├── public
    ├── robots.txt
    ├── favicon.ico
    ├── logo192.png
    ├── logo512.png
    ├── manifest.json
    └── index.html
├── blocking.gif
├── non-blocking.gif
├── blocking-react.gif
├── non-blocking-react.gif
├── src
    ├── setupTests.ts
    ├── App.test.tsx
    ├── my-first-worker
    │   ├── index.ts
    │   └── tsconfig.json
    ├── index.css
    ├── index.tsx
    ├── App.css
    ├── takeALongTimeToDoSomething.ts
    ├── App.tsx
    ├── react-app-env.d.ts
    ├── App.hooks.ts
    ├── logo.svg
    └── serviceWorker.ts
├── config
    ├── jest
    │   ├── cssTransform.js
    │   └── fileTransform.js
    ├── pnpTs.js
    ├── paths.js
    ├── env.js
    ├── modules.js
    ├── webpackDevServer.config.js
    └── webpack.config.js
├── .gitignore
├── tsconfig.json
├── LICENSE
├── scripts
    ├── test.js
    ├── start.js
    └── build.js
├── README.md
├── package.json
└── BLOG.md


/public/robots.txt:
--------------------------------------------------------------------------------
1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | 


--------------------------------------------------------------------------------
/blocking.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/blocking.gif


--------------------------------------------------------------------------------
/non-blocking.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/non-blocking.gif


--------------------------------------------------------------------------------
/blocking-react.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/blocking-react.gif


--------------------------------------------------------------------------------
/public/favicon.ico:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/public/favicon.ico


--------------------------------------------------------------------------------
/public/logo192.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/public/logo192.png


--------------------------------------------------------------------------------
/public/logo512.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/public/logo512.png


--------------------------------------------------------------------------------
/non-blocking-react.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/johnnyreilly/webworkers-comlink-typescript-react/HEAD/non-blocking-react.gif


--------------------------------------------------------------------------------
/src/setupTests.ts:
--------------------------------------------------------------------------------
1 | // jest-dom adds custom jest matchers for asserting on DOM nodes.
2 | // allows you to do things like:
3 | // expect(element).toHaveTextContent(/react/i)
4 | // learn more: https://github.com/testing-library/jest-dom
5 | import '@testing-library/jest-dom/extend-expect';
6 | 


--------------------------------------------------------------------------------
/src/App.test.tsx:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { render } from '@testing-library/react';
 3 | import App from './App';
 4 | 
 5 | test('renders learn react link', () => {
 6 |   const { getByText } = render(<App />);
 7 |   const linkElement = getByText(/learn react/i);
 8 |   expect(linkElement).toBeInTheDocument();
 9 | });
10 | 


--------------------------------------------------------------------------------
/src/my-first-worker/index.ts:
--------------------------------------------------------------------------------
 1 | import { expose } from "comlink";
 2 | import {
 3 |   takeALongTimeToDoSomething,
 4 |   takeALongTimeToAddTwoNumbers
 5 | } from "../takeALongTimeToDoSomething";
 6 | 
 7 | const exports = {
 8 |   takeALongTimeToDoSomething,
 9 |   takeALongTimeToAddTwoNumbers
10 | };
11 | export type MyFirstWorker = typeof exports;
12 | 
13 | expose(exports);
14 | 


--------------------------------------------------------------------------------
/config/jest/cssTransform.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | // This is a custom Jest transformer turning style imports into empty objects.
 4 | // http://facebook.github.io/jest/docs/en/webpack.html
 5 | 
 6 | module.exports = {
 7 |   process() {
 8 |     return 'module.exports = {};';
 9 |   },
10 |   getCacheKey() {
11 |     // The output is always the same.
12 |     return 'cssTransform';
13 |   },
14 | };
15 | 


--------------------------------------------------------------------------------
/.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/my-first-worker/tsconfig.json:
--------------------------------------------------------------------------------
 1 | {
 2 |     "compileOnSave": false,
 3 |     "compilerOptions": {
 4 |       "strict": true,
 5 |       "target": "esnext",
 6 |       "module": "esnext",
 7 |       "lib": [
 8 |         "webworker",
 9 |         "esnext"
10 |       ],
11 |       "moduleResolution": "node",
12 |       "noUnusedLocals": true,
13 |       "sourceMap": true,
14 |       "allowJs": false,
15 |       "baseUrl": "."
16 |     }
17 |   }
18 |   


--------------------------------------------------------------------------------
/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 | 
 7 | ReactDOM.render(<App />, document.getElementById('root'));
 8 | 
 9 | // If you want your app to work offline and load faster, you can change
10 | // unregister() to register() below. Note this comes with some pitfalls.
11 | // Learn more about service workers: https://bit.ly/CRA-PWA
12 | serviceWorker.unregister();
13 | 
14 | 


--------------------------------------------------------------------------------
/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": "react"
21 |   },
22 |   "include": [
23 |     "src"
24 |   ]
25 | }
26 | 


--------------------------------------------------------------------------------
/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 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


--------------------------------------------------------------------------------
/src/App.css:
--------------------------------------------------------------------------------
 1 | .App {
 2 |   text-align: center;
 3 | }
 4 | 
 5 | .App-logo {
 6 |   height: 40vmin;
 7 |   pointer-events: none;
 8 | }
 9 | 
10 | @media (prefers-reduced-motion: no-preference) {
11 |   .App-logo {
12 |     animation: App-logo-spin infinite 20s linear;
13 |   }
14 | }
15 | 
16 | .App-header {
17 |   background-color: #282c34;
18 |   min-height: 100vh;
19 |   display: flex;
20 |   flex-direction: column;
21 |   align-items: center;
22 |   justify-content: center;
23 |   font-size: calc(10px + 2vmin);
24 |   color: white;
25 | }
26 | 
27 | .App-link {
28 |   color: #61dafb;
29 | }
30 | 
31 | @keyframes App-logo-spin {
32 |   from {
33 |     transform: rotate(0deg);
34 |   }
35 |   to {
36 |     transform: rotate(360deg);
37 |   }
38 | }
39 | 


--------------------------------------------------------------------------------
/config/pnpTs.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const { resolveModuleName } = require('ts-pnp');
 4 | 
 5 | exports.resolveModuleName = (
 6 |   typescript,
 7 |   moduleName,
 8 |   containingFile,
 9 |   compilerOptions,
10 |   resolutionHost
11 | ) => {
12 |   return resolveModuleName(
13 |     moduleName,
14 |     containingFile,
15 |     compilerOptions,
16 |     resolutionHost,
17 |     typescript.resolveModuleName
18 |   );
19 | };
20 | 
21 | exports.resolveTypeReferenceDirective = (
22 |   typescript,
23 |   moduleName,
24 |   containingFile,
25 |   compilerOptions,
26 |   resolutionHost
27 | ) => {
28 |   return resolveModuleName(
29 |     moduleName,
30 |     containingFile,
31 |     compilerOptions,
32 |     resolutionHost,
33 |     typescript.resolveTypeReferenceDirective
34 |   );
35 | };
36 | 


--------------------------------------------------------------------------------
/src/takeALongTimeToDoSomething.ts:
--------------------------------------------------------------------------------
 1 | export function takeALongTimeToDoSomething() {
 2 |     console.log('Start our long running job...');
 3 |     const seconds = 5;
 4 |     const start = new Date().getTime();
 5 |     const delay = seconds * 1000;
 6 |     while (true) {
 7 |         if ((new Date().getTime() - start) > delay) {
 8 |             break;
 9 |         }
10 |     }
11 |     console.log('Finished our long running job');
12 | }
13 | 
14 | export function takeALongTimeToAddTwoNumbers(number1: number, number2: number) {
15 |     console.log('Start to add...');
16 |     const seconds = 5;
17 |     const start = new Date().getTime();
18 |     const delay = seconds * 1000;
19 |     while (true) {
20 |         if ((new Date().getTime() - start) > delay) {
21 |             break;
22 |         }
23 |     }
24 |     const total = number1 + number2;
25 |     console.log('Finished adding');
26 |     return total;
27 | }


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 John Reilly
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/src/App.tsx:
--------------------------------------------------------------------------------
 1 | import React, { useState } from "react";
 2 | import "./App.css";
 3 | import { useTakeALongTimeToAddTwoNumbers } from "./App.hooks";
 4 | 
 5 | const App: React.FC = () => {
 6 |   const [number1, setNumber1] = useState(1);
 7 |   const [number2, setNumber2] = useState(2);
 8 | 
 9 |   const total = useTakeALongTimeToAddTwoNumbers(number1, number2);
10 | 
11 |   return (
12 |     <div className="App">
13 |       <h1>Web Workers in action!</h1>
14 | 
15 |       <div>
16 |         <label>Number to add: </label>
17 |         <input
18 |           type="number"
19 |           onChange={e => setNumber1(parseInt(e.target.value))}
20 |           value={number1}
21 |         />
22 |       </div>
23 |       <div>
24 |         <label>Number to add: </label>
25 |         <input
26 |           type="number"
27 |           onChange={e => setNumber2(parseInt(e.target.value))}
28 |           value={number2}
29 |         />
30 |       </div>
31 |       <h2>
32 |         Total:{" "}
33 |         {total.isCalculating ? (
34 |           <em>Calculating...</em>
35 |         ) : (
36 |           <strong>{total.total}</strong>
37 |         )}
38 |       </h2>
39 |     </div>
40 |   );
41 | };
42 | 
43 | export default App;
44 | 


--------------------------------------------------------------------------------
/config/jest/fileTransform.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const path = require('path');
 4 | const camelcase = require('camelcase');
 5 | 
 6 | // This is a custom Jest transformer turning file imports into filenames.
 7 | // http://facebook.github.io/jest/docs/en/webpack.html
 8 | 
 9 | module.exports = {
10 |   process(src, filename) {
11 |     const assetFilename = JSON.stringify(path.basename(filename));
12 | 
13 |     if (filename.match(/\.svg$/)) {
14 |       // Based on how SVGR generates a component name:
15 |       // https://github.com/smooth-code/svgr/blob/01b194cf967347d43d4cbe6b434404731b87cf27/packages/core/src/state.js#L6
16 |       const pascalCaseFilename = camelcase(path.parse(filename).name, {
17 |         pascalCase: true,
18 |       });
19 |       const componentName = `Svg${pascalCaseFilename}`;
20 |       return `const React = require('react');
21 |       module.exports = {
22 |         __esModule: true,
23 |         default: ${assetFilename},
24 |         ReactComponent: React.forwardRef(function ${componentName}(props, ref) {
25 |           return {
26 |             $$typeof: Symbol.for('react.element'),
27 |             type: 'svg',
28 |             ref: ref,
29 |             key: null,
30 |             props: Object.assign({}, props, {
31 |               children: ${assetFilename}
32 |             })
33 |           };
34 |         }),
35 |       };`;
36 |     }
37 | 
38 |     return `module.exports = ${assetFilename};`;
39 |   },
40 | };
41 | 


--------------------------------------------------------------------------------
/src/react-app-env.d.ts:
--------------------------------------------------------------------------------
 1 | /// <reference types="node" />
 2 | /// <reference types="react" />
 3 | /// <reference types="react-dom" />
 4 | 
 5 | declare namespace NodeJS {
 6 |   interface ProcessEnv {
 7 |     readonly NODE_ENV: 'development' | 'production' | 'test';
 8 |     readonly PUBLIC_URL: string;
 9 |   }
10 | }
11 | 
12 | declare module '*.bmp' {
13 |   const src: string;
14 |   export default src;
15 | }
16 | 
17 | declare module '*.gif' {
18 |   const src: string;
19 |   export default src;
20 | }
21 | 
22 | declare module '*.jpg' {
23 |   const src: string;
24 |   export default src;
25 | }
26 | 
27 | declare module '*.jpeg' {
28 |   const src: string;
29 |   export default src;
30 | }
31 | 
32 | declare module '*.png' {
33 |   const src: string;
34 |   export default src;
35 | }
36 | 
37 | declare module '*.webp' {
38 |     const src: string;
39 |     export default src;
40 | }
41 | 
42 | declare module '*.svg' {
43 |   import * as React from 'react';
44 | 
45 |   export const ReactComponent: React.FunctionComponent<React.SVGProps<SVGSVGElement>>;
46 | 
47 |   const src: string;
48 |   export default src;
49 | }
50 | 
51 | declare module '*.module.css' {
52 |   const classes: { readonly [key: string]: string };
53 |   export default classes;
54 | }
55 | 
56 | declare module '*.module.scss' {
57 |   const classes: { readonly [key: string]: string };
58 |   export default classes;
59 | }
60 | 
61 | declare module '*.module.sass' {
62 |   const classes: { readonly [key: string]: string };
63 |   export default classes;
64 | }
65 | 


--------------------------------------------------------------------------------
/scripts/test.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | // Do this as the first thing so that any code reading it knows the right env.
 4 | process.env.BABEL_ENV = 'test';
 5 | process.env.NODE_ENV = 'test';
 6 | process.env.PUBLIC_URL = '';
 7 | 
 8 | // Makes the script crash on unhandled rejections instead of silently
 9 | // ignoring them. In the future, promise rejections that are not handled will
10 | // terminate the Node.js process with a non-zero exit code.
11 | process.on('unhandledRejection', err => {
12 |   throw err;
13 | });
14 | 
15 | // Ensure environment variables are read.
16 | require('../config/env');
17 | 
18 | 
19 | const jest = require('jest');
20 | const execSync = require('child_process').execSync;
21 | let argv = process.argv.slice(2);
22 | 
23 | function isInGitRepository() {
24 |   try {
25 |     execSync('git rev-parse --is-inside-work-tree', { stdio: 'ignore' });
26 |     return true;
27 |   } catch (e) {
28 |     return false;
29 |   }
30 | }
31 | 
32 | function isInMercurialRepository() {
33 |   try {
34 |     execSync('hg --cwd . root', { stdio: 'ignore' });
35 |     return true;
36 |   } catch (e) {
37 |     return false;
38 |   }
39 | }
40 | 
41 | // Watch unless on CI or explicitly running all tests
42 | if (
43 |   !process.env.CI &&
44 |   argv.indexOf('--watchAll') === -1 &&
45 |   argv.indexOf('--watchAll=false') === -1
46 | ) {
47 |   // https://github.com/facebook/create-react-app/issues/5210
48 |   const hasSourceControl = isInGitRepository() || isInMercurialRepository();
49 |   argv.push(hasSourceControl ? '--watch' : '--watchAll');
50 | }
51 | 
52 | 
53 | jest.run(argv);
54 | 


--------------------------------------------------------------------------------
/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="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 |     <meta
 9 |       name="description"
10 |       content="Web site created using create-react-app"
11 |     />
12 |     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
13 |     <!--
14 |       manifest.json provides metadata used when your web app is installed on a
15 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
16 |     -->
17 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
18 |     <!--
19 |       Notice the use of %PUBLIC_URL% in the tags above.
20 |       It will be replaced with the URL of the `public` folder during the build.
21 |       Only files inside the `public` folder can be referenced from the HTML.
22 | 
23 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
24 |       work correctly both with client-side routing and a non-root public URL.
25 |       Learn how to configure a non-root public URL by running `npm run build`.
26 |     -->
27 |     <title>React App</title>
28 |   </head>
29 |   <body>
30 |     <noscript>You need to enable JavaScript to run this app.</noscript>
31 |     <div id="root"></div>
32 |     <!--
33 |       This HTML file is a template.
34 |       If you open it directly in the browser, you will see an empty page.
35 | 
36 |       You can add webfonts, meta tags, or analytics to this file.
37 |       The build step will place the bundled scripts into the <body> tag.
38 | 
39 |       To begin the development, run `npm start` or `yarn start`.
40 |       To create a production bundle, use `npm run build` or `yarn build`.
41 |     -->
42 |   </body>
43 | </html>
44 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
 2 | 
 3 | ## Available Scripts
 4 | 
 5 | In the project directory, you can run:
 6 | 
 7 | ### `yarn start`
 8 | 
 9 | Runs the app in the development mode.<br />
10 | Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
11 | 
12 | The page will reload if you make edits.<br />
13 | You will also see any lint errors in the console.
14 | 
15 | ### `yarn test`
16 | 
17 | Launches the test runner in the interactive watch mode.<br />
18 | See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
19 | 
20 | ### `yarn build`
21 | 
22 | Builds the app for production to the `build` folder.<br />
23 | It correctly bundles React in production mode and optimizes the build for the best performance.
24 | 
25 | The build is minified and the filenames include the hashes.<br />
26 | Your app is ready to be deployed!
27 | 
28 | See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
29 | 
30 | ### `yarn eject`
31 | 
32 | **Note: this is a one-way operation. Once you `eject`, you can’t go back!**
33 | 
34 | If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
35 | 
36 | Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
37 | 
38 | You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
39 | 
40 | ## Learn More
41 | 
42 | You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
43 | 
44 | To learn React, check out the [React documentation](https://reactjs.org/).
45 | 


--------------------------------------------------------------------------------
/src/App.hooks.ts:
--------------------------------------------------------------------------------
 1 | import { wrap, releaseProxy } from "comlink";
 2 | import { useEffect, useState, useMemo } from "react";
 3 | 
 4 | /**
 5 |  * Our hook that performs the calculation on the worker
 6 |  */
 7 | export function useTakeALongTimeToAddTwoNumbers(
 8 |   number1: number,
 9 |   number2: number
10 | ) {
11 |   // We'll want to expose a wrapping object so we know when a calculation is in progress
12 |   const [data, setData] = useState({
13 |     isCalculating: false,
14 |     total: undefined as number | undefined
15 |   });
16 | 
17 |   // acquire our worker
18 |   const { workerApi } = useWorker();
19 | 
20 |   useEffect(() => {
21 |     // We're starting the calculation here
22 |     setData({ isCalculating: true, total: undefined });
23 | 
24 |     workerApi
25 |       .takeALongTimeToAddTwoNumbers(number1, number2)
26 |       .then(total => setData({ isCalculating: false, total })); // We receive the result here
27 |   }, [workerApi, setData, number1, number2]);
28 | 
29 |   return data;
30 | }
31 | 
32 | function useWorker() {
33 |   // memoise a worker so it can be reused; create one worker up front
34 |   // and then reuse it subsequently; no creating new workers each time
35 |   const workerApiAndCleanup = useMemo(() => makeWorkerApiAndCleanup(), []);
36 | 
37 |   useEffect(() => {
38 |     const { cleanup } = workerApiAndCleanup;
39 | 
40 |     // cleanup our worker when we're done with it
41 |     return () => {
42 |       cleanup();
43 |     };
44 |   }, [workerApiAndCleanup]);
45 | 
46 |   return workerApiAndCleanup;
47 | }
48 | 
49 | /**
50 |  * Creates a worker, a cleanup function and returns it
51 |  */
52 | function makeWorkerApiAndCleanup() {
53 |   // Here we create our worker and wrap it with comlink so we can interact with it
54 |   const worker = new Worker("./my-first-worker", {
55 |     name: "my-first-worker",
56 |     type: "module"
57 |   });
58 |   const workerApi = wrap<import("./my-first-worker").MyFirstWorker>(worker);
59 | 
60 |   // A cleanup function that releases the comlink proxy and terminates the worker
61 |   const cleanup = () => {
62 |     workerApi[releaseProxy]();
63 |     worker.terminate();
64 |   };
65 | 
66 |   const workerApiAndCleanup = { workerApi, cleanup };
67 | 
68 |   return workerApiAndCleanup;
69 | }
70 | 


--------------------------------------------------------------------------------
/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 | 


--------------------------------------------------------------------------------
/config/paths.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const path = require('path');
 4 | const fs = require('fs');
 5 | const url = require('url');
 6 | 
 7 | // Make sure any symlinks in the project folder are resolved:
 8 | // https://github.com/facebook/create-react-app/issues/637
 9 | const appDirectory = fs.realpathSync(process.cwd());
10 | const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
11 | 
12 | const envPublicUrl = process.env.PUBLIC_URL;
13 | 
14 | function ensureSlash(inputPath, needsSlash) {
15 |   const hasSlash = inputPath.endsWith('/');
16 |   if (hasSlash && !needsSlash) {
17 |     return inputPath.substr(0, inputPath.length - 1);
18 |   } else if (!hasSlash && needsSlash) {
19 |     return `${inputPath}/`;
20 |   } else {
21 |     return inputPath;
22 |   }
23 | }
24 | 
25 | const getPublicUrl = appPackageJson =>
26 |   envPublicUrl || require(appPackageJson).homepage;
27 | 
28 | // We use `PUBLIC_URL` environment variable or "homepage" field to infer
29 | // "public path" at which the app is served.
30 | // Webpack needs to know it to put the right <script> hrefs into HTML even in
31 | // single-page apps that may serve index.html for nested URLs like /todos/42.
32 | // We can't use a relative path in HTML because we don't want to load something
33 | // like /todos/42/static/js/bundle.7289d.js. We have to know the root.
34 | function getServedPath(appPackageJson) {
35 |   const publicUrl = getPublicUrl(appPackageJson);
36 |   const servedUrl =
37 |     envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
38 |   return ensureSlash(servedUrl, true);
39 | }
40 | 
41 | const moduleFileExtensions = [
42 |   'web.mjs',
43 |   'mjs',
44 |   'web.js',
45 |   'js',
46 |   'web.ts',
47 |   'ts',
48 |   'web.tsx',
49 |   'tsx',
50 |   'json',
51 |   'web.jsx',
52 |   'jsx',
53 | ];
54 | 
55 | // Resolve file paths in the same order as webpack
56 | const resolveModule = (resolveFn, filePath) => {
57 |   const extension = moduleFileExtensions.find(extension =>
58 |     fs.existsSync(resolveFn(`${filePath}.${extension}`))
59 |   );
60 | 
61 |   if (extension) {
62 |     return resolveFn(`${filePath}.${extension}`);
63 |   }
64 | 
65 |   return resolveFn(`${filePath}.js`);
66 | };
67 | 
68 | // config after eject: we're in ./config/
69 | module.exports = {
70 |   dotenv: resolveApp('.env'),
71 |   appPath: resolveApp('.'),
72 |   appBuild: resolveApp('build'),
73 |   appPublic: resolveApp('public'),
74 |   appHtml: resolveApp('public/index.html'),
75 |   appIndexJs: resolveModule(resolveApp, 'src/index'),
76 |   appPackageJson: resolveApp('package.json'),
77 |   appSrc: resolveApp('src'),
78 |   appTsConfig: resolveApp('tsconfig.json'),
79 |   appJsConfig: resolveApp('jsconfig.json'),
80 |   yarnLockFile: resolveApp('yarn.lock'),
81 |   testsSetup: resolveModule(resolveApp, 'src/setupTests'),
82 |   proxySetup: resolveApp('src/setupProxy.js'),
83 |   appNodeModules: resolveApp('node_modules'),
84 |   publicUrl: getPublicUrl(resolveApp('package.json')),
85 |   servedPath: getServedPath(resolveApp('package.json')),
86 | };
87 | 
88 | 
89 | 
90 | module.exports.moduleFileExtensions = moduleFileExtensions;
91 | 


--------------------------------------------------------------------------------
/config/env.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const fs = require('fs');
 4 | const path = require('path');
 5 | const paths = require('./paths');
 6 | 
 7 | // Make sure that including paths.js after env.js will read .env variables.
 8 | delete require.cache[require.resolve('./paths')];
 9 | 
10 | const NODE_ENV = process.env.NODE_ENV;
11 | if (!NODE_ENV) {
12 |   throw new Error(
13 |     'The NODE_ENV environment variable is required but was not specified.'
14 |   );
15 | }
16 | 
17 | // https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
18 | const dotenvFiles = [
19 |   `${paths.dotenv}.${NODE_ENV}.local`,
20 |   `${paths.dotenv}.${NODE_ENV}`,
21 |   // Don't include `.env.local` for `test` environment
22 |   // since normally you expect tests to produce the same
23 |   // results for everyone
24 |   NODE_ENV !== 'test' && `${paths.dotenv}.local`,
25 |   paths.dotenv,
26 | ].filter(Boolean);
27 | 
28 | // Load environment variables from .env* files. Suppress warnings using silent
29 | // if this file is missing. dotenv will never modify any environment variables
30 | // that have already been set.  Variable expansion is supported in .env files.
31 | // https://github.com/motdotla/dotenv
32 | // https://github.com/motdotla/dotenv-expand
33 | dotenvFiles.forEach(dotenvFile => {
34 |   if (fs.existsSync(dotenvFile)) {
35 |     require('dotenv-expand')(
36 |       require('dotenv').config({
37 |         path: dotenvFile,
38 |       })
39 |     );
40 |   }
41 | });
42 | 
43 | // We support resolving modules according to `NODE_PATH`.
44 | // This lets you use absolute paths in imports inside large monorepos:
45 | // https://github.com/facebook/create-react-app/issues/253.
46 | // It works similar to `NODE_PATH` in Node itself:
47 | // https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
48 | // Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
49 | // Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
50 | // https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421
51 | // We also resolve them to make sure all tools using them work consistently.
52 | const appDirectory = fs.realpathSync(process.cwd());
53 | process.env.NODE_PATH = (process.env.NODE_PATH || '')
54 |   .split(path.delimiter)
55 |   .filter(folder => folder && !path.isAbsolute(folder))
56 |   .map(folder => path.resolve(appDirectory, folder))
57 |   .join(path.delimiter);
58 | 
59 | // Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
60 | // injected into the application via DefinePlugin in Webpack configuration.
61 | const REACT_APP = /^REACT_APP_/i;
62 | 
63 | function getClientEnvironment(publicUrl) {
64 |   const raw = Object.keys(process.env)
65 |     .filter(key => REACT_APP.test(key))
66 |     .reduce(
67 |       (env, key) => {
68 |         env[key] = process.env[key];
69 |         return env;
70 |       },
71 |       {
72 |         // Useful for determining whether we’re running in production mode.
73 |         // Most importantly, it switches React into the correct mode.
74 |         NODE_ENV: process.env.NODE_ENV || 'development',
75 |         // Useful for resolving the correct path to static assets in `public`.
76 |         // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
77 |         // This should only be used as an escape hatch. Normally you would put
78 |         // images into the `src` and `import` them in code to get their paths.
79 |         PUBLIC_URL: publicUrl,
80 |       }
81 |     );
82 |   // Stringify all values so we can feed into Webpack DefinePlugin
83 |   const stringified = {
84 |     'process.env': Object.keys(raw).reduce((env, key) => {
85 |       env[key] = JSON.stringify(raw[key]);
86 |       return env;
87 |     }, {}),
88 |   };
89 | 
90 |   return { raw, stringified };
91 | }
92 | 
93 | module.exports = getClientEnvironment;
94 | 


--------------------------------------------------------------------------------
/config/modules.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | const fs = require('fs');
  4 | const path = require('path');
  5 | const paths = require('./paths');
  6 | const chalk = require('react-dev-utils/chalk');
  7 | const resolve = require('resolve');
  8 | 
  9 | /**
 10 |  * Get additional module paths based on the baseUrl of a compilerOptions object.
 11 |  *
 12 |  * @param {Object} options
 13 |  */
 14 | function getAdditionalModulePaths(options = {}) {
 15 |   const baseUrl = options.baseUrl;
 16 | 
 17 |   // We need to explicitly check for null and undefined (and not a falsy value) because
 18 |   // TypeScript treats an empty string as `.`.
 19 |   if (baseUrl == null) {
 20 |     // If there's no baseUrl set we respect NODE_PATH
 21 |     // Note that NODE_PATH is deprecated and will be removed
 22 |     // in the next major release of create-react-app.
 23 | 
 24 |     const nodePath = process.env.NODE_PATH || '';
 25 |     return nodePath.split(path.delimiter).filter(Boolean);
 26 |   }
 27 | 
 28 |   const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
 29 | 
 30 |   // We don't need to do anything if `baseUrl` is set to `node_modules`. This is
 31 |   // the default behavior.
 32 |   if (path.relative(paths.appNodeModules, baseUrlResolved) === '') {
 33 |     return null;
 34 |   }
 35 | 
 36 |   // Allow the user set the `baseUrl` to `appSrc`.
 37 |   if (path.relative(paths.appSrc, baseUrlResolved) === '') {
 38 |     return [paths.appSrc];
 39 |   }
 40 | 
 41 |   // If the path is equal to the root directory we ignore it here.
 42 |   // We don't want to allow importing from the root directly as source files are
 43 |   // not transpiled outside of `src`. We do allow importing them with the
 44 |   // absolute path (e.g. `src/Components/Button.js`) but we set that up with
 45 |   // an alias.
 46 |   if (path.relative(paths.appPath, baseUrlResolved) === '') {
 47 |     return null;
 48 |   }
 49 | 
 50 |   // Otherwise, throw an error.
 51 |   throw new Error(
 52 |     chalk.red.bold(
 53 |       "Your project's `baseUrl` can only be set to `src` or `node_modules`." +
 54 |         ' Create React App does not support other values at this time.'
 55 |     )
 56 |   );
 57 | }
 58 | 
 59 | /**
 60 |  * Get webpack aliases based on the baseUrl of a compilerOptions object.
 61 |  *
 62 |  * @param {*} options
 63 |  */
 64 | function getWebpackAliases(options = {}) {
 65 |   const baseUrl = options.baseUrl;
 66 | 
 67 |   if (!baseUrl) {
 68 |     return {};
 69 |   }
 70 | 
 71 |   const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
 72 | 
 73 |   if (path.relative(paths.appPath, baseUrlResolved) === '') {
 74 |     return {
 75 |       src: paths.appSrc,
 76 |     };
 77 |   }
 78 | }
 79 | 
 80 | /**
 81 |  * Get jest aliases based on the baseUrl of a compilerOptions object.
 82 |  *
 83 |  * @param {*} options
 84 |  */
 85 | function getJestAliases(options = {}) {
 86 |   const baseUrl = options.baseUrl;
 87 | 
 88 |   if (!baseUrl) {
 89 |     return {};
 90 |   }
 91 | 
 92 |   const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
 93 | 
 94 |   if (path.relative(paths.appPath, baseUrlResolved) === '') {
 95 |     return {
 96 |       '^src/(.*)$': '<rootDir>/src/$1',
 97 |     };
 98 |   }
 99 | }
100 | 
101 | function getModules() {
102 |   // Check if TypeScript is setup
103 |   const hasTsConfig = fs.existsSync(paths.appTsConfig);
104 |   const hasJsConfig = fs.existsSync(paths.appJsConfig);
105 | 
106 |   if (hasTsConfig && hasJsConfig) {
107 |     throw new Error(
108 |       'You have both a tsconfig.json and a jsconfig.json. If you are using TypeScript please remove your jsconfig.json file.'
109 |     );
110 |   }
111 | 
112 |   let config;
113 | 
114 |   // If there's a tsconfig.json we assume it's a
115 |   // TypeScript project and set up the config
116 |   // based on tsconfig.json
117 |   if (hasTsConfig) {
118 |     const ts = require(resolve.sync('typescript', {
119 |       basedir: paths.appNodeModules,
120 |     }));
121 |     config = ts.readConfigFile(paths.appTsConfig, ts.sys.readFile).config;
122 |     // Otherwise we'll check if there is jsconfig.json
123 |     // for non TS projects.
124 |   } else if (hasJsConfig) {
125 |     config = require(paths.appJsConfig);
126 |   }
127 | 
128 |   config = config || {};
129 |   const options = config.compilerOptions || {};
130 | 
131 |   const additionalModulePaths = getAdditionalModulePaths(options);
132 | 
133 |   return {
134 |     additionalModulePaths: additionalModulePaths,
135 |     webpackAliases: getWebpackAliases(options),
136 |     jestAliases: getJestAliases(options),
137 |     hasTsConfig,
138 |   };
139 | }
140 | 
141 | module.exports = getModules();
142 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
  1 | {
  2 |   "name": "webworkers-comlink-typescript-react",
  3 |   "version": "0.1.0",
  4 |   "private": true,
  5 |   "dependencies": {
  6 |     "@babel/core": "7.7.4",
  7 |     "@svgr/webpack": "4.3.3",
  8 |     "@testing-library/jest-dom": "^4.2.4",
  9 |     "@testing-library/react": "^9.3.2",
 10 |     "@testing-library/user-event": "^7.1.2",
 11 |     "@types/jest": "^24.0.0",
 12 |     "@types/node": "^12.0.0",
 13 |     "@types/react": "^16.9.0",
 14 |     "@types/react-dom": "^16.9.0",
 15 |     "@typescript-eslint/eslint-plugin": "^2.8.0",
 16 |     "@typescript-eslint/parser": "^2.8.0",
 17 |     "babel-eslint": "10.0.3",
 18 |     "babel-jest": "^24.9.0",
 19 |     "babel-loader": "8.0.6",
 20 |     "babel-plugin-named-asset-import": "^0.3.5",
 21 |     "babel-preset-react-app": "^9.1.0",
 22 |     "camelcase": "^5.3.1",
 23 |     "case-sensitive-paths-webpack-plugin": "2.2.0",
 24 |     "comlink": "^4.2.0",
 25 |     "css-loader": "3.2.0",
 26 |     "dotenv": "8.2.0",
 27 |     "dotenv-expand": "5.1.0",
 28 |     "eslint": "^6.6.0",
 29 |     "eslint-config-react-app": "^5.1.0",
 30 |     "eslint-loader": "3.0.2",
 31 |     "eslint-plugin-flowtype": "3.13.0",
 32 |     "eslint-plugin-import": "2.18.2",
 33 |     "eslint-plugin-jsx-a11y": "6.2.3",
 34 |     "eslint-plugin-react": "7.16.0",
 35 |     "eslint-plugin-react-hooks": "^1.6.1",
 36 |     "file-loader": "4.3.0",
 37 |     "fork-ts-checker-webpack-plugin": "^4.0.0",
 38 |     "fs-extra": "^8.1.0",
 39 |     "html-webpack-plugin": "4.0.0-beta.5",
 40 |     "identity-obj-proxy": "3.0.0",
 41 |     "jest": "24.9.0",
 42 |     "jest-environment-jsdom-fourteen": "0.1.0",
 43 |     "jest-resolve": "24.9.0",
 44 |     "jest-watch-typeahead": "0.4.2",
 45 |     "mini-css-extract-plugin": "0.8.0",
 46 |     "optimize-css-assets-webpack-plugin": "5.0.3",
 47 |     "pnp-webpack-plugin": "1.5.0",
 48 |     "postcss-flexbugs-fixes": "4.1.0",
 49 |     "postcss-loader": "3.0.0",
 50 |     "postcss-normalize": "8.0.1",
 51 |     "postcss-preset-env": "6.7.0",
 52 |     "postcss-safe-parser": "4.0.1",
 53 |     "react": "^16.12.0",
 54 |     "react-app-polyfill": "^1.0.5",
 55 |     "react-dev-utils": "^11.0.4",
 56 |     "react-dom": "^16.12.0",
 57 |     "resolve": "1.12.2",
 58 |     "resolve-url-loader": "3.1.1",
 59 |     "sass-loader": "8.0.0",
 60 |     "semver": "6.3.0",
 61 |     "style-loader": "1.0.0",
 62 |     "terser-webpack-plugin": "2.2.1",
 63 |     "ts-pnp": "1.1.5",
 64 |     "typescript": "~3.7.2",
 65 |     "url-loader": "2.3.0",
 66 |     "webpack": "4.41.2",
 67 |     "webpack-dev-server": "3.9.0",
 68 |     "webpack-manifest-plugin": "2.2.0",
 69 |     "workbox-webpack-plugin": "4.3.1",
 70 |     "worker-plugin": "^3.2.0"
 71 |   },
 72 |   "scripts": {
 73 |     "start": "node scripts/start.js",
 74 |     "build": "node scripts/build.js",
 75 |     "test": "node scripts/test.js"
 76 |   },
 77 |   "eslintConfig": {
 78 |     "extends": "react-app"
 79 |   },
 80 |   "browserslist": {
 81 |     "production": [
 82 |       ">0.2%",
 83 |       "not dead",
 84 |       "not op_mini all"
 85 |     ],
 86 |     "development": [
 87 |       "last 1 chrome version",
 88 |       "last 1 firefox version",
 89 |       "last 1 safari version"
 90 |     ]
 91 |   },
 92 |   "jest": {
 93 |     "roots": [
 94 |       "<rootDir>/src"
 95 |     ],
 96 |     "collectCoverageFrom": [
 97 |       "src/**/*.{js,jsx,ts,tsx}",
 98 |       "!src/**/*.d.ts"
 99 |     ],
100 |     "setupFiles": [
101 |       "react-app-polyfill/jsdom"
102 |     ],
103 |     "setupFilesAfterEnv": [
104 |       "<rootDir>/src/setupTests.ts"
105 |     ],
106 |     "testMatch": [
107 |       "<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
108 |       "<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
109 |     ],
110 |     "testEnvironment": "jest-environment-jsdom-fourteen",
111 |     "transform": {
112 |       "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
113 |       "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
114 |       "^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
115 |     },
116 |     "transformIgnorePatterns": [
117 |       "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
118 |       "^.+\\.module\\.(css|sass|scss)$"
119 |     ],
120 |     "modulePaths": [],
121 |     "moduleNameMapper": {
122 |       "^react-native$": "react-native-web",
123 |       "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
124 |     },
125 |     "moduleFileExtensions": [
126 |       "web.js",
127 |       "js",
128 |       "web.ts",
129 |       "ts",
130 |       "web.tsx",
131 |       "tsx",
132 |       "json",
133 |       "web.jsx",
134 |       "jsx",
135 |       "node"
136 |     ],
137 |     "watchPlugins": [
138 |       "jest-watch-typeahead/filename",
139 |       "jest-watch-typeahead/testname"
140 |     ]
141 |   },
142 |   "babel": {
143 |     "presets": [
144 |       "react-app"
145 |     ]
146 |   }
147 | }
148 | 


--------------------------------------------------------------------------------
/scripts/start.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | // Do this as the first thing so that any code reading it knows the right env.
  4 | process.env.BABEL_ENV = 'development';
  5 | process.env.NODE_ENV = 'development';
  6 | 
  7 | // Makes the script crash on unhandled rejections instead of silently
  8 | // ignoring them. In the future, promise rejections that are not handled will
  9 | // terminate the Node.js process with a non-zero exit code.
 10 | process.on('unhandledRejection', err => {
 11 |   throw err;
 12 | });
 13 | 
 14 | // Ensure environment variables are read.
 15 | require('../config/env');
 16 | 
 17 | 
 18 | const fs = require('fs');
 19 | const chalk = require('react-dev-utils/chalk');
 20 | const webpack = require('webpack');
 21 | const WebpackDevServer = require('webpack-dev-server');
 22 | const clearConsole = require('react-dev-utils/clearConsole');
 23 | const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
 24 | const {
 25 |   choosePort,
 26 |   createCompiler,
 27 |   prepareProxy,
 28 |   prepareUrls,
 29 | } = require('react-dev-utils/WebpackDevServerUtils');
 30 | const openBrowser = require('react-dev-utils/openBrowser');
 31 | const paths = require('../config/paths');
 32 | const configFactory = require('../config/webpack.config');
 33 | const createDevServerConfig = require('../config/webpackDevServer.config');
 34 | 
 35 | const useYarn = fs.existsSync(paths.yarnLockFile);
 36 | const isInteractive = process.stdout.isTTY;
 37 | 
 38 | // Warn and crash if required files are missing
 39 | if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
 40 |   process.exit(1);
 41 | }
 42 | 
 43 | // Tools like Cloud9 rely on this.
 44 | const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
 45 | const HOST = process.env.HOST || '0.0.0.0';
 46 | 
 47 | if (process.env.HOST) {
 48 |   console.log(
 49 |     chalk.cyan(
 50 |       `Attempting to bind to HOST environment variable: ${chalk.yellow(
 51 |         chalk.bold(process.env.HOST)
 52 |       )}`
 53 |     )
 54 |   );
 55 |   console.log(
 56 |     `If this was unintentional, check that you haven't mistakenly set it in your shell.`
 57 |   );
 58 |   console.log(
 59 |     `Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`
 60 |   );
 61 |   console.log();
 62 | }
 63 | 
 64 | // We require that you explicitly set browsers and do not fall back to
 65 | // browserslist defaults.
 66 | const { checkBrowsers } = require('react-dev-utils/browsersHelper');
 67 | checkBrowsers(paths.appPath, isInteractive)
 68 |   .then(() => {
 69 |     // We attempt to use the default port but if it is busy, we offer the user to
 70 |     // run on a different port. `choosePort()` Promise resolves to the next free port.
 71 |     return choosePort(HOST, DEFAULT_PORT);
 72 |   })
 73 |   .then(port => {
 74 |     if (port == null) {
 75 |       // We have not found a port.
 76 |       return;
 77 |     }
 78 |     const config = configFactory('development');
 79 |     const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
 80 |     const appName = require(paths.appPackageJson).name;
 81 |     const useTypeScript = fs.existsSync(paths.appTsConfig);
 82 |     const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
 83 |     const urls = prepareUrls(protocol, HOST, port);
 84 |     const devSocket = {
 85 |       warnings: warnings =>
 86 |         devServer.sockWrite(devServer.sockets, 'warnings', warnings),
 87 |       errors: errors =>
 88 |         devServer.sockWrite(devServer.sockets, 'errors', errors),
 89 |     };
 90 |     // Create a webpack compiler that is configured with custom messages.
 91 |     const compiler = createCompiler({
 92 |       appName,
 93 |       config,
 94 |       devSocket,
 95 |       urls,
 96 |       useYarn,
 97 |       useTypeScript,
 98 |       tscCompileOnError,
 99 |       webpack,
100 |     });
101 |     // Load proxy config
102 |     const proxySetting = require(paths.appPackageJson).proxy;
103 |     const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
104 |     // Serve webpack assets generated by the compiler over a web server.
105 |     const serverConfig = createDevServerConfig(
106 |       proxyConfig,
107 |       urls.lanUrlForConfig
108 |     );
109 |     const devServer = new WebpackDevServer(compiler, serverConfig);
110 |     // Launch WebpackDevServer.
111 |     devServer.listen(port, HOST, err => {
112 |       if (err) {
113 |         return console.log(err);
114 |       }
115 |       if (isInteractive) {
116 |         clearConsole();
117 |       }
118 | 
119 |       // We used to support resolving modules according to `NODE_PATH`.
120 |       // This now has been deprecated in favor of jsconfig/tsconfig.json
121 |       // This lets you use absolute paths in imports inside large monorepos:
122 |       if (process.env.NODE_PATH) {
123 |         console.log(
124 |           chalk.yellow(
125 |             'Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.'
126 |           )
127 |         );
128 |         console.log();
129 |       }
130 | 
131 |       console.log(chalk.cyan('Starting the development server...\n'));
132 |       openBrowser(urls.localUrlForBrowser);
133 |     });
134 | 
135 |     ['SIGINT', 'SIGTERM'].forEach(function(sig) {
136 |       process.on(sig, function() {
137 |         devServer.close();
138 |         process.exit();
139 |       });
140 |     });
141 |   })
142 |   .catch(err => {
143 |     if (err && err.message) {
144 |       console.log(err.message);
145 |     }
146 |     process.exit(1);
147 |   });
148 | 


--------------------------------------------------------------------------------
/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 |     // 127.0.0.0/8 are 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}$/
 20 |     )
 21 | );
 22 | 
 23 | type Config = {
 24 |   onSuccess?: (registration: ServiceWorkerRegistration) => void;
 25 |   onUpdate?: (registration: ServiceWorkerRegistration) => void;
 26 | };
 27 | 
 28 | export function register(config?: Config) {
 29 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 30 |     // The URL constructor is available in all browsers that support SW.
 31 |     const publicUrl = new URL(
 32 |       process.env.PUBLIC_URL,
 33 |       window.location.href
 34 |     );
 35 |     if (publicUrl.origin !== window.location.origin) {
 36 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 37 |       // from what our page is served on. This might happen if a CDN is used to
 38 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 39 |       return;
 40 |     }
 41 | 
 42 |     window.addEventListener('load', () => {
 43 |       const swUrl = `${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 |     headers: { 'Service-Worker': 'script' }
113 |   })
114 |     .then(response => {
115 |       // Ensure service worker exists, and that we really are getting a JS file.
116 |       const contentType = response.headers.get('content-type');
117 |       if (
118 |         response.status === 404 ||
119 |         (contentType != null && contentType.indexOf('javascript') === -1)
120 |       ) {
121 |         // No service worker found. Probably a different app. Reload the page.
122 |         navigator.serviceWorker.ready.then(registration => {
123 |           registration.unregister().then(() => {
124 |             window.location.reload();
125 |           });
126 |         });
127 |       } else {
128 |         // Service worker found. Proceed as normal.
129 |         registerValidSW(swUrl, config);
130 |       }
131 |     })
132 |     .catch(() => {
133 |       console.log(
134 |         'No internet connection found. App is running in offline mode.'
135 |       );
136 |     });
137 | }
138 | 
139 | export function unregister() {
140 |   if ('serviceWorker' in navigator) {
141 |     navigator.serviceWorker.ready.then(registration => {
142 |       registration.unregister();
143 |     });
144 |   }
145 | }
146 | 


--------------------------------------------------------------------------------
/config/webpackDevServer.config.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
  4 | const evalSourceMapMiddleware = require('react-dev-utils/evalSourceMapMiddleware');
  5 | const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
  6 | const ignoredFiles = require('react-dev-utils/ignoredFiles');
  7 | const paths = require('./paths');
  8 | const fs = require('fs');
  9 | 
 10 | const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
 11 | const host = process.env.HOST || '0.0.0.0';
 12 | 
 13 | module.exports = function(proxy, allowedHost) {
 14 |   return {
 15 |     // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
 16 |     // websites from potentially accessing local content through DNS rebinding:
 17 |     // https://github.com/webpack/webpack-dev-server/issues/887
 18 |     // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
 19 |     // However, it made several existing use cases such as development in cloud
 20 |     // environment or subdomains in development significantly more complicated:
 21 |     // https://github.com/facebook/create-react-app/issues/2271
 22 |     // https://github.com/facebook/create-react-app/issues/2233
 23 |     // While we're investigating better solutions, for now we will take a
 24 |     // compromise. Since our WDS configuration only serves files in the `public`
 25 |     // folder we won't consider accessing them a vulnerability. However, if you
 26 |     // use the `proxy` feature, it gets more dangerous because it can expose
 27 |     // remote code execution vulnerabilities in backends like Django and Rails.
 28 |     // So we will disable the host check normally, but enable it if you have
 29 |     // specified the `proxy` setting. Finally, we let you override it if you
 30 |     // really know what you're doing with a special environment variable.
 31 |     disableHostCheck:
 32 |       !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true',
 33 |     // Enable gzip compression of generated files.
 34 |     compress: true,
 35 |     // Silence WebpackDevServer's own logs since they're generally not useful.
 36 |     // It will still show compile warnings and errors with this setting.
 37 |     clientLogLevel: 'none',
 38 |     // By default WebpackDevServer serves physical files from current directory
 39 |     // in addition to all the virtual build products that it serves from memory.
 40 |     // This is confusing because those files won’t automatically be available in
 41 |     // production build folder unless we copy them. However, copying the whole
 42 |     // project directory is dangerous because we may expose sensitive files.
 43 |     // Instead, we establish a convention that only files in `public` directory
 44 |     // get served. Our build script will copy `public` into the `build` folder.
 45 |     // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
 46 |     // <link rel="icon" href="%PUBLIC_URL%/favicon.ico">
 47 |     // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
 48 |     // Note that we only recommend to use `public` folder as an escape hatch
 49 |     // for files like `favicon.ico`, `manifest.json`, and libraries that are
 50 |     // for some reason broken when imported through Webpack. If you just want to
 51 |     // use an image, put it in `src` and `import` it from JavaScript instead.
 52 |     contentBase: paths.appPublic,
 53 |     // By default files from `contentBase` will not trigger a page reload.
 54 |     watchContentBase: true,
 55 |     // Enable hot reloading server. It will provide /sockjs-node/ endpoint
 56 |     // for the WebpackDevServer client so it can learn when the files were
 57 |     // updated. The WebpackDevServer client is included as an entry point
 58 |     // in the Webpack development configuration. Note that only changes
 59 |     // to CSS are currently hot reloaded. JS changes will refresh the browser.
 60 |     hot: true,
 61 |     // Use 'ws' instead of 'sockjs-node' on server since we're using native
 62 |     // websockets in `webpackHotDevClient`.
 63 |     transportMode: 'ws',
 64 |     // Prevent a WS client from getting injected as we're already including
 65 |     // `webpackHotDevClient`.
 66 |     injectClient: false,
 67 |     // It is important to tell WebpackDevServer to use the same "root" path
 68 |     // as we specified in the config. In development, we always serve from /.
 69 |     publicPath: '/',
 70 |     // WebpackDevServer is noisy by default so we emit custom message instead
 71 |     // by listening to the compiler events with `compiler.hooks[...].tap` calls above.
 72 |     quiet: true,
 73 |     // Reportedly, this avoids CPU overload on some systems.
 74 |     // https://github.com/facebook/create-react-app/issues/293
 75 |     // src/node_modules is not ignored to support absolute imports
 76 |     // https://github.com/facebook/create-react-app/issues/1065
 77 |     watchOptions: {
 78 |       ignored: ignoredFiles(paths.appSrc),
 79 |     },
 80 |     // Enable HTTPS if the HTTPS environment variable is set to 'true'
 81 |     https: protocol === 'https',
 82 |     host,
 83 |     overlay: false,
 84 |     historyApiFallback: {
 85 |       // Paths with dots should still use the history fallback.
 86 |       // See https://github.com/facebook/create-react-app/issues/387.
 87 |       disableDotRule: true,
 88 |     },
 89 |     public: allowedHost,
 90 |     proxy,
 91 |     before(app, server) {
 92 |       if (fs.existsSync(paths.proxySetup)) {
 93 |         // This registers user provided middleware for proxy reasons
 94 |         require(paths.proxySetup)(app);
 95 |       }
 96 | 
 97 |       // This lets us fetch source contents from webpack for the error overlay
 98 |       app.use(evalSourceMapMiddleware(server));
 99 |       // This lets us open files from the runtime error overlay.
100 |       app.use(errorOverlayMiddleware());
101 | 
102 |       // This service worker file is effectively a 'no-op' that will reset any
103 |       // previous service worker registered for the same host:port combination.
104 |       // We do this in development to avoid hitting the production cache if
105 |       // it used the same host and port.
106 |       // https://github.com/facebook/create-react-app/issues/2272#issuecomment-302832432
107 |       app.use(noopServiceWorkerMiddleware());
108 |     },
109 |   };
110 | };
111 | 


--------------------------------------------------------------------------------
/scripts/build.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | // Do this as the first thing so that any code reading it knows the right env.
  4 | process.env.BABEL_ENV = 'production';
  5 | process.env.NODE_ENV = 'production';
  6 | 
  7 | // Makes the script crash on unhandled rejections instead of silently
  8 | // ignoring them. In the future, promise rejections that are not handled will
  9 | // terminate the Node.js process with a non-zero exit code.
 10 | process.on('unhandledRejection', err => {
 11 |   throw err;
 12 | });
 13 | 
 14 | // Ensure environment variables are read.
 15 | require('../config/env');
 16 | 
 17 | 
 18 | const path = require('path');
 19 | const chalk = require('react-dev-utils/chalk');
 20 | const fs = require('fs-extra');
 21 | const webpack = require('webpack');
 22 | const configFactory = require('../config/webpack.config');
 23 | const paths = require('../config/paths');
 24 | const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
 25 | const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
 26 | const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
 27 | const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
 28 | const printBuildError = require('react-dev-utils/printBuildError');
 29 | 
 30 | const measureFileSizesBeforeBuild =
 31 |   FileSizeReporter.measureFileSizesBeforeBuild;
 32 | const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild;
 33 | const useYarn = fs.existsSync(paths.yarnLockFile);
 34 | 
 35 | // These sizes are pretty large. We'll warn for bundles exceeding them.
 36 | const WARN_AFTER_BUNDLE_GZIP_SIZE = 512 * 1024;
 37 | const WARN_AFTER_CHUNK_GZIP_SIZE = 1024 * 1024;
 38 | 
 39 | const isInteractive = process.stdout.isTTY;
 40 | 
 41 | // Warn and crash if required files are missing
 42 | if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
 43 |   process.exit(1);
 44 | }
 45 | 
 46 | // Generate configuration
 47 | const config = configFactory('production');
 48 | 
 49 | // We require that you explicitly set browsers and do not fall back to
 50 | // browserslist defaults.
 51 | const { checkBrowsers } = require('react-dev-utils/browsersHelper');
 52 | checkBrowsers(paths.appPath, isInteractive)
 53 |   .then(() => {
 54 |     // First, read the current file sizes in build directory.
 55 |     // This lets us display how much they changed later.
 56 |     return measureFileSizesBeforeBuild(paths.appBuild);
 57 |   })
 58 |   .then(previousFileSizes => {
 59 |     // Remove all content but keep the directory so that
 60 |     // if you're in it, you don't end up in Trash
 61 |     fs.emptyDirSync(paths.appBuild);
 62 |     // Merge with the public folder
 63 |     copyPublicFolder();
 64 |     // Start the webpack build
 65 |     return build(previousFileSizes);
 66 |   })
 67 |   .then(
 68 |     ({ stats, previousFileSizes, warnings }) => {
 69 |       if (warnings.length) {
 70 |         console.log(chalk.yellow('Compiled with warnings.\n'));
 71 |         console.log(warnings.join('\n\n'));
 72 |         console.log(
 73 |           '\nSearch for the ' +
 74 |             chalk.underline(chalk.yellow('keywords')) +
 75 |             ' to learn more about each warning.'
 76 |         );
 77 |         console.log(
 78 |           'To ignore, add ' +
 79 |             chalk.cyan('// eslint-disable-next-line') +
 80 |             ' to the line before.\n'
 81 |         );
 82 |       } else {
 83 |         console.log(chalk.green('Compiled successfully.\n'));
 84 |       }
 85 | 
 86 |       console.log('File sizes after gzip:\n');
 87 |       printFileSizesAfterBuild(
 88 |         stats,
 89 |         previousFileSizes,
 90 |         paths.appBuild,
 91 |         WARN_AFTER_BUNDLE_GZIP_SIZE,
 92 |         WARN_AFTER_CHUNK_GZIP_SIZE
 93 |       );
 94 |       console.log();
 95 | 
 96 |       const appPackage = require(paths.appPackageJson);
 97 |       const publicUrl = paths.publicUrl;
 98 |       const publicPath = config.output.publicPath;
 99 |       const buildFolder = path.relative(process.cwd(), paths.appBuild);
100 |       printHostingInstructions(
101 |         appPackage,
102 |         publicUrl,
103 |         publicPath,
104 |         buildFolder,
105 |         useYarn
106 |       );
107 |     },
108 |     err => {
109 |       const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
110 |       if (tscCompileOnError) {
111 |         console.log(
112 |           chalk.yellow(
113 |             'Compiled with the following type errors (you may want to check these before deploying your app):\n'
114 |           )
115 |         );
116 |         printBuildError(err);
117 |       } else {
118 |         console.log(chalk.red('Failed to compile.\n'));
119 |         printBuildError(err);
120 |         process.exit(1);
121 |       }
122 |     }
123 |   )
124 |   .catch(err => {
125 |     if (err && err.message) {
126 |       console.log(err.message);
127 |     }
128 |     process.exit(1);
129 |   });
130 | 
131 | // Create the production build and print the deployment instructions.
132 | function build(previousFileSizes) {
133 |   // We used to support resolving modules according to `NODE_PATH`.
134 |   // This now has been deprecated in favor of jsconfig/tsconfig.json
135 |   // This lets you use absolute paths in imports inside large monorepos:
136 |   if (process.env.NODE_PATH) {
137 |     console.log(
138 |       chalk.yellow(
139 |         'Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.'
140 |       )
141 |     );
142 |     console.log();
143 |   }
144 | 
145 |   console.log('Creating an optimized production build...');
146 | 
147 |   const compiler = webpack(config);
148 |   return new Promise((resolve, reject) => {
149 |     compiler.run((err, stats) => {
150 |       let messages;
151 |       if (err) {
152 |         if (!err.message) {
153 |           return reject(err);
154 |         }
155 | 
156 |         let errMessage = err.message;
157 | 
158 |         // Add additional information for postcss errors
159 |         if (Object.prototype.hasOwnProperty.call(err, 'postcssNode')) {
160 |           errMessage +=
161 |             '\nCompileError: Begins at CSS selector ' +
162 |             err['postcssNode'].selector;
163 |         }
164 | 
165 |         messages = formatWebpackMessages({
166 |           errors: [errMessage],
167 |           warnings: [],
168 |         });
169 |       } else {
170 |         messages = formatWebpackMessages(
171 |           stats.toJson({ all: false, warnings: true, errors: true })
172 |         );
173 |       }
174 |       if (messages.errors.length) {
175 |         // Only keep the first error. Others are often indicative
176 |         // of the same problem, but confuse the reader with noise.
177 |         if (messages.errors.length > 1) {
178 |           messages.errors.length = 1;
179 |         }
180 |         return reject(new Error(messages.errors.join('\n\n')));
181 |       }
182 |       if (
183 |         process.env.CI &&
184 |         (typeof process.env.CI !== 'string' ||
185 |           process.env.CI.toLowerCase() !== 'false') &&
186 |         messages.warnings.length
187 |       ) {
188 |         console.log(
189 |           chalk.yellow(
190 |             '\nTreating warnings as errors because process.env.CI = true.\n' +
191 |               'Most CI servers set it automatically.\n'
192 |           )
193 |         );
194 |         return reject(new Error(messages.warnings.join('\n\n')));
195 |       }
196 | 
197 |       return resolve({
198 |         stats,
199 |         previousFileSizes,
200 |         warnings: messages.warnings,
201 |       });
202 |     });
203 |   });
204 | }
205 | 
206 | function copyPublicFolder() {
207 |   fs.copySync(paths.appPublic, paths.appBuild, {
208 |     dereference: true,
209 |     filter: file => file !== paths.appHtml,
210 |   });
211 | }
212 | 


--------------------------------------------------------------------------------
/BLOG.md:
--------------------------------------------------------------------------------
  1 | # Web Workers, comlink, TypeScript and React
  2 | 
  3 | JavaScript is famously single threaded.  However, if you're developing for the web, you may well know that this is not quite accurate.  There are [`Web Workers`](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers):
  4 | 
  5 | > A worker is an object created using a constructor (e.g. `Worker()`) that runs a named JavaScript file — this file contains the code that will run in the worker thread; workers run in another global context that is different from the current window. 
  6 | 
  7 | Given that there is a way to use other threads for background processing, why doesn't this happen all the time? Well there's a number of reasons; not the least of which is the ceremony involved in interacting with Web Workers. Consider the following example that illustrates moving a calculation into a worker:
  8 | 
  9 | ```js
 10 | // main.js
 11 | function add2NumbersUsingWebWorker() {
 12 |     const myWorker = new Worker("worker.js");
 13 | 
 14 |     myWorker.postMessage([42, 7]);
 15 |     console.log('Message posted to worker');
 16 | 
 17 |     myWorker.onmessage = function(e) {
 18 |         console.log('Message received from worker', e.data);
 19 |     }
 20 | }
 21 | 
 22 | add2NumbersUsingWebWorker();
 23 | 
 24 | // worker.js
 25 | onmessage = function(e) {
 26 |   console.log('Worker: Message received from main script');
 27 |   const result = e.data[0] * e.data[1];
 28 |   if (isNaN(result)) {
 29 |     postMessage('Please write two numbers');
 30 |   } else {
 31 |     const workerResult = 'Result: ' + result;
 32 |     console.log('Worker: Posting message back to main script');
 33 |     postMessage(workerResult);
 34 |   }
 35 | }
 36 | ```
 37 | 
 38 | *This is not simple.*  It's hard to understand what's happening. Also, this approach only supports a single method call.  I'd much rather write something that looked more like this:
 39 | 
 40 | ```js
 41 | // main.js
 42 | function add2NumbersUsingWebWorker() {
 43 |     const myWorker = new Worker("worker.js");
 44 | 
 45 |     const total = myWorker.add2Numbers([42, 7]);
 46 |     console.log('Message received from worker', total);
 47 | }
 48 | 
 49 | add2NumbersUsingWebWorker();
 50 | 
 51 | // worker.js
 52 | export function add2Numbers(firstNumber, secondNumber) {
 53 |   const result = firstNumber + secondNumber;
 54 |   return (isNaN(result))
 55 |     ? 'Please write two numbers'
 56 |     : 'Result: ' + result;
 57 | }
 58 | ```
 59 | 
 60 | There's a way to do this using a library made by Google called [comlink](https://github.com/GoogleChromeLabs/comlink). This post will demonstrate how we can use this.  We'll use TypeScript and webpack.  We'll also examine how to integrate this approach into a React app.
 61 | 
 62 | #### A use case for a Web Worker
 63 | 
 64 | Let's make ourselves a TypeScript web app. We're going to use `create-react-app` for this:
 65 | 
 66 | ```shell
 67 | npx create-react-app webworkers-comlink-typescript-react --template typescript
 68 | ```
 69 | 
 70 | Create a `takeALongTimeToDoSomething.ts` file alongside `index.tsx`:
 71 | 
 72 | ```ts
 73 | export function takeALongTimeToDoSomething() {
 74 |     console.log('Start our long running job...');
 75 |     const seconds = 5;
 76 |     const start = new Date().getTime();
 77 |     const delay = seconds * 1000;
 78 | 
 79 |     while (true) {
 80 |         if ((new Date().getTime() - start) > delay) {
 81 |             break;
 82 |         }
 83 |     }
 84 |     console.log('Finished our long running job');
 85 | }
 86 | ```
 87 | 
 88 | To `index.tsx` add this code:
 89 | 
 90 | ```ts
 91 | import { takeALongTimeToDoSomething } from './takeALongTimeToDoSomething';
 92 | 
 93 | // ...
 94 | 
 95 | console.log('Do something');
 96 | takeALongTimeToDoSomething();
 97 | console.log('Do another thing');
 98 | ```
 99 | 
100 | When our application runs we see this behaviour:
101 | 
102 | ![a demo of blocking](blocking.gif)
103 | 
104 | The app starts and logs `Do something` and `Start our long running job...` to the console. It then blocks the UI until the `takeALongTimeToDoSomething` function has completed running.  During this time the screen is empty and unresponsive. This is a poor user experience.
105 | 
106 | #### Hello `worker-plugin` and `comlink`
107 | 
108 | To start using comlink we're going to need to eject our `create-react-app` application.  The way `create-react-app` works is by giving you a setup that handles a high percentage of the needs for a typical web app.  When you encounter an unsupported use case, you can run the `yarn eject` command to get direct access to the configuration of your setup. 
109 | 
110 | Web Workers are not that commonly used in day to day development at present. Consequently there isn't yet a "plug'n'play" solution for workers supported by `create-react-app`.  There's a number of potential ways to support this use case and you can track the various discussions happening against `create-react-app` that covers this.  For now, let's eject with:
111 | 
112 | ```
113 | yarn eject
114 | ```
115 | 
116 | Then let's install the packages we're going to be using:
117 | 
118 | - [`worker-plugin`](https://github.com/GoogleChromeLabs/worker-plugin) - this webpack plugin automatically compiles modules loaded in Web Workers
119 | - `comlink` - this library provides the RPC-like experience that we want from our workers
120 | 
121 | ```
122 | yarn add comlink worker-plugin
123 | ```
124 | 
125 | We now need to tweak our `webpack.config.js` to use the `worker-plugin`:
126 | 
127 | ```js
128 | const WorkerPlugin = require('worker-plugin');
129 | 
130 | // ....
131 | 
132 |     plugins: [
133 |       new WorkerPlugin(),
134 | 
135 | // ....
136 | 
137 | ```
138 | 
139 | Do note that there's a number of `plugins` statements in the `webpack.config.js`.  You want the top level one; look out for the `new HtmlWebpackPlugin` statement and place your `new WorkerPlugin(),` before that.
140 | 
141 | #### Workerize our slow process
142 | 
143 | Now we're ready to take our long running process and move it into a worker.  Inside the `src` folder, create a new folder called `my-first-worker`.  Our worker is going to live in here.  Into this folder we're going to add a `tsconfig.json` file:
144 | 
145 | ```
146 | {
147 |   "compilerOptions": {
148 |     "strict": true,
149 |     "target": "esnext",
150 |     "module": "esnext",
151 |     "lib": [
152 |       "webworker",
153 |       "esnext"
154 |     ],
155 |     "moduleResolution": "node",
156 |     "noUnusedLocals": true,
157 |     "sourceMap": true,
158 |     "allowJs": false,
159 |     "baseUrl": "."
160 |   }
161 | }
162 | ```
163 | 
164 | This file exists to tell TypeScript that this is a Web Worker.  Do note the `"lib": [ "webworker" ` usage which does exactly that. 
165 | 
166 | Alongside the `tsconfig.json` file, let's create an `index.ts` file.  This will be our worker:
167 | 
168 | ```ts
169 | import { expose } from 'comlink';
170 | import { takeALongTimeToDoSomething } from '../takeALongTimeToDoSomething';
171 | 
172 | const exports = {
173 |     takeALongTimeToDoSomething
174 | };
175 | export type MyFirstWorker = typeof exports;
176 | 
177 | expose(exports);
178 | ```
179 | 
180 | There's a number of things happening in our small worker file.  Let's go through this statement by statement:
181 | 
182 | ```ts
183 | import { expose } from 'comlink';
184 | ```
185 | 
186 | Here we're importing the `expose` method from comlink.  Comlink’s goal is to make *expose*d values from one thread available in the other.  The `expose` method can be viewed as the comlink equivalent of `export`. It is used to export the RPC style signature of our worker.  We'll see it's use later.
187 | 
188 | 
189 | ```ts
190 | import { takeALongTimeToDoSomething } from '../takeALongTimeToDoSomething';
191 | ```
192 | 
193 | Here we're going to import our `takeALongTimeToDoSomething` function that we wrote previously, so we can use it in our worker.
194 | 
195 | ```ts
196 | const exports = {
197 |     takeALongTimeToDoSomething
198 | };
199 | ```
200 | 
201 | Here we're creating the public facing API that we're going to expose.  
202 | 
203 | ```ts
204 | export type MyFirstWorker = typeof exports;
205 | ```
206 | 
207 | We're going to want our worker to be strongly typed.  This line creates a type called `MyFirstWorker` which is derived from our `exports` object literal.
208 | 
209 | ```ts
210 | expose(exports);
211 | ```
212 | 
213 | Finally we expose the `exports` using comlink.  We're done; that's our worker finished.  Now let's consume it.  Let's change our `index.tsx` file to use it.  Replace our import of `takeALongTimeToDoSomething`:
214 | 
215 | ```ts
216 | import { takeALongTimeToDoSomething } from './takeALongTimeToDoSomething';
217 | ```
218 | 
219 | With an import of `wrap` from comlink that creates a local `takeALongTimeToDoSomething` function that wraps interacting with our worker:
220 | 
221 | ```ts
222 | import { wrap } from 'comlink';
223 | 
224 | function takeALongTimeToDoSomething() {
225 |     const worker = new Worker('./my-first-worker', { name: 'my-first-worker', type: 'module' });
226 |     const workerApi = wrap<import('./my-first-worker').MyFirstWorker>(worker);
227 |     workerApi.takeALongTimeToDoSomething();    
228 | }
229 | ```
230 | 
231 | Now we're ready to demo our application using our function offloaded into a Web Worker. It now behaves like this:
232 | 
233 | ![a demo of non-blocking](non-blocking.gif)
234 | 
235 | There's a number of exciting things to note here:
236 | 
237 | 1. The application is now non-blocking.  Our long running function is now not preventing the UI from updating
238 | 2. The functionality is lazily loaded via a `my-first-worker.chunk.worker.js` that has been created by the `worker-plugin` and `comlink`.
239 | 
240 | #### Using Web Workers in React
241 | 
242 | The example we've showed so far demostrates how you could use Web Workers and why you might want to.  However, it's a far cry from a real world use case.  Let's take the next step and plug our Web Worker usage into our React application.  What would that look like?  Let's find out.
243 | 
244 | We'll return `index.tsx` back to it's initial state.  Then we'll make a simple adder function that takes some values and returns their total.  To our `takeALongTimeToDoSomething.ts` module let's add:
245 | 
246 | ```ts
247 | export function takeALongTimeToAddTwoNumbers(number1: number, number2: number) {
248 |     console.log('Start to add...');
249 |     const seconds = 5;
250 |     const start = new Date().getTime();
251 |     const delay = seconds * 1000;
252 |     while (true) {
253 |         if ((new Date().getTime() - start) > delay) {
254 |             break;
255 |         }
256 |     }
257 |     const total = number1 + number2;
258 |     console.log('Finished adding');
259 |     return total;
260 | }
261 | ```
262 | 
263 | Let's start using our long running calculator in a React component.  We'll update our `App.tsx` to use this function and create a simple adder component:
264 | 
265 | ```tsx
266 | import React, { useState } from "react";
267 | import "./App.css";
268 | import { takeALongTimeToAddTwoNumbers } from "./takeALongTimeToDoSomething";
269 | 
270 | const App: React.FC = () => {
271 |   const [number1, setNumber1] = useState(1);
272 |   const [number2, setNumber2] = useState(2);
273 | 
274 |   const total = takeALongTimeToAddTwoNumbers(number1, number2);
275 | 
276 |   return (
277 |     <div className="App">
278 |       <h1>Web Workers in action!</h1>
279 | 
280 |       <div>
281 |         <label>Number to add: </label>
282 |         <input
283 |           type="number"
284 |           onChange={e => setNumber1(parseInt(e.target.value))}
285 |           value={number1}
286 |         />
287 |       </div>
288 |       <div>
289 |         <label>Number to add: </label>
290 |         <input
291 |           type="number"
292 |           onChange={e => setNumber2(parseInt(e.target.value))}
293 |           value={number2}
294 |         />
295 |       </div>
296 |       <h2>Total: {total}</h2>
297 |     </div>
298 |   );
299 | };
300 | 
301 | export default App;
302 | ```
303 | 
304 | When you try it out you'll notice that entering a single digit locks the UI for 5 seconds whilst it adds the numbers. From the moment the cursor stops blinking to the moment the screen updates the UI is non-responsive:
305 | 
306 | ![blocking react](./blocking-react.gif)
307 | 
308 | So far, so classic. Let's Web Workerify this!
309 | 
310 | We'll update our `my-first-worker/index.ts` to import this new function:
311 | 
312 | ```ts
313 | import { expose } from "comlink";
314 | import {
315 |   takeALongTimeToDoSomething,
316 |   takeALongTimeToAddTwoNumbers
317 | } from "../takeALongTimeToDoSomething";
318 | 
319 | const exports = {
320 |   takeALongTimeToDoSomething,
321 |   takeALongTimeToAddTwoNumbers
322 | };
323 | export type MyFirstWorker = typeof exports;
324 | 
325 | expose(exports);
326 | ```
327 | 
328 | Alongside our `App.tsx` file let's create an `App.hooks.ts` file.
329 | 
330 | ```ts
331 | import { wrap, releaseProxy } from "comlink";
332 | import { useEffect, useState, useMemo } from "react";
333 | 
334 | /**
335 |  * Our hook that performs the calculation on the worker
336 |  */
337 | export function useTakeALongTimeToAddTwoNumbers(
338 |   number1: number,
339 |   number2: number
340 | ) {
341 |   // We'll want to expose a wrapping object so we know when a calculation is in progress
342 |   const [data, setData] = useState({
343 |     isCalculating: false,
344 |     total: undefined as number | undefined
345 |   });
346 | 
347 |   // acquire our worker
348 |   const { workerApi } = useWorker();
349 | 
350 |   useEffect(() => {
351 |     // We're starting the calculation here
352 |     setData({ isCalculating: true, total: undefined });
353 | 
354 |     workerApi
355 |       .takeALongTimeToAddTwoNumbers(number1, number2)
356 |       .then(total => setData({ isCalculating: false, total })); // We receive the result here
357 |   }, [workerApi, setData, number1, number2]);
358 | 
359 |   return data;
360 | }
361 | 
362 | function useWorker() {
363 |   // memoise a worker so it can be reused; create one worker up front
364 |   // and then reuse it subsequently; no creating new workers each time
365 |   const workerApiAndCleanup = useMemo(() => makeWorkerApiAndCleanup(), []);
366 | 
367 |   useEffect(() => {
368 |     const { cleanup } = workerApiAndCleanup;
369 | 
370 |     // cleanup our worker when we're done with it
371 |     return () => {
372 |       cleanup();
373 |     };
374 |   }, [workerApiAndCleanup]);
375 | 
376 |   return workerApiAndCleanup;
377 | }
378 | 
379 | /**
380 |  * Creates a worker, a cleanup function and returns it
381 |  */
382 | function makeWorkerApiAndCleanup() {
383 |   // Here we create our worker and wrap it with comlink so we can interact with it
384 |   const worker = new Worker("./my-first-worker", {
385 |     name: "my-first-worker",
386 |     type: "module"
387 |   });
388 |   const workerApi = wrap<import("./my-first-worker").MyFirstWorker>(worker);
389 | 
390 |   // A cleanup function that releases the comlink proxy and terminates the worker
391 |   const cleanup = () => {
392 |     workerApi[releaseProxy]();
393 |     worker.terminate();
394 |   };
395 | 
396 |   const workerApiAndCleanup = { workerApi, cleanup };
397 | 
398 |   return workerApiAndCleanup;
399 | }
400 | ```
401 | 
402 | The `useWorker` and `makeWorkerApiAndCleanup` functions make up the basis of a shareable worker hooks approach.  It would take very little work to paramaterise them so this could be used elsewhere.  That's outside the scope of this post but would be extremely straightforward to accomplish.
403 | 
404 | Time to test!  We'll change our `App.tsx` to use the new `useTakeALongTimeToAddTwoNumbers` hook:
405 | 
406 | ```tsx
407 | import React, { useState } from "react";
408 | import "./App.css";
409 | import { useTakeALongTimeToAddTwoNumbers } from "./App.hooks";
410 | 
411 | const App: React.FC = () => {
412 |   const [number1, setNumber1] = useState(1);
413 |   const [number2, setNumber2] = useState(2);
414 | 
415 |   const total = useTakeALongTimeToAddTwoNumbers(number1, number2);
416 | 
417 |   return (
418 |     <div className="App">
419 |       <h1>Web Workers in action!</h1>
420 | 
421 |       <div>
422 |         <label>Number to add: </label>
423 |         <input
424 |           type="number"
425 |           onChange={e => setNumber1(parseInt(e.target.value))}
426 |           value={number1}
427 |         />
428 |       </div>
429 |       <div>
430 |         <label>Number to add: </label>
431 |         <input
432 |           type="number"
433 |           onChange={e => setNumber2(parseInt(e.target.value))}
434 |           value={number2}
435 |         />
436 |       </div>
437 |       <h2>
438 |         Total:{" "}
439 |         {total.isCalculating ? (
440 |           <em>Calculating...</em>
441 |         ) : (
442 |           <strong>{total.total}</strong>
443 |         )}
444 |       </h2>
445 |     </div>
446 |   );
447 | };
448 | 
449 | export default App;
450 | ```
451 | 
452 | Now our calculation takes place off the main thread and the UI is no longer blocked!
453 | 
454 | ![non blocking react](./non-blocking-react.gif)
455 | 


--------------------------------------------------------------------------------
/config/webpack.config.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | const fs = require('fs');
  4 | const path = require('path');
  5 | const webpack = require('webpack');
  6 | const resolve = require('resolve');
  7 | const PnpWebpackPlugin = require('pnp-webpack-plugin');
  8 | const HtmlWebpackPlugin = require('html-webpack-plugin');
  9 | const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
 10 | const InlineChunkHtmlPlugin = require('react-dev-utils/InlineChunkHtmlPlugin');
 11 | const TerserPlugin = require('terser-webpack-plugin');
 12 | const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 13 | const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 14 | const safePostCssParser = require('postcss-safe-parser');
 15 | const ManifestPlugin = require('webpack-manifest-plugin');
 16 | const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
 17 | const WorkboxWebpackPlugin = require('workbox-webpack-plugin');
 18 | const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
 19 | const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
 20 | const getCSSModuleLocalIdent = require('react-dev-utils/getCSSModuleLocalIdent');
 21 | const paths = require('./paths');
 22 | const modules = require('./modules');
 23 | const getClientEnvironment = require('./env');
 24 | const ModuleNotFoundPlugin = require('react-dev-utils/ModuleNotFoundPlugin');
 25 | const ForkTsCheckerWebpackPlugin = require('react-dev-utils/ForkTsCheckerWebpackPlugin');
 26 | const typescriptFormatter = require('react-dev-utils/typescriptFormatter');
 27 | const WorkerPlugin = require('worker-plugin');
 28 | 
 29 | const postcssNormalize = require('postcss-normalize');
 30 | 
 31 | const appPackageJson = require(paths.appPackageJson);
 32 | 
 33 | // Source maps are resource heavy and can cause out of memory issue for large source files.
 34 | const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== 'false';
 35 | // Some apps do not need the benefits of saving a web request, so not inlining the chunk
 36 | // makes for a smoother build process.
 37 | const shouldInlineRuntimeChunk = process.env.INLINE_RUNTIME_CHUNK !== 'false';
 38 | 
 39 | const imageInlineSizeLimit = parseInt(
 40 |   process.env.IMAGE_INLINE_SIZE_LIMIT || '10000'
 41 | );
 42 | 
 43 | // Check if TypeScript is setup
 44 | const useTypeScript = fs.existsSync(paths.appTsConfig);
 45 | 
 46 | // style files regexes
 47 | const cssRegex = /\.css$/;
 48 | const cssModuleRegex = /\.module\.css$/;
 49 | const sassRegex = /\.(scss|sass)$/;
 50 | const sassModuleRegex = /\.module\.(scss|sass)$/;
 51 | 
 52 | // This is the production and development configuration.
 53 | // It is focused on developer experience, fast rebuilds, and a minimal bundle.
 54 | module.exports = function(webpackEnv) {
 55 |   const isEnvDevelopment = webpackEnv === 'development';
 56 |   const isEnvProduction = webpackEnv === 'production';
 57 | 
 58 |   // Variable used for enabling profiling in Production
 59 |   // passed into alias object. Uses a flag if passed into the build command
 60 |   const isEnvProductionProfile =
 61 |     isEnvProduction && process.argv.includes('--profile');
 62 | 
 63 |   // Webpack uses `publicPath` to determine where the app is being served from.
 64 |   // It requires a trailing slash, or the file assets will get an incorrect path.
 65 |   // In development, we always serve from the root. This makes config easier.
 66 |   const publicPath = isEnvProduction
 67 |     ? paths.servedPath
 68 |     : isEnvDevelopment && '/';
 69 |   // Some apps do not use client-side routing with pushState.
 70 |   // For these, "homepage" can be set to "." to enable relative asset paths.
 71 |   const shouldUseRelativeAssetPaths = publicPath === './';
 72 | 
 73 |   // `publicUrl` is just like `publicPath`, but we will provide it to our app
 74 |   // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
 75 |   // Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
 76 |   const publicUrl = isEnvProduction
 77 |     ? publicPath.slice(0, -1)
 78 |     : isEnvDevelopment && '';
 79 |   // Get environment variables to inject into our app.
 80 |   const env = getClientEnvironment(publicUrl);
 81 | 
 82 |   // common function to get style loaders
 83 |   const getStyleLoaders = (cssOptions, preProcessor) => {
 84 |     const loaders = [
 85 |       isEnvDevelopment && require.resolve('style-loader'),
 86 |       isEnvProduction && {
 87 |         loader: MiniCssExtractPlugin.loader,
 88 |         options: shouldUseRelativeAssetPaths ? { publicPath: '../../' } : {},
 89 |       },
 90 |       {
 91 |         loader: require.resolve('css-loader'),
 92 |         options: cssOptions,
 93 |       },
 94 |       {
 95 |         // Options for PostCSS as we reference these options twice
 96 |         // Adds vendor prefixing based on your specified browser support in
 97 |         // package.json
 98 |         loader: require.resolve('postcss-loader'),
 99 |         options: {
100 |           // Necessary for external CSS imports to work
101 |           // https://github.com/facebook/create-react-app/issues/2677
102 |           ident: 'postcss',
103 |           plugins: () => [
104 |             require('postcss-flexbugs-fixes'),
105 |             require('postcss-preset-env')({
106 |               autoprefixer: {
107 |                 flexbox: 'no-2009',
108 |               },
109 |               stage: 3,
110 |             }),
111 |             // Adds PostCSS Normalize as the reset css with default options,
112 |             // so that it honors browserslist config in package.json
113 |             // which in turn let's users customize the target behavior as per their needs.
114 |             postcssNormalize(),
115 |           ],
116 |           sourceMap: isEnvProduction && shouldUseSourceMap,
117 |         },
118 |       },
119 |     ].filter(Boolean);
120 |     if (preProcessor) {
121 |       loaders.push(
122 |         {
123 |           loader: require.resolve('resolve-url-loader'),
124 |           options: {
125 |             sourceMap: isEnvProduction && shouldUseSourceMap,
126 |           },
127 |         },
128 |         {
129 |           loader: require.resolve(preProcessor),
130 |           options: {
131 |             sourceMap: true,
132 |           },
133 |         }
134 |       );
135 |     }
136 |     return loaders;
137 |   };
138 | 
139 |   return {
140 |     mode: isEnvProduction ? 'production' : isEnvDevelopment && 'development',
141 |     // Stop compilation early in production
142 |     bail: isEnvProduction,
143 |     devtool: isEnvProduction
144 |       ? shouldUseSourceMap
145 |         ? 'source-map'
146 |         : false
147 |       : isEnvDevelopment && 'cheap-module-source-map',
148 |     // These are the "entry points" to our application.
149 |     // This means they will be the "root" imports that are included in JS bundle.
150 |     entry: [
151 |       // Include an alternative client for WebpackDevServer. A client's job is to
152 |       // connect to WebpackDevServer by a socket and get notified about changes.
153 |       // When you save a file, the client will either apply hot updates (in case
154 |       // of CSS changes), or refresh the page (in case of JS changes). When you
155 |       // make a syntax error, this client will display a syntax error overlay.
156 |       // Note: instead of the default WebpackDevServer client, we use a custom one
157 |       // to bring better experience for Create React App users. You can replace
158 |       // the line below with these two lines if you prefer the stock client:
159 |       // require.resolve('webpack-dev-server/client') + '?/',
160 |       // require.resolve('webpack/hot/dev-server'),
161 |       isEnvDevelopment &&
162 |         require.resolve('react-dev-utils/webpackHotDevClient'),
163 |       // Finally, this is your app's code:
164 |       paths.appIndexJs,
165 |       // We include the app code last so that if there is a runtime error during
166 |       // initialization, it doesn't blow up the WebpackDevServer client, and
167 |       // changing JS code would still trigger a refresh.
168 |     ].filter(Boolean),
169 |     output: {
170 |       // The build folder.
171 |       path: isEnvProduction ? paths.appBuild : undefined,
172 |       // Add /* filename */ comments to generated require()s in the output.
173 |       pathinfo: isEnvDevelopment,
174 |       // There will be one main bundle, and one file per asynchronous chunk.
175 |       // In development, it does not produce real files.
176 |       filename: isEnvProduction
177 |         ? 'static/js/[name].[contenthash:8].js'
178 |         : isEnvDevelopment && 'static/js/bundle.js',
179 |       // TODO: remove this when upgrading to webpack 5
180 |       futureEmitAssets: true,
181 |       // There are also additional JS chunk files if you use code splitting.
182 |       chunkFilename: isEnvProduction
183 |         ? 'static/js/[name].[contenthash:8].chunk.js'
184 |         : isEnvDevelopment && 'static/js/[name].chunk.js',
185 |       // We inferred the "public path" (such as / or /my-project) from homepage.
186 |       // We use "/" in development.
187 |       publicPath: publicPath,
188 |       // Point sourcemap entries to original disk location (format as URL on Windows)
189 |       devtoolModuleFilenameTemplate: isEnvProduction
190 |         ? info =>
191 |             path
192 |               .relative(paths.appSrc, info.absoluteResourcePath)
193 |               .replace(/\\/g, '/')
194 |         : isEnvDevelopment &&
195 |           (info => path.resolve(info.absoluteResourcePath).replace(/\\/g, '/')),
196 |       // Prevents conflicts when multiple Webpack runtimes (from different apps)
197 |       // are used on the same page.
198 |       jsonpFunction: `webpackJsonp${appPackageJson.name}`,
199 |       // this defaults to 'window', but by setting it to 'this' then
200 |       // module chunks which are built will work in web workers as well.
201 |       globalObject: 'this',
202 |     },
203 |     optimization: {
204 |       minimize: isEnvProduction,
205 |       minimizer: [
206 |         // This is only used in production mode
207 |         new TerserPlugin({
208 |           terserOptions: {
209 |             parse: {
210 |               // We want terser to parse ecma 8 code. However, we don't want it
211 |               // to apply any minification steps that turns valid ecma 5 code
212 |               // into invalid ecma 5 code. This is why the 'compress' and 'output'
213 |               // sections only apply transformations that are ecma 5 safe
214 |               // https://github.com/facebook/create-react-app/pull/4234
215 |               ecma: 8,
216 |             },
217 |             compress: {
218 |               ecma: 5,
219 |               warnings: false,
220 |               // Disabled because of an issue with Uglify breaking seemingly valid code:
221 |               // https://github.com/facebook/create-react-app/issues/2376
222 |               // Pending further investigation:
223 |               // https://github.com/mishoo/UglifyJS2/issues/2011
224 |               comparisons: false,
225 |               // Disabled because of an issue with Terser breaking valid code:
226 |               // https://github.com/facebook/create-react-app/issues/5250
227 |               // Pending further investigation:
228 |               // https://github.com/terser-js/terser/issues/120
229 |               inline: 2,
230 |             },
231 |             mangle: {
232 |               safari10: true,
233 |             },
234 |             // Added for profiling in devtools
235 |             keep_classnames: isEnvProductionProfile,
236 |             keep_fnames: isEnvProductionProfile,
237 |             output: {
238 |               ecma: 5,
239 |               comments: false,
240 |               // Turned on because emoji and regex is not minified properly using default
241 |               // https://github.com/facebook/create-react-app/issues/2488
242 |               ascii_only: true,
243 |             },
244 |           },
245 |           sourceMap: shouldUseSourceMap,
246 |         }),
247 |         // This is only used in production mode
248 |         new OptimizeCSSAssetsPlugin({
249 |           cssProcessorOptions: {
250 |             parser: safePostCssParser,
251 |             map: shouldUseSourceMap
252 |               ? {
253 |                   // `inline: false` forces the sourcemap to be output into a
254 |                   // separate file
255 |                   inline: false,
256 |                   // `annotation: true` appends the sourceMappingURL to the end of
257 |                   // the css file, helping the browser find the sourcemap
258 |                   annotation: true,
259 |                 }
260 |               : false,
261 |           },
262 |         }),
263 |       ],
264 |       // Automatically split vendor and commons
265 |       // https://twitter.com/wSokra/status/969633336732905474
266 |       // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
267 |       splitChunks: {
268 |         chunks: 'all',
269 |         name: false,
270 |       },
271 |       // Keep the runtime chunk separated to enable long term caching
272 |       // https://twitter.com/wSokra/status/969679223278505985
273 |       // https://github.com/facebook/create-react-app/issues/5358
274 |       runtimeChunk: {
275 |         name: entrypoint => `runtime-${entrypoint.name}`,
276 |       },
277 |     },
278 |     resolve: {
279 |       // This allows you to set a fallback for where Webpack should look for modules.
280 |       // We placed these paths second because we want `node_modules` to "win"
281 |       // if there are any conflicts. This matches Node resolution mechanism.
282 |       // https://github.com/facebook/create-react-app/issues/253
283 |       modules: ['node_modules', paths.appNodeModules].concat(
284 |         modules.additionalModulePaths || []
285 |       ),
286 |       // These are the reasonable defaults supported by the Node ecosystem.
287 |       // We also include JSX as a common component filename extension to support
288 |       // some tools, although we do not recommend using it, see:
289 |       // https://github.com/facebook/create-react-app/issues/290
290 |       // `web` extension prefixes have been added for better support
291 |       // for React Native Web.
292 |       extensions: paths.moduleFileExtensions
293 |         .map(ext => `.${ext}`)
294 |         .filter(ext => useTypeScript || !ext.includes('ts')),
295 |       alias: {
296 |         // Support React Native Web
297 |         // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
298 |         'react-native': 'react-native-web',
299 |         // Allows for better profiling with ReactDevTools
300 |         ...(isEnvProductionProfile && {
301 |           'react-dom$': 'react-dom/profiling',
302 |           'scheduler/tracing': 'scheduler/tracing-profiling',
303 |         }),
304 |         ...(modules.webpackAliases || {}),
305 |       },
306 |       plugins: [
307 |         // Adds support for installing with Plug'n'Play, leading to faster installs and adding
308 |         // guards against forgotten dependencies and such.
309 |         PnpWebpackPlugin,
310 |         // Prevents users from importing files from outside of src/ (or node_modules/).
311 |         // This often causes confusion because we only process files within src/ with babel.
312 |         // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
313 |         // please link the files into your node_modules/ and let module-resolution kick in.
314 |         // Make sure your source files are compiled, as they will not be processed in any way.
315 |         new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
316 |       ],
317 |     },
318 |     resolveLoader: {
319 |       plugins: [
320 |         // Also related to Plug'n'Play, but this time it tells Webpack to load its loaders
321 |         // from the current package.
322 |         PnpWebpackPlugin.moduleLoader(module),
323 |       ],
324 |     },
325 |     module: {
326 |       strictExportPresence: true,
327 |       rules: [
328 |         // Disable require.ensure as it's not a standard language feature.
329 |         { parser: { requireEnsure: false } },
330 | 
331 |         // First, run the linter.
332 |         // It's important to do this before Babel processes the JS.
333 |         {
334 |           test: /\.(js|mjs|jsx|ts|tsx)$/,
335 |           enforce: 'pre',
336 |           use: [
337 |             {
338 |               options: {
339 |                 cache: true,
340 |                 formatter: require.resolve('react-dev-utils/eslintFormatter'),
341 |                 eslintPath: require.resolve('eslint'),
342 |                 resolvePluginsRelativeTo: __dirname,
343 |                 
344 |               },
345 |               loader: require.resolve('eslint-loader'),
346 |             },
347 |           ],
348 |           include: paths.appSrc,
349 |         },
350 |         {
351 |           // "oneOf" will traverse all following loaders until one will
352 |           // match the requirements. When no loader matches it will fall
353 |           // back to the "file" loader at the end of the loader list.
354 |           oneOf: [
355 |             // "url" loader works like "file" loader except that it embeds assets
356 |             // smaller than specified limit in bytes as data URLs to avoid requests.
357 |             // A missing `test` is equivalent to a match.
358 |             {
359 |               test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
360 |               loader: require.resolve('url-loader'),
361 |               options: {
362 |                 limit: imageInlineSizeLimit,
363 |                 name: 'static/media/[name].[hash:8].[ext]',
364 |               },
365 |             },
366 |             // Process application JS with Babel.
367 |             // The preset includes JSX, Flow, TypeScript, and some ESnext features.
368 |             {
369 |               test: /\.(js|mjs|jsx|ts|tsx)$/,
370 |               include: paths.appSrc,
371 |               loader: require.resolve('babel-loader'),
372 |               options: {
373 |                 customize: require.resolve(
374 |                   'babel-preset-react-app/webpack-overrides'
375 |                 ),
376 |                 
377 |                 plugins: [
378 |                   [
379 |                     require.resolve('babel-plugin-named-asset-import'),
380 |                     {
381 |                       loaderMap: {
382 |                         svg: {
383 |                           ReactComponent:
384 |                             '@svgr/webpack?-svgo,+titleProp,+ref![path]',
385 |                         },
386 |                       },
387 |                     },
388 |                   ],
389 |                 ],
390 |                 // This is a feature of `babel-loader` for webpack (not Babel itself).
391 |                 // It enables caching results in ./node_modules/.cache/babel-loader/
392 |                 // directory for faster rebuilds.
393 |                 cacheDirectory: true,
394 |                 // See #6846 for context on why cacheCompression is disabled
395 |                 cacheCompression: false,
396 |                 compact: isEnvProduction,
397 |               },
398 |             },
399 |             // Process any JS outside of the app with Babel.
400 |             // Unlike the application JS, we only compile the standard ES features.
401 |             {
402 |               test: /\.(js|mjs)$/,
403 |               exclude: /@babel(?:\/|\\{1,2})runtime/,
404 |               loader: require.resolve('babel-loader'),
405 |               options: {
406 |                 babelrc: false,
407 |                 configFile: false,
408 |                 compact: false,
409 |                 presets: [
410 |                   [
411 |                     require.resolve('babel-preset-react-app/dependencies'),
412 |                     { helpers: true },
413 |                   ],
414 |                 ],
415 |                 cacheDirectory: true,
416 |                 // See #6846 for context on why cacheCompression is disabled
417 |                 cacheCompression: false,
418 |                 
419 |                 // Babel sourcemaps are needed for debugging into node_modules
420 |                 // code.  Without the options below, debuggers like VSCode
421 |                 // show incorrect code and set breakpoints on the wrong lines.
422 |                 sourceMaps: shouldUseSourceMap,
423 |                 inputSourceMap: shouldUseSourceMap,
424 |               },
425 |             },
426 |             // "postcss" loader applies autoprefixer to our CSS.
427 |             // "css" loader resolves paths in CSS and adds assets as dependencies.
428 |             // "style" loader turns CSS into JS modules that inject <style> tags.
429 |             // In production, we use MiniCSSExtractPlugin to extract that CSS
430 |             // to a file, but in development "style" loader enables hot editing
431 |             // of CSS.
432 |             // By default we support CSS Modules with the extension .module.css
433 |             {
434 |               test: cssRegex,
435 |               exclude: cssModuleRegex,
436 |               use: getStyleLoaders({
437 |                 importLoaders: 1,
438 |                 sourceMap: isEnvProduction && shouldUseSourceMap,
439 |               }),
440 |               // Don't consider CSS imports dead code even if the
441 |               // containing package claims to have no side effects.
442 |               // Remove this when webpack adds a warning or an error for this.
443 |               // See https://github.com/webpack/webpack/issues/6571
444 |               sideEffects: true,
445 |             },
446 |             // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
447 |             // using the extension .module.css
448 |             {
449 |               test: cssModuleRegex,
450 |               use: getStyleLoaders({
451 |                 importLoaders: 1,
452 |                 sourceMap: isEnvProduction && shouldUseSourceMap,
453 |                 modules: {
454 |                   getLocalIdent: getCSSModuleLocalIdent,
455 |                 },
456 |               }),
457 |             },
458 |             // Opt-in support for SASS (using .scss or .sass extensions).
459 |             // By default we support SASS Modules with the
460 |             // extensions .module.scss or .module.sass
461 |             {
462 |               test: sassRegex,
463 |               exclude: sassModuleRegex,
464 |               use: getStyleLoaders(
465 |                 {
466 |                   importLoaders: 2,
467 |                   sourceMap: isEnvProduction && shouldUseSourceMap,
468 |                 },
469 |                 'sass-loader'
470 |               ),
471 |               // Don't consider CSS imports dead code even if the
472 |               // containing package claims to have no side effects.
473 |               // Remove this when webpack adds a warning or an error for this.
474 |               // See https://github.com/webpack/webpack/issues/6571
475 |               sideEffects: true,
476 |             },
477 |             // Adds support for CSS Modules, but using SASS
478 |             // using the extension .module.scss or .module.sass
479 |             {
480 |               test: sassModuleRegex,
481 |               use: getStyleLoaders(
482 |                 {
483 |                   importLoaders: 2,
484 |                   sourceMap: isEnvProduction && shouldUseSourceMap,
485 |                   modules: {
486 |                     getLocalIdent: getCSSModuleLocalIdent,
487 |                   },
488 |                 },
489 |                 'sass-loader'
490 |               ),
491 |             },
492 |             // "file" loader makes sure those assets get served by WebpackDevServer.
493 |             // When you `import` an asset, you get its (virtual) filename.
494 |             // In production, they would get copied to the `build` folder.
495 |             // This loader doesn't use a "test" so it will catch all modules
496 |             // that fall through the other loaders.
497 |             {
498 |               loader: require.resolve('file-loader'),
499 |               // Exclude `js` files to keep "css" loader working as it injects
500 |               // its runtime that would otherwise be processed through "file" loader.
501 |               // Also exclude `html` and `json` extensions so they get processed
502 |               // by webpacks internal loaders.
503 |               exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
504 |               options: {
505 |                 name: 'static/media/[name].[hash:8].[ext]',
506 |               },
507 |             },
508 |             // ** STOP ** Are you adding a new loader?
509 |             // Make sure to add the new loader(s) before the "file" loader.
510 |           ],
511 |         },
512 |       ],
513 |     },
514 |     plugins: [
515 |       new WorkerPlugin(),
516 |       // Generates an `index.html` file with the <script> injected.
517 |       new HtmlWebpackPlugin(
518 |         Object.assign(
519 |           {},
520 |           {
521 |             inject: true,
522 |             template: paths.appHtml,
523 |           },
524 |           isEnvProduction
525 |             ? {
526 |                 minify: {
527 |                   removeComments: true,
528 |                   collapseWhitespace: true,
529 |                   removeRedundantAttributes: true,
530 |                   useShortDoctype: true,
531 |                   removeEmptyAttributes: true,
532 |                   removeStyleLinkTypeAttributes: true,
533 |                   keepClosingSlash: true,
534 |                   minifyJS: true,
535 |                   minifyCSS: true,
536 |                   minifyURLs: true,
537 |                 },
538 |               }
539 |             : undefined
540 |         )
541 |       ),
542 |       // Inlines the webpack runtime script. This script is too small to warrant
543 |       // a network request.
544 |       // https://github.com/facebook/create-react-app/issues/5358
545 |       isEnvProduction &&
546 |         shouldInlineRuntimeChunk &&
547 |         new InlineChunkHtmlPlugin(HtmlWebpackPlugin, [/runtime-.+[.]js/]),
548 |       // Makes some environment variables available in index.html.
549 |       // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
550 |       // <link rel="icon" href="%PUBLIC_URL%/favicon.ico">
551 |       // In production, it will be an empty string unless you specify "homepage"
552 |       // in `package.json`, in which case it will be the pathname of that URL.
553 |       // In development, this will be an empty string.
554 |       new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw),
555 |       // This gives some necessary context to module not found errors, such as
556 |       // the requesting resource.
557 |       new ModuleNotFoundPlugin(paths.appPath),
558 |       // Makes some environment variables available to the JS code, for example:
559 |       // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
560 |       // It is absolutely essential that NODE_ENV is set to production
561 |       // during a production build.
562 |       // Otherwise React will be compiled in the very slow development mode.
563 |       new webpack.DefinePlugin(env.stringified),
564 |       // This is necessary to emit hot updates (currently CSS only):
565 |       isEnvDevelopment && new webpack.HotModuleReplacementPlugin(),
566 |       // Watcher doesn't work well if you mistype casing in a path so we use
567 |       // a plugin that prints an error when you attempt to do this.
568 |       // See https://github.com/facebook/create-react-app/issues/240
569 |       isEnvDevelopment && new CaseSensitivePathsPlugin(),
570 |       // If you require a missing module and then `npm install` it, you still have
571 |       // to restart the development server for Webpack to discover it. This plugin
572 |       // makes the discovery automatic so you don't have to restart.
573 |       // See https://github.com/facebook/create-react-app/issues/186
574 |       isEnvDevelopment &&
575 |         new WatchMissingNodeModulesPlugin(paths.appNodeModules),
576 |       isEnvProduction &&
577 |         new MiniCssExtractPlugin({
578 |           // Options similar to the same options in webpackOptions.output
579 |           // both options are optional
580 |           filename: 'static/css/[name].[contenthash:8].css',
581 |           chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
582 |         }),
583 |       // Generate an asset manifest file with the following content:
584 |       // - "files" key: Mapping of all asset filenames to their corresponding
585 |       //   output file so that tools can pick it up without having to parse
586 |       //   `index.html`
587 |       // - "entrypoints" key: Array of files which are included in `index.html`,
588 |       //   can be used to reconstruct the HTML if necessary
589 |       new ManifestPlugin({
590 |         fileName: 'asset-manifest.json',
591 |         publicPath: publicPath,
592 |         generate: (seed, files, entrypoints) => {
593 |           const manifestFiles = files.reduce((manifest, file) => {
594 |             manifest[file.name] = file.path;
595 |             return manifest;
596 |           }, seed);
597 |           const entrypointFiles = entrypoints.main.filter(
598 |             fileName => !fileName.endsWith('.map')
599 |           );
600 | 
601 |           return {
602 |             files: manifestFiles,
603 |             entrypoints: entrypointFiles,
604 |           };
605 |         },
606 |       }),
607 |       // Moment.js is an extremely popular library that bundles large locale files
608 |       // by default due to how Webpack interprets its code. This is a practical
609 |       // solution that requires the user to opt into importing specific locales.
610 |       // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
611 |       // You can remove this if you don't use Moment.js:
612 |       new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
613 |       // Generate a service worker script that will precache, and keep up to date,
614 |       // the HTML & assets that are part of the Webpack build.
615 |       isEnvProduction &&
616 |         new WorkboxWebpackPlugin.GenerateSW({
617 |           clientsClaim: true,
618 |           exclude: [/\.map$/, /asset-manifest\.json$/],
619 |           importWorkboxFrom: 'cdn',
620 |           navigateFallback: publicUrl + '/index.html',
621 |           navigateFallbackBlacklist: [
622 |             // Exclude URLs starting with /_, as they're likely an API call
623 |             new RegExp('^/_'),
624 |             // Exclude any URLs whose last part seems to be a file extension
625 |             // as they're likely a resource and not a SPA route.
626 |             // URLs containing a "?" character won't be blacklisted as they're likely
627 |             // a route with query params (e.g. auth callbacks).
628 |             new RegExp('/[^/?]+\\.[^/]+$'),
629 |           ],
630 |         }),
631 |       // TypeScript type checking
632 |       useTypeScript &&
633 |         new ForkTsCheckerWebpackPlugin({
634 |           typescript: resolve.sync('typescript', {
635 |             basedir: paths.appNodeModules,
636 |           }),
637 |           async: isEnvDevelopment,
638 |           useTypescriptIncrementalApi: true,
639 |           checkSyntacticErrors: true,
640 |           resolveModuleNameModule: process.versions.pnp
641 |             ? `${__dirname}/pnpTs.js`
642 |             : undefined,
643 |           resolveTypeReferenceDirectiveModule: process.versions.pnp
644 |             ? `${__dirname}/pnpTs.js`
645 |             : undefined,
646 |           tsconfig: paths.appTsConfig,
647 |           reportFiles: [
648 |             '**',
649 |             '!**/__tests__/**',
650 |             '!**/?(*.)(spec|test).*',
651 |             '!**/src/setupProxy.*',
652 |             '!**/src/setupTests.*',
653 |           ],
654 |           silent: true,
655 |           // The formatter is invoked directly in WebpackDevServerUtils during development
656 |           formatter: isEnvProduction ? typescriptFormatter : undefined,
657 |         }),
658 |     ].filter(Boolean),
659 |     // Some libraries import Node modules but don't use them in the browser.
660 |     // Tell Webpack to provide empty mocks for them so importing them works.
661 |     node: {
662 |       module: 'empty',
663 |       dgram: 'empty',
664 |       dns: 'mock',
665 |       fs: 'empty',
666 |       http2: 'empty',
667 |       net: 'empty',
668 |       tls: 'empty',
669 |       child_process: 'empty',
670 |     },
671 |     // Turn off performance processing because we utilize
672 |     // our own hints via the FileSizeReporter
673 |     performance: false,
674 |   };
675 | };
676 | 


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