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Sys.getenv("RSTUDIO_VERSION")

## [1] "2021.09.0.351.6"

Sys.getenv("RSTUDIO_LONG_VERSION")

## [1] "2021.09.0+351.pro6"

package_version(Sys.getenv("RSTUDIO_VERSION"))

## [1] '2021.9.0.351.6'