old_contents: import webpack from 'webpack';
  import yargs from 'yargs';
  
  const { optimizeMinimize } = yargs.alias('p', 'optimize-minimize').argv;
  const nodeEnv = optimizeMinimize ? 'production' : 'development';
  
  export default {
    entry: {
      ReactRouterBootstrap: './src/index.js',
    },
  
    output: {
      path: './lib',
      filename: optimizeMinimize ? '[name].min.js' : '[name].js',
      library: 'ReactRouterBootstrap',
      libraryTarget: 'umd',
    },
  
    module: {
      loaders: [
        { test: /\.js$/, loader: 'babel', exclude: /node_modules/ },
      ],
    },
  
    externals: [
      {
        react: {
          root: 'React',
          commonjs2: 'react',
          commonjs: 'react',
          amd: 'react',
        },
      },
      {
        'react-router': {
          root: 'ReactRouter',
          commonjs2: 'react-router',
          commonjs: 'react-router',
          amd: 'react-router',
        },
      },
    ],
  
    plugins: [
      new webpack.DefinePlugin({
        'process.env': { NODE_ENV: JSON.stringify(nodeEnv) },
      }),
    ],
  
    devtool: optimizeMinimize ? 'source-map' : null,
  };
  
new_contents: import webpack from 'webpack';
  import yargs from 'yargs';
  
  const { optimizeMinimize } = yargs.alias('p', 'optimize-minimize').argv;
  const nodeEnv = optimizeMinimize ? 'production' : 'development';
  
  export default {
    entry: {
      ReactRouterBootstrap: './src/index.js',
    },
  
    output: {
      path: './lib',
      filename: optimizeMinimize ? '[name].min.js' : '[name].js',
      library: 'ReactRouterBootstrap',
      libraryTarget: 'umd',
    },
  
    module: {
      loaders: [
        { test: /\.js$/, loader: 'babel', exclude: /node_modules/ },
      ],
    },
  
    externals: [
      {
        react: {
          root: 'React',
          commonjs2: 'react',
          commonjs: 'react',
          amd: 'react',
        },
      },
      {
        'react-router-dom': {
          root: 'ReactRouterDOM',
          commonjs2: 'react-router-dom',
          commonjs: 'react-router-dom',
          amd: 'react-router-dom',
        },
      },
    ],
  
    plugins: [
      new webpack.DefinePlugin({
        'process.env': { NODE_ENV: JSON.stringify(nodeEnv) },
      }),
    ],
  
    devtool: optimizeMinimize ? 'source-map' : null,
  };
  
subject: Fix webpack config