#vitest

Fix Vitest 5 bench No Longer Top-Level Export

Vitest 5 removes bench as a top-level export. Fix it by moving benchmarks into a test() context fixture instead.

Aug 13, 2026Read more →

A dark code editor style panel titled Vitest 5 migration guide - removed entrypoints, listing vitest/reporters, vitest/coverage, vitest/environments, and vitest/snapshot each mapped to their documented replacement

Fix Vitest 5 Cannot Find Module vitest/reporters

Fix Vitest 5's module resolution failure on vitest/reporters and vitest/coverage. Vitest 5 removes eight subpath imports; use vitest/node instead.

Aug 13, 2026Read more →

vitest.config.ts diff showing clearMocks changing from its old false default to Vitest 5's new true default

Guides & Fixes

Fix Vitest 5 clearMocks Breaking Mock State

Fix Vitest 5's clearMocks: true default wiping mock call history between tests, and decide whether to restore it or fix the test.

Aug 13, 2026Read more →

Command-line diff showing vitest run from a subdirectory failing to find a parent config, fixed by adding an explicit --config flag

Guides & Fixes

Fix Vitest 5 Config Not Found in Parent Directory

Fix Vitest 5 no longer finding a vitest.config.ts in a parent directory when run from a subdirectory. Pass --config explicitly.

Aug 13, 2026Read more →

Vitest's documented expect.poll timeout error message, expect.poll() function didn't resolve in time, next to a code example passing the callback's new AbortSignal parameter to fetch

Guides & Fixes

Fix Vitest 5 expect.poll Timeout Error

Vitest 5 throws 'expect.poll() function didn't resolve in time.' on timeout instead of letting a late result pass. Here's the fix.

Aug 13, 2026Read more →

A dark code editor style panel titled vitest.config.ts - projects extends option, showing extends now defaults to true and listing what an inline project inherits automatically, with extends: false as the opt-out

Guides & Fixes

Fix Vitest 5 Projects Not Inheriting Root Config

Vitest 5's extends option defaults to true, so inline test.projects now inherit root plugins and setupFiles automatically. Fix it with extends: false.

Aug 13, 2026Read more →

Code diff showing test.sequential and describe.sequential calls replaced with the concurrent: false option in Vitest 5

Guides & Fixes

Fix Vitest 5 test.sequential Removed Error

Fix Vitest 5 removing test.sequential, describe.sequential, and the sequential option. Replace them with concurrent: false.

Aug 13, 2026Read more →

A dark code editor style panel titled vitest.config.ts - toThrow matcher change, contrasting Vitest 4's empty-message-only match against Vitest 5's match-any-error behavior with the fix below it

Guides & Fixes

Fix Vitest 5 toThrow('') Silently Passing Tests

Vitest 5 changes toThrow('') to match any thrown error, not just an empty message. Fix the silent false-pass with toThrow(/^$/) or toThrow().

Aug 13, 2026Read more →

Terminal window showing a Vitest test with an unawaited resolves.toBe assertion, annotated with Vitest 4's pass-with-warning behavior versus Vitest 5's fail behavior, next to the one-line await fix

Guides & Fixes

Fix Vitest 5 Unawaited Async Assertion Error

Vitest 5 fails tests outright on an unawaited async assertion instead of just warning. Here's why, and the one-line fix.

Aug 13, 2026Read more →

Terminal output showing Vitest's documented error: 1 call in calculator.test.ts was defined outside of the module's top level scope, pointing at a nested vi.mock call

Guides & Fixes

Fix Vitest 5 vi.mock Top-Level Scope Error

Fix Vitest 5's "defined outside of the module's top level scope" error thrown by vi.mock, vi.unmock, and vi.hoisted.

Aug 13, 2026Read more →

A dark comparison-matrix style cover listing Vitest 5.0 beta's breaking changes across three groups: mocking (vi.mock scope, clearMocks default flip), config (projects inheritance, parent-directory lookup), and assertions (expect.poll, async awaits, toThrow(''))

Guides & Fixes

Vitest 5.0 Beta Breaking Changes: Full Guide

Vitest 5.0 beta ships 10 breaking changes across mocking, config, and assertions. Full rundown, sourced to the official migration guide, plus fixes.

Aug 13, 2026Read more →