[nailer]

The standard library. There's a few things missing in ES8, but not a huge amount.

Also sugar.js is dead. I maintain http://agavejs.org, an ES8 based replacement, which is stil going.

[have_faith]

The standard library has replaced much of lodash's array utilities but seeing as you can import lodash functions into your project piecemeal it's still useful for the odd utility function here and there.