'use strict'
const px2rem = require('postcss-px2rem')
const path = require('path')
const postcss = px2rem({
  remUnit: 20   //基准大小 baseSize，需要和rem.js中相同
});

const defaultSettings = require('./src/settings.js')

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

const name = defaultSettings.title // page title



module.exports = {
  publicPath: './',
  lintOnSave: process.env.NODE_ENV === 'dev',
  productionSourceMap: false,
  configureWebpack: config => {
    config.name = name;
    config.externals = {
      BMap: "BMap"
    };
    config.resolve.modules = [path.resolve('node_modules'), 'node_modules'];

    // 是否生产环境
    if (process.env.NODE_ENV !== "dev") {
      // 忽略输出 Pass true to discard calls to console.* functions.
      config.optimization.minimizer[0].options.terserOptions.compress.drop_console = true;
    }
  },
  css: {
    loaderOptions: {
      css: {},
      postcss: {
        plugins: [
          postcss
        ]
      }
    }
  },
  devServer: {
    https: false
  },
  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')

    // swf loader
    config.module.rule('swf')
      .test(/\.swf/)
      .use('url-loader')
      .loader('url-loader')
      .options({ limit: 10000 })

    config
      .when(process.env.NODE_ENV !== 'dev',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          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
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                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')
        }
      )
  },
}