It is my understanding that R code passed on to
reprex::reprex() is evaluated in a new, clean environment, so that no data or settings from the main R session are passed on.
reprex()takes the section of copied code and then runs
rmarkdown::render()on it, which starts a fresh environment, and runs the code.
From the Magic reprex vignette
This does not seem to be true for environment variables though. Apparently, if I change an environment variable in my main R session, the change gets carried through to the
Example: This code chunk was created with
Sys.getenv("R_TEST") #>  ""
After I run
Sys.setenv(R_TEST = "testit") in my main R session,
reprex::reprex() shows this:
Sys.getenv("R_TEST") #>  "testit"
Is this a bug or a feature?