[roboguy12]

FWIW, Typescript also has async/await, as of 2.1 (in reference to the Alternative section in your README).

[jsynowiec]

The alternative refers to an alternative type checking system - Flowtype. Not that the seconds has the async/await and modules. Both repositories are trying to deliver quite similar tools - type checking, es6 + async/awat + import syntax and linter.