Babel Polyfill will emulate a full ES6 environment. This polyfill is automatically loaded when using babel-node.
Installation:
$ npm install babel-polyfill
To find more information :
Questions tagged [babel-polyfill]
265 questions
9
votes
1 answer
Can Webpack tree-shaking remove unused babel-polyfills?
I try to make webpack tree-shaking remove unused babel-polyfill.
index.js file contains:
import 'babel-polyfill'
const add4 = n => n + 4
const add5 = n => n + 5
add4(6)
console.log('boom', add4(4))
In this file no code require any es2015+…
François Romain
- 13,617
- 17
- 89
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8
votes
2 answers
How to add flatMap using babel 7?
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…
Stav Alfi
- 13,139
- 23
- 99
- 171
8
votes
1 answer
what features does the babel polyfill support?
Is there any type of list of what features the babel-polyfill supports? We just started using babel and i'm wondering if some of the dependencies we currently rely on can be eliminated like es6-promises & whatwg-fetch. If babel-polyfill supported…
coding4fun
- 8,038
- 13
- 58
- 85
7
votes
1 answer
fetch and Headers are undefined in IE11.0.9600 with babel-polyfill when process.env.NODE_ENV=='production'
When process.env.NODE_ENV=='development' - it is OK!
But our production build failed in IE 11 (11.0.9600).
All work fine in chrome 55.
devDependencies:
...
babel-core: "6.22.0",
babel-eslint: "^7.0.0",
babel-loader: "^6.2.5",
babel-preset-env:…
Nachkebiia Lasha
- 183
- 2
- 10
7
votes
0 answers
Dynamically load babel polyfill only when needed?
I was watching an Advanced Webpack video. Right at about the 10 minute mark he talks about detecting whether you need the Babel-Polyfill at runtime and then loading it if you need it. I found this very interesting. I conversed with him but twitter…
coding4fun
- 8,038
- 13
- 58
- 85
6
votes
1 answer
Can Babel include regeneratorRuntime Dependency within the Generated Code?
Using babel to target Node v4, it seems the generated code depends on a regeneratorRuntime module which is not included in the output.
From what I understand it seems that one must require the 'regenerator-runtime/runtime' module at runtime before…
lostsource
- 21,070
- 8
- 66
- 88
6
votes
0 answers
@babel/runtime: SyntaxError: Unexpected token export @babel/runtime/helpers/esm/extends
two different checkouts of same code resulting in two different versions of @babel/runtime for the same version of babel
one version of @babel/runtime is "7.6.3" which contains commonJS module exports
but another version of it is "7.9.2" which…
Ashutosh Verma
- 309
- 1
- 2
- 11
6
votes
0 answers
How to polyfill IE11 in NextJS project?
I'm trying to polyfill the project for IE11 but no matter what I do browser logs these errors:
Dev mode:
SCRIPT1002: Syntax error in _app.js (49004,30)
49004 const Component = props =>…
NooNoo
- 83
- 1
- 1
- 4
6
votes
1 answer
React Boilerplate : Uncaught RangeError: Maximum call stack size exceeded
I am getting the error of Uncaught RangeError: Maximum call stack size exceeded because of the following reason :
npm.babel.e5824bbfde6f57781e4f.chunk.js:1 @babel/polyfill is loaded more than once on this page. This is probably not…
Dhaval Soni
- 205
- 2
- 14
6
votes
1 answer
webpack & babel-polyfill: Can't resolve 'core-js/modules/es6.array.map' in source directory
I'm facing this error when I execute webpack:
Module not found: Error: Can't resolve 'core-js/modules/es6.array.map' in '/path/to/project/src'
@ ./src/index.ts 1:0-39
index.ts:
console.log([1, 2, 3].map(x => x * x));
.babelrc:
{
"presets": [
…
legogo
- 887
- 1
- 8
- 11
6
votes
1 answer
How to reduce babel-polyfill size (150 KB minified)?
I just setup new webpack 4 project and in my main js file imported babel-polyfill
import 'babel-polyfill';
And after webpack production build i analized my bandle with source-map-explorer i see such picture
So babel-polyfill (core-js) took 150 Kb…
Vololodymyr
- 1,996
- 5
- 26
- 45
6
votes
0 answers
Do I still need to use babel-preset-env and Babel plugins if I am using babel-polyfill?
My understanding is that the Babel Polyfill emulates a full ES6 environment, whereas babel-preset-env compiles ES6 (and beyond) to ES5 automatically based on the environments (browsers) you need to support.
I have a few questions regarding…
tomhughes
- 4,597
- 2
- 24
- 33
6
votes
2 answers
Webpack implicit vendor/manifest chunks in IE11 - Promise is undefined
Short version
When I run my application in IE11, I get an error saying Promise is undefined from within the manifest.js file.
How do I add babel-polyfill or similar such that it runs before the manifest is executed?
Long version
I am trying to add…
Matt Wilson
- 8,159
- 8
- 33
- 55
5
votes
1 answer
Switching from babel-polyfill to core-js in React app
I use babel-polyfill in my React app to transpile ECMAScript to vanilla JS. I understand babel-polyfill is now deprecated.
The warning I get in my React app is:
@babel/polyfill is deprecated. Please, use required parts of core-js
and…
Sam
- 26,817
- 58
- 206
- 383
5
votes
1 answer
babel/polyfill is deprecated warning in create-react-app
I have a React app that I created using npx create-react-app my-app. I've been regularly updating both React and other npm packages.
A while ago, I started getting the following warning:
@babel/polyfill is deprecated. Please, use required parts of…
Sam
- 26,817
- 58
- 206
- 383