Retrieves global variables of an expression and their associated packages
getGlobalsAndPackages(expr, envir = parent.frame(), tweak = tweakExpression,
globals = TRUE, resolve = getOption("future.globals.resolve", FALSE),
persistent = FALSE, ...)An R expression whose globals should be found.
The environment from which globals should be searched.
(optional) A function that takes an expression and returned a modified one.
(optional) a logical, a character vector, a named list, or a Globals object. If TRUE, globals are identified by code inspection based on expr and tweak searching from environment envir. If FALSE, no globals are used. If a character vector, then globals are identified by lookup based their names globals searching from environment envir. If a named list or a Globals object, the globals are used as is.
If TRUE, any future that is a global variables (or part of one) is resolved and replaced by a "constant" future.
persistent If TRUE, non-existing globals (= identified in expression but not found in memory) are always silently ignored and assumed to be existing in the evaluation environment. If FALSE, non-existing globals are by default ignored, but may also trigger an informative error if option future.globals.onMissing == "error".
Not used.
A named list with elements expr (the tweaked expression), globals (a named list) and packages (a character string).
Internally, globalsOf() is used to identify globals and associated packages from the expression.