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A comment on TypeScript 1.4 sneak peek: union types, type guards, and more. Parent comment
I believe all 3 teams, TypeScript, Flow, and AtScript, are working together for few things as is.
If you look at that TypeScipr PR, you see it closes an issue and they reference (2 months ago) Flow there.
I believe all 3 teams, TypeScript, Flow, and AtScript, are working together for few things as is.