The code we want to trasform: 2 ** 3; a ** b; a **b * c; a ** b ** c; (a+1) ** (b+1); transform to: Math.pow(2, 3); Math.pow(a, b); Math.pow(a, b) * c; Math.pow(a, Math.pow(b, c)); Math.pow(a+1, b+1); Code: export default function (babel) { const { t…

For example we have current code: function add(a, b) { console.log(a, b) return a + b } function subtract(a, b) { console.log(a, b) return a - b } add(, ) subtract(, ) console.log('sup dawg') We want to transform the code to: function add(a, b) { con…

Continue with previous post: https://www.cnblogs.com/Answer1215/p/12342540.html Now we need to think about functionExpression and ArrowFunction: function add(a, b) { console.log(a, b) return a + b } function subtract(a, b) { console.log(a, b) return…

We want to write a Babel Plugin, which move 'const versionRegex = /(/d+)\.(/d+)\.(/d+)/gi' out of function scope and put it into global scope. Code: function getVersion(versionString) { const versionRegex = /(\d+)\.(\d+)\.(\d+)/gi var x = /foo/.text(…

babel在现在的web 应用开发上具有很重要的作用,帮助我们做了好多事情,同时又有 比较多的babel plugin 可以解决我们实际开发上的问题. 以下只是学习下如果编写一个简单的babel plugin,项目使用lerna 进行代码包管理 插件开发模型 项目准备 lerna 项目初始化 lerna init 创建plugin package lerna create MyFirstBabelPlugin 创建使用plugin 的package lerna create PluginUsag…

https://www.fullstackreact.com/articles/what-are-babel-plugins-and-presets/ 当开发react或者vuejs app时,开发者可能经常需要在不同的babel configuration(.bablerc)中切换.你应该在package.json文件中见到过以下代码: // package.json { "babel": { "presets": [ "es2015", &q…

Continue with the previous post: https://www.cnblogs.com/Answer1215/p/12337243.html What we want to do in this post, is adding parent function name into the console log as well: Previous output is : function add(a, b) { console.log("2:4", a, b)…

a = () => {}, // Support for the experimental syntax 'classProperties' isn't currently enabled yarn add @babel/plugin-proposal-class-properties --dev @babel/plugin-transform-runtime 有async await 时候, 要用中间件 redux-thunk…

To write a simple Babel plugin, we can use http://astexplorer.net/ to help us. The plugin we want to write is: var foo = 'o' var bar = 'o' foo === bar function foo(foo, bar) { foo === bar; } We want to trasnform the code which highlighted in foo() fu…

在前端圈子里,对于 Babel,大家肯定都比较熟悉了.如果哪天少了它,对于前端工程师来说肯定是个噩梦.Babel 的工作原理是怎样的可能了解的人就不太多了.本文将主要介绍 Babel 的工作原理以及怎么写一个 Babel 插件. Babel 是怎么工作的 Babel 是一个 JavaScript 编译器. 做与不做 注意很重要的一点就是,Babel 只是转译新标准引入的语法,比如: 箭头函数 let / const 解构 哪些在 Babel 范围外?对于新标准引入的全局变量.部分原生对象新增的原…