'use strict'
// Template version: 1.2.6
// see http://vuejs-templates.github.io/webpack for documentation.
// path是node.js的路径模块，用来处理路径统一问题
const path = require('path')

module.exports = {
  dev: {
    // Paths
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
      '/api': {
        target: 'http://localhost:3000/',
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      }
    },

    // Various Dev Server settings
    host: '127.0.0.1', // can be overwritten by process.env.HOST
    port: 8081, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: true,
    errorOverlay: true,
    notifyOnErrors: false,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-

    // Use Eslint Loader?
    // If true, your code will be linted during bundling and
    // linting errors and warnings will be shown in the console.
    useEslint: true,
    // If true, eslint errors and warnings will also be shown in the error overlay
    // in the browser.
    showEslintErrorsInOverlay: false,

    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'cheap-source-map',

    // CSS Sourcemaps off by default because relative paths are "buggy"
    // with this option, according to the CSS-Loader README
    // (https://github.com/webpack/css-loader#sourcemaps)
    // In our experience, they generally work as expected,
    // just be aware of this issue when enabling this option.
    cssSourceMap: false
  },
  //下面是生产编译环境下的一些配置
  build: {
    // 下面是相对路径的拼接，配置index属性的属性值
    index: path.resolve(__dirname, '../dist/index.html'),
    // 定义静态资源的根目录
    assetsRoot: path.resolve(__dirname, '../dist'),
    // 定义静态资源根目录的子目录
    assetsSubDirectory: 'static',
    /**
     * You can set by youself 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 '/' !!!
     */
    //定义静态资源的公开路径，也就是真正的引用路径
    assetsPublicPath: '/dcms/',

    //定义是否生成生产环境的SourceMap， sourcemap是用来debug编译后文件的，通过映射到编译前文件来实现
    productionSourceMap: false,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: 'source-map',

    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    // 是否在生产环境中压缩代码，如果要压缩必须安装compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],

    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report || false,

    // `npm run build:prod --generate_report`
    generateAnalyzerReport: process.env.npm_config_generate_report || false
  }
}
