emittery
Simple and modern async event emitter
eventemitter3
EventEmitter3 focuses on performance while maintaining a Node.js AND browser compatible interface.
events
Node's event emitter for all engines.
mitt
Tiny 200b functional Event Emitter / pubsub.
eventemitter2
A feature-rich Node.js event emitter implementation with namespaces, wildcards, TTL, async listeners and browser/worker support.