To cite package ‘arg’ in publications use:

  Greifer N (2026). _arg: Clean and Simple Argument Checking_. R
  package version 0.1.1, <https://github.com/ngreifer/arg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {arg: Clean and Simple Argument Checking},
    author = {Noah Greifer},
    year = {2026},
    note = {R package version 0.1.1},
    url = {https://github.com/ngreifer/arg},
  }