callq

callq is a lightweight, zero-dependency async call queue library for Node.js that provides a state machine-like execution of ordered asynchronous operations with support for branch, jump, sub-procedures, loops, forks, and timeouts. Current version 1.0.7 (maintained as of 2023). It differentiates itself by offering a flexible queue structure with sync/async operators, label-based routing, and procedural control flows (if, loop, fork, join) while remaining simple and small. The library uses an error-data-queue callback convention and supports both synchronous returns and asynchronous callbacks via que.next() or que.wait().