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/js'

module.exports = {
  entry: {
    // 需要提取的库文件
    vendor: [
      'vue/dist/vue.esm.js',
      'vue', 'vue-router', 
      'vuex', 'axios','echarts',
      'vue-amap','halosee-ui',
      'vue-ueditor-wrap',
      'moment','video.js',
      'jquery','babel-polyfill',
      'handsontable',
      'xlsx/dist/xlsx.core.min.js',
      'element-ui'
    ]
  },
  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]'
  },
  resolve: { extensions: ['.js', '.vue', '.json'], alias: { 'vue$': 'vue/dist/vue.esm.js'}},
  plugins: [
    // 清除之前的dll文件
    new CleanWebpackPlugin(['*.*'], {
      root: path.join(__dirname, dllPath)
    }),
    // 设置环境变量
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: 'production'
      }
    }),
    // 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()
    })
  ]
}