he/him 
JS Type Checker Wish List: Regex validated strings
type HexColor = /#[0-9a-f]+/i;
const color: HexColor = '#eee'; // fine
const color: HexColor = 'red'; // error!
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Check Facebook's internal Flow support group. I asked for that feature before, and remember that there was a good reply. That feature would be helpful in many cases.
Just checked and it was "that's a great idea, we don't have time, PRs accepted" which is about what I expected haha
