3-17 说一下关于tree-shaking的原理？(webpack部分)

Tree-Shaking 实现原理: https://zhuanlan.zhihu.com/p/403901557#:~:text=Tree-Shaking 是一种基于 ES Module 规范的 ,Dead%20Code%20Elimination%20%E6%8A%80%E6%9C%AF%EF%BC%8C%E5%AE%83%E4%BC%9A%E5%9C%A8%E8%BF%90%E8%A1%8C%E8%BF%87%E7%A8%8B%E4%B8%AD%E9%9D%99%E6%80%81%E5%88%86%E6%9E%90%E6%A8%A1%E5%9D%97%E4%B9%8B%E9%97%B4%E7%9A%84%E5%AF%BC%E5%85%A5%E5%AF%BC%E5%87%BA%EF%BC%8C%E7%A1%AE%E5%AE%9A%20ESM%20%E6%A8%A1%E5%9D%97%E4%B8%AD%E5%93%AA%E4%BA%9B%E5%AF%BC%E5%87%BA%E5%80%BC%E6%9C%AA%E6%9B%BE%E5%85%B6%E5%AE%83%E6%A8%A1%E5%9D%97%E4%BD%BF%E7%94%A8%EF%BC%8C%E5%B9%B6%E5%B0%86%E5%85%B6%E5%88%A0%E9%99%A4%EF%BC%8C%E4%BB%A5%E6%AD%A4%E5%AE%9E%E7%8E%B0%E6%89%93%E5%8C%85%E4%BA%A7%E7%89%A9%E7%9A%84%E4%BC%98%E5%8C%96%E3%80%82

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