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The new type system features are: keyof, lookup types, and mapped types. Does flow have even one of these?

$Keys<> for keyof, $MapObj<> for mapped types. They are sorely missing lookup types though.

Googling for mapobj doesn't give me any results. Can you point to some documentation on these?

I can't seem to find any info online about $MapObj<>? I searched the docs, google ... nuthin'. Am I just missing something?

Apologies, it's $ObjMap. And it's unfortunately not in the documentation, which could admittedly be improved.