webpack配置babel打包之后依然带有es6语法怎么办？

Question

babel配置如下

{
    "presets": [
        ["env", {
            "modules": false
        }],
        "stage-2"
    ],
    "plugins": [
        ["transform-runtime", {
            "helpers": false,
            "polyfill": false,
            "regenerator": true,
            "moduleName": "babel-runtime"
        }]
    ]
}

webpack.common.js配置如下：

/**
 * Created by MBJ20180827S1 on 2018/10/19.
 */
const webpack = require("webpack");
const path = require('path');
const glob = require('glob');
const HtmlWebpackPlugin = require('html-webpack-plugin'); // html引擎
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackInlineSourcePlugin = require('html-webpack-inline-source-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
function buildEntriesAndHTML() {
    // 用来构建entery
    const result = glob.sync('views/**/*.js');
    const config = {
        hash: false,
        inject: true
    };
    const entries = {};
    const htmls = [];
    result.forEach(item => {
        const one = path.parse(item);
        const outputfile = one.dir.split('/').slice(-1)[0];
        entries[outputfile] = './' + item;
        htmls.push(
            new HtmlWebpackPlugin({
                ...config,
                template: './' + one.dir + '/index.html',
                filename: './' + outputfile + '/index.html', // 输出html文件的路径
                title:outputfile+'通用模版',
                chunks: [outputfile]
            })
        );
    });
    if (htmls.length > 0) {
        htmls.push(new HtmlWebpackInlineSourcePlugin());
    }
    return {
        entries,
        htmls
    };
}
const final = buildEntriesAndHTML();

module.exports = {
    entry: final.entries,
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    {loader: 'postcss-loader', options: {plugins: [require("autoprefixer")("last 100 versions")]}}
                ]
            },
            {
                test: /\.less$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader?importLoaders=1',
                    {loader: 'postcss-loader', options: {plugins: [require("autoprefixer")("last 100 versions")]}},
                    'less-loader'
                ]
            },
            {
                test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
                /*use:[
                 {
                 loader: 'url-loader',
                 options: {
                 limit: 1024 * 10,
                 name: 'image/[name].[ext]',
                 fallback: 'file-loader'
                 }
                 },
                 {
                 loader: 'image-webpack-loader',// 压缩图片
                 options: {
                 bypassOnDebug: true,
                 }
                 }
                 ]*/
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: 'image/[name].[ext]',
                        }
                    },
                    {
                        loader: 'image-webpack-loader',// 压缩图片
                        options: {
                            bypassOnDebug: true,
                        }
                    }
                ]
            },
            {
                test: /\.(mp4|webm|ogg|mp3|wav|flac|aac|swf|mov)(\?.*)?$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: 'media/[name].[hash:7].[ext]',
                        }
                    },
                ]
            },
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                }
            },
            {
                test: /\.html$/,
                use: [
                    {
                        loader: "html-loader",
                        options: {minimize: true} // 加载器切换到优化模式，启用压缩。
                    }
                ]
            }
        ]
    },
    plugins: [
        new OptimizeCSSAssetsPlugin({
            assetNameRegExp: /\.css\.*(?!.*map)/g,  //注意不要写成 /\.css$/g
            cssProcessor: require('cssnano'),
            cssProcessorOptions: {
                discardComments: {removeAll: true},
                // 避免 cssnano 重新计算 z-index
                safe: true,
                // cssnano 集成了autoprefixer的功能
                // 会使用到autoprefixer进行无关前缀的清理
                // 关闭autoprefixer功能
                // 使用postcss的autoprefixer功能
                autoprefixer: false
            },
            canPrint: true
        }),
        new MiniCssExtractPlugin({
            filename: '[name]/[name].css',
            chunkFilename: '[name].css'
        }),
        ...final.htmls
    ],
    resolve: {
        extensions: ['.js', '.json', '.jsx', '.css']
    },
}

Answer 1

应该是要安装 @babel/plugin-transform-typeof-symbol (Babel 7)
21 分钟精通前端 Polyfill 方案