RequiresEitherProperty.ts

/**
 * Given any object type T, produce a type that requires you to set ONE
 * of its properties, while forbidding any of the others to also be set.
 */
export type RequiresEitherProperty<T extends {}, K extends keyof T = keyof T> = {
    [P in K]: Record<P, T[P]> &
        Partial<{
            [Y in Exclude<K, P>]: never;
        }>;
}[K];