Your library looks awesome, except one little part.

When I change a name of a property I want the Typescript compiler to throw me a warning about where that property was in the project, so I can go and change them.

So, it's more of a suggestion than an issue, to actually have it like this:

RuleFor(x => x.name)

You have already the structure of a type generic so that means that you have thought of that. Anyways, something to think of!