To cite package ‘precondition’ in publications use:

Zakharko T (2023). precondition: Lightweight Precondition, Postcondition, and Sanity Checks. R package version 0.1.0, https://github.com/tzakharko/precondition.

Corresponding BibTeX entry:

  @Manual{,
    title = {precondition: Lightweight Precondition, Postcondition, and
      Sanity Checks},
    author = {Taras Zakharko},
    year = {2023},
    note = {R package version 0.1.0},
    url = {https://github.com/tzakharko/precondition},
  }