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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If you're using a static type checker then your codebase is already covered with annotations. HexColor would just be typed as a string which doesn't given you the level of safety that this does.
End of conversation
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