webpack4打包vendor chunk

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entry: {
    client: ['./client.js'],
    vendor: ['babel-polyfill', 'react', 'react-dom', 'redux']
},
output: {
    filename: '[name].[chunkhash].bundle.js',
    path: '../dist',
    chunkFilename: '[name].[chunkhash].bundle.js',
    publicPath: '/'
},
plugins: [
    new webpack.HashedModuleIdPlugin(),
    new webpack.optimize.CommonsChunkPlugin({
        name: 'vendor'
    }),
    new webpack.optimize.CommonsChunkPlugin({
        name: 'runtime'
    })
]

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entry: {
 vendor: ['react', 'react-dom', 'react-router'],
 app: paths.appIndexJs
},
optimization: {
 splitChunks: {
  cacheGroups: {
    // match the entry point and spit out the file named here
    vendor: {
      chunks: 'initial',
      name: 'vendor',
      test: 'vendor',
      filename: 'vendor.js',
      enforce: true,
    },
  },
 },
},