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README.md

@vitest/web-worker

Web Worker support for Vitest testing. Doesn't require JSDom.

Simulates Web Worker, but in the same thread. Supports both new Worker(url) and import from './worker?worker.

Installing

# with npm
npm install -D @vitest/web-worker

# with pnpm
pnpm install -D @vitest/web-worker

# with yarn
yarn install -D @vitest/web-worker

Usage

Just import @vitest/web-worker in your test file to test only in current suite.

Or add @vitest/web-worker in your setupFiles, if you want to have a global support.

import { defineConfig } from 'vitest/node'

export default defineConfig({
  test: {
    setupFiles: ['@vitest/web-worker'],
  },
})

Examples

// worker.ts
import '@vitest/web-worker'
import MyWorker from '../worker?worker'

self.onmessage = (e) => {
  self.postMessage(`${e.data} world`)
}

// worker.test.ts
let worker = new MyWorker()
// new Worker is also supported
worker = new Worker(new URL('../src/worker.ts', import.meta.url))

worker.postMessage('hello')
worker.onmessage = (e) => {
  // e.data equals to 'hello world'
}

Notice

  • Does not support onmessage = () => {}. Please, use self.onmessage = () => {}.