To cite package ‘assertions’ in publications use:

  El-Kamand S (2024). _assertions: Simple Assertions for Beautiful and
  Customisable Error Messages_. R package version 0.2.0,
  <https://CRAN.R-project.org/package=assertions>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {assertions: Simple Assertions for Beautiful and Customisable Error Messages},
    author = {Sam El-Kamand},
    year = {2024},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=assertions},
  }