Devtools sets a number of environmental variables to ensure consistent between the current R session and the new session, and to ensure that everything behaves the same across systems. It also suppresses a common warning on windows, and sets NOT_CRAN so you can tell that your code is not running on CRAN. If NOT_CRAN has been set externally, it is not overwritten.

## Usage

r_env_vars()

## Value

a named character vector