@runbit/events

A tiny event bus. Everything in Runbit emits events; this is how they travel.

npm install @runbit/events

import { createEventBus } from "@runbit/events";

const bus = createEventBus();

const off = bus.on((event) => console.log(event.type));
bus.onType("tool:end", (event) => console.log("tool done", event.data));

bus.emit({ type: "tool:end", at: Date.now(), data: { name: "weather" } });
off(); // unsubscribe

• on(listener) — every event. Returns an unsubscribe function.
• onType(type, listener) — one event type.

Consumers like @runbit/devtools subscribe here — no manual instrumentation.

Part of Runbit — the AI Runtime. Everything executes through one small, event-driven runtime; agents, workflows, RAG, and observability are packages on top.

• Umbrella: @runbit/runtime
• License: MIT