quickbit‑universal is a small Node.js library that provides fast, bit‑level operations on Buffer‑based bitfields. It wraps the native libquickbit implementation when available and falls back to a pure‑JavaScript version, exposing functions such as `get`, `set`, `fill`, `clear`, `findFirst/Last`, and an index helper for efficiently querying sparse bit ranges. The package is aimed at developers who need high‑performance manipulation of large bitmaps (e.g., bitmap indexes, bloom filters) in JavaScript environments.