is set up in the workspace configuration s uch that all builds make use of bundling, limited tree-shaking, and also limited dead code elimination. --progress Log progress to the console is set up in the workspace configuration such that all builds make use of bundling, limited tree-shaking, and also limited dead code elimination. 28 --progress=true|false Log progress to the console is set up in the workspace configuration such that all builds make use of bundling, limited tree-shaking, and also limited dead code elimination. 19 --progress=true|false Log progress to the console

cache/webpack，最⼤ 500MB，缓存时常两个星期，旧的缓存先淘汰。 webpack 5 webpack 4 构建优化：Tree Shaking 优化-嵌套的 Tree shaking webpack 5 webpack 4 构建优化：Tree Shaking 优化-内部模块 Tree shaking 代码⽣成：⽀持⽣成 ES6 代码 webpack 4 之前只⽣成 ES5 的代码。 webpack 5

tinypng:也是将24位png文件转化为更小有索引的8位图片，同时所有非必要的metadata 也会被剥离掉 tree shaking(摇树优化)复习 概念：1 个模块可能有多个方法，只要其中的某个方法使用到了，则整个文件都会被打到 bundle 里面去，tree shaking 就是只把用到的方法打入 bundle ，没用到的方法会在 uglify 阶段被擦除掉。 使用：webpack com/polyfill_service/v2/polyfill.min.js?unknown=polyfill&features=Promise,Map,Set 体积优化策略总结 Scope Hoisting Tree-shaking 图片压缩 动态 Polyfill 公共资源分离

minChunks: 2 } } } } } }; minuSize: 分离的包体积的⼤大⼩小 tree shaking(摇树优化) 概念：1 个模块可能有多个⽅方法，只要其中的某个⽅方法使⽤用到了了，则整个⽂文件都会被打到 bundle ⾥里里⾯面去，tree shaking 就是只把⽤用到的⽅方法打⼊入 bundle ，没⽤用到的⽅方法会在 uglify 阶段被擦除掉。 使⽤用：webpack 代码执⾏行行的结果不不会被⽤用到 代码不不会被执⾏行行，不不可到达 代码只会影响死变量量（只写不不读） if (false) { console.log('这段代码永远不会执行’); } Tree-shaking 原理理 利利⽤用 ES6 模块的特点: ·只能作为模块顶层的语句句出现 · import 的模块名只能是字符串串常量量 · import binding 是 immutable的

• Add operators on to the prototype • No tree shaking • Lettable operators • aka operator functions • Higher order functions • Yay tree shaking • Yay functional programming Lots more to come…

NAMES IN BINARY • SAVES A FEW BYTES • BECOMES MORE RELEVANT WHEN USING MANY SMALL MODULES • TREE SHAKING WASM EXPORTS • WE REMOVE THE EXPORTS, BUT HAVE NO DCE • WE NEED A WASM MINIMIZER! THE FUTURE CONSTRUCT FOR WASM? MY OPINION • MANY SMALL WASMS > ONE BIG WASM • SIMILAR TO JS, CODE SPLITTING, TREE SHAKING • HIDING ASYNC IS IMPORTANT FOR TRANSPARENT USAGE IN LIBRARIES • CODE SPLITTING STAYS IMPORTANT

WEBPACK 1 DOCS) NOV 2015: FIRST WEBPACK 2 BETA • ECMASCRIPT MODULES ARE NOW NATIVELY SUPPORTED • TREE SHAKING (UNUSED EXPORTS ELIMINATION) • INTERNAL CODE IS IN PROGRESS OF BEING UPGRADED TO ES2015 2016: OF CommonsChunkPlugin JAN 2018: ALPHA VERSION WEBPACK 4 • OPTIMIZATION IMPROVEMENTS • BETTER TREE SHAKING WITH THE sideEffects FLAG • MODULE TYPES: NATIVE SUPPORT FOR: • JS (CJS/AMD/ESM) • JSON •

运行环境 Dart source code Dart VM JavaScript source code dart2js Source map tree shaking minification Dart2js Tree-shaking ● 语言的设计影响性能 ● 使用snapshot启动速度快10倍 ● 运行时不能改变对象结构有利于VM优化 ● Dart VM 性能已超越 JavaScript

2 应用程序，我们强烈建议你等待迁移版本完成以获得更流畅的体验。 下面列出了从 2.x 开始的重大更改： 全局 Vue API 已更改为使用应用程序实例 全局和内部 API 已经被重构为可 tree-shakable 组件上 v-model 用法已更改