StyLua is a deterministic, highly configurable code‑formatter for Lua and its variants (Lua 5.1‑5.4, LuaJIT, Luau, CfxLua/FiveM). It parses Lua source, re‑prints it following an opinionated style (largely the Roblox Lua style guide) and can be run via CLI, as a language‑server, or integrated into editors, CI pipelines, and package managers. The tool is aimed at Lua developers who want automatic, consistent formatting across projects, with support for custom rules, syntax selection, and extensive installation options.