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<article id="post-treeshaking" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/09/14/treeshaking/">webpack2之tree shaking</a>
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<a href="/2017/09/14/treeshaking/" class="archive-article-date">
<time datetime="2017-09-13T23:00:00.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-09-14</time>
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<p>译文：<a href="http://2ality.com/2015/12/webpack-tree-shaking.html" target="_blank" rel="external">http://2ality.com/2015/12/webpack-tree-shaking.html</a></p>
<blockquote>
<p>作者: Dr. Axel Rauschmayer, Twitter, Mastodon</p>
</blockquote>
<p>tree shaking, 顾名思义：摇树，把树上面的枯枝烂叶子甩下来，目的是减小bundle size。这个构建优化手段起源于另一个打包工具<a href="https://github.com/rollup/rollup" target="_blank" rel="external">rollup</a>.</p>
<h3 id="工作原理"><a href="#工作原理" class="headerlink" title="工作原理"></a>工作原理</h3><p>举例有es6模块如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">export function foo() {</div><div class="line"> return 'foo';</div><div class="line">}</div><div class="line">export function bar() {</div><div class="line"> return 'bar';</div><div class="line">}</div></pre></td></tr></table></figure>
<p>首先，webpack将所有的es6 module打包到bundle文件里面。那些从来没有被import的export, 不再被export， 变成了<a href="https://en.wikipedia.org/wiki/Dead_code" target="_blank" rel="external">dead code</a>。 dead code就是在编译时不被export或者跟本用不到的函数、变量等等。比如代码中的bar.</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line">function(module, exports, __webpack_require__) {</div><div class="line"></div><div class="line"> /* harmony export */ exports["foo"] = foo;</div><div class="line"> </div><div class="line"> /* unused harmony export bar */;</div><div class="line"></div><div class="line"> function foo() {</div><div class="line"> return 'foo';</div><div class="line"> }</div><div class="line"> // i am dead function .... </div><div class="line"> function bar() {</div><div class="line"> return 'bar';</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>需要注意的是， babel-preset-es2015默认会用transform-es2015-modules-commonjs把es6 module处理成commonjs。这就干掉了es6 module的静态特性。但是由于cmd模块系统是个对象，运行时才能确定模块的特定属性，那么在编译时就不能确定哪些exports是没用的了。模块将被转化成为如下cmd：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line">function(module, exports) {</div><div class="line"> 'use strict';</div><div class="line"> Object.defineProperty(exports, "__esModule", {</div><div class="line"> value: true</div><div class="line"> });</div><div class="line"> exports.foo = foo;</div><div class="line"> exports.bar = bar;</div><div class="line"> function foo() {</div><div class="line"> return 'foo';</div><div class="line"> }</div><div class="line"> function bar() {</div><div class="line"> return 'bar';</div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>目前babel有个简单的配置可以跳过模块的处理, 保留es6 module：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">module: false;</div></pre></td></tr></table></figure></p>
<p>然后，利用ulglify工具干掉dead code, 进行混淆:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">function (t, n, r) {</div><div class="line"> function e() {</div><div class="line"> return "foo"</div><div class="line"> }</div><div class="line"> n.foo = e</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>最后对bundle进行压缩操作, 有效减小了bundle文件体积。</p>
<p>下面一段是瞎写写的：</p>
<p>有些人觉得自己不会写出这些dead code、垃圾代码，因而怀疑tree shaking的意义。其实现在很多库是设计成可以按需加载的，如echarts, rxjs, ramda，目的就是为了不引入所有的代码， 减小bundle体积。比如工具类的ramda有各种list, object, logic的各种方法， 你可能只用到了一个，是不需要将所有的方法都打包到bundle里面的。echarts可能只用到柱状图，也不需要把其他所有种类的图形打包起来， 这个太大了。就算现在网速快，流量也是要钱的。。。</p>
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<a class="article-title" href="/2017/08/28/babel/">关于Babel与构建优化</a>
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<time datetime="2017-08-28T07:38:15.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-08-28</time>
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<h1 id="1-preset"><a href="#1-preset" class="headerlink" title="1.preset-*"></a>1.preset-*</h1><h3 id="官方preset"><a href="#官方preset" class="headerlink" title="官方preset"></a><a href="https://babeljs.io/docs/plugins/#presets-official-presets" target="_blank" rel="external">官方preset</a></h3><p>举例：preset-es2015将ES6编译成ES5，preset-2017处理2017中的语法特性.</p>
<h3 id="babel-preset-env"><a href="#babel-preset-env" class="headerlink" title="babel-preset-env"></a><a href="https://babeljs.io/docs/plugins/preset-env/" target="_blank" rel="external">babel-preset-env</a></h3><p>支持所有es标准的特性，能够根据配置采用特定语法处理插件。比方说配置成支持chrome 56, 很多es6已经支持了，就不需要在转成一大坨es5了，减小了bundle的体积。原理比较粗暴，他参考<a href="https://github.com/kangax/compat-table" target="_blank" rel="external">compat-table</a> 把每个浏览器版本支持哪些特性都写在本地的文件里了。</p>
<h3 id="preset-latest"><a href="#preset-latest" class="headerlink" title="preset-latest"></a><a href="https://babeljs.io/docs/plugins/#presets-stage-x-experimental-presets-" target="_blank" rel="external">preset-latest</a></h3><p>顾名思义，最新的，包括所有的官方preset-*, 但是已经deprecated, 因为env的存在。</p>
<h3 id="stage-X"><a href="#stage-X" class="headerlink" title="stage-X"></a><a href="https://babeljs.io/docs/plugins/#presets-stage-x-experimental-presets-" target="_blank" rel="external">stage-X</a></h3><p>相对于preset-*, 此插件支持尚未被发布为es标准的实验性质的语法特性，意思就是后面可能会被干掉的。比如说object-rest-spread.<br>这个比较蛋疼，只能说是特定时间，处于某个状态（0，1，2，3，4）的一系列特性的集合。 babel正在考虑废除，因为直接配置插件更加直观。</p>
<p>babel处于构建时，只处理语法，不处理api.</p>
<h1 id="2-babel-core-标准库"><a href="#2-babel-core-标准库" class="headerlink" title="2. babel-core(标准库)"></a>2. babel-core(标准库)</h1><p>顾名思义，核心！核心！核心！各种es5,6,7各种polyfill。<br>例如对Arry.from进行Polyfill:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">var core = require('core-js/library');</div><div class="line">core.Array.from(new core.Set([1, 2, 3, 2, 1]));</div></pre></td></tr></table></figure></p>
<h1 id="3-babel-runtime"><a href="#3-babel-runtime" class="headerlink" title="3. babel-runtime"></a>3. babel-runtime</h1><p>由core-js 与 regenerator-runtime构成。<br>使用方法：const Promise = require(‘babel-runtime/core-js/promise’), 比较原始。<br>供编译模块复用工具函数, 主要目的是减小包体积。对比babel-polyfill, 后者是会污染全局的，使用也很粗暴：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">import 'babel-polyfill';</div></pre></td></tr></table></figure></p>
<h1 id="4-babel-plugin-transform-runtime-babel-polyfill"><a href="#4-babel-plugin-transform-runtime-babel-polyfill" class="headerlink" title="4. babel-plugin-transform-runtime, babel-polyfill"></a>4. babel-plugin-transform-runtime, babel-polyfill</h1><p>transform-runtime对于JavaScript新增的API和一些全局对象上的方法，在运行时动态插入兼容补丁，避免在每个文件插入重复的补丁。调试的时候可以看一下每个文件头部被插入了一段的代码。<br>配置简单(.babelrc)，比babel-runtime更加智能，实际上是站在babel-runtime的肩膀上，而babel-runtime是站在了babel-core的肩膀上。<br>容易和babel-polyfill搞混。参考知乎上的一篇<a href="https://zhuanlan.zhihu.com/p/29058936" target="_blank" rel="external">文章</a>。<br>主要区别在于babel-polyfill侵入性太强，会修改builtins 和 prototype, 类似于很早的prototype.js, 因此绝对不能用来搞轮子，容易破坏别人的轮子。babel-plugin-transform-runtime采用sandbox，不修改全局变量, 而且不修改prototype， 适合开发第三方库。</p>
<h1 id="5-babel-register-babel-node"><a href="#5-babel-register-babel-node" class="headerlink" title="5. babel-register,babel-node"></a>5. babel-register,babel-node</h1><p>其他参考阮老师文章 <a href="http://www.ruanyifeng.com/blog/2016/01/babel.html" target="_blank" rel="external">http://www.ruanyifeng.com/blog/2016/01/babel.html</a></p>
<h1 id="关于构建优化"><a href="#关于构建优化" class="headerlink" title="关于构建优化"></a>关于构建优化</h1><p>对于后台系统开发，大部分情况下可以考虑现在浏览器. 由于目前现在浏览器对es6的适配已经非常高了，chrome60达到90%, 那么就没有必要将es6一股脑都编译成es5了。 我们只需要配置preset-env和一些transform插件就可以愉快地跑起来了。<br>对ts可以做同样的优化：先将ts编译的target设置为es6, 再送到babel按浏览器环境进行polyfill， 最终在浏览器里调试的代码要好看的多。我觉得最好的一点就可以保留class， 而不是其他的方式去实现它。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line">{</div><div class="line"> "presets": [</div><div class="line"> ["env", {</div><div class="line"> "modules": false,</div><div class="line"> "debug": true,</div><div class="line"> "targets": {</div><div class="line"> "chrome": 56</div><div class="line"> }</div><div class="line"> }]</div><div class="line"> ],</div><div class="line"> "plugins": [</div><div class="line"> "transform-runtime",</div><div class="line"> "transform-object-rest-spread"</div><div class="line"> ],</div><div class="line">}</div></pre></td></tr></table></figure>
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<div class="tools-col" q-class="show:isShow,hide:isShow|isFalse" q-on="click:stop(e)">
<div class="tools-nav header-menu">
<ul style="width: 70%">
<li style="width: 33.333333333333336%" q-on="click: openSlider(e, 'innerArchive')"><a href="javascript:void(0)" q-class="active:innerArchive">所有文章</a></li>
<li style="width: 33.333333333333336%" q-on="click: openSlider(e, 'friends')"><a href="javascript:void(0)" q-class="active:friends">友链</a></li>
<li style="width: 33.333333333333336%" q-on="click: openSlider(e, 'aboutme')"><a href="javascript:void(0)" q-class="active:aboutme">关于我</a></li>
</ul>
</div>
<div class="tools-wrap">
<section class="tools-section tools-section-all" q-show="innerArchive">
<div class="search-wrap">
<input class="search-ipt" q-model="search" type="text" placeholder="find something…">
<i class="icon-search icon" q-show="search|isEmptyStr"></i>
<i class="icon-close icon" q-show="search|isNotEmptyStr" q-on="click:clearChose(e)"></i>
</div>
<div class="widget tagcloud search-tag">
<p class="search-tag-wording">tag:</p>
<label class="search-switch">
<input type="checkbox" q-on="click:toggleTag(e)" q-attr="checked:showTags">
</label>
<ul class="article-tag-list" q-show="showTags">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">webpack</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">babel</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">工程化</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">通信</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">IM</a>
</li>
<div class="clearfix"></div>
</ul>
</div>
<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
<li class="search-li" q-repeat="items" q-show="isShow">
<a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
</p>
<p class="search-tag">
<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
</p>
</li>
</ul>
</section>
<section class="tools-section tools-section-friends" q-show="friends">
<ul class="search-ul">
<li class="search-li">
<a href="http:t66y.com" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接1</a>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">很惭愧, 没啥干货...</div>
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>