Zephyr Events – A 2KB TypeScript event emitter that's race-condition safe

I built a tiny event emitter that fixes a bug most people don't know they have: if a handler calls off() on itself during emit, the next handler gets skipped. EventEmitter3, Node's built-in EventEmitter, and mitt all have this problem. Zephyr Events uses snapshot-based iteration so handlers can subscribe, unsubscribe, or clear listeners mid-emit without side effects. If you don't need that safety, there's a zephyrEventsFast mode that's up to 82% faster. 1.9KB, zero dependencies, tree-shakeable Full TypeScript generics with strict handler signatures Wildcard listeners, shared handler maps, unsubscribe functions ESM, CommonJS, and UMD builds import zephyrEvents from 'zephyr-events'; type Events = { 'user:login': { id: number; name: string } 'error': Error } const emitter = zephyrEvents<Events>(); const unsub = emitter.on('user:login', (user) => { console.log(`Welcome, ${user.name}`); }); emitter.emit('user:login', { id: 1, name: 'Alice' }); unsub(); https://www.npmjs.com/package