assert_packages_installed: Assert packages are installed

In assertions: Simple Assertions for Beautiful and Customisable Error Messages

Assert packages are installed

Description

Assert that one or more packages are installed.

Usage

assert_packages_installed(
  x,
  msg = NULL,
  call = rlang::caller_env(),
  arg_name = NULL
)

Arguments

x	Package name(s) (character vector)
msg	A character string containing the error message to display if the package is not installed
call	Only relevant when pooling assertions into multi-assertion helper functions. See cli_abort for details.
arg_name	Advanced use only. Name of the argument passed (default: NULL, will automatically extract arg_name).

Value

invisible(TRUE) if x is installed, otherwise aborts with the message specified by msg

Examples

try({
assert_packages_installed("stats") # Passes
assert_packages_installed(c("stats", "utils")) # Passes
assert_packages_installed("notapackage123") # Throws Error
})

assertions documentation built on Feb. 13, 2026, 5:06 p.m.