webpack.prod.js

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = [{
  // entry: ['babel-polyfill', './index.js'],
  entry: './index.js',
  output: {
    path: path.join(__dirname, '/lib'),
    filename: 'index.js',
    library: 'WebChat',
    libraryTarget: 'umd'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.scss$/,
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader' },
          {
            loader: 'sass-loader',
            options: {
              includePaths: [path.resolve(__dirname, 'src/scss/')]
            }
          }
        ]
      },
      {
        test: /\.(jpg|png|gif|svg)$/,
        use: {
          loader: 'url-loader'
        }
      }
    ]
  },
  plugins: [new CleanWebpackPlugin(['lib'])]
}, {
  entry: './index.js',
  externals: {
    react: {
      root: 'React',
      commonjs2: 'react',
      commonjs: 'react',
      amd: 'react',
      umd: 'react'
    },
    'react-dom': {
      root: 'ReactDOM',
      commonjs2: 'react-dom',
      commonjs: 'react-dom',
      amd: 'react-dom',
      umd: 'react-dom'
    }
  },
  output: {
    path: path.join(__dirname, '/module'),
    filename: 'index.js',
    library: 'WebChat',
    libraryTarget: 'umd'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.scss$/,
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader' },
          {
            loader: 'sass-loader',
            options: {
              includePaths: [path.resolve(__dirname, 'src/scss/')]
            }
          }
        ]
      },
      {
        test: /\.(jpg|png|gif|svg)$/,
        use: {
          loader: 'url-loader'
        }
      }
    ]
  },
  plugins: [new CleanWebpackPlugin(['module'])]
}
];