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  • treeShake

    2019-07-09 12:29:49
    1.treeShake的作用是什么: 2.treeShake原理是什么: ES6模块依赖关系是确定的,和运行时的状态无关,可以进行可靠的静态分析,这就是 tree-shaking的基础。所谓静态分析就是不执行代码,从字面量上对代码进行分析...

    segmentfault.com/a/119000001… juejin.im/post/5a4dca…

    
    而在js运行时会进行三件事:1语法分析  2.预编译  3.解释执行
    语法分析会在代码执行前对代码进行通篇检查,以排除一些低级错误
    预编译发生在代码执行的前一刻
    解释执行顾名思义就是执行代码
    
    
    js编译器:https://www.zhihu.com/question/25254230
    首先对源码进行分析(类似编译器前端做的工作:词法,语法分析等),得到AST后,
    进一步分析(数据流,控制流分析,类型系统等),获取到一些有用的信息(类似智能
    提示的那种,比如类型变换情况,转换是否安全,空指针检测,是否有潜在的bug等),
    帮助我们写出安全的代码.
    
    1.treeShake的作用是什么:
    2.treeShake原理是什么:
        ES6模块依赖关系是确定的,和运行时的状态无关,可以进行可靠的静态分析,这就是
        tree-shaking的基础。所谓静态分析就是不执行代码,从字面量上对代码进行分析,
        ES6之前的模块化,比如我们可以动态require一个模块,只有执行后才知道引用的什么模块,这个就不能通过静态分析去做优化。
    --------------------------------------------------------------------------------
        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
    --------------------------------------------------------------------------------
        ES6的模块引入是静态分析的,故而可以在编译时正确判断到底加载了什么代码。
    --------------------------------------------------------------------------------
        分析程序流,判断哪些变量未被使用、引用,进而删除此代码。
    --------------------------------------------------------------------------------
    rollup只处理函数和顶层的import/export变量,不能把没用到的类的方法消除掉javascript动态语言的特性
    使得静态分析比较困难图7下部分的代码就是副作用的一个例子,如果静态分析的时候删除里run或者jump,程序运行时就可能报错,那就本末倒置了
    ,我们的目的是优化,肯定不能影响执行
    3.treeShake是函数级别还是文件级别:
    复制代码

    转载于:https://juejin.im/post/5d2459e751882556d16828ee

    展开全文
  • Treeshake classes

    2020-12-01 17:39:13
    <div><p><code>/**/</code> is what uglify may eliminate if no usages is found. Sadly typescript does not provide correct annotation here.</p><p>该提问来源于开源项目:mui-org/material-ui-pickers...
  • Tree shake graphql?

    2021-01-10 18:21:45
    <div><p>If I'm not using graphql, it&...s possible to make the graphql dep tree-shakeable? <p>Sorry, I don't think the template applies here.</p><p>该提问来源于开源项目:mswjs/msw</p></div>
  • Tree shake unused adapters

    2020-12-28 05:28:59
    <div><p>This PR addresses #24 so adapters referenced in <code>config.metricsAdapters</code> and <code>config['ember-metrics'].includeAdapters</code> are bundled into the application....
  • t treeshake grommet-icons, causing the package to be 70% taken up with grommet-icons. <p><strong>Built with: Webpack 4x <p><strong>Replicate: CRA with typescript, add grommet + grommet-icons(peer...
  • Tree shake big bundle size

    2021-01-11 06:26:13
    <div><p>I'm trying the amazing Shoelace for the first time today. <p>I'... <strong>Can we tree-shaking?</strong></p>该提问来源于开源项目:shoelace-style/shoelace</p></div>
  • <div><p>该提问来源于开源项目:react-bootstrap/dom-helpers</p></div>
  • ), cannot be effectively tree-shaken (well, dead code eliminated to be more exact), because of the heavy <code>curry</code> usage. It is like that because bundlers/minifiers cannot know for sure that ...
  • <p>We have two options: <em>modularize</em> into super tiny modules <strong>or</strong> use <em>tree shaking</em></p> <h3>Modularization <p>For modularization we'd need to publish a bunch of npm ...
  • <div><p>Import common/helpers...removed in the webpack tree-shaking process. This would ensure plugins can import methods from the common/helpers. 该提问来源于开源项目:theforeman/foreman</p></div>
  • <div><p>Closes #29</p><p>该提问来源于开源项目:DockYard/ember-composable-helpers</p></div>
  • <div><p>1st of all, I happy to see this official library get done. FA5 is really awesome and I know there are quite a lot of modern webprojects with Angular+Boostrap that are definitively going to...
  • and he clued me in that consumers will have more luck tree-shaking our ES modules if TypeScript targets something newer than <code>es5</code> during compilation. <p>i don't see a downside to this...

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