webpack.config.prod.js

const path = require('path');

const webpack = require('webpack');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const autoprefixer = require('autoprefixer');

module.exports = {
  externals: [
    {
      'react-dom': {
        root: 'ReactDOM',
        commonjs2: 'react-dom',
        commonjs: 'react-dom',
        amd: 'react-dom',
      },
    },
    {
      react: {
        root: 'React',
        commonjs2: 'react',
        commonjs: 'react',
        amd: 'react',
      },
    },
    {
      'prop-types': {
        root: 'PropTypes',
        commonjs2: 'prop-types',
        commonjs: 'prop-types',
        amd: 'prop-types',
      },
    },
  ],
  resolve: {
    extensions: ['.js', '.jsx', '.json'],
    modules: [
      'node_modules',
      path.join(__dirname, 'src'),
    ],
  },
  devtool: 'source-map',
  entry: './src/index.js',
  output: {
    filename: 'react-file-input.js',
    library: 'react-file-input',
    libraryTarget: 'umd',
    path: path.resolve(__dirname, 'dist'),
    umdNamedDefine: true,
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: false,
    }),
    new ExtractTextPlugin({
      filename: 'react-file-input.css',
      disable: false,
      allChunks: true,
    }),
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: ['babel-loader'],
      },
      {
        test: /(\.css|\.scss)$/,
        use: ExtractTextPlugin.extract({
          use: [
            {
              loader: 'css-loader',
              options: {
                sourceMap: false,
                minimize: true,
              },
            },
            {
              loader: 'postcss-loader',
              options: {
                sourceMap: true,
                plugins: () => [autoprefixer],
              },
            },
            {
              loader: 'sass-loader',
              options: {
                sourceMap: false,
              },
            },
          ],
        }),
      },
    ],
  },
};