To cite package ‘performance’ in publications use:

  Lüdecke et al., (2021). performance: An R Package for Assessment,
  Comparison and Testing of Statistical Models. Journal of Open Source
  Software, 6(60), 3139. https://doi.org/10.21105/joss.03139

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{performance}: An {R} Package for Assessment, Comparison and Testing of Statistical Models},
    author = {Daniel Lüdecke and Mattan S. Ben-Shachar and Indrajeet Patil and Philip Waggoner and Dominique Makowski},
    year = {2021},
    journal = {Journal of Open Source Software},
    volume = {6},
    number = {60},
    pages = {3139},
    doi = {10.21105/joss.03139},
  }