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.