Problem/Motivation
Right now we don't have a solid plan for how we can handle polyfill support.
Proposed resolution
For now, I see a few options:
1. Include the appropriate polyfills manually:
We can provide one file (e.g misc/polyfills.es6.js) which includes needed polyfills (most probably used from https://github.com/zloirock/core-js).
This file will be loaded as the first one before any other JS files.
The similar approach was done by CRA.
2. Add https://polyfill.io/
What we need is just add one js file before any others:<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
But it seems polyfill.io is a good service with bad polyfills (different authors/projects which doesn't well play together).
3. Configure https://babeljs.io/docs/en/babel-polyfill
It's quite heave. But will include all needed polyfills. Need more investigation.
4. Configure https://babeljs.io/docs/en/babel-plugin-transform-runtime
This solution will add polyfills automatically only when needed (based on target browsers from babel-present-env).
But, that's something which depends on require or import - we don't support it ¯\_(ツ)_/¯
5. Any others?
Remaining tasks
1. discuss with community
2. write solution
3. review
4. 🎉
