●Change8

Migrating to Vitest v4.0.0-beta.6

Version v4.0.0-beta.6 introduces 2 breaking changes. This guide details how to update your code.

Released: 8/4/2025

2
Breaking Changes
3
Migration Steps
5
Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

vi.spyOnReporter APIconfig.includeconfig.browser.instances[].includerolldown-vite bundler configuration

Breaking Changes

●Issue #1

Spying implementation was rewritten, causing existing mocks that relied on the previous behavior to break. Update mocks to use the new spying API as described in the updated documentation.

●Issue #2

Reporter deprecated APIs were removed. Refactor any custom reporters or configuration that used the old APIs to the new reporter interface.

Migration Steps

  1. 1
    Review and adjust any spying code to align with the new implementation; refer to the migration guide for the updated API.
  2. 2
    Remove usage of removed reporter APIs and update custom reporters to the current reporter interface.
  3. 3
    If you rely on `config.include`, ensure it is not unintentionally overridden by `config.browser.instances[].include`, or adjust the configuration accordingly.

Release Summary

Vitest v4.0.0-beta.6 introduces a rewritten spying system and removes deprecated reporter APIs, along with several bug fixes and dependency updates.

Need More Details?

View the full release notes and all changes for Vitest v4.0.0-beta.6.

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