(Starting point - this excellent article)

Quick notes:

1. npm install -g babel followed by babel -d <targetdir> <sourcedir> to transpile
2. npm has a scripts.prepublish that runs a command before publishing. Defining scripts.compile as the command above in #1 and using npm run compile as scripts.prepublish automatically transpiles before publishing
3. Add babel under devDependencies so that npm will add the babel executable to the path before running any scripts (in particular, scripts.prepublish as described above)
4. You'll need npm install core-js for additional features like Map, Set and String.prototype.repeat

see ES6 Features

1. Arrows (as MapReduce)
2. Spread Arguments (I wish you could put them before a single argument, e.g. (...args, callback))
3. Better Object (the ability to have dynamic keys with [ <some expression> ] : <some value> is very convenient)
4. Destructure (it's interesting how {go: here, also: there} => { go: 'one', also: 'two'} assigns here and there)
5. Iterators (these are seriously powerful, but you'd need to think hard for a use case. Generators are a subset of iterators)
6. Person (classes... meh...)

• Map, Set, WeakMap, WeakSet
• Proxies
• Symbols
• Subclassable Built-Ins
• Math + Number + String + Object APIs
• Binary and Octal Literals
• Promises
• Reflect (???)
• Tail Call Optimization (unsupported, sadly)