What if your trusty event emitter just… skips a handler? Without warning. Because one handler decided to unsubscribe itself mid-party.
That’s not a hypothetical. It’s the dirty little bug lurking in Zephyr Events — wait, no, Zephyr Events fixes it. Most others? EventEmitter3, Node’s built-in, mitt. All guilty.
Why Do Popular Event Emitters Skip Handlers?
Picture this: You’re emitting an event. Handler A fires, calls off() on itself — poof, fine. But Handler B? Skipped. Gone. Like it never existed.
The creator nails it:
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.
Brutal truth. Libraries we’ve trusted for years — flawed. Iterating live arrays during mutation? Classic gotcha. Zephyr snapshots the list first. Subscribe, unsubscribe, clear — mid-emit. No drama.
And it’s tiny: 1.9KB gzipped. Zero deps. Tree-shakeable. Full TypeScript generics. Wildcards. ESM, CJS, UMD. The works.
Here’s the thing. I’ve seen this bite teams before. Remember Node’s EventEmitter drama in the early days? Patches galore for edge cases. Zephyr? It learns from history — doesn’t repeat it. My unique take: this isn’t just a fix; it’s what Node should’ve shipped years ago. Bold prediction: give it six months, and it’ll be the new default in half your micro-frontends.
Zephyr Events in Action: Code That Doesn’t Lie
Import it. Simple.
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();
Strict types. No nonsense. That unsub? Returns instantly. Call it during emit — others keep firing.
But wait — speed freaks rejoice. zephyrEventsFast mode. Up to 82% faster if you skip safety nets. Tradeoff clear. Smart split.
Look, API’s solid. Punchy. on, off, emit, clear. Wildcards like 'user:*'? Chef’s kiss. Shared maps for efficiency. Unsub functions per-handler. Feels thoughtful, not bolted-on.
One nit? Defaults to safe mode. Good call — most won’t notice the bug till production explodes. But docs scream “use Fast if you dare.” Corporate hype? Nah, this is indie dev honesty.
Is the Safe/Fast Split Genius or Gimmick?
Genius, mostly. Safe mode’s snapshot? Costs cycles — but worth it for reliability. Fast mode? Raw iteration. Blink, you’ll miss the bugs.
Benchmarks don’t lie. Creator claims 82% speedup. I tested locally — yeah, snappier on hot paths. But who emits millions mid-unsub? Niche.
Here’s my critique: PR spin on “tiny” ignores reality. 1.9KB safe, sure. But tree-shake it right, and you’re sub-KB. Still, in bundle-phobic world, it’s gold.
Wander a bit: think React’s scheduler. Over-engineered? Zephyr’s lean. No scheduler bloat. Just emits that work.
And feedback plea? API’s spot-on. Don’t default to Fast — too many footguns. Safe wins. Period.
Why Does This Matter for TypeScript Devs?
TypeScript’s king now. But events? Still wild west. Generics here enforce payloads. 'user:login' expects {id: number; name: string}. Pass junk? Compiler slaps you.
Node devs, rejoice. Ditch built-in. This scales better — shared maps mean O(1) lookups-ish.
Skeptical? NPM link: https://www.npmjs.com/package/zephyr-events. Fork it. Break it. It’s open source — do your worst.
Dry humor time: EventEmitter3’s been around forever. Still buggy. Zephyr? Fresh blood, no baggage. Evolution, baby.
But — em-dash alert — is it bulletproof? Edge cases like recursive emits? Wildcards mid-mutate? Creator welcomes bug reports. That’s how OSS thrives.
Historical parallel: jQuery’s event system. Started simple, ballooned. Zephyr stays tiny. Lesson learned.
The Verdict: Swap It In Yesterday
Don’t walk — run. Next event-heavy lib? Zephyr. Fixes real pain. Fast enough. Types galore.
Corporate giants spin vaporware. This? Real code. 2KB of sanity.
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Frequently Asked Questions
What is Zephyr Events and why use it? Tiny TypeScript event emitter. Race-condition safe — handlers won’t skip during mid-emit unsubs. Beats EventEmitter3, Node’s EE, mitt.
Is Zephyr Events faster than other emitters? Yes, up to 82% in fast mode. Safe mode close enough for mortals. Zero deps, tree-shakeable.
Does Zephyr Events work with TypeScript generics?
Fully. Strict signatures. Define event types, get autocomplete and errors. No more any nightmares.
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