determines if the shape of an object's prototype is the same as the shape of another object

isSubclassOf.ts

const isSubclassOf = function isSubclassOf(derived: any, base: any) {
    const pair = [Reflect.getPrototypeOf(derived), base];

    const allKeys = pair.reduce(
        (keys, instance) => keys.concat(Object.keys(instance)),
        []
    );

    const distinctKeys = new Set(allKeys);

    return distinctKeys.size === Object.keys(base).length;
};