'use strict'
const path = require('path')

const port = process.env.port || process.env.npm_config_port || 4949
const baseUrl = process.env.VUE_APP_BASE_URL

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

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  publicPath: '/mall',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      '/dev-api': {
        target: baseUrl,
        pathRewrite: {
          '^/dev-api': '/'
        },
        secure: false,
        changeOrigin: true
      },
      'upload': {
        target: baseUrl,
        secure: false,
        changeOrigin: true
      }
    }
  },
  configureWebpack: {
    devtool: 'source-map',
    name: 'panda-mall',
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    // 打包配置
    performance: {
      hints: 'warning',
      // 入口起点的最大体积 整数类型（以字节为单位）
      maxEntrypointSize: 50000000,
      // 生成文件的最大体积 整数类型（以字节为单位 300k）
      maxAssetSize: 30000000,
      // 只给出 js 文件的性能提示
      assetFilter: function(assetFilename) {
        return assetFilename.endsWith('.js')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    })
  },
  css: {
    loaderOptions: {
      less: {
        // 若 less-loader 版本小于 6.0，请移除 lessOptions 这一级，直接配置选项。
        modifyVars: {
          // 直接覆盖变量
          'tabbar-item-icon-size': '24px'
        }
      }
    }
  }
}