`ts-transformer-keys` is a TypeScript custom transformer that enables developers to obtain the keys of a given type at compile time. It's designed for TypeScript developers who need to work with type-safe key extraction, particularly in scenarios where they want to ensure the keys match the structure of a specific type. The package provides a `keys` function that, when used with the custom transformer, compiles to an array of the type's keys, enhancing type safety and reducing runtime errors.