// Try creating a new interface and extending it like below
interface Rectangle {
height: number,
width: number
}
interface ColoredRectangle extends Rectangle {
color: string
}
const coloredRectangle: ColoredRectangle = {
height: 20,
width: 10,
color: "red"
};
console.log(coloredRectangle);
{ height: 20, width: 10, color: 'red' }