Ie11 Es6 Polyfill

See the install for instructions; Internet Explorer and platform polyfills. I got excited when I saw the link, but then noticed the fix was a polyfill for Object. Babel and Webpack for compiling and bundling JavaScript ES6 (ES6/ ES7/ ES8) In this article i am going to explain how to use the Babel compiler for compiling the javascript from ES6 (or higher ES version) to ES5 compliant version. For API details and how to use promises, see the JavaScript Promises HTML5Rocks article. We have to include the babel-preset-es2015 module as well. I believe this part is missing from the article. import "es6-promise/auto"; import "es6-object-assign"; Once these packages were imported and referenced in the appropriate files I removed the polyfill. For API information about Promises, please check out this article HTML5Rocks article. I even tried to "re-polyfill" it after a while and after the final page load. Install polyfill: npm install core-js --save; Activate polyfill: import. ES6 has been around for many years, we are very conservative using it. jQuery's promises have a poorly thought out API that will likely just confuse you. It is current in that it is currently in use, but that is not necessarily the same as. This is a polyfill of the ES6 Promise. Yet IE11's end of extended support is October 14, 2025. ts file is almost empty. This story is about polyfills. To use more recent versions of Vega with older browsers, use a JavaScript compiler such as Babel to generate ES5-compliant code. Template Strings are demarked by a backtick(`) on either end and can contain other backticks if they are escaped by a backslash(ie. Though most polyfills target out-of-date browsers, some exist to simply push modern browsers forward a little bit more. We already had that polyfill at that point via the babel-polyfill package ( removed for now ). As you can imagine this is not an ideal solution and it is impacting all your users with no discrimination. 1 SF 12 SF 12. Below is a list of polyfills that we use that Babel does not handle, which will get your applications working in browsers like Edge and IE11. And so, let us set about making our modern code run in non-modern browsers. To import the entire core set of functionality: import Rx from 'rxjs/Rx'; Rx. Between the description and the example is a little note box that points out that Internet Explorer 11 doesn't implement native promises. Thanks for the quick response. A polyfill for ES6-style Promises, tracking rsvp - a JavaScript package on Bower - Libraries. Some parts of Web Components simply aren’t possible/reasonable to polyfill. It may be possible to insert a. See a sample build configuration for LitElement with Babel and Rollup. This story is about polyfills. Angular is a platform for building mobile and desktop web applications. This element is a solution for a common UI component: a collapsible block. Babel comes with a polyfill for new functionality in the standard library. Polyfill-Library version Use a specific version of the polyfill-library (recommended for production websites). cmulders changed the title Need to polyfill Object. ts systemjs. はじめに kintoneのJavaScriptカスタマイズを開発しているときに、誰しも"IE11で動かない!"ことを体験したことがあると思います。 こういった特定のブラウザでプログラムが動作しない問題を解決するためにBabel, Polyfill, webpackというツールを利用するのがスタンダードな解決策になっています。 本. IE11 is no longer developed by MS, which means it should not be used. Later versions of Vega assume ES6 support. Lightweight ES6 Promise polyfill for the browser and node. babel-preset-env might be the best of both worlds. ts qui ressemble à ceci: // This file includes polyfills needed by Angular 2 and is loaded before // the app. Given your app doesn’t have to share a JavaScript environment with other apps, you’ll be ok to use babel-polyfill to handle this: npm install babel-polyfill --save. Вы должны установить его как зависимость первым. I invested great deal of efforts while developing in this new technologes (react, es6, node). Hello future self. Sadly I lost the source where I read this, mea. You have created your angular app and now you have some error about method fill, for example: "Object doesn't support property or method 'fill'". from() was added to the ECMA-262 standard in the 6 th Edition (ES2015). We just need to include it in our source code. js is a library designed to make writing CSS polyfills much, much easier. Later calls use React’s DOM diffing algorithm for efficient updates. In addition to the polyfill package I read that you should load polyfill as the very first package and than the others. ES6로 코드를 작성하다가 요구사항변경으로 익스10도 호환가능해야 한다고해서 babel로 제 코드를 컴파일을 하려고하는데, Map을 사용하였기 때문에 import 'babel-polyfill';을 제 스크립트에 추가해서 작성하였습니다. 前后端分离的跨域数据请求兼容. Additionally, es5-shim should be loaded before es6-shim. Gulp; is a powerful tool for automating build-related tasks. Would be nice to know if it works. Join now and share your views and answers on Syncfusion Developer Community for the thread: ASP. Specifically, `0 in [,]` and `0 in [undefined]` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. find() and Array. How do you loop over the elements of an array? When JavaScript was introduced, twenty years ago, you would do it like this:. Perhaps it is so far enough into the future that all browsers now support all of ES6 or better natively. ES6 introduced a few new Array methods. ts systemjs. If your application uses constants, arrow functions, or any of the other features introduced by ES6, an IE11 visitor will have issues using your application. js头部,如果是其他的环境就在你入口js文件的顶部. 그래서 IE개발자 도구로 확인해보니 오류가 뜨네요. The following sections explain what that means. html and rebuilt the application. js bundle, which polyfills HTML imports, Custom Elements, Shadow DOM (with polyfills called Shady DOM and Shady CSS) and the template element. The polyfills support IE11, but it's not all sunshine and rainbows. Maybe this is a concern that should be raised over at es6-promise. A script that updates/adds new functions is called “polyfill”. Introduction. Callback Name of the function to call after the polyfills are loaded. Ant Design 3. 1 SF 12 SF 12. In addition to the polyfill package I read that you should load polyfill as the very first package and than the others. keys has the best support. js environment and already has all of npm's 400,000 packages pre-installed, including es6-promise-polyfill with all npm packages installed. "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers. Open a command prompt, and navigate (cd) to the es6-tutorial-data directory. Then, adding these 3 lines worked for me. Try using an arrow function in your code and opening it up in IE 11, and it won't work. It seems that this time, IE doesn't support Array. For instance, using create-react-app and targeting IE11, src/index. This article seems kind of odd. Though most polyfills target out-of-date browsers, some exist to simply push modern browsers forward a little bit more. 안녕하세요 글 보고 질문이 있어서 글 남깁니다. com for project documentation. 1 In CommonJS, imports are copies of exported values # With CommonJS (Node. bower install es6-shim if you’re using Bower. With appropriate polyfills an IE11 user’s experience will be similar to Chrome or Safari. Chrome Firefox Opera Edge Safari iOS Android Microsoft Internet Explorer Refer this documentation to add the polyfills in Blazor server application. Install polyfill: npm install core-js --save; Activate polyfill: import. The ES6 polyfill target die-hard legacy browsers. let my_string = `some cool \`escaped\` thing`). The implementation is a subset of rsvp. Babel and Webpack for compiling and bundling JavaScript ES6 (ES6/ ES7/ ES8) In this article i am going to explain how to use the Babel compiler for compiling the javascript from ES6 (or higher ES version) to ES5 compliant version. \my-app\src\polyfills. The polyfills support IE11, but it's not all sunshine and rainbows. Por ello vamos a tener que depender de un segundo Polyfill para asegurarnos la compatibilidad con las promesas. How to start using ES6 (and beyond) today. es6 file would look like this:. To use more recent versions of Vega with older browsers, use a JavaScript compiler such as Babel to generate ES5-compliant code. To make web components cross-browser compatible down to IE11 you will need the three following polyfills: 1. IE 11 Polyfill package¶. render() controls the contents of the container node you pass in. It does this as a performance optimization. Any existing DOM elements inside are replaced when first called. For API details and how to use promises, see the JavaScript Promises HTML5Rocks article. IE11 is still happy and working great with my React app and now I have polyfills better integrated into my project. ts: import 'web-animations-js'; // Run npm install --save web-animations-js. Before we go any further, I should explain what Transpiling is and how it differs from Polyfills. How do you use ES6 if it doesn't work in old browsers? Is there a polyfill for everything? Or should I serve different JavaScript to different browsers? Edit: does anyone server ES6 to most browsers and then ES5 to IE11? (transpired using babel). ES6 In Depth is a series on new features being added to the JavaScript programming language in the 6th Edition of the ECMAScript standard, ES6 for short. Imagine the following application. Almost every framework, including Bootstrap and jQuery UI, has its own plugin for a similar solution, but none conform to the HTML5 specification — probably because most were around long before `` got specified and, therefore, represent. Raise MW JS requirement to include ES6 Promise (drop IE11, Safari 5-6, and Android 4. Introduction. If you have to use them for some reason, you probably have more pressing concerns than Angular performance. ES6 Promise polyfill This is a polyfill of ES6 Promise. The implementation is a subset of rsvp. ts の次のコード行のコメントを. Folder structure. Looking to get your Angular application off of the SystemJS frame work? In this post, we'll go through the process step-by-step, and put our app on webpack. Using and configuring Babel 6 in web browsers and on Node. Later versions of Vega assume ES6 support. This is a playground to test code. It turns out that webpack also does a fantastic job of packaging standalone ES6 libraries – a fact we will look at closely during this post. When all looked good and I gave my PO a link to the site, great was my disappointment when it didn't work in Internet Exlorer. In this post, we'll break down the differences between the two so you can. Underscore now registers itself for AMD (Require. js extracted by @jakearchibald, if you're wanting extra features and more debugging options, check out the full library. 그래서 IE개발자 도구로 확인해보니 오류가 뜨네요. Given your app doesn’t have to share a JavaScript environment with other apps, you’ll be ok to use babel-polyfill to handle this: npm install babel-polyfill --save. ES6 via npm npm install rxjs. ES6로 코드를 작성하다가 요구사항변경으로 익스10도 호환가능해야 한다고해서 babel로 제 코드를 컴파일을 하려고하는데, Map을 사용하였기 때문에 import 'babel-polyfill';을 제 스크립트에 추가해서 작성하였습니다. When all looked good and I gave my PO a link to the site, great was my disappointment when it didn't work in Internet Exlorer. assign so demos work on IE11 Need to polyfill ES6 so demos work on IE11 Mar 3, 2016 IvanSanchez reopened this Mar 3, 2016 This comment has been minimized. The implementation is a subset of rsvp. I even tried to "re-polyfill" it after a while and after the final page load. Angular is a platform for building mobile and desktop web applications. Luckily, due to the flexible nature of JavaScript, certain functionality can be back-ported to earlier language versions by using polyfills or other techniques. com for project documentation. The Syncfusion Essential JS 2 components are supported in IE 11 browser with ES6 Promise polyfill. ES6 introduced a few new Array methods. Angular is using core-js polyfills to support older browsers. The ECMAScript specification is a standardized specification of a scripting language developed by Brendan Eich of Netscape; initially it was named Mocha, later LiveScript, and finally JavaScript. This fork supports IE8 with es5-shim, es5-sham and es6-promise. Hi , Angular 7 application is not running in IE11 eventhough updated polyfills. clipboard-polyfill. As a developer, your primary interaction point with TDS is through React components. To know when the polyfill has finished all of its start up tasks, listen to the WebComponentsReady event on document or window. Multiline strings in ES6 JavaScript. Maybe this is a concern that should be raised over at es6-promise. We need additional step to include polyfill to make it work in older browsers. There was a distinct lack of enthusiasm to read up and learn CoffeeScript, since the perception is that it’s a dead-end technology. 标签: ES6 | jsweibo jsweibo的博客. To ease the process you can use some compiler like Babel JS or external libraries like polyfill. ts file is almost empty - apart from a plethora of comments. Do not support IE anymore. "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers. So I started to dig the issue to find out if it is Angular Framework, Polyfills or SharePoint Framework causing the issue. but without. Microsoft further advises that there are several polyfills and libraries which will implement promises to IE. Note that es6. Introducing Polyfills. npm install --save-dev babel-preset-es2015. Seems to be an alternative to your way. It makes sense that code doesn’t work in older browsers that were developed prior to the release of ES6, but there are some browsers that have been released after ES6 that don’t support the new JavaScript syntax and functionality yet. I also don’t understand why you wen’t full polyfill down to IE 5 for XHR, underlying how mess is that, and didn’t show how worst would be the full polyfill down to IE 5 for fetch, including the Promises polyfill. User avatar images are not taken from legacy JBoss Developer user profile anymore. For the type attribute of buttons, use ng-attr-type tags instead of type = "{{ someExpression }}". Recently, if you create a brand new project with the Angular CLI and test it in IE11, you see that it is not working (not displaying anything). toString()")のpolyfillsバンドルで発生します。. I made my app run in IE 11 without changing the target: I did everything above except for changing the target in tsConfig. The ES6 polyfill target die-hard legacy browsers. This avoids the problem of having to detect the user browser and pushing a specific bun. With appropriate polyfills an IE11 user’s experience will be similar to Chrome or Safari. See a sample build configuration for LitElement with Babel and Rollup. Hello future self. Seems to be an alternative to your way. Note: This course has been updated / replace with ES6: The Right Parts The next few years in JavaScript will see many changes, both on the client-side as well as on the server. In particular, the new ES6 built-ins like Set, Map and Promise must be polyfilled, and Babel’s generator implementation also uses a number of runtime helpers. import { sp } from "@pnp/sp"; sp. Deciding to support IE11 means added development time, added complexity, added surface area for bugs, and exposing users to a buggy, outdated browser. javascript observe es6 proxy polyfill for ie11 - code examples. Looking to get your Angular application off of the SystemJS frame work? In this post, we'll go through the process step-by-step, and put our app on webpack. 안녕하세요 글 보고 질문이 있어서 글 남깁니다. Before we go too far, let's talk about folder structure. For example, you book a flight ticket to go to India for travelling to the beautiful hill station Darjeeling. I invested great deal of efforts while developing in this new technologes (react, es6, node). Supported polyfills IE lt 10 // Map require('es6-map/implement'); Size: 28KB Providing Map Object. Our goal is to eventually phase out the transpilation step in our build process, but until then, we’ll provide both the ES6 and ES5 versions on npm. So I started to dig the issue to find out if it is Angular Framework, Polyfills or SharePoint Framework causing the issue. You still need polyfills:) Just drop that at the top of your pages, don't worry about importing anything, just write the ES6 like it was natively available – CodingIntrigue Dec 16 '15 at 8:32 1 es6-promise is a slow and pretty outdated polyfill afaik. Frequently Asked Questions What browsers are supported? Next. If you know what browsers you want to support, it can compile code that uses the new feature where possible. A script that updates/adds new functions is called “polyfill”. Having never worked with ES6 before, choosing Preact also introduced me …. We already had that polyfill at that point via the babel-polyfill package ( removed for now ). このアプリのログインシーケンス中にIE 11がクラッシュしました:「解放されたスクリプトからコードを実行できません」。 IEコンソールによると、エラーは10939行目( "var testString = delegate. It is because the required polyfills are not included anymore by default. The polyfills support IE11, but it's not all sunshine and rainbows. Implementations / Polyfills. I still stand by my opinion that unless you have a specific client that you know needs to have IE supported, then it is a bit wasteful to develop for a dwindling market. Once again, this is ES6 in Depth. Vue CLI 3 버전의 코드를 IE11을 지원하도록 설정하기. It makes sense that code doesn’t work in older browsers that were developed prior to the release of ES6, but there are some browsers that have been released after ES6 that don’t support the new JavaScript syntax and functionality yet. How do you loop over the elements of an array? When JavaScript was introduced, twenty years ago, you would do it like this:. Enabling Internet Explorer Support. You can set targets config if you are using umi. Step 2: Set Up Babel and Webpack. If you are using https://polyfill. That ticket is a promise by the airline that you will get a seat on the day of your departure. About External Resources. Imagine the following application. ES6로 코드를 작성하다가 요구사항변경으로 익스10도 호환가능해야 한다고해서 babel로 제 코드를 컴파일을 하려고하는데, Map을 사용하였기 때문에 import 'babel-polyfill';을 제 스크립트에 추가해서 작성하였습니다. Imagine the following application. p Promises are useful both in node. Compatibility mode uses the lowest common denominator—code is transpiled down to ES5 and the required polyfills are added. Notice: this only makes the variable itself immutable, not its assigned content (for instance, in case the content is an object, this means the object itself can still be altered). 这篇文章主要介绍了Vue iview IE浏览器不兼容报错的决绝方法,由于Iview编译使用到了es6的一些新特性,但是在IE中不支持ES6的新特性,本文就介绍一下如何解决这些问题. ts qui ressemble à ceci: // This file includes polyfills needed by Angular 2 and is loaded before // the app. html and rebuilt the application. Chrome Firefox Opera Edge Safari iOS Android Microsoft Internet Explorer Refer this documentation to add the polyfills in Blazor server application. In November 1996, Netscape announced a meeting of the Ecma International standards organization to. So the final github. Hope you enjoyed my code story-telling time 😂 Now go out there and have some fun with all these amazing Object methods 😊 # Browser Support. In this blogpost I want to show you how you can move from an existing Angular application using systemjs to an application with webpack. このアプリのログインシーケンス中にIE 11がクラッシュしました:「解放されたスクリプトからコードを実行できません」。 IEコンソールによると、エラーは10939行目( "var testString = delegate. For API details and how to use promises, see the JavaScript Promises HTML5Rocks article. entries() into old ES5 world) with or without Webpack, make sure your babel configuration is taking into account. but it loads polyfills asnychronously and therefore starts race condition with inline code wildly used in "query" architecture. keys has the best support. The Goal Write In ES6, Use In ES5. render() controls the contents of the container node you pass in. Transpiling adds an extra step to the build process and is sometimes done to avoid needing polyfills. 안녕하세요 글 보고 질문이 있어서 글 남깁니다. I'm wondering if we can make the polyfill optional in the build, and just require it using bower instead of "baking" it into the lib, maybe once it becomes native on IE. That bundle will ensure that your custom elements will work all the way back to Internet Explorer 11. Toggle navigation. Deciding to support IE11 means added development time, added complexity, added surface area for bugs, and exposing users to a buggy, outdated browser. So it might be es6-promise that is messing with Promise. \my-app\src\polyfills. Using and configuring Babel 6 in web browsers and on Node. If you want to use all the ES6 features, no single modern browser implements them all (Webkit is still lacking on modules) and so you will need to use a collection of polyfills. ES6 has been around for many years, we are very conservative using it. The implementation is a subset of rsvp. By using Eufemia properties, like color names and typography properties, instead of defining colors and typography directly as hard coded values, you make your code much more readable and future proof in terms of refactoring and new enhancements. io is a third-party CDN. Install polyfill: npm install core-js --save; Activate polyfill: import. createElement("tagname") for each of the new HTML5 elements, which causes IE to parse them correctly. You can use gravatar or upload image there. Enabling Internet Explorer Support. It seems this component is using Fetch API to retrieve data from the server (in one of the possible implementations to render data in AG Grid). That ticket is a promise by the airline that you will get a seat on the day of your departure. I had a blank page on Internet Explorer 11. Any existing DOM elements inside are replaced when first called. For API information about Promises, please check out this article HTML5Rocks article. Specifically, `0 in [,]` and `0 in [undefined]` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. In this case, a React component wrapped in a Drupal module was not loading in IE. This element is a solution for a common UI component: a collapsible block. but it loads polyfills asnychronously and therefore starts race condition with inline code wildly used in "query" architecture. Notable examples include:. Anyone else experiencing this? If I remove the line: 'Promise': 'es6-promise', Everything works as expected in Safari but I lose support for IE and Opera Mini since I'm not using a Promise polyfill. If the substring is found, it returns the index of the character that starts the string. 部分 Babel 没有处理的对象,自行兼容. Sadly I lost the source where I read this, mea. Setting up ES6. So we love the next generation JavaScript and all the beauty that comes with its features starting from ES6 notably and continued to expand with ES7. By using Eufemia properties, like color names and typography properties, instead of defining colors and typography directly as hard coded values, you make your code much more readable and future proof in terms of refactoring and new enhancements. Anyone know how I can. In this article i am going to explain how to use the Babel compiler for compiling the javascript from ES6(or higher ES version) to ES5 compliant version. I updated my gist with a similiar polyfill. I made my app run in IE 11 without changing the target: I did everything above except for changing the target in tsConfig. Angular is using core-js polyfills to support older browsers. If you are one of the unfortunate people who have to deal with super old browsers such as older versions of Internet Explorer, then you may be stuck on using a smaller subset of ES6 features. As mentioned earlier, Babel does not default to transpiling ES6 right off the bat. Polyfills allow using functionalities from newer ECMA versions in older environments that lack them. js supports IE11 and all modern browsers out of the box using @babel/preset-env. Required Polyfills. fetch JavaScript polyfill supporting IE8. app ├── // modules, components and so on ├── app. Hello future self. The latter works in Chrome, Firefox, Safari and Edge but does not work in Internet Explorer (even 11). 使用 Vue 的全家桶,对于 ie11 是基本不用兼容的,既然你是做官网,兼容性的问题就不能太任性,ie 的兼容至少要做到 ie9,兼容的事情还是有不少工作的,大致有以下几点: es6兼容. How do you loop over the elements of an array? When JavaScript was introduced, twenty years ago, you would do it like this:. I already uncommented your two lines, as I said. I also don’t understand why you wen’t full polyfill down to IE 5 for XHR, underlying how mess is that, and didn’t show how worst would be the full polyfill down to IE 5 for fetch, including the Promises polyfill. Most other browsers support promises natively, IE is the problem child – again. The remaining polyfills. I even tried to "re-polyfill" it after a while and after the final page load. 자사 홈페이지를 nextjs로 제작을 했다. 0 supports both React 15 and 16 but we strongly suggest React 16 for better performance and fewer bugs. Chrome Firefox Opera Edge Safari iOS Android Microsoft Internet Explorer Refer this documentation to add the polyfills in Blazor server application. You can work around this by inserting the following code at the beginning of your scripts, allowing use of Array. js within the SVG-Edit project root. It is because the required polyfills are not included anymore by default. fetch exists. ES6 Shim is a collection of such shims which makes legacy JavaScript engines behave like ES6-enabled engines as close as possible. Usage in IE<9. There was a distinct lack of enthusiasm to read up and learn CoffeeScript, since the perception is that it’s a dead-end technology. ts: import 'web-animations-js'; // Run npm install --save web-animations-js. Most other browsers support promises natively, IE is the problem child - again. Вы импортируете polyfill, который не включен по умолчанию. The suite provides a set of ready-made bundles to choose from. ),打包后的项目一直报错,原因就是ie不支持很多es6的写法,比如箭头函数等。使用babel解决ie兼容也应该是目前大多数都采取的方案。以下为自己总结的解决过 博文 来自: weixin_34353714的博客. If you're wanting extra features and more debugging options, check out the full library. Use web components today and have them work in all major browsers. The ES6 polyfill target die-hard legacy browsers. If you are using https://polyfill. If you have to use them for some reason, you probably have more pressing concerns than Angular performance. Imagine the following application. Specifically, `0 in [,]` and `0 in [undefined]` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. A Polyfill is a piece of code that adds functionality to older (or just less compliant) browsers so that you can use the latest and greatest features from the W3C specification. 0で @babel/polyfill が非推奨となり、その修正とあわせて記事全体を加筆・修正いたしました。(2019/10/2) ES6で開発を行うにあたりwebpackやBabelを使用した環境を、公式サイトやブログを参考にしながら整理しました。. About External Resources. But it fits also better in thinking of the Living system terms. So far I’m very happy with choosing Preact but that’s a story for a different blog post. includes を使用した場合、IE11ではundefinedでエラーになります。 IE11はES5を採用しているため、ES7の Array. The implementation is a subset of rsvp. jQuery's promises have a poorly thought out API that will likely just confuse you. 0 did not require this, but the. io service that provides a script with polyfills, depending on the features and user’s browser. Maintainability is important. OK, I Understand. Use web components today and have them work in all major browsers. The implementation is a subset of rsvp. Imagine the following application. We already had that polyfill at that point via the babel-polyfill package ( removed for now ). A fundamental part of Babel is understanding the difference between compiling your code and polyfilling it. Backwards Compatible with Polyfills. here’s a comparison of the latest Chrome release versus Internet Explorer 9 So the Babel polyfill can give us all the ES6 features. fetch exists. Learn all about these methods below… The Array. This is a follow up to an earlier post about getting JavaScript libraries to work in IE. Is there any way to polyfill Proxy objects for IE11? All other browsers support P. ” No amount of polyfilling, however targeted, will get you arrow functions, const, let, or other syntax in older browsers. ES6로 코드를 작성하다가 요구사항변경으로 익스10도 호환가능해야 한다고해서 babel로 제 코드를 컴파일을 하려고하는데, Map을 사용하였기 때문에 import 'babel-polyfill';을 제 스크립트에 추가해서 작성하였습니다. Por ello vamos a tener que depender de un segundo Polyfill para asegurarnos la compatibilidad con las promesas. To add ES6 Promise polyfill using CDN, include this in your HTML file.