How to use QGIS expressions in qgisprocess?
In qgisprocess: Use 'QGIS' Processing Algorithms

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)
can_build <- qgisprocess::has_qgis() &&
  package_version(qgisprocess::qgis_version(full = FALSE)) >= "3.30.0" &&
  requireNamespace("sf", quietly = TRUE)

cat("This vignette has been built in absence of a QGIS installation with version >= 3.30.0, or in absence of the sf package.\n\n")
cat("Read it online at <https://r-spatial.github.io/qgisprocess/articles/qgis_expressions.html>.")