为IE 10/11转译NextJS; “弱集未定义”

我有一个正在构建的NextJS网站，它很棒，但是它不能在IE 10/11中正常工作，因为某些代码没有正确地转译。我对babel和webpack真的很不好，以前从来没有自己配置过它们。我一直在尝试通过在线阅读来解决两天，似乎没有任何工作适合我。

我得到的确切错误是weakSet is not defined，它来自common.js文件。

这是我的.babelrc文件，位于项目的根目录中。

// .babelrc

{
    "presets": ["next/babel"],
    "plugins": [
        ["styled-components", { 
            "ssr": true, 
            "displayName": true, 
            "preprocess": false 
        }]
    ]
}

我的package.json

{
  "name": "bradshouse",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "next",
    "build": "next build",
    "start": "next start"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "next": "^7.0.2",
    "react": "^16.6.0",
    "react-dom": "^16.6.0",
    "react-pose": "^4.0.1",
    "styled-components": "^4.0.2"
  },
  "devDependencies": {
    "babel-plugin-styled-components": "^1.8.0"
  }
}

如果您有兴趣自己启动完整的repo，请点击这里。节点模块被排除在外，因此npm install，然后npm run build，然后npm run start。
https://github.com/TJBlackman/Brads-House

谢谢您的帮助！随意链接文章，我将彻底阅读它们！谢谢。

Edit: As a quick fix, I added this polyfill script to the <head> of all my pages, and it still did not fix this issue... Wat?! <script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>