
+};
+
+export const regionsRequest = (country: string) =>
+    ({
+        type: REGIONS_REQUEST,
+        country
+    }: RegionsAction);
+
+export const regionsSuccess = (listOfRegions: []) =>
+    ({
+        type: REGIONS_SUCCESS,
+        listOfRegions
+    }: RegionsAction);
+
+export const regionsFailure = () =>
+    ({
+        type: REGIONS_FAILURE
+    }: RegionsAction);
+
+// Complex Actions:
+
+export const getCountries = () => async (dispatch: ({}) => any) => {
+    try {
+        dispatch(countriesRequest());
+        // the next line delays execution for 5 seconds:
+        // await new Promise(resolve => setTimeout(resolve, 5000));
+        const result = await getCountriesAPI();
+        dispatch(countriesSuccess(result.data));
+    } catch (e) {
+        dispatch(countriesFailure());
+    }
+};
+
+export const getRegions = (country: string) => async (
+    dispatch: ({}) => any
+) => {
+    if (country) {
+        try {
+            dispatch(regionsRequest(country));
+            const result = await getRegionsAPI(country);
+            dispatch(regionsSuccess(result.data));
+        } catch (e) {
+            dispatch(regionsFailure());
+        }
+    } else {
+        dispatch(regionsFailure());
+    }
+};
+
+export const saveRegionsToDisk = () => async (
+    dispatch: ({}) => any,
+    getState: () => { regions: [] }
+) => {
+    showSaveDialog((filename: string = "") => {
+        if (filename) {
+            writeFile(filename, JSON.stringify(getState().regions), e => {
+                if (e) {
+                    window.console.log(`ERROR SAVING ${filename}!`, e);
+                } else {
+                    notifier.notify({
+                        title: "Regions app",
+                        message: `Regions saved to ${filename}`
+                    });
+                }
+            });
+        }
+    });
+};

chapter13/src/regionsApp/world.reducer.js

@@ -0,0 +1,72 @@
+/* @flow */
+
+import {
+    COUNTRIES_REQUEST,
+    COUNTRIES_SUCCESS,
+    COUNTRIES_FAILURE,
+    REGIONS_REQUEST,
+    REGIONS_SUCCESS,
+    REGIONS_FAILURE
+} from "./world.actions";
+
+import type { CountriesAction, RegionsAction } from "./world.actions";
+
+export const reducer = (
+    state: {} = {
+        // initial state
+        loadingCountries: false,
+        currentCountry: "",
+        countries: [],
+        loadingRegions: false,
+        regions: []
+    },
+    action: CountriesAction & RegionsAction
+) => {
+    switch (action.type) {
+        case COUNTRIES_REQUEST:
+            return {
+                ...state,
+                loadingCountries: true,
+                countries: []
+            };
+
+        case COUNTRIES_SUCCESS:
+            return {
+                ...state,
+                loadingCountries: false,
+                countries: action.listOfCountries
+            };
+
+        case COUNTRIES_FAILURE:
+            return {
+                ...state,
+                loadingCountries: false,
+                countries: []
+            };
+
+        case REGIONS_REQUEST:
+            return {
+                ...state,
+                loadingRegions: true,
+                currentCountry: action.country,
+                regions: []
+            };
+
+        case REGIONS_SUCCESS:
+            return {
+                ...state,
+                loadingRegions: false,
+                regions: action.listOfRegions
+            };
+
+        case REGIONS_FAILURE:
+            return {
+                ...state,
+                loadingRegions: false,
+                regions: []
+            };
+
+        default:
+            return state;
+    }
+};

chapter13/src/registerServiceWorker.js

@@ -0,0 +1,117 @@
+// In production, we register a service worker to serve assets from local cache.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on the "N+1" visit to a page, since previously
+// cached resources are updated in the background.
+
+// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
+// This link also includes instructions on opting out of this behavior.
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.1/8 is considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export default function register() {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Lets check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://goo.gl/SC7cgQ'
+          );
+        });
+      } else {
+        // Is not local host. Just register service worker
+        registerValidSW(swUrl);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the old content will have been purged and
+              // the fresh content will have been added to the cache.
+              // It's the perfect time to display a "New content is
+              // available; please refresh." message in your web app.
+              console.log('New content is available; please refresh.');
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl)
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      if (
+        response.status === 404 ||
+        response.headers.get('content-type').indexOf('javascript') === -1
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}

chapter13/uruguay_regions.txt

@@ -0,0 +1 @@
+[{"countryCode":"UY","regionCode":"1","regionName":"Artigas"},{"countryCode":"UY","regionCode":"10","regionName":"Montevideo"},{"countryCode":"UY","regionCode":"11","regionName":"Paysandú"},{"countryCode":"UY","regionCode":"12","regionName":"Rio Negro"},{"countryCode":"UY","regionCode":"13","regionName":"Rivera"},{"countryCode":"UY","regionCode":"14","regionName":"Rocha"},{"countryCode":"UY","regionCode":"15","regionName":"Salto"},{"countryCode":"UY","regionCode":"16","regionName":"San José"},{"countryCode":"UY","regionCode":"17","regionName":"Soriano"},{"countryCode":"UY","regionCode":"18","regionName":"Tacuarembo"},{"countryCode":"UY","regionCode":"19","regionName":"Treinta y Tres"},{"countryCode":"UY","regionCode":"2","regionName":"Canelones"},{"countryCode":"UY","regionCode":"3","regionName":"Cerro Largo"},{"countryCode":"UY","regionCode":"4","regionName":"Colonia"},{"countryCode":"UY","regionCode":"5","regionName":"Durazno"},{"countryCode":"UY","regionCode":"6","regionName":"Flores"},{"countryCode":"UY","regionCode":"7","regionName":"Florida"},{"countryCode":"UY","regionCode":"8","regionName":"Lavalleja"},{"countryCode":"UY","regionCode":"9","regionName":"Maldonado"}]