After reading the article Removing Babel's Stage Presets by babel, I still not fully understand how to add a proposal from, for example, stage-3 (flatMap) to .babelrc.  As far as I understand, because flatMap can be written in ES5, then I need a...

I am using ChildNode.remove() and I described by Mozilla I need a polyfill for IE. I am using webpack with the babel-polyfill configured:   "babel-polyfill": "^6.13.0",  "webpack": "^2.4.1",   webpack.config.babel.js:...

I am unable to find a defined set of features that Babel compiler cannot compile. I know that there is babel-polyfill and core.js but I need to know the exact names of es2015 features which babel compiler cannot compile.  Any help would be appreciate...

I'm using babel-polyfill and I'm trying to iterate an HTMLCollection object using for-of loop:  const elements = document.getElementsByClassName('some-class') for (const element of elements) {   console.log(element) }   It's not w...

I am getting the following error  Uncaught Error: only one instance of babel-polyfill is allowed     at Object.eval (index.js?db4d:10)     at eval (index.js:29)     at Object../node_modules/babel-polyfill/lib/index.js (vendors.js?3b19ee46035be2acbd36...

I am currently trying to get my es2017 code to work in IE11 and unfortunately I need to transpile the code on the client side due to the nature of my project.  I was looking at some other SO posts (How to install babel and using ES6 locally on Browse...

I understand the difference between babel-runtime and babel-polyfill that the first one doesn't populate global scope while latter does. I think babel-runtime is safer hovewer I can't understand what this means and how does it effects me:...

I am getting a 'only one instance of babel-polyfill is allowed' Error when running a webpack compiled javascript file using the webpack config below.    const config = {   entry: {     file1: ['babel-polyfill','/path1/file1.js'...

When using Rollup how can you get it to work with both @babel/preset-env and @babel/polyfill? The docs mentioned to add useBuiltIns: 'usage' but when I do this I get a require is not defined error in console. Below is what I have so far; is t...

After upgrading my project to Babel 7, running tests through jest is throwing the following error. The tests used to run without any issues in Babel 6, but are failing in Babel 7 with the following error  TypeError: wks is not a function    at Object...