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type numberOrString = number | string
type numberType = 1|2|3|4|5|6|7|8
type letterType = 'a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'i'
// https://www.typescriptlang.org/docs/handbook/2/types-from-types.html
xxxxxxxxxx
type Props = {
item: CartItemType;
addToCart: (clickedItem: CartItemType) => void;
removeFromCart: (id: number) => void;
};