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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You could change your CSS-in-JS library’s API a bit and use opaque types to be fully safe. E.g. instead of colour being a string it has to be an opaque type RGB that can only be created using an rgb function that takes three numbers. + other cases.
I don't want runtime validation of the types, and the CIJ library needs all style values to be static.
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Yeah. It can still all be static. (I know which library you’re talking about) color: rgb(100, 200, 100); The rgb function can just be a stub for types and be compiled away at build time.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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