There's no reasonable way to write code suitable for "production" in general, because there are so many conflicting requirements. Just among internet services,

There's no reasonable way to write code suitable for "production" in general, because there are so many conflicting requirements. Just among internet services, components need different kinds of robustness for content websites, communication, e-commerce, email, banking, social networks, internal corporate services, and more. There do exist components suitable for most environments, like Postgres, but usually at the cost of 10x complexity over what'd be needed for the pure functionality. That engineering is worth it for things like databases that get used everywhere, but not for any custom component.