In [51146], the `core-js` package replaced the deprecated `@babel//polyfill` one. The `core-js` package builds `wp-polyfill` from a configuration provided by `@wordpress/babel-preset-default` instead of copying a one size fits all polyfill.
That change caused an issue where plugins and themes relying on the `regenerator-runtime` script being included in the `wp-polyfill.js` file encountering fatal JavaScript errors.
This adds the `regenerator-runtime` package to Core and registers it as a dependency for `wp-polyfill`. While Core does not require `regenerator-runtime`, it will allow for a smoother transition to using `core-js`.
This dependency will be removed in a future version of WordPress, so developers are encouraged to add `regenerator-runtime` as a dependency for any custom script that requires it.
Follow up to [51146].
Props gziolo, herregroen, jeherve, hellofromtonya, peterwilsoncc.
Fixes#52941.
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