Meta developer tools: Working at scale

This post introduces and details Meta's developer tools designed for extreme scale: Sapling (version control with a server, client, and virtual file system using Rust), Buck2 (a large-scale build system supporting remote caching, execution, and multi-language dependencies), and static analysis/testing tools like Infer, RacerD, and Jest. It highlights how these tools address challenges with millions of files and complex codebases, emphasizing their open-source nature and integration with systems like EdenFS and Watchman.