Javascript 2020年polyfill js应用程序使用网页包的最佳方式？

我觉得我做错了什么，杀伤力过大或者错过了什么。请帮我安装

B.法律改革委员会

webpack.config.js

package.json

最后是我的server.js

  "presets": [
    [
      "@babel/preset-env",
      {
        "debug": true,
        "useBuiltIns": "usage",
        "corejs": 3
      }
    ],
    "@babel/preset-react"
  ],
  "plugins": ["@babel/plugin-proposal-class-properties", "@babel/plugin-transform-runtime"]
}

...
  use: {
    loader: 'babel-loader',
    options: {
      presets: ['@babel/preset-env', '@babel/preset-react'],
      plugins: ['@babel/plugin-proposal-class-properties']
    }
  },
...

"devDependencies": {
    "@babel/core": "^7.8.4",
    "@babel/plugin-proposal-class-properties": "^7.8.3",
    "@babel/plugin-transform-runtime": "^7.9.0",
    "@babel/preset-env": "^7.8.4",
    "@babel/preset-react": "^7.8.3",
    "@babel/runtime-corejs3": "^7.9.2",
    "babel-loader": "^8.0.6",
    "core-js": "^3.6.4",
...

...
import 'core-js/stable';
import 'regenerator-runtime/runtime';
...