| lib | notes |
|---|---|
| babel-cli | basically what you need always |
| babel-register | this is only for dev or local use and not production or browser |
| babel-core | only necessary if using babel programatically |
| babel-polyfill | shims inconsistent browser functions like Array.from, etc. |
| babel-runtime | only helps at a code level by optimizing babel helpers into a single runtime |
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