To cite package ‘opt’ in publications use:

  Fabri A (2023). _opt: Set Options Conveniently_. R package version
  0.0.0.9000, <https://github.com/moodymudskipper/opt>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {opt: Set Options Conveniently},
    author = {Antoine Fabri},
    year = {2023},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/moodymudskipper/opt},
  }