将react小部件嵌入到4个站点时发生Polyfill冲突

webpack 4.29.3 和 babel 7 webpack-dev-server production <script type="text/javascript" src="myWidget.js"></script> html中的标记。我的网页配置如下:(我已经包括 babel-polyfill )

const HtmlWebPackPlugin = require("html-webpack-plugin");

module.exports = env => {
let htmlTemplate = "./public/index.html";
return {
    entry: [ "@babel/polyfill","./src/index.js"],
    output: {
        path: __dirname + '/dist',
        filename: 'chat.js',
        library: 'Chat',
        libraryTarget: 'umd',
        umdNamedDefine: true
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                }
            },
            {
                test: /\.css$/,
                use: ["style-loader", "css-loader"]
            }
        ]
    },
    plugins: [
        new HtmlWebPackPlugin({
            template: htmlTemplate,
            filename: "./index.html",
            inject: 'head'
        })
    ]
}};

  {
  "presets": [
    "@babel/env",
    "@babel/preset-react"
  ],
  "plugins": [
    "@babel/plugin-proposal-class-properties"
  ]
}

但是当我尝试将这个小部件嵌入到一个用Angular4编写的站点时,它说 TypeError: t.finally is not a function 虽然我已经包括了 polyfill 在react网页包版本中。我发现原因是 zone.js 在巴别塔多边形填充中。当我更新主机站点时(角度站点) 区域.js 版本来自 0.8.14 0.8.26 可嵌入小部件工作正常。我的问题是在实际场景中,我无法控制嵌入小部件的主机站点。那么在这种情况下,我该如何克服呢?