interface Cache {
    name: string
}

class MemoryCache implements Cache {
    name= "memory"
}

// Does not implement Cache interface
class DiskCache {}

interface CacheProvider {
    getCache: () => Cache
}

// Does not error because DiskCache isn't a valid Cache implementation ?!?!
class LocalCacheProvider implements CacheProvider {
    getCache() {
        return DiskCache;
    }
}