Get the first or all references of an R object

Assert that there are no references among the identified globals

find_references(x, first_only = FALSE)

assert_no_references(
  x,
  action = c("error", "warning", "message", "string"),
  source = c("globals", "value")
)

Arguments

x: The R object to be checked.
first_only: If TRUE, only the first reference is returned, otherwise all references.
action: Type of action to take if a reference is found.
source: Is the source of x the globals or the value of the future?

Value

find_references() returns a list of zero or more references identified.

If a reference is detected, an informative error, warning, message, or a character string is produced, otherwise NULL is returned invisibly.