babel

前言 ES6 虽提供了许多新特性，但我们实际工作中用到频率较高并不多，根据二八法则，我们应该用百分之八十的精力和时间，好好专研这百分之二十核心特性，将会收到事半功倍的奇效！写文章不容易，请大家多多支持与关注！ 本文首发地址 GitHub博客 一、开发环境配置 这部分着重介绍： babel 编译ES6语法，如何用webpack实现模块化。 1.babel 为啥需要babel？ ES6 提供了许多新特性，但并不是所有的浏览器都能够完美支持。下图是各个浏览器对ES6兼容性一览表(以export为例) 由上图可知，有些浏览器对于ES6并不是很友好，针对 ES6 的兼容性问题，很多团队为此开发出了多种语法解析转换工具(比如babel，jsx，traceur 等)，可以把我们写的 ES6 语法转换成 ES5，相当于在 ES6 和浏览器之间做了一个翻译官。其中 Babel 是一个广泛使用的转码器，可以将ES6代码转为ES5代码，从而在现有环境执行。 如何配置babel？ ·首先要先安装node.js，运行npm init，然后会生成package.json文件 ·npm install --save-dev babel-core babel-preset-es2015 babel-preset-latest ·创建并配置.babelrc文件//存放在项目的根目录下，与node_modules同级

It is stated here that Babel can extract gettext messages for Python and Javascript files. Babel comes with a few builtin extractors: python (which extracts messages from Python source files), javascript, and ignore (which extracts nothing). The command line extractor is documented here - but with no examples on usage. Also in the same pointer above, there is some mention of a config file to be used with extraction, but not much expanded on. When I run the basic command for the extractor on a dir with js files, I get only the .PO header generated but no messages. $ pybabel extract /path/to/js

I'm pretty new to both Python and Flask (with Jinja2 as template engine) and I am not sure I am doing it the right way. I am using Flask-Babel extension to add i18n support to my web application. I want to get localized strings from my js code, for instance: var helloWorld = gettext('Hello, world'); console.log(helloWorld); //should log a localized hello world message For this, I configured babel (babel.cfg): [python: **/**.py] [jinja2: **/**.html] extensions=jinja2.ext.autoescape,jinja2.ext.with_ [javascript: **/**.js] encoding = utf-8 And its initialization is (imports omitted for simplicity

I'm developing a Flask application using Babel. Thanks to Distutils/Setuptools Integration , all the parameters of compile/extract/... functions are stored in setup.cfg and compiling the i18n files is as easy as ./setup.py compile_catalog Great. Now I would like this to be done automatically when running ./setup.py install In make 's words, that would be letting install target depend on compile_catalog target. The context We store only translation ( .po ) files in the code repository. .gitignore excludes .mo and .pot files from being tracked. When a developer pulls a new revision of the code,

"babel-cli": "^6.26.0", "babel-core": "^6.26.3", "babel-preset-es2015": "^6.24.1", "gulp-babel": "6", 如上代码所示，安装以上版本的babel插件，bable更新很快，当版本不一致会冲突，导致出现 Plugin/Preset files are not allowed to export objects, only functions 。 gulp压缩js代码如下 const uglify = require('gulp-uglify'); //js压缩 const babel = require("gulp-babel"); // gulp打包manager\page\dist\js gulp.task('revJs', ()=> { return gulp.src([filePath + '/page/dist/js/*.js']) .pipe(babel({//编译ES6 presets: ['es2015'] })) .pipe(uglify())//压缩js .pipe(gulp.dest( 'dist/manager/page/dist/js')) }) 来源： https://www.cnblogs.com/uimeigui/p/11797452.html

作为当下最流行的 JavaScript 编译器，Babel 替我们转译 ECMAScript 语法，而我们不用再担心如何进行向后兼容。 零、前言 虽然在 JavaScript 中对象无处不在，但这门语言并不使用经典的基于类的继承方式，而是依赖原型，至少在 ES6 之前是这样的。当时，假设我们要定义一个可以设置 id 与坐标的类，我们会这样写： // Shape 类function Shape(id, x, y) { this.id = id; this.setLocation(x, y);} // 设置坐标的原型方法Shape.prototype.setLocation = function(x, y) { this.x = x; this.y = y;}; 上面是类定义，下面是用于设置坐标的原型方法。从 ECMAScript 2015 开始，语法糖 class 被引入，开发者可以通过 class 关键字来定义类。我们可以直接定义类、在类中写静态方法或继承类等。上例便可改写为： class Shape { constructor(id, x, y) { // 构造函数语法糖 this.id = id; this.setLocation(x, y); } setLocation(x, y) { // 原型方法 this.x = x; this.y = y; }} 一个更符合“传统语言

I have an application that is a node backend and a react frontend. I get the following error when i try to build/run my node application. Node: v10.13.0 Error: dist/index.js:314 regeneratorRuntime.mark(function _callee(productId) { ^ ReferenceError: regeneratorRuntime is not defined .babelrc { "presets": [ [ "@babel/preset-env", { "targets": { "node": "current" }, } ], "@babel/preset-react"], "plugins": [ "@babel/plugin-proposal-class-properties" ] } webpack.config.js { mode: "development", entry: "./src/index.js", target: "node", externals: [nodeExternals()], // in order to ignore all modules