It currently has the following variables:
CYGWIN="nodosfilewarning": On Windows, do not warn about MS-DOS
style file names.
R_TESTS="" This variable is set by
R CMD check, and makes the
child R process load a startup file at startup, from the current
working directory, that is assumed to be the
of the package being checked. If the current working directory is
changed to something else (as it typically is by
testthat, then R
cannot start. Setting it to the empty string ensures that
be used from unit tests.
R_BROWSER="false": typically we don't want to start up a browser
from the child R process.
R_PDFVIEWER="false": similarly for the PDF viewer.
callr also sets the
R_PROFILE_USER environment variables
appropriately, unless these are set by the user in the
r, etc. calls.
A named character vector of environment variables.
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