`stdout-update` is a tiny Node.js library that lets CLI programs rewrite the last lines they printed without disturbing any interleaved output from other sources (e.g., console.log, console.error). It works by hooking into stdout/stderr, tracking the previous update block, and cleanly overwriting it while preserving the surrounding log history—ideal for progress spinners, status dashboards, or any interactive terminal tool that needs real‑time visual updates.