Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/cache@v4, r-lib/actions/setup-r@6f6e5bc62fba3a704f74e7ad7ef7676c5c6a2590. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

file=R/check_homogeneity.R,line=84,col=3,[if_switch_linter] Prefer switch() statements over repeated if/else equality tests, e.g., switch(x, a = 1, b = 2) over if (x == "a") 1 else if (x == "b") 2.

file=R/check_group_variation.R,line=325,col=5,[return_linter] Use implicit return behavior; explicit return() is not needed.

file=R/check_group_variation.R,line=318,col=7,[return_linter] Use implicit return behavior; explicit return() is not needed.

file=R/check_group_variation.R,line=316,col=7,[return_linter] Use implicit return behavior; explicit return() is not needed.

file=R/check_group_variation.R,line=307,col=27,[paste_linter] Use paste(), not paste0(), to collapse a character vector when sep= is not used.

file=R/check_group_variation.R,line=307,col=27,[paste_linter] toString(.) is more expressive than paste(., collapse = ", "). Note also glue::glue_collapse() and and::and() for constructing human-readable / translation-friendly lists

file=R/check_group_variation.R,line=292,col=14,[scalar_in_linter] Use comparison operators (e.g. ==, !=, etc.) to match length-1 scalars instead of %in%. Note that if x can be NA, x == 'arg' is NA whereas x %in% 'arg' is FALSE, so consider extra protection for the missing case in your code.

file=R/check_group_variation.R,line=150,col=3,[object_overwrite_linter] 'by' is an exported object from package 'base'. Avoid re-using such symbols.

file=R/check_factorstructure.R,line=230,col=3,[return_linter] Use implicit return behavior; explicit return() is not needed.