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Lightweight library for asynchronous task scheduling and concurrency control in JavaScript. Works in browsers, Node.js, Deno, and Bun.
For installation, quick start, and browser notes see the README.
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- Scheduler — time-based task scheduling (delays, dates, repeats)
- IdleQueue — run tasks during browser idle periods
- FrameQueue — run tasks in animation frames
- LimitedQueue — concurrency-controlled async queue
- PageWatcher — react to page lifecycle changes
- sleep() — promise-based delay
- defer() — execute on next tick
- throttle() — rate-limit a function (first call wins)
- debounce() — delay until input stabilizes
- sample() — sample at regular intervals
- audit() — collect then execute after delay
- batch() — run async ops with concurrency limit
- waitFor() — poll a condition until it turns truthy
- Throttler — key-based rate limiting
- Retainer — resource lifecycle management
- Counter — track pending task counts
- CancelTaskError — cancellation error class
- MicroTask — base task unit
- MicroTaskQueue — abstract queue base class
- ListQueue — linked-list queue implementation
- random-dist — random numbers (uniform, normal, exponential, Pareto)
- random-sleep — randomized delays from various distributions
- whenDomLoaded() — run code when DOM is ready
- whenLoaded() — run code when page is fully loaded
- Testing race conditions — property-based race testing of queues with fast-check
- Release notes — version history and changelog
- AGENTS.md — project conventions for contributors and AI coding assistants
- llms.txt — machine-readable project summary
- llms-full.txt — full API reference for LLMs