sample.ts

import React from 'react'

interface ButtonProps {
    shape: 'circle'|'rectangle'|'oval'
}

function Button(props: ButtonProps) {
    // renders some pretty button
    return <button>Heyo</button>
}

class Button2 extends React.Component<ButtonProps> {
    render(){
        return <button>LOL</button>
    }
}

// Only Button is exported from a library; its props are not.
// Now I want to wrap it in my own component, and inherit all of Button's props


type GetComponentProps<A> = A extends React.FunctionComponent<infer P> ? P : (A extends React.ComponentClass<infer P> ? P : never)

type MyButtonProps =  GetComponentProps<typeof Button2> & {
    //                          ^^^^^^^^^^^^^^^^^^^^^-------- SOMETHING LIKE THIS???
    anotherFeature: string
}
function MyButton({anotherFeature, ...rest}: MyButtonProps) {
    return <Button {...rest}>Sup</Button>
}