webpack.config.js

const webpack = require('webpack');
const path = require('path');
const HtmlWebPackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const fs = require('fs');

const appDirectory = fs.realpathSync(process.cwd());

// Gets absolute path of file within app directory
const resolveAppPath = (relativePath) => path.resolve(appDirectory, relativePath);

// Host
const host = process.env.HOST || 'localhost';

const env = process.env.NODE_ENV || 'development';

module.exports = {
  mode: env === 'production' ? 'production' : 'development',
  context: __dirname,
  entry: {
    lib: path.join(__dirname, 'src', 'index.ts'),
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].bundle.js',
    library: 'ui',
    libraryTarget: 'umd',
    umdNamedDefine: true,
  },
  devtool: 'source-map',
  devServer: {
    host: '0.0.0.0',
    port: 9000,
  },
  resolve: {
    extensions: [
      '.js',
      '.jsx',
      '.json',
      '.ts',
      '.tsx',
      'less',
      'scss',
      'svg',
      'woff',
      'ttf',
      'eot',
    ],
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx|js|jsx)$/,
        exclude: /(node_modules)/,
        use: [{ loader: 'babel-loader' }],
      },
      { enforce: 'pre', test: /\.js$/, loader: 'source-map-loader' },
      {
        // Preprocess our own .css files
        // This is the place to add your own loaders (e.g. sass/less etc.)
        // for a list of loaders, see https://webpack.js.org/loaders/#styling
        test: /\.css$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader', 'less-loader', 'sass-loader'],
      },
      {
        test: /\.less$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader', // translates CSS into CommonJS
          },
          {
            loader: 'less-loader', // compiles Less to CSS
          },
        ],
      },
      {
        test: /\.(sass|scss)$/,
        use: [
          'style-loader',
          'css-loader',
          {
            loader: 'sass-loader',
            options: {
              sassOptions: {
                includePaths: [path.resolve(__dirname, 'node_modules')],
              },
            },
          },
        ],
      },
      {
        // Preprocess 3rd party .css files located in node_modules
        test: /\.css$/,
        include: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  externals: {
    'styled-components': {
      commonjs: 'styled-components',
      commonjs2: 'styled-components',
      amd: 'styled-components',
    },
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'react',
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'react-dom',
    },
  },
  plugins: [
    new CopyWebpackPlugin({ patterns: [{ from: 'src/theme/kit.css', to: '' }] }),
    new webpack.optimize.LimitChunkCountPlugin({
      maxChunks: 1,
    }),
],
  optimization: {
    minimize: false,
  },
};