'use strict'
const webpack = require('webpack');
const production = process.env.NODE_ENV === 'production';
const path = require('path');

function resolve(dir) {
  return path.join(__dirname, dir);
}

// 相关配置请参考 https://cli.vuejs.org/config/
module.exports = {
  publicPath: production ? './' : '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 代理服务
  devServer: {
    port: 9090,
    // open: true, //禁用后只打开1次页面
    overlay: {
      warnings: false,
      errors: true
    }
  },
  configureWebpack: {
    resolve: {
      // 定义别名和插件位置
      alias: {
        '@': resolve('src'),
        'api': resolve('src/api'),
        'mock': resolve('src/mock'),
        'mixins': resolve('src/mixins'),
        'assets': resolve('src/assets'),
        'config': resolve('src/config'),
        'components': resolve('src/components'),
        'views': resolve('src/views'),
        'utils': resolve('src/utils'),
        'router': resolve('src/router'),
      }
    },
    plugins: [
      // new webpack.ProvidePlugin({
      //   $: 'jquery',
      //   jQuery: 'jquery',
      //   'window.jQuery': 'jquery',
      //   'root.jQuery': 'jquery'
      // })
    ],
    // 外部引用
    externals: {
      $: 'jquery'
    }
  },
  chainWebpack(config) {
    config.plugins.delete('preload')
    config.plugins.delete('prefetch')
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial'
                },
                elementUI: {
                  name: 'chunk-elementUI',
                  priority: 20,
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), 
                  minChunks: 3,
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  },
  css: {
    loaderOptions: {
      sass: {
        data: `
          @import "@/styles/variables.scss";
        `
      }
    }
  }
}