@babel/polyfill使用的坑还是比较多的:最需要理解的是,babel只会转换E6语法,而不会转换新的api,让新的api生效的方法是使用传统的polyfill,为此需要引入这个模块 安装的时. 可以看到,在项目中,babel-runtime真的帮我们进行了polyfill,那为啥还会报上面的Promise未定义的错误呢??? Promise未定义错误真凶. babel-polyfill / core-js. Another is svelte. Make a polyfill for @babel/register and call it before running tests. All gists Back to GitHub. Join the community of millions of developers who build compelling user interfaces with Angular. Ok, if you are looking to setup a project by scratch and want to use all the cool functions from babel and the es6 syntax by default your code will not be able to understand that syntax, so first we should use babel, babel acts like a "translator". The npm package @babel/runtime, which is depended on by most Meteor apps, introduced. It was when I was writing Introducing HTML5 back in 2009. However several ES2015 classes (like Symbol ) are used so it's advisable to include a polyfill like core-js to make sure the code works fine in any browser. npm trends. Browse Source Bump @babel/polyfill from 7. js, Babel automatically includes babel-polyfill (which polyfills what’s missing from the ES6 standard library) and switches on support for source maps. If you're building an app, you can use babel-polyfill. includes() or array. Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. The runtime is packed in the babel-polyfill we have already installed. 6KB minified & gzipped! No dependencies. And it will pollute the global scope. HTML5 Please helps you out with recommendations for polyfills and implementation so you can decide if and how to put each of these features to use. ES2015+で実装するためにBabelのpolyfillを利用する場面は多いと思いますが、Babel6. normalize_options. Subclassable Built-ins. babel-polyfill / core-js. 3"},"versions":{"6. You can include babel-polyfill or core-js to add the required polyfills to your build combined with babel-preset-env to only include the polyfills required for your. js 를 주요 dependency 로 가지고 있으며, 안정적인 Polyfill 들을 사용하기 편리하게 랩핑해 놓은 모듈로 실제 사용하지 않는 Polyfill 도 몽땅 추가되므로 번들링 되는. Add a new option in preset-env: will continue to compile if the native support is slower. A compiler like Babel will almost certainly be a foundational tool in building JavaScript applications going forward. Babel lets us write code that uses new ES6 features, and then transpile s that code into standard ES5 code that can run in older JavaScript environments. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I follow this steps: 1) npm install --save babel-polyfill. また、babel-preset-env と同様に useBuiltIns を true に指定すると、targets の環境で対応していない機能についてのみPolyfillをインポートしてくれるらしいです。. Given this can be problematic for library authors, there's @babel/plugin-transform-runtime option. Where does this babel-loader come from you ask? Well, we need to install it and later set a few configurations. But we can do better! Every loader can be passed options. We just need to include it in our source code. Babel 是一个工具链,主要用于在旧的浏览器或环境中将 ECMAScript 2015+ 代码转换为向后兼容版本的 JavaScript 代码: 转换语法; Polyfill 实现目标环境中缺少的功能 (通过 @babel/polyfill) 源代码转换 (codemods) 更多!(查看视频). MIT · Repository · Original npm · Tarball · package. The padding is applied from the start (left) of the current string. Take note that the build module for JDTable does not include a polyfill. # babel-polyfill 디펜던시 추가 $ npm install --save babel-polyfill 그런 뒤에 스크립트 중 최상위 시작지점에 require 혹은 import 해주면, babel-polyfill 은 전역에 직접 폴리필을 추가한다. The compiler for next generation JavaScript. I use Webpack + Babel for JS files and here is. Fork fiddle. io is a service that will serve polyfills based on the User Agent header so only browsers that require polyfills will get them. npm install --save-dev babel-jest babel-polyfill. 2 broke on Firefox 17. Up until the 0. A fundamental part of Babel is understanding the difference between compiling your code and polyfilling it. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. This package has been deprecated in favor of separate inclusion of required parts of core-js and regenerator-runtime. assign and. io open issues Ask a question (View All Issues) almost 3 years Guide for using Babel with Webpack implies a few setup steps almost 3 years Mention that Object Rest sometimes also need transform-es2015-parameters. normalizePluginNames (plugins) description and source-code function normalizePluginNames(plugins) { return plugins. Documentation and Examples Using with Node. js or its dependencies. io service that provides a script with polyfills, depending on the features and user's browser. babel-polyfill 在项目代码前插入所有的 polyfill 代码,为你的程序打造一个完美的 es2015 运行环境。 babel 建议在网页应用程序里使用 babel-polyfill,只要不在意它略有点大的体积(min 后 86kb),直接用它肯定是最稳妥的。. 3"},"versions":{"6. See our website @babel/polyfill for more information or the issues associated with this package. Sign in Sign up babel-polyfill. We just need to include it in our source code. Compare npm package download statistics over time: babel polyfill vs core js. This will emulate a full ES2015+ environment and is intended to be used in an application rather than a library/tool. proudly hosted with. npm trends. js and import it into your root index. js like so:. function babel-preset-env. If you're having trouble upgrading to Babel 6, start with Six Things You Need To Know About Babel 6. This package has been deprecated in favor of separate inclusion of required parts of core-js and regenerator-runtime. pad Start () The padStart () method pads the current string with another string (repeated, if needed) so that the resulting string reaches the given length. I follow this steps: 1) npm install --save babel-polyfill. A free, fast, and reliable Open Source CDN for npm and GitHub with the largest network and best performance, perfectly suited for production use. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. There is a polyfill project called Polyfill. com/facebook/regenerator and github. A fundamental part of Babel is understanding the difference between compiling your code and polyfilling it. js like so:. npm install babel-polyfill -S // 在 main. Fetch polyfill in React not completely working in IE 11. Enter preset-env. Babel은 최신 ES(2015/NEXT) 표준에 맞춰 작성된 코드를 아직 표준 기능을 구현하지 않은 브라우저와 플랫폼에서도 코드가 작동할 수 있도록 만들어주는 코드 transpiler와 polyfill 도구의 집합입니다. One of the main changes in it was performance optimisations. Documentation and Examples Using with Node. npm install react-app-polyfill core-js or yarn add react-app-polyfill core-js Create a file called (something like) polyfills. Check out some demos! is an element for a popup box in a web page, including a modal option which will make the rest of the page inert during use. Babel's GitHub is by far the most reliable source of. Name of a function to call after the polyfills are loaded. Using babel cli is not the standard way of using babel in a project but i think it gives more intuition about whats happening. How to setup babel for node. 1 the tools use babel to compile new modern JS code into old ES5 to support wide range of browsers. Most of the case this issue resolves when they remove duplicate poly fill. from和Object. I follow this steps: 1) npm install --save babel-polyfill. ES2015+で実装するためにBabelのpolyfillを利用する場面は多いと思いますが、Babel6. com OriginProtocol origin #opensource. Basically Babel polyfill is just github. The polyfill is provided as a convenience but you should use it with @babel/preset-env and the useBuiltIns option so that it doesn't include the whole polyfill which isn't always needed. # babel-polyfill 디펜던시 추가 $ npm install --save babel-polyfill 그런 뒤에 스크립트 중 최상위 시작지점에 require 혹은 import 해주면, babel-polyfill 은 전역에 직접 폴리필을 추가한다. Here are the main things Babel can do for you: Transform syntax; Polyfill features that are missing in your target environment (through @babel. io service that provides a script with polyfills, depending on the features and user's browser. 3"},"versions":{"6. It appeared to be very easy. I use `babel-polyfill` which can be installed on your machine by using NPM from your Please view the README file on the Github repo for full documentation of the. GitHub Gist: instantly share code, notes, and snippets. If you are using babel-preset-es2015, just replace it with babel-preset-env and you will get the latest Babel plugins support. GitHub GitLab Bitbucket npm install [email protected] babel-polyfill. I follow this steps: 1) npm install --save babel-polyfill. However I now wish to add url and url-search-params but cannot work out what magic string to use in the babel config. The compiler for next generation JavaScript. Sign in Sign up babel-polyfill. I'm following the IE11 instructions per the Quick Start documentation. npm install babel-polyfill -S // 在 main. 而 babel-polyfill 处理第二种情况 - 让目标浏览器支持所有特性,不管它是全局的,还是原型的,或是其它。这样,通过 babel-polyfill,不同浏览器在特性支持上就站到同一起跑线。 下面我们看看 babel-polyfill 的用法。 安装 babel-polyfill $ npm install--save @babel/polyfill. Including action, multiplayer, shooting, Racing, sport, io games and more. Here are the main things Babel can do for you: Transform syntax; Polyfill features that are missing in your target environment (through @babel. This option is enabled by default, but you need to manually import the @babel/polyfill package. 0から非推奨になったと書かれている。. Learn more about Babel with our getting started guide or check out some videos on the people and concepts behind it. babel-polyfill. If you're running your tests in the browser bundled with webpack (or similar) then DOM Testing Library should work out of the box for you. dialog-polyfill. この記事ではwebpack4でBabel7. polyfill이 없는 경우를 예제를 통해 살펴봅니다. npm install babel-polyfill--save-dev Use the babel-polyfill in your source code To include the polyfill you need to require it at the top of the entry point to your application. io to dynamically serve browser specific. 默认情况下,它会把 useBuiltIns: 'usage' 传递给 @babel/preset-env,这样它会根据源代码中出现的语言特性自动检测需要的 polyfill。这确保了最终包里 polyfill 数量的最小化。然而,这也意味着如果其中一个依赖需要特殊的 polyfill,默认情况下 Babel 无法将其检测出来。. A script that updates/adds new functions is called “polyfill”. So updating makes big sense. FAQ # General # Can it be used in a production environment? Umi is the underlying front-end framework of Ant Financial, which has directly or indirectly served 600+ applications, including java, node, H5 wireless, Hybrid applications, pure front-end assets applications, CMS applications, and more. `import "babel-polyfill"` is the whole thing which is unrelated to using babel/preset-env, the option transforms into individual ones 1 reply 0 retweets 1 like Reply. How to setup babel for node. Babel includes a polyfill that includes a custom regenerator runtime and core-js. Adding Babel CLI and polyfill. js looks currently:. js 中来做这个操作,所以我将这个操作移到了 request. Here are the main things Babel can do for you: Transform syntax; Polyfill features that are missing in your target environment (through @babel. Please go to https: github. In particular, the lifecycle callback methods that get called if implemented on the element prototype: createdCallback() is called when a custom element is created. 本文主要内容包括:什么是babel-polyfill,如何使用,如何通过按需加载进行性能优化。 本文所有例子可以在 笔者的github 找到。 什么是babel-polyfill. We just need to include it in our source code. js was the next biggest culprit for the file bloat, but removing it wasn't as easy since I needed a way to manipulate and animate SVG in JS still. 0 Bumps [@babel/polyfill](https://github. A script that updates/adds new functions is called "polyfill". proudly hosted with. The compiler for next generation JavaScript. The preferred way to install this extension is through composer. A free, fast, and reliable Open Source CDN for npm and GitHub with the largest network and best performance, perfectly suited for production use. All gists Back to GitHub. Open a command prompt, and navigate (cd) to the es6-tutorial-data directory. npm install --save-dev babel-jest babel-polyfill. To run a GoodData. es6 file would look like this:. Install the Babel command line tool (babel-cli) and a Babel preset. # Babel Preset. babel-polyfill / core-js. For more information, see the compatibility table and the instructions here. These companies may or may not be using Babel on their main web properties, but they're definitely using it somewhere in their organizations :). Logos are added by company representatives. TypeScript has never been easier thanks to the TypeScript plugin for Babel. Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in old browsers or environments. How to setup babel for node. And you need to use import 'babel-polyfill'; to make it work. Those are all the dependencies we need for Babel. Figure 1: Program setup of Citation. 当 useBuiltIns 设置为 usage 时,Babel 会在你使用到 ES2015+ 新特性时,自动添加 babel-polyfill 的引用,并且是 partial 级别的引用。 请注意: usage 的行为类似 babel-transform-runtime,不会造成全局污染,因此也会不会对类似 Array. Don't forget to add a. babel-polyfill Babel is a JavaScript compiler Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in old browsers or environments. IE 11), consider including a global polyfill in your bundled application, such as core-js or babel-polyfill. Feature Performance table for ES6+ (used in babel-preset-env under new option e. Is there a list of all valid babel polyfills somewhere? This is how our babel. 🌋 Pluggable enterprise-level react application framework. For babel-loader, there's one really cool option. GitHub - nstungcom/gulp-starter-kit: Gulp Starter Kit for front-end developer which supports: SCSS, Nunjucks, Babel + auto polyfill, Browserify & Browsersync. Does it transpile/poly-fill code from node_modules too? I had issue with one dependency from node_modules under IE11, and to resolve it I copied it to asset/vendor folder ad now it works. Therefore, while still inside your project directory, run the following two commands: $ yarn add @babel/core @babel/cli --dev$ yarn add @babel/polyfill. We just need to include it in our source code. tui-chart-all. Starting from version 3. It is simply a way of triggering your own code when the polyfills have loaded, intended to allow the polyfill service to be more easily loaded asynchronously with async and defer attributes. Now, out of the box Babel doesn't do anything. babel-polyfill / core-js. Browse Source Bump @babel/polyfill from 7. Take note that the build module for JDTable does not include a polyfill. 更新:随着 babel-preset-es2015 的废弃及 babel-preset-env 的到来,现在有更好的方法来做 polyfill ,详见我的另一篇文章《再见,babel-preset-2015》。 最近在知乎上看到一个问题:Babel 编译出来还是 ES 6?难…. ES2015 and beyond. It can be enabled as a Babel plugin, and it avoids the problem of globals by rewriting the code in such way that they aren't be needed. However I now wish to add url and url-search-params but cannot work out what magic string to use in the babel config. Basic setup for a library. The state shows the increasing popularity of React. This will emulate a full ES2015+ environment and is intended to be used in an application rather than a library/tool. This polyfill is automatically loaded when using babel-node. from和Object. By clicking “Sign up for GitHub”,. Q&A for Work. See who's using Babel. The runtime is packed in the babel-polyfill we have already installed. If you don't use a package manager or a module loader, then you can get the library from the dist folder on github here. Babel lets us write code that uses new ES6 features, and then transpile s that code into standard ES5 code that can run in older JavaScript environments. As per this issue babel/babel#3825, babel-polyfill is most useful for applications, so that it can have as close as possible to a real ES6 environment, since a limitation of babel-runtime is that it does not work with certain parts of ES6, such as certain instance methods. If you're building an app, you can use babel-polyfill. Babel includes a polyfill that includes a custom regenerator runtime and core. README Installation. io is a service that will serve polyfills based on the User Agent header so only browsers that require polyfills will get them. The tests use a data set of size 500 and other data sets will have varying performance but it appears that these features are ready for general use if you have many reads and few writes or need to have objects as keys. Babel's GitHub is by far the most reliable source of. setPrototypeOf" polyfill for IE9. Browserify is elegant and fast. See our website @babel/polyfill for more information. Instead of just tackling them one at a time, is it possible for me to work babel polyfill into my build below and future proof it? I've read several related questions but still am not clear on how I'd fit babel-polyfill into the gulp build below:. If you are using babel-preset-es2015, just replace it with babel-preset-env and you will get the latest Babel plugins support. Then include it in your build. webpack + babel + typescript + es6 - total solutions! -. We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. Tailor the. 更新:随着 babel-preset-es2015 的废弃及 babel-preset-env 的到来,现在有更好的方法来做 polyfill ,详见我的另一篇文章《再见,babel-preset-2015》。 最近在知乎上看到一个问题:Babel 编译出来还是 ES 6?难…. polyfill이 없는 경우를 예제를 통해 살펴봅니다. With this release, the polyfill has been removed, and you will need to supply it yourself if your environment needs it. MIT · Repository · Original npm · Tarball · package. A tiny polyfill for HTML5 multi-handle sliders. Provides polyfills necessary for a full ES2015+ environment. js or its dependencies. includes() or array. This polyfill is automatically loaded when using babel-node. `import "babel-polyfill"` is the whole thing which is unrelated to using babel/preset-env, the option transforms into individual ones 1 reply 0 retweets 1 like Reply. This will emulate a full ES6 environment. Today we're excited to announce something special for Babel users. Start Using Babel 7 Beta Today! Update babel config to match. I use react-table which does not work in a Internet Explorer 11 and I need to install babel-polyfill into my project(web pack); This is issue in github I follow this steps: 1) npm install --save. Patent Notices. Follow that twitter thread and github issues linked for a "fun" time of your own 😅 Conclusion. If you look at the documentation for babel-loader and scroll down, eventually, you'll see those options. Limited support requires the Babel polyfill. 0 release ES6 Promise was being polyfilled using es6-promise. This package has been deprecated in favor of separate inclusion of required parts of core-js and regenerator-runtime. Check out some demos! is an element for a popup box in a web page, including a modal option which will make the rest of the page inert during use. babelrc files are ignored by default. Its main job is to polyfill code. To install it you can use pip. When using either polyfill/shim, you should include it as early as possible in your application's entrypoint (at the very minimum, before you import Draft). Subclassable Built-ins. We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. In Firefox 18 - 39, the name of this method was contains(). 0から非推奨になったと書かれている。. This post is made to answer questions or frustrations that people can have while bootstrapping an app with ES6 in node. Internet Explorer and mandatory polyfill. Compilers/polyfills Desktop browsers Servers/runtimes Mobile; Feature name Current browser ES6 Trans-piler Traceur Babel 6 + core-js 2 Babel 7 + core-js 2. 0, this package has been deprecated. Sign up 🐠 Babel is a compiler for writing next generation JavaScript. If you need support for legacy browsers like IE 11 you will need to inject a polyfill service. However, most people using DOM Testing Library are using it with the Jest testing framework with the testEnvironment set to jest-environment-jsdom (which is the default configuration with Jest). 可以看到,在项目中,babel-runtime真的帮我们进行了polyfill,那为啥还会报上面的Promise未定义的错误呢??? Promise未定义错误真凶. The polyfill is provided as a convenience but you should use it with @babel/preset-env and the useBuiltIns option so that it doesn't include the whole polyfill which isn't always needed. Name of a function to call after the polyfills are loaded. Angular is a platform for building mobile and desktop web applications. The state shows the increasing popularity of React. Fetch polyfill in React not completely working in IE 11. Over a year ago, we set out to find what the biggest difficulties users were running into with TypeScript, and we found that a common theme among Babel users was that trying to get TypeScript set up was just too hard. I'm following the IE11 instructions per the Quick Start documentation. Take caution with these numbers. It was renamed to includes() in bug 1102219 due to the following reason:. If using deprecated @babel/polyfill: npm install @babel/polyfill intersection-observer. Setting up Babel. Execute command to install the package. __group__,ticket,summary,owner,component,_version,priority,severity,votes,milestone,type,_status,workflow,_created,modified,_description,_reporter Very Popular,12706. This will emulate a full ES2015+ environment and is intended to be used in an application rather than a library/tool. The Kindle for iPad/iPhone application and/or methods used in association with the Kindle service may be covered by one or more patents or pending patent applications owned or controlled by Amazon. HTML5 Please helps you out with recommendations for polyfills and implementation so you can decide if and how to put each of these features to use. We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. We're a small group of volunteers that spend their free time maintaining this project, funded by the community. npm trends. pad Start () The padStart () method pads the current string with another string (repeated, if needed) so that the resulting string reaches the given length. babelrc file in your project's root folder. Babel is an awesome entry in the Web Developer toolset. but I'm using babel-polyfill not just the promise Here is the official github fetch. By default, Babel ships with a set of ES2015 syntax transformers. 즉, 전역 오염이 발생한다. webpack + babel + typescript + es6 - total solutions! -. Babel-cli is actually giving a command line interface to the babel-core package that does most of the work. Then import the basic react-app polyfills, plus any specific required features, like so:. js 中来做这个操作,所以我将这个操作移到了 request. This video will explain how Polyfill comes into play with a simple example. It also implements polyfills for some HTML features like the element. However several ES2015 classes (like Symbol ) are used so it's advisable to include a polyfill like core-js to make sure the code works fine in any browser. js and import it into your root index. Feature Performance table for ES6+ (used in babel-preset-env under new option e. Another is svelte. Under use, add an options object with cacheDirectory set to true:. We use cookies for various purposes including analytics. As per this issue babel/babel#3825, babel-polyfill is most useful for applications, so that it can have as close as possible to a real ES6 environment, since a limitation of babel-runtime is that it does not work with certain parts of ES6, such as certain instance methods. The babel-preset-env package uses browserslist to transpile only what is not supported in your browsers matrix. npm install --save babel-polyfill #yarn add babel-polyfill 設定 開啟. If you find something that is not documented on this page then you're at risk of it changing without notice. js like so:. // Assignment: var cubes, list, math, num, number, opposite, race, square; number = 42; opposite = true; if (opposite) { // Conditions: number = -42; } // Functions. Parcel supports zero configuration code splitting out of the box. 3 best open source github follow projects. All gists Back to GitHub. Babel polyfill: We offer you the best online games chosen by the editors of FreeGamesAZ. Does it transpile/poly-fill code from node_modules too? I had issue with one dependency from node_modules under IE11, and to resolve it I copied it to asset/vendor folder ad now it works. io makes it simpler to support differing browsers by attempting to recreate the missing features with polyfills: You can make use of the latest and greatest. If you look at the documentation for babel-loader and scroll down, eventually, you'll see those options. JD-Table is written with ES5/6 functionality. By default, Babel ships with a set of ES2015 syntax transformers. If you need support for legacy browsers like IE 11 you will need to inject a polyfill service. Everything within the dotted square is part of Citation. 而 babel-polyfill 处理第二种情况 - 让目标浏览器支持所有特性,不管它是全局的,还是原型的,或是其它。这样,通过 babel-polyfill,不同浏览器在特性支持上就站到同一起跑线。 下面我们看看 babel-polyfill 的用法。 安装 babel-polyfill $ npm install--save @babel/polyfill. If you are using Babel, you can use the Babel polyfill in your index to specifically include only the needed polyfill code. For babel-loader, there's one really cool option. It can be enabled as a Babel plugin, and it avoids the problem of globals by rewriting the code in such way that they aren't be needed. protot ype. These mostly line up with what's on the github page but are not listed directly. yarn add react react-dom react-relay Set up Relay with a single config file. #opensource. I use Webpack + Babel for JS files and here is. Most of the case this issue resolves when they remove duplicate poly fill. 4, 2018-08-16. The Kindle for iPad/iPhone application and/or methods used in association with the Kindle service may be covered by one or more patents or pending patent applications owned or controlled by Amazon. js 首行引入即可 import "babel-polyfill" 因为我的项目中是有对 axios 进行封装的,而且我也不喜欢在 main. This option is enabled by default, but you need to manually import the @babel/polyfill package. When using Vue CLI to build a library or Web Components, it is recommended to pass useBuiltIns: false to @vue/babel-preset-app to disable automatic polyfill injection. Basic setup for a library. この記事ではwebpack4でBabel7. in order to use babel-polyfill withj your applciation, you can use one of following three methods. This post is made to answer questions or frustrations that people can have while bootstrapping an app with ES6 in node. Compare npm package download statistics over time: babel polyfill vs core js. GitHub Repo. 默认情况下,它会把 useBuiltIns: 'usage' 传递给 @babel/preset-env,这样它会根据源代码中出现的语言特性自动检测需要的 polyfill。这确保了最终包里 polyfill 数量的最小化。然而,这也意味着如果其中一个依赖需要特殊的 polyfill,默认情况下 Babel 无法将其检测出来。. This polyfill is automatically loaded when using babel-node. Take note that the build module for JDTable does not include a polyfill. I'm following the IE11 instructions per the Quick Start documentation. Up until the 0. This option is enabled by default, but you need to manually import the @babel/polyfill package. Babel includes a polyfill that includes a custom regenerator runtime and core. This guide is part of The Complete Guide to ES6 with Babel 6 series. nyc-lib is a set of common libraries used to develop NYC mapping applications. GitHub Repo. This post is made to answer questions or frustrations that people can have while bootstrapping an app with ES6 in node. Passing babel-loader Options. But we can do better! Every loader can be passed options. polyfill 用起来很方便,但是你应该和 @babel/preset-env 以及 useBuiltIns option 一起用。这样在使用的时候就不会包含那些我们一般不会用到的polyfill 了。 这样在使用的时候就不会包含那些我们一般不会用到的polyfill 了。. If you're having trouble upgrading to Babel 6, start with Six Things You Need To Know About Babel 6. Open a command prompt, and navigate (cd) to the es6-tutorial-data directory. According to migration guide from babel, you could use babel-upgrade tool to resolve the issue of stage preset deprecation. setPrototypeOf" polyfill for IE9.