EventEmitterXTypeScript Event System

Cross-platform EventEmitter and Reactive Signals for Node.js and browsers.

EventEmitterX

Cross-platform EventEmitter compatible with Node.js and browsers. Drop-in replacement with listenerOncePerEventType, emitCounter, advanced static once() with filters/timeouts/AbortSignal, and async iterators.

API Reference

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EventSignal

Reactive signals system with automatic dependency tracking, computed values (sync & async), and deep React integration. Signals can be rendered directly in JSX.

API Reference

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Live Demo

Try EventSignal in an interactive demo application built with React 19 and Vite.

Open Demo ↗

Core Modules

Module	File	Description
EventEmitterX	`modules/events.ts`	Cross-platform EventEmitter for Node.js and browsers. Drop-in replacement with enhanced features.
EventSignal	`modules/EventEmitterEx/EventSignal.ts`	Reactive signals system with dependency tracking and React integration.
eventsAsyncIterator	`modules/EventEmitterEx/eventsAsyncIterator.ts`	Async iterator for event streams, compatible with Node.js `events.on()`.
view_utils	`modules/EventEmitterEx/view_utils.ts`	(BETA) React ViewContext utilities for EventSignal.
utils	`modules/EventEmitterEx/utils.ts`	Shared utility functions: JSON serialization, runtime detection.

Module Dependency Graph

EventEmitterX (events.ts)
├── uses: abortable, object utils
└── exports: EventEmitterX, once, on, addAbortListener, errorMonitor, ...

EventSignal (EventSignal.ts)
├── uses: EventEmitterX (internally for signal/subscriber/timer event buses)
├── uses: abortable, type_guards, runEnv
├── uses: view_utils (React ViewContext)
├── uses: utils (serialization)
└── exports: EventSignal, isEventSignal

eventsAsyncIterator (eventsAsyncIterator.ts)
├── uses: abortable
└── exports: eventsAsyncIterator (aliased as EventEmitterX.on)