├── src
    ├── react-app-env.d.ts
    ├── App.css
    ├── types.ts
    ├── App.test.tsx
    ├── index.tsx
    ├── index.css
    ├── theme.ts
    ├── ThemeManager
    │   └── index.tsx
    ├── App.tsx
    ├── logo.svg
    └── serviceWorker.ts
├── public
    ├── favicon.ico
    ├── manifest.json
    └── index.html
├── .gitignore
├── tsconfig.json
├── README.md
└── package.json


/src/react-app-env.d.ts:
--------------------------------------------------------------------------------
1 | /// <reference types="react-scripts" />
2 | 


--------------------------------------------------------------------------------
/src/App.css:
--------------------------------------------------------------------------------
1 | .App-logo {
2 |   height: 40vmin;
3 |   pointer-events: none;
4 | }
5 | 


--------------------------------------------------------------------------------
/src/types.ts:
--------------------------------------------------------------------------------
1 | export interface ThemeContext {
2 |   mode: string,
3 |   toggle (): void;
4 | }
5 | 


--------------------------------------------------------------------------------
/public/favicon.ico:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/rossbulat/ts-react-theming-dark-mode/HEAD/public/favicon.ico


--------------------------------------------------------------------------------
/src/App.test.tsx:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import App from './App';
 4 | 
 5 | it('renders without crashing', () => {
 6 |   const div = document.createElement('div');
 7 |   ReactDOM.render(<App />, div);
 8 |   ReactDOM.unmountComponentAtNode(div);
 9 | });
10 | 


--------------------------------------------------------------------------------
/public/manifest.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     }
10 |   ],
11 |   "start_url": ".",
12 |   "display": "standalone",
13 |   "theme_color": "#000000",
14 |   "background_color": "#ffffff"
15 | }
16 | 


--------------------------------------------------------------------------------
/src/index.tsx:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import './index.css';
 4 | import App from './App';
 5 | import * as serviceWorker from './serviceWorker';
 6 | import { ThemeManager } from './ThemeManager';
 7 | 
 8 | ReactDOM.render(
 9 |   <ThemeManager>
10 |     <App />
11 |   </ThemeManager>
12 |   , document.getElementById('root'));
13 | 
14 | 
15 | serviceWorker.unregister();
16 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 2 | 
 3 | # dependencies
 4 | /node_modules
 5 | /.pnp
 6 | .pnp.js
 7 | 
 8 | # testing
 9 | /coverage
10 | 
11 | # production
12 | /build
13 | 
14 | # misc
15 | .DS_Store
16 | .env.local
17 | .env.development.local
18 | .env.test.local
19 | .env.production.local
20 | 
21 | npm-debug.log*
22 | yarn-debug.log*
23 | yarn-error.log*
24 | 


--------------------------------------------------------------------------------
/src/index.css:
--------------------------------------------------------------------------------
 1 | body {
 2 |   margin: 0;
 3 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 4 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 5 |     sans-serif;
 6 |   -webkit-font-smoothing: antialiased;
 7 |   -moz-osx-font-smoothing: grayscale;
 8 | }
 9 | 
10 | code {
11 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
12 |     monospace;
13 | }
14 | 


--------------------------------------------------------------------------------
/src/theme.ts:
--------------------------------------------------------------------------------
 1 | import theme from 'styled-theming';
 2 | 
 3 | export const backgroundColor: theme.ThemeSet = theme('mode', {
 4 |   light: '#fafafa',
 5 |   dark: '#0e0f11'
 6 | });
 7 | 
 8 | export const textColor: theme.ThemeSet = theme('mode', {
 9 |   light: '#191919',
10 |   dark: '#fafafa'
11 | });
12 | 
13 | export const buttonBackgroundColor = theme('mode', {
14 |   light: '#222',
15 |   dark: '#eee'
16 | });
17 | 
18 | export const buttonTextColor = theme('mode', {
19 |   light: '#eee',
20 |   dark: '#222'
21 | });
22 | 


--------------------------------------------------------------------------------
/tsconfig.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "compilerOptions": {
 3 |     "target": "es5",
 4 |     "lib": [
 5 |       "dom",
 6 |       "dom.iterable",
 7 |       "esnext"
 8 |     ],
 9 |     "allowJs": true,
10 |     "skipLibCheck": true,
11 |     "esModuleInterop": true,
12 |     "allowSyntheticDefaultImports": true,
13 |     "strict": true,
14 |     "forceConsistentCasingInFileNames": true,
15 |     "module": "esnext",
16 |     "moduleResolution": "node",
17 |     "resolveJsonModule": true,
18 |     "isolatedModules": true,
19 |     "noEmit": true,
20 |     "jsx": "preserve"
21 |   },
22 |   "include": [
23 |     "src"
24 |   ]
25 | }


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Typescript: React Dark Mode with Styled Theming and Context
2 | 
3 | ### This repository is an extension of my article Explaining dark mode integration with React, which can be found [here](https://medium.com/@rossbulat/react-dark-mode-with-styled-theming-and-context-57557de6400).
4 | 
5 | Dark mode is becoming more commonly supported in apps, both on the web and natively. 
6 | 
7 | React is in a great position to support such a feature, by leveraging features and packages readily available to be used with the framework. Toggling between a dark and light mode can be achieved very elegantly and modularly, as this repository demonstrates.
8 | 


--------------------------------------------------------------------------------
/src/ThemeManager/index.tsx:
--------------------------------------------------------------------------------
 1 | import React from "react";
 2 | import { ThemeContext } from '../types';
 3 | 
 4 | const defaultMode = 'dark';
 5 | 
 6 | export const ManageThemeContext: React.Context<ThemeContext> = React.createContext({
 7 |   mode: defaultMode,
 8 |   toggle: () => { }
 9 | });
10 | 
11 | export const useTheme = () => React.useContext(ManageThemeContext);
12 | 
13 | export const ThemeManager: React.FC = ({ children }) => {
14 | 
15 |   const [themeState, setThemeState] = React.useState({
16 |     mode: defaultMode
17 |   });
18 | 
19 |   const toggle = (): void => {
20 |     setThemeState({ mode: (themeState.mode === 'light' ? `dark` : `light`) });
21 |   }
22 | 
23 |   return (
24 |     <ManageThemeContext.Provider value={{
25 |       mode: themeState.mode,
26 |       toggle: toggle
27 |     }}>
28 |       {children}
29 |     </ManageThemeContext.Provider>
30 |   );
31 | }


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "ts-darkmode",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@types/jest": "24.0.15",
 7 |     "@types/node": "12.0.10",
 8 |     "@types/react": "16.8.22",
 9 |     "@types/react-dom": "16.8.4",
10 |     "@types/styled-components": "^4.1.16",
11 |     "@types/styled-theming": "^2.2.1",
12 |     "react": "^16.8.6",
13 |     "react-dom": "^16.8.6",
14 |     "react-scripts": "3.0.1",
15 |     "styled-components": "^4.3.2",
16 |     "styled-theming": "^2.2.0",
17 |     "typescript": "3.5.2"
18 |   },
19 |   "scripts": {
20 |     "start": "react-scripts start",
21 |     "build": "react-scripts build",
22 |     "test": "react-scripts test",
23 |     "eject": "react-scripts eject"
24 |   },
25 |   "eslintConfig": {
26 |     "extends": "react-app"
27 |   },
28 |   "browserslist": {
29 |     "production": [
30 |       ">0.2%",
31 |       "not dead",
32 |       "not op_mini all"
33 |     ],
34 |     "development": [
35 |       "last 1 chrome version",
36 |       "last 1 firefox version",
37 |       "last 1 safari version"
38 |     ]
39 |   }
40 | }
41 | 


--------------------------------------------------------------------------------
/src/App.tsx:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import logo from './logo.svg';
 3 | import './App.css';
 4 | import * as themeConf from './theme';
 5 | import styled, { ThemeProvider } from 'styled-components';
 6 | import { useTheme } from './ThemeManager';
 7 | 
 8 | const App: React.FC = () => {
 9 | 
10 |   const theme = useTheme();
11 | 
12 |   const Wrapper = styled.div`
13 |     background-color: ${themeConf.backgroundColor};
14 |     color: ${themeConf.textColor};
15 |     text-align: center;
16 |     min-height: 100vh;
17 |     display: flex;
18 |     flex-direction: column;
19 |     align-items: center;
20 |     justify-content: center;
21 |     font-size: calc(10px + 2vmin);
22 |   `;
23 | 
24 |   const Button = styled.button`
25 |     background: ${themeConf.buttonBackgroundColor};
26 |     border: none;
27 |     border-radius: 0.3em;
28 |     box-shadow: none;
29 |     color: ${themeConf.buttonTextColor};
30 |     cursor: pointer;
31 |     font-size: 1em;
32 |     padding: 0.5em 1em;
33 |   `;
34 | 
35 |   return (
36 |     <ThemeProvider theme={{ mode: theme.mode }}>
37 |       <Wrapper>
38 |         <img src={logo} className="App-logo" alt="logo" />
39 |         <p>
40 |           Edit <code>src/App.tsx</code> and save to reload.
41 |         </p>
42 |         <p>
43 |           <Button onClick={() => theme.toggle()}>
44 |             {theme.mode === 'dark' ? "Switch to Light Mode" : "Switch to Dark Mode"}
45 |           </Button>
46 |         </p>
47 |       </Wrapper>
48 |     </ThemeProvider>
49 |   );
50 | }
51 | 
52 | export default App;
53 | 


--------------------------------------------------------------------------------
/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 7 |     <meta name="theme-color" content="#000000" />
 8 |     <!--
 9 |       manifest.json provides metadata used when your web app is installed on a
10 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
11 |     -->
12 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
13 |     <!--
14 |       Notice the use of %PUBLIC_URL% in the tags above.
15 |       It will be replaced with the URL of the `public` folder during the build.
16 |       Only files inside the `public` folder can be referenced from the HTML.
17 | 
18 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
19 |       work correctly both with client-side routing and a non-root public URL.
20 |       Learn how to configure a non-root public URL by running `npm run build`.
21 |     -->
22 |     <title>React App</title>
23 |   </head>
24 |   <body>
25 |     <noscript>You need to enable JavaScript to run this app.</noscript>
26 |     <div id="root"></div>
27 |     <!--
28 |       This HTML file is a template.
29 |       If you open it directly in the browser, you will see an empty page.
30 | 
31 |       You can add webfonts, meta tags, or analytics to this file.
32 |       The build step will place the bundled scripts into the <body> tag.
33 | 
34 |       To begin the development, run `npm start` or `yarn start`.
35 |       To create a production bundle, use `npm run build` or `yarn build`.
36 |     -->
37 |   </body>
38 | </html>
39 | 


--------------------------------------------------------------------------------
/src/logo.svg:
--------------------------------------------------------------------------------
1 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
2 |     <g fill="#61DAFB">
3 |         <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"/>
4 |         <circle cx="420.9" cy="296.5" r="45.7"/>
5 |         <path d="M520.5 78.1z"/>
6 |     </g>
7 | </svg>
8 | 


--------------------------------------------------------------------------------
/src/serviceWorker.ts:
--------------------------------------------------------------------------------
  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read https://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.1/8 is considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | type Config = {
 24 |   onSuccess?: (registration: ServiceWorkerRegistration) => void;
 25 |   onUpdate?: (registration: ServiceWorkerRegistration) => void;
 26 | };
 27 | 
 28 | export function register(config?: Config) {
 29 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 30 |     // The URL constructor is available in all browsers that support SW.
 31 |     const publicUrl = new URL(
 32 |       (process as { env: { [key: string]: string } }).env.PUBLIC_URL,
 33 |       window.location.href
 34 |     );
 35 |     if (publicUrl.origin !== window.location.origin) {
 36 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 37 |       // from what our page is served on. This might happen if a CDN is used to
 38 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 39 |       return;
 40 |     }
 41 | 
 42 |     window.addEventListener('load', () => {
 43 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 44 | 
 45 |       if (isLocalhost) {
 46 |         // This is running on localhost. Let's check if a service worker still exists or not.
 47 |         checkValidServiceWorker(swUrl, config);
 48 | 
 49 |         // Add some additional logging to localhost, pointing developers to the
 50 |         // service worker/PWA documentation.
 51 |         navigator.serviceWorker.ready.then(() => {
 52 |           console.log(
 53 |             'This web app is being served cache-first by a service ' +
 54 |               'worker. To learn more, visit https://bit.ly/CRA-PWA'
 55 |           );
 56 |         });
 57 |       } else {
 58 |         // Is not localhost. Just register service worker
 59 |         registerValidSW(swUrl, config);
 60 |       }
 61 |     });
 62 |   }
 63 | }
 64 | 
 65 | function registerValidSW(swUrl: string, config?: Config) {
 66 |   navigator.serviceWorker
 67 |     .register(swUrl)
 68 |     .then(registration => {
 69 |       registration.onupdatefound = () => {
 70 |         const installingWorker = registration.installing;
 71 |         if (installingWorker == null) {
 72 |           return;
 73 |         }
 74 |         installingWorker.onstatechange = () => {
 75 |           if (installingWorker.state === 'installed') {
 76 |             if (navigator.serviceWorker.controller) {
 77 |               // At this point, the updated precached content has been fetched,
 78 |               // but the previous service worker will still serve the older
 79 |               // content until all client tabs are closed.
 80 |               console.log(
 81 |                 'New content is available and will be used when all ' +
 82 |                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
 83 |               );
 84 | 
 85 |               // Execute callback
 86 |               if (config && config.onUpdate) {
 87 |                 config.onUpdate(registration);
 88 |               }
 89 |             } else {
 90 |               // At this point, everything has been precached.
 91 |               // It's the perfect time to display a
 92 |               // "Content is cached for offline use." message.
 93 |               console.log('Content is cached for offline use.');
 94 | 
 95 |               // Execute callback
 96 |               if (config && config.onSuccess) {
 97 |                 config.onSuccess(registration);
 98 |               }
 99 |             }
100 |           }
101 |         };
102 |       };
103 |     })
104 |     .catch(error => {
105 |       console.error('Error during service worker registration:', error);
106 |     });
107 | }
108 | 
109 | function checkValidServiceWorker(swUrl: string, config?: Config) {
110 |   // Check if the service worker can be found. If it can't reload the page.
111 |   fetch(swUrl)
112 |     .then(response => {
113 |       // Ensure service worker exists, and that we really are getting a JS file.
114 |       const contentType = response.headers.get('content-type');
115 |       if (
116 |         response.status === 404 ||
117 |         (contentType != null && contentType.indexOf('javascript') === -1)
118 |       ) {
119 |         // No service worker found. Probably a different app. Reload the page.
120 |         navigator.serviceWorker.ready.then(registration => {
121 |           registration.unregister().then(() => {
122 |             window.location.reload();
123 |           });
124 |         });
125 |       } else {
126 |         // Service worker found. Proceed as normal.
127 |         registerValidSW(swUrl, config);
128 |       }
129 |     })
130 |     .catch(() => {
131 |       console.log(
132 |         'No internet connection found. App is running in offline mode.'
133 |       );
134 |     });
135 | }
136 | 
137 | export function unregister() {
138 |   if ('serviceWorker' in navigator) {
139 |     navigator.serviceWorker.ready.then(registration => {
140 |       registration.unregister();
141 |     });
142 |   }
143 | }
144 | 


--------------------------------------------------------------------------------