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Tree Shaking和DCE
2022-07-28 10:29:00 【差不少】
Tree Shaking和DCE
Tree Shaking 指的就是当我引入一个模块的时候,我不引入这个模块的所有代码,我只引入我需要的代码,这就需要借助 webpack 里面自带的 Tree Shaking 这个功能来帮我们实现。
https://blog.csdn.net/weixin_45820444/article/details/108845845
Tree-shaking的本质是消除无用的js代码。无用代码消除在广泛存在于传统的编程语言编译器中,编译器可以判断出某些代码根本不影响输出,然后消除这些代码,这个称之为DCE(dead code elimination)。
Tree-shaking 是 DCE 的一种新的实现,Javascript同传统的编程语言不同的是,javascript绝大多数情况需要通过网络进行加载,然后执行,加载的文件大小越小,整体执行时间更短,所以去除无用代码以减少文件体积,对javascript来说更有意义。
Tree-shaking 和传统的 DCE的方法又不太一样,传统的DCE 消灭不可能执行的代码,而Tree-shaking 更关注宇消除没有用到的代码。下面详细介绍一下DCE和Tree-shaking。
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