To cite package ‘favr’ in publications use:

  Jenkins L (2025). _favr: Function Argument Validation_. R package
  version 1.0.0.9000, <https://github.com/lj-jenkins/favr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {favr: Function Argument Validation},
    author = {Luke Jenkins},
    year = {2025},
    note = {R package version 1.0.0.9000},
    url = {https://github.com/lj-jenkins/favr},
  }