zk‑lock is a Node.js library that implements a distributed lock primitive on top of Apache Zookeeper, following Zookeeper’s official lock recipe. It provides a simple `ZookeeperLock` class with static and instance methods for configuring, acquiring, and releasing locks (including options for fail‑fast, lock prefixes, and concurrent holders), and emits events when a session timeout causes the lock to be lost. The package is aimed at developers building distributed Node.js applications that need reliable coordination of shared resources across multiple processes or machines.