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

// dll文件存放的目录
const dllPath = 'public/vendor';

module.exports = {
  entry: {
    // 需要提取的库文件
    vendor: [
      'vue',
      'vue-router',
      'vuex',
      'axios',
      'element-ui',
      'echarts',
      '@antv/g2plot',
      '@antv/l7-maps',
      '@antv/s2',
      'lodash',
    ],
  },
  output: {
    path: path.join(__dirname, dllPath),
    filename: '[name].dll.js',
    // vendor.dll.js中暴露出的全局变量名
    // 保持与 webpack.DllPlugin 中名称一致
    library: '[name]_[hash]',
  },
  plugins: [
    // 清除之前的dll文件
    new CleanWebpackPlugin(['*.*'], {
      root: path.join(__dirname, dllPath),
    }),
    // manifest.json 描述动态链接库包含了哪些内容
    new webpack.DllPlugin({
      path: path.join(__dirname, dllPath, '[name]-manifest.json'),
      // 保持与 output.library 中名称一致
      name: '[name]_[hash]',
      context: process.cwd(),
    }),
  ],
};