webpack.config.js

const path = require("path");

const isProduction = process.env.NODE_ENV === "production";

const stylesHandler = "style-loader";

const NODE_ENV = process.env.NODE_ENV || "development";
const outFilename = `index.${NODE_ENV}.js`;

console.log(`Building ${NODE_ENV}...`);

const config = {
  entry: "./src/index.js",
  output: {
    library: "ReactCashmere",
    libraryTarget: "umd",
    filename: outFilename,
    path: path.resolve(__dirname, "dist"),
  },
  plugins: [],
  externals: [
    /^@mui\/*/, // Don't bundle any mui libraries
    {
      // Don't bundle react or react-dom
      react: {
        commonjs: "react",
        commonjs2: "react",
        amd: "React",
        root: "React",
      },
      "react-dom": {
        commonjs: "react-dom",
        commonjs2: "react-dom",
        amd: "ReactDOM",
        root: "ReactDOM",
      }
    },
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        use: ["babel-loader"],
        exclude: ["/node_modules/", "/public/", "/src/stories"],
      },
      {
        test: /\.css$/i,
        use: [stylesHandler, "css-loader"],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          stylesHandler,
          {
            loader: "css-loader",
            options: {
              importLoaders: 1,
              modules: {
                localIdentName: '[name]',
                mode: "global",
              },
            },
          },
          {
            loader: "sass-loader",
            options: {
              implementation: require("sass"),
            },
          },
        ],
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2|png|jpg|gif)$/i,
        type: "asset",
        generator: {
          filename: "./fonts/[name][ext]",
        },
      },
    ],
  },
  resolve: {
    extensions: [".tsx", ".ts", ".jsx", ".js", "..."],
  },
};

module.exports = () => {
  if (isProduction) {
    config.mode = "production";
  } else {
    config.mode = "development";
    config.devtool = "source-map";
  }
  return config;
};