Enable es6 polyfills

I have such webpack config for babel-loader:

// ...
module: {
    loaders: [{
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loaders: ['react-hot', 'babel?stage=0&optional=runtime&externalHelpers']
    }
}

However running such code let copy = someArray.copyWithin(0); returns Uncaught TypeError: someArray.copyWithin is not a function, any ideas (it works in repl)?

Some other methods like Object.assign work fine…

[bengsfort]

Just a heads up to those finding this from Google that haven’t looked at the site lately (like me), the polyfill is no longer available in babel-core/polyfill unless I just really screwed up big time somewhere somehow, but it’s now a separate module altogether.

npm install --save-dev babel-polyfill

Then you can set it as an entry in your webpack config:

...
entry: [
  'babel-polyfill',
  './app/index'
],
...

or import it:

import 'babel-polyfill';

Docs: https://babeljs.io/docs/usage/polyfill/

[joshwiens]

Resolving this as a resolution to the initial question exists in the issue