webpack.config.js

const path = require('path');
const webpack = require('webpack');
const TerserPlugin = require('terser-webpack-plugin');
const ReactNative = require('@callstack/repack');

/**
 * More documentation, installation, usage, motivation and differences with Metro is available at:
 * https://github.com/callstack/repack/blob/main/README.md
 *
 * The API documentation for the functions and plugins used in this file is available at:
 * https://re-pack.netlify.app/
 */

/**
 * This is the Webpack configuration file for your React Native project.
 * It can be used in 2 ways:
 * - by running React Native CLI eg: `npx react-native start` or `npx react-native bundle`
 * - by running Webpack CLI eg: `PLATFORM=(ios|android) npx webpack-cli -c webpack.config.js`
 *
 * Depending on which option you chose the output might be different, since when running with
 * React Native CLI most of the values from `getMode`, `getPlatform`, etc. will be filled in by React Native CLI.
 * However, when running with Webpack CLI, you might want to tweak `fallback` values to your liking.
 *
 * Please refer to the API documentation for list of options, plugins and their descriptions.
 */

/**
 * Get options from React Native CLI when Webpack is run from `react-native start` or `react-native bundle`.
 *
 * If you run Webpack using Webpack CLI, the values from `fallback` will be used - use it
 * to specify your values, if the defaults don't suit your project.
 */

const mode = ReactNative.getMode({fallback: 'development'});
const dev = mode === 'development';
const context = ReactNative.getContext();
const entry = ReactNative.getEntry();
const platform = ReactNative.getPlatform({fallback: process.env.PLATFORM});
const minimize = ReactNative.isMinimizeEnabled({fallback: !dev});
const devServer = ReactNative.getDevServerOptions();
const reactNativePath = ReactNative.getReactNativePath();

/**
 * Depending on your Babel configuration you might want to keep it.
 * If you don't use `env` in your Babel config, you can remove it.
 *
 * Keep in mind that if you remove it you should set `BABEL_ENV` or `NODE_ENV`
 * to `development` or `production`. Otherwise your production code might be compiled with
 * in development mode by Babel.
 */
process.env.BABEL_ENV = mode;

/**
 * Webpack configuration.
 */
module.exports = {
  mode,
  /**
   * This should be always `false`, since the Source Map configuration is done
   * by `SourceMapDevToolPlugin`.
   */
  devtool: false,
  context,
  /**
   * `getInitializationEntries` will return necessary entries with setup and initialization code.
   * If you don't want to use Hot Module Replacement, set `hmr` option to `false`. By default,
   * HMR will be enabled in development mode.
   */
  entry: [
    ...ReactNative.getInitializationEntries(reactNativePath, {
      hmr: devServer.hmr,
    }),
    entry,
  ],
  resolve: {
    /**
     * `getResolveOptions` returns additional resolution configuration for React Native.
     * If it's removed, you won't be able to use `<file>.<platform>.<ext>` (eg: `file.ios.js`)
     * convention and some 3rd-party libraries that specify `react-native` field
     * in their `package.json` might not work correctly.
     */
    ...ReactNative.getResolveOptions(platform),

    /**
     * Uncomment this to ensure all `react-native*` imports will resolve to the same React Native
     * dependency. You might need it when using workspaces/monorepos or unconventional project
     * structure. For simple/typical project you won't need it.
     */
    // alias: {
    //   'react-native': reactNativePath,
    // },
  },
  /**
   * Configures output.
   * It's recommended to leave it as it is unless you know what you're doing.
   * By default Webpack will emit files into the directory specified under `path`. In order for the
   * React Native app use them when bundling the `.ipa`/`.apk`, they need to be copied over with
   * `ReactNative.OutputPlugin`, which is configured by default.
   */
  output: {
    clean: true,
    path: path.join(__dirname, 'build', platform),
    filename: 'index.bundle',
    chunkFilename: '[name].chunk.bundle',
    publicPath: ReactNative.getPublicPath(devServer),
  },
  /**
   * Configures optimization of the built bundle.
   */
  optimization: {
    /** Enables minification based on values passed from React Native CLI or from fallback. */
    minimize,
    /** Configure minimizer to process the bundle. */
    minimizer: [
      new TerserPlugin({
        test: /\.(js)?bundle(\?.*)?$/i,
        /**
         * Prevents emitting text file with comments, licenses etc.
         * If you want to gather in-file licenses, feel free to remove this line or configure it
         * differently.
         */
        extractComments: false,
      }),
    ],
  },
  module: {
    /**
     * This rule will process all React Native related dependencies with Babel.
     * If you have a 3rd-party dependency that you need to transpile, you can add it to the
     * `include` list.
     *
     * You can also enable persistent caching with `cacheDirectory` - please refer to:
     * https://github.com/babel/babel-loader#options
     */
    rules: [
      {
        test: /\.[jt]sx?$/,
        include: [
          /node_modules(.*[/\\])+react/,
          /node_modules(.*[/\\])+@react-native/,
          /node_modules(.*[/\\])+@react-navigation/,
          /node_modules(.*[/\\])+@react-native-community/,
          /node_modules(.*[/\\])+@expo/,
          /node_modules(.*[/\\])+pretty-format/,
          /node_modules(.*[/\\])+metro/,
          /node_modules(.*[/\\])+abort-controller/,
          /node_modules(.*[/\\])+@callstack[/\\]repack/,
        ],
        use: 'babel-loader',
      },
      /**
       * Here you can adjust loader that will process your files.
       *
       * You can also enable persistent caching with `cacheDirectory` - please refer to:
       * https://github.com/babel/babel-loader#options
       */
      {
        test: /\.[jt]sx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            /** Add React Refresh transform only when HMR is enabled. */
            plugins: devServer.hmr ? ['module:react-refresh/babel'] : undefined,
          },
        },
      },
      /**
       * This loader handles all static assets (images, video, audio and others), so that you can
       * use (reference) them inside your application.
       *
       * If you wan to handle specific asset type manually, filter out the extension
       * from `ASSET_EXTENSIONS`, for example:
       * ```
       * ReactNative.ASSET_EXTENSIONS.filter((ext) => ext !== 'svg')
       * ```
       */
      {
        test: ReactNative.getAssetExtensionsRegExp(
          ReactNative.ASSET_EXTENSIONS,
        ),
        use: {
          loader: '@callstack/repack/assets-loader',
          options: {
            platform,
            devServerEnabled: devServer.enabled,
            /**
             * Defines which assets are scalable - which assets can have
             * scale suffixes: `@1x`, `@2x` and so on.
             * By default all images are scalable.
             */
            scalableAssetExtensions: ReactNative.SCALABLE_ASSETS,
          },
        },
      },
    ],
  },
  plugins: [
    /**
     * Various libraries like React and React rely on `process.env.NODE_ENV` / `__DEV__`
     * to distinguish between production and development
     */
    new webpack.DefinePlugin({
      __DEV__: JSON.stringify(dev),
    }),

    /**
     * This plugin makes sure the resolution for assets like images works with scales,
     * for example: `image@1x.png`, `image@2x.png`.
     */
    new ReactNative.AssetsResolverPlugin({
      platform,
    }),

    /**
     * React Native environment (globals and APIs that are available inside JS) differ greatly
     * from Web or Node.js. This plugin ensures everything is setup correctly so that features
     * like Hot Module Replacement will work correctly.
     */
    new ReactNative.TargetPlugin(),

    /**
     * By default Webpack will emit files into `output.path` directory (eg: `<root>/build/ios`),
     * but in order to for the React Native application to include those files (or a subset of those)
     * they need to be copied over to correct output directories supplied from React Native CLI
     * when bundling the code (with `webpack-bundle` command).
     * In development mode (when development server is running), this plugin is a no-op.
     */
    new ReactNative.OutputPlugin({
      platform,
      devServerEnabled: devServer.enabled,
    }),

    /**
     * Runs development server when running with React Native CLI start command or if `devServer`
     * was provided as s `fallback`.
     */
    new ReactNative.DevServerPlugin({
      platform,
      ...devServer,
    }),

    /**
     * Configures Source Maps for the main bundle based on CLI options received from
     * React Native CLI or fallback value..
     * It's recommended to leave the default values, unless you know what you're doing.
     * Wrong options might cause symbolication of stack trace inside React Native app
     * to fail - the app will still work, but you might not get Source Map support.
     */
    new webpack.SourceMapDevToolPlugin({
      test: /\.(js)?bundle$/,
      exclude: /\.chunk\.(js)?bundle$/,
      filename: '[file].map',
      append: `//# sourceMappingURL=[url]?platform=${platform}`,
      /**
       * Uncomment for faster builds but less accurate Source Maps
       */
      // columns: false,
    }),

    /**
     * Configures Source Maps for any additional chunks.
     * It's recommended to leave the default values, unless you know what you're doing.
     * Wrong options might cause symbolication of stack trace inside React Native app
     * to fail - the app will still work, but you might not get Source Map support.
     */
    new webpack.SourceMapDevToolPlugin({
      test: /\.(js)?bundle$/,
      include: /\.chunk\.(js)?bundle$/,
      filename: '[file].map',
      append: `//# sourceMappingURL=[url]?platform=${platform}`,
      /**
       * Uncomment for faster builds but less accurate Source Maps
       */
      // columns: false,
    }),

    /**
     * Logs messages and progress.
     * It's recommended to always have this plugin, otherwise it might be difficult
     * to figure out what's going on when bundling or running development server.
     */
    new ReactNative.LoggerPlugin({
      platform,
      devServerEnabled: devServer.enabled,
      output: {
        console: true,
        /**
         * Uncomment for having logs stored in a file to this specific compilation.
         * Compilation for each platform gets it's own log file.
         */
        // file: path.join(__dirname, `${mode}.${platform}.log`),
      },
    }),
  ],
};