const path = require('path')
function resolve(dir) {
  return path.join(__dirname, dir)
}

module.exports = {
  publicPath: './',
  outputDir: process.env.VUE_APP_outputDir || 'dist',
  assetsDir: 'static',
  filenameHashing: true,
  lintOnSave: false,
  runtimeCompiler: false,
  transpileDependencies: [],
  productionSourceMap: false,
  css: {
    // 是否使用css分离插件 ExtractTextPlugin
    extract: process.env.NODE_ENV === 'production' ? true : false,
    sourceMap: false,
    // requireModuleExtension: true,
    loaderOptions: {
      sass: {
        prependData: `@import "@/assets/css/variable.scss";`
      }
    }
  },

  chainWebpack: config => {
    config.plugin('html').tap(args => {
      args[0].title = '黑龙江省哈尔滨市2024年老旧小区改造项目EPC工程总承包（七标段）'
      return args
    })

    // 配置别名
    config.resolve.alias.set('@', resolve('src')).set('assets', resolve('src/assets')).set('components', resolve('src/components')).set('views', resolve('src/views')).set('api', resolve('src/api'))

    if (process.env.NODE_ENV === 'production') {
      // 删除系统默认的splitChunk
      config.optimization.delete('splitChunks')
    }
  },
  configureWebpack: config => {
    // 给输出的js名称添加hash
    config.output.filename = 'static/js/[name].[hash].js'
    config.output.chunkFilename = 'static/js/[name].[hash].js'
    config.optimization = {
      splitChunks: {
        cacheGroups: {
          // 抽离所有入口的公用资源为一个chunk
          common: {
            name: 'chunk-common',
            chunks: 'initial',
            minChunks: 2,
            maxInitialRequests: 5,
            minSize: 0,
            priority: 1,
            reuseExistingChunk: true,
            enforce: true
          },
          datav: {
            name: 'chunk-datav',
            test: /[\\/]node_modules[\\/]@jiaminghi[\\/]data-view[\\/]/,
            chunks: 'all',
            priority: 4,
            reuseExistingChunk: true,
            enforce: true
          }
        }
      }
    }
  },

  // 是否为 Babel 或 TypeScript 使用 thread-loader。该选项在系统的 CPU 有多于一个内核时自动启用，仅作用于生产构建。
  parallel: require('os').cpus().length > 1,

  devServer: {
    proxy: {
      '/x_program_center': {
        target: 'http://www.harbinxiaoshi.cn:8000',
        pathRewrite: {
          '^/x_program_center': ''
        }
      }
    }
  }
}