sindresorhus/type-fest ? reverse-engineered prompt

I'm working on a project with TypeScript, and I keep needing to create complex types for common situations, which feels like I'm reinventing the wheel. I want you to create a utility library, basically a big collection of essential, ready-to-use TypeScript types that feel like they should have been built-in.

It should handle things like manipulating object types, for example, creating a new type by removing a key from another one, or merging two types together, even if they have nested properties. I also need types that help enforce rules, like requiring an object to have at least one of a specific set of keys. The goal is a toolbox of powerful, generic types that I can just import and use in any TypeScript project to make my code safer and more expressive. This should be set up as an npm package.