const path = require('path');
const UglifyPlugin = require('uglifyjs-webpack-plugin')
function resolve(dir) {
  // __dirname项目根目录的绝对路径
  return path.join(__dirname, dir);
}
module.exports = {
  lintOnSave: false,
  publicPath: './',
  chainWebpack: config => {
    config.resolve.alias
      .set('@', resolve('src'))
    const svgRule = config.module.rule('svg');
    // 清除已有的所有loader
    // 如果你不这样做，接下来的loader会附加在该规则现有的loader之后
    svgRule.uses.clear();
    svgRule
      .test(/\.svg$/)
      .include.add(path.resolve(__dirname, './src/svgicons/svg'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      });
    const fileRule = config.module.rule('file');
    fileRule.uses.clear();
    fileRule
      .test(/\.svg$/)
      .exclude.add(path.resolve(__dirname, './src/svgicons/svg'))
      .end()
      .use('file-loader')
      .loader('file-loader');

    config.module
      .rule("fonts")
      .test(/.(ttf|otf|eot|woff|woff2)$/)
      .use("url-loader")
      .loader("url-loader")
      .tap(options => {
        options = {
          limit: 10000,
        }
        return options
      })
      .end()
  },
  configureWebpack: (config) => {
    //  引入uglifyjs-webpack-plugin
    let UglifyPlugin = require('uglifyjs-webpack-plugin');

    if (process.env.NODE_ENV == 'production') {
      // 为生产环境修改配置
      config.mode = 'production'
      // 将每个依赖包打包成单独的js文件
      let optimization = {
        minimizer: [new UglifyPlugin({
          uglifyOptions: {
            warnings: false,
            compress: {
              drop_console: true,
              drop_debugger: false,
              pure_funcs: ['console.log']
            }
          }
        })]
      }
      Object.assign(config, {
        optimization
      })
    } else {
      // 为开发环境修改配置
      config.mode = 'development'
    }
  }
}