vitest-5-0-0-6-b

Question

Which browser providers can Vitest browser mode use?

Answer key

A correct answer says

The WebdriverIO provider was not removed. @vitest/browser-webdriverio (import { webdriverio }, used as test.browser.provider: webdriverio()) moved out of the core repo and is now community maintained in the vitest-community organization; version 5.0.0 is published and works with Vitest 5.

The stale answer

Use @vitest/browser-webdriverio as a browser mode provider.

Answer

Vitest browser mode supports three providers:

- **Playwright** (`@vitest/browser-playwright`): runs Chromium, Firefox and WebKit. It's the recommended choice for CI and parallel runs.
- **WebdriverIO** (`@vitest/browser-webdriverio`): runs Chrome, Firefox, Edge and Safari through WebDriver.
- **Preview** (`@vitest/browser-preview`): opens the tests in your real local browser. It's only meant for local development and doesn't support headless mode or CI.

Since Vitest 4, you choose one by importing its factory function and passing it to `test.browser.provider`, for example `provider: playwright()`. Before that, you passed a string such as `'playwright'`.

This answer is from my own knowledge of Vitest 4. I didn't check it against the vitest 5.0.3 installed here, and the project's notes on 5.x changes don't mention providers.

Answering cost $0.07.

Grade

wrong

The judge's reason: It lists @vitest/browser-webdriverio as an ordinary provider, matching the stale answer, and never says it moved to community maintenance in vitest-community with a 5.0.0 release for Vitest 5.

The judge's log

Session log

What the agent wrote, the tools it called, and what they returned, from docs/bench/2026-10-11-done3/runs/B-project-sync/vitest-5-0-0-6-b.jsonl. Thinking and the session's settings are left out. The raw log

1. Agent

   Vitest browser mode supports three providers:
   
   - **Playwright** (`@vitest/browser-playwright`): runs Chromium, Firefox and WebKit. It's the recommended choice for CI and parallel runs.
   - **WebdriverIO** (`@vitest/browser-webdriverio`): runs Chrome, Firefox, Edge and Safari through WebDriver.
   - **Preview** (`@vitest/browser-preview`): opens the tests in your real local browser. It's only meant for local development and doesn't support headless mode or CI.
   
   Since Vitest 4, you choose one by importing its factory function and passing it to `test.browser.provider`, for example `provider: playwright()`. Before that, you passed a string such as `'playwright'`.
   
   This answer is from my own knowledge of Vitest 4. I didn't check it against the vitest 5.0.3 installed here, and the project's notes on 5.x changes don't mention providers.