Mago is a PHP toolchain. I guess it is something similar to ruff/ty/pyrefly in Python, oxc in JavaScript, or Lux in Lua because it emphasis its speed and it is written in Rust. The author is also a maintainer of psl[1] and listed in JetBrains’ 2025-2026 sponsorship program.[2]

• 1: https://packagist.org/packages/azjezz/psl
• 2: https://blog.jetbrains.com/phpstorm/2025/10/moving-php-open-source-forward/