I know some undergraduate analysis books (like Baby Rudin) has its last chapter about Lebesgue theory but that book already is called "Principles of Mathematical Analysis" so the book wouldn't be used for a calculus course.
I'm looking for a book that (1) is about calculus but (2) directly references analysis topics and what kind of courses come after calculus classes.
Most often the books give a vague idea of "this topic will be seen in more advanced/future/later courses" but there's nothing explicitly mentioned.





The book Single Variable Differential and Integral Calculus by Elimhan Mahmudov covers most of what you would expect from an undergraduate Calculus textbook and includes a section of Lebesgue Integrals.