he/him 
First impressions with TypeScript: - Docs for tsconfig.json are confusing. Why are type checking options under compilerOptions? - The "An import path cannot end in .ts" rule not being optional is maddening
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Object type spreads and opaque type aliases are two of the main Flow features I miss when using TypeScript. On the other hand,
@bcherny's TypeScript book helped me realize that there's a lot of advanced stuff in TypeScript that doesn't exist in Flow.
Having to write `throw new Error()` instead of just using Flow's magic `invariant()` has been another thing making it more painful
