[TomMarius]

    const MyComponent: React.FC<{style?:React.CSSProperties}> = (props) => <div style={{margin: 16, ...props.style}}>{props.children}</div>

I don't see any issue; additionally, it's well typed and you have fine control over it!

[spankalee]

That's not stylable from CSS though, so you have to pass JS props and can't use selectors. It also duplicates styling strings across all similar style attributes which is not good for memory or perf.

[TomMarius]

Noone using React cares about styling from CSS though. It doesn't have to duplicate much, you can use e.g. typestyle or React Native's Stylesheet