Meta uses https://github.com/facebook/sapling https://github.com/facebook/sapling see: https://engineering.fb.com/2022/11/15/open-source/sapling-source-control-

Meta uses https://github.com/facebook/sapling https://github.com/facebook/sapling see: https://engineering.fb.com/2022/11/15/open-source/sapling-source-control-scalable/ https://engineering.fb.com/2022/11/15/open-source/sapling-so... It’s an extension from Mercurial as the blog post states.