he/him 
Any alternative to TypeScript needs to support .d.ts as the canonical format for typing dependencies. Basically impossible to build any significant momentum without it.
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I agree. But do you envision a TypeScript alternative to take a different tack on typing (eg nominal vs structural), or just leverage typings but be a different language (like some sort of TypedCoffeeScript)?
Could do either. I don't think the types need to be 100% lossless, they should just represent the closest equivalent in the alt type system. As long as they're consistent then it seems fine.
