@anansi/webpack-config

Production ready webpack for React

A webpack 5 configuration for fast development and production ready optimizations.

(For webpack 4 compatible config, use @anansi/webpack-config@5.4.1)

Installation

yarn add --dev webpack webpack-cli webpack-dev-server react-refresh @anansi/webpack-config

or

npm install --save-dev webpack webpack-cli webpack-dev-server react-refresh @anansi/webpack-config

If using sass, be sure to install it as well

yarn add --dev sass

Configuration

/webpack.config.js

const { makeConfig } = require('@anansi/webpack-config');

// See #options below
const options = {
  basePath: 'src',
  buildDir: 'generated_assets/',
};

module.exports = { options };

module.exports = makeConfig(options);

Advanced configuration /webpack.config.js

const { makeConfig } = require('@anansi/webpack-config');

// See #options below
const options = {
  basePath: 'src',
  buildDir: 'generated_assets/',
};

module.exports = { options };

const baseConfig = makeConfig(options);

module.exports = (env, argv) => {
  const config = baseConfig(env, argv);

  // Config is fully available for modification
  // Adding any custom plugins is simple
  config.plugins.push(
    new CspHtmlWebpackPlugin()
  );

  return config;
}

See Options for more options to configure

/package.json

{
  "scripts": {
    "start": "webpack serve --mode=development",
    "build": "webpack --mode=production",
    "build:server": "webpack --mode=production --target=node",
    "build:analyze": "webpack --mode=production --env analyze",
    "build:profile": "webpack --mode=production --env profile",
    "test:pkg": "webpack --env check=nobuild"
  }
}

(--env requires webpack-cli >= v4)

See cmd-line-arguments for more detail.

See ENV to use environmental variables to customize builds

TypeScript (optional)

/tsconfig.js

{
  "compilerOptions": {
    "types": ["@anansi/webpack-config/types"],
  }
}

Storybook 8 (optional)

npm install --dev storybook @storybook/react @anansi/storybook

Set @anansi/storybook as the framework

/.storybook/main.js

module.exports = {
  framework: {
    name: '@anansi/storybook'
  },
};

Jest (optional)

yarn add --dev jest @anansi/jest-preset

/jest.config.js

module.exports = {
  preset: "@anansi/jest-preset"
}

Enabling react-refresh

Install react-refresh as a dev-dependency in your project and it will automatically be detected and enabled. Be sure to use the anansi babel or include react-refresh/babel in your own babel configuration.

yarn add --dev react-refresh

File Support

Production builds optimize all files for size, delivery and runtime performance

Development optimized for quick iteration and debuggability

• JavaScript
  • JSX
  • TypeScript
  • Web Workers
  • Web Assembly (WASM)
• Styling (CSS)
  • SCSS with CSS modules
    • By default both .css and .scss files work as CSS Modules

      .button {
        border-radius: 6px;
        color: black;
        background: gray;
      }
      

      import * as styles from './myfile.scss';
      
      export default function MyComponent() {
        return <div className={styles.button}>Hello world</div>;
      }
      

    • Export SCSS variables into javascript via icss

      :export {
        bodyColor: $body-color;
        backgroundColor: $background-color;
      }
      

    • Provide variables/mixins to every sass file by adding sassResource

      const { makeConfig } = require('@anansi/webpack-config');
      
      const options = {
        basePath: 'src',
        buildDir: 'dist/',
        sassResources: [`${__dirname}/src/style/export.scss`],
      };
      
      module.exports = makeConfig(options);
      
      module.exports.options = options;
      
      

    • Apply global styles to every file in globalStyleDir

      const { makeConfig } = require('@anansi/webpack-config');
      
      const options = {
        basePath: 'src',
        buildDir: 'dist/',
        globalStyleDir: 'style',
      };
      
      module.exports = makeConfig(options);
      
      module.exports.options = options;
      
      

  • CSS in JS via Linaria
• Media
  • All font formats
  • Any media files

    • svg|png|apng|jpg|avif|gif|ico|webp|cur|ani|otf|eot|woff2|woff|ttf|pdf|mp4|webm|wav|mp3|m4a|aac|oga as file urls anywhere

    • SVG as file urls or components

      import starUrl, { ReactComponent as Star } from './star.svg'
      
      const App = () => (
        <div>
          <img src={starUrl} alt="star" />
          <Star />
        </div>
      )
      

• Raw string data
  • .md, .txt
• JSON as POJO
• HTML via html-loader

CMD line arguments

analyze

If set, will build a static treemap visualization of your packages. Highly recommended to run in production mode to get accurate results.

webpack --mode=production --env analyze

check

If set will run package checks to check for duplicates or ciruclar dependencies. Set equal to 'nobuild' for a standalone run where build output is not needed.

Examples: webpack --mode=production --env check or webpack --env check=nobuild

profile

If set, will enable React DevTools Profiler. This feature is only available in production mode since it is enabled in development by default.

webpack --mode=production --env profile

readable

Skips minification. This is useful when trying to debug production code.

webpack --mode=production --env readable

target

To target node instead of default of web. This is useful when building a node server for SSR alongside the client bundle.

webpack --mode=production --target=node

nohash

This is useful for diffing bundle filesizes as it removes cache busting filenames - keeping the name the same as their contents change.

For example compressed-size-action can track bundle size changes.

webpack --mode=production --env nohash

ENV customization

Environmental variable control is sometimes useful in CI pipelines to distinguish between various deploy targets.

WEBPACK_PUBLIC_HOST = ''

Sets domain of served files. This is useful to distinguish between different build environments that will serve assets from different locations like a CDN.

Serves as first half of publicPath

Note: dev mode sets its own path based assets serving is completely controlled by webpack-dev-server.

WEBPACK_PUBLIC_PATH = '/'

Forms the second half of the publicPath. Can be useful when assets are served in subdirectories as opposed to custom domains like in the case of CDNs.

HTTPS, SSL_CRT_FILE, SSL_KEY_FILE

Applies to webpack-dev-server only

HTTPS=true enables self-signed cert

SSL_CRT_FILE and SSL_KEY_FILE enable using certificates stored in files

NO_HOT_RELOAD

Setting to 'true' will disable all hot reloading functionality (only enabled by default in dev mode).

WEBPACK_CACHE: 'none' | 'memory' | 'filesystem'

Sets webpack cache type.

Options

Pass these to makeConfig.

library

Use this option to compile for libraries rather than web applications.

Options are from https://webpack.js.org/configuration/output/#outputlibrary

const myConfig = makeConfig({
  library: {
    type: 'commonjs2',
  },
});

libraryInclude/libraryExclude

Regex to match libraries to include in the normal build process. This is useful for locally developed modules or yarn workspaces. Not this should point to the installed location, rather than the actual target. Note you'll need both the positive and negative regexes.

libraryExclude defaults to /node_modules/, which will exclude libraries from expensive and potentially incorrect processing from babel loaders.

With a monorepo layout like so

/
  /packages
    /package-a
    /package-b
  /myapp
    webpack.config.js

Where package-a and package-b are namespaced under @myspacespace:

const myConfig = makeConfig({
  libraryInclude: path.resolve(__dirname, '../packages'),
  libraryExclude: /node_modules(?!\/(@mynamespace\/))/,
});

basePath = 'src'

Marks the base directory inside the package for javascript source files. This is used to make it easy to import from the root.

Example:

-package.json
-/src
  -/components
  -/pages
  -/utils
    -network.js

Then you can do

import fetch from 'network';

from any file.

babelRoot = $CWD

babelRoot should be where the root babel configuration file is in your repo. Usually this is CWD, but while setting up a monorepo with multiple babel configurations, you may need to change this value.

rootPath = $CWD

Root path should be the root path of your project. Usually where your package.json and webpack.config.js are. This defaults to the current working directory you are running commands from. However, if you need to run things from another directory, you can send __dirname into this option from your webpack.config.js.

buildDir = 'generated_assets/'

Output directory for production build files

serverDir: 'server_assets/'

Output directory for production server builds. Used when using --target=node cli option.

mode: argv?.mode || process.env.NODE_ENV

Override the mode

htmlOptions

If specified, uses html-webpack-plugin to build a static html file including all assets. Using this makes development easy, and allows for cheap static deploys to CDNs like S3+cloudfront.

Configuration options

svgoOptions

SVG files are optimized automatically in production builds to minimize size. SVGO is used for this. Set this to specify specific options. Alternatively set to false to disable SVGO altogether. (Note: SVGO will never run in dev mode)

Configuration options

svgrOptions

SVGR enables importing SVG as a file or a component. This option allows further customizing how that is achieved.

Configuration options

inJSOptions

Can configure how wyw-in-js operates, and thus control things like linaria. Set to false to disable wyw-in-js altogether. Note that wyw-in-js has its own config files it can use, and it is recommended to use those instead.

Configuring Linaria

cssExtractOptions

Can configure how MiniCssExtractPlugin operates. Set to false to disable CSS extraction altogether.

Configuration options

tsconfigPathOptions

Enabled by default. Uses any module resolution specifications like aliases in tsconfig.

Set to false to disable; or set to object to configure the options.

Configuring tsconfig path options

fontPreload = 'preload' | 'prefetch'

If specified, will preload web fonts. Choice determines the rel attribute of the link tag.

This usually provides benefits when serving assets over HTTP/2. If using HTTP1.1 this is typically detrimental.

bundleAnalyzerOptions

Customize how to analyze your bundles

manifestFilename = 'manifest.json'

Determines the filename for the stats file that includes mappings to all filenames.

babelLoader

Override any babel loader specific options.

extraJsLoaders = []

Any extra loaders to use on JavaScript/TypeScript files.

cssModuleOptions

Customize css module options.

globalStyleDir = 'style'

Directory where only global styles are defined (no css modules)

Set to false to disable

terserOptions

Used to customize terser in prod builds.

sassOptions

false disables sass altogether.

Otherwise, these configure the sass-loader

For instance, using sass-embedded can be done like so:

/webpack.config.js

const { makeConfig } = require('@anansi/webpack-config');

// See #options below
const options = {
  sassOptions: {
    implementation: require("sass-embedded"),
  }
};

module.exports = { options };

module.exports = makeConfig(options);

sassResources

resources option from https://github.com/shakacode/sass-resources-loader#readme

This is useful to specify global variables and mixins to be included in every sass file.

Working with TypeScript

Add @anansi/webpack-config/types to the types in tsconfig.json

{
  "compilerOptions": {
    "types": ["@anansi/webpack-config/types"],
  }
}

This makes all imports of supported formats typed correctly, including svgs, media files and workers.

e.g.,

import * as plain from './plain.css';
import angleDownUrl, {
  ReactComponent as AngleDown,
} from './angle-down-solid.svg';

const worker = new Worker(new URL('./echo.js', import.meta.url));

worker.postMessage({ message: 'rendered' });

export default function MyComponent() {
  return (
    <>
      <AngleDown className={plain.svg} />
      <img src={angleDownUrl} />
    </>
  );
}

Note: Importing workers using URL is now recommended. However, it means the file cannot be named .worker.(js|ts) This is to keep backwards compatibility with workers imported via worker-loader

Working with Linaria

When testing modules that use Linaria, it's important to add the wyw-in-js babel preset to the babel config. This is because webpack is not run, and thus will not properly process the embeds.

• Install linaria: yarn add --dev @linaria/core @linaria/react @wyw-in-js/babel-preset
• Add @wyw-in-js to babel presets.

module.exports = {
  presets: [
    '@anansi',
    '@wyw-in-js',
  ],
};