checkpoint

Installs packages from MRAN snapshots for a specific date, acting as a 'CRAN time machine' to ensure scripts run with exact versions even years later, as highlighted in the README.

Creates separate library directories per project without affecting global libraries, enabling management of multiple projects with different package versions, a core feature described in the overview.

Scans R code for library(), require(), ::, and ::: calls to identify required packages, automating setup and reducing manual tracking, as detailed in the usage section.

With a simple checkpoint() call at the top of scripts, collaborators automatically install correct versions, making reproducibility effortless for shared projects, per the README's examples.