To cite package ‘languageserver’ in publications use:

  Lai R (2023). _languageserver: Language Server Protocol_. R package
  version 0.3.16, <https://github.com/reditorsupport/languageserver>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {languageserver: Language Server Protocol},
    author = {Randy Lai},
    year = {2023},
    note = {R package version 0.3.16},
    url = {https://github.com/reditorsupport/languageserver},
  }