Polyfills plugin should feature detect polyfills support (using webcomponents loader) about greenwood HOT 3 CLOSED

Maybe it would be better to turn this into an RFC, more thoughts come to mind

• Differential loading
• Babel / PostCSS preset-env
• Browserslist

from greenwood.

Looks like our Lighthouse Performance score could improve as part of this if there's a better way to handle loading of polyfills

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There are about three items that are left, not really related to what true differential loading is though which is basically generating two bundles, but with preset-env we're mainly leaning towards an intelligently generated common bundle.

1. Allow opt-in flag specifically for IE11 (es5 adapter?)
2. Support custom .browserslistrc (nice to have - new ticket?)
3. Use webcomponent-loader or everything? (but actually is bigger bundle size wise than just using bundle?)

The bulk of the heavy lifting coming from polyfills though instead of the straight bundle, we should switch to using the loader, so that it can feature detect the right polyfills to load without the cost of the whole bundle.

The rest of the open items could probably be made their own (single) issue.

from greenwood.