EDIT: this is now better-documented in the Features.md file. Leaving the below for posterity.

@DomVinyard proposed these as the "core four" for this effort:

• Classes
• Import/Export
• Fat-Arrow Functions
• Async/Await

These are things that we "absolutely, definitely need", and will take priority over other changes.

However, this list may be too short. Other possibilities:

• let/const/var
• decorators
• for-in/for-of
• getters/setters/statics/methods

In particular, Async/Await, being less widely supported and used at this point, may not make sense to take priority over more widely used features like decorators, or more core-to-the-language features likeconst andfor.

Thoughts?

EDIT: I'll keep this bit as an evolving understanding:

Tier 1

(features essential for JavaScript interop):

• Classes
• Modules

Tier 1A

(breaking changes that catch CS up with ES6)

• for-of/for-in
• let/const/var

Tier 2

(non-essential, popular ES6 Good Parts)

• async/await
• decorators
• getters/setters/statics/methods
• fat-arrow functions

Tier 3

(non-essential ES6 features and new features)

• ?