- Added @format header workflow with lint autofix, scripts and tracking to enable incremental Prettier adoption across Facebook codebases.
- Extended language support with many Flow and template literal improvements (trailing commas, inline nullable, proper indentation, Windows line endings) and continued TypeScript support progress.
- Implemented numerous JavaScript formatting fixes such as inline single‑arg functions, avoiding breaks on empty arrays/objects, correct do‑while indentation, preserving inline comments, and reverting problematic class‑in‑arrow formatting.
