This project is based on Newsom's handy text, Longitudinal structural equation modelling: A comprehensive introduction. You can get the data and original lavaan code at the book's website, http://www.longitudinalsem.com. I’m slowly going through the text, largely for the work I do at my postdoc. The lavaan package has changed a bit since the book was published, so I’m updating that code as I go along.
I might eventually get around to stitching this together as an online book with bookdown. There's no anticipated completion date. Maybe in a few years. In the meantime, feel free to browse and make suggestions.