Simple Assertions for Beautiful and Customisable Error Messages R package assertions version 0.3.0 Provides simple assertions with sensible defaults and customisable error messages. It offers convenient assertion call wrappers and a general assert function that can handle any condition. Default error messages are user friendly and easily customized with inline code evaluation and styling powered by the 'cli' package. Software Imports: cli, glue, methods, rlang Suggests: covr, knitr, rmarkdown, shiny, testthat (>= 3.0.0), withr Sam El-Kamand <sam.elkamand@gmail.com> Comprehensive R Archive Network (CRAN) Sam El-Kamand [aut, cre, cph] (ORCID: <https://orcid.org/0000-0003-2270-8088>) MIT + file LICENSE (https://CRAN.R-project.org/package=assertions/LICENSE) 2026-02-13 application/tgz https://CRAN.R-project.org/package=assertions doi:10.32614/CRAN.package.assertions