// Explanation of each configuration item You can find it in https://cli.vuejs.org/config/

const path = require('path')

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

module.exports = {
  /**
   * You can set by yourself according to actual condition
   * You will need to set this if you plan to deploy your site under a sub path,
   * for example GitHub pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then assetsPublicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail https://cli.vuejs.org/config/#baseurl
   */
  baseUrl: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV !== 'production',
  productionSourceMap: false,
  devServer: {
    port: 9528,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    }
    // proxy: {}
  },

  configureWebpack: {
    // We provide the app's title in Webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: 'vue-admin-template',
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack: config => {
    config.plugins.delete('preload')
    config.plugins.delete('prefetch')
    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.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // 只打包初始时依赖的第三方
                },
                elementUI: {
                  name: 'chunk-elementUI', // 单独将 elementUI 拆包
                  priority: 20, // 权重要大于 libs 和 app 不然会被打包进 libs 或者 app
                  test: /[\\/]node_modules[\\/]element-ui[\\/]/
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  }
}