Web Worker — Bun.Worker Wrapper #17

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opened 2026-06-17 14:01:50 +00:00 by Artur · 1 comment

Artur commented

2026-06-17 14:01:50 +00:00

Owner

Goal

Implement Worker in the global scope so that new Worker(url) works.

What to Build

src/workers/worker.ts — WorkerShim class wrapping Bun.Worker
Register globalThis.Worker in createIsolatedContext
WorkerShim.postMessage() / onmessage / terminate() / onerror

Key Insight

Bun has native Bun.Worker — we just wrap it:

new Worker(url) → new Bun.Worker(url)
postMessage(msg) delegates
onmessage setter wraps Bun.Worker's message event
terminate() kills the worker

Tests (110%)

Worker is defined in global scope
new Worker(url) creates worker
onmessage receives messages from worker
postMessage sends messages to worker
terminate() kills worker
error event fires on error
multiple workers are independent
Worker works inside isolated context
Worker has no DOM

## Goal Implement `Worker` in the global scope so that `new Worker(url)` works. ## What to Build 1. `src/workers/worker.ts` — WorkerShim class wrapping `Bun.Worker` 2. Register `globalThis.Worker` in createIsolatedContext 3. `WorkerShim.postMessage()` / `onmessage` / `terminate()` / `onerror` ## Key Insight Bun has native `Bun.Worker` — we just wrap it: - `new Worker(url)` → `new Bun.Worker(url)` - `postMessage(msg)` delegates - `onmessage` setter wraps Bun.Worker's message event - `terminate()` kills the worker ## Tests (110%) - Worker is defined in global scope - new Worker(url) creates worker - onmessage receives messages from worker - postMessage sends messages to worker - terminate() kills worker - error event fires on error - multiple workers are independent - Worker works inside isolated context - Worker has no DOM