vitest-dev/vitest

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Next generation testing framework powered by Vite.

Stars: 17.1k
Forks: 2k
Open beginner issues: 5
Indexed issues: 343
Avg merge: 1d 22h
Merged PRs (30d): 94

Dominant language: TypeScript
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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343 open issues indexed

Concurrent API-token initialization can hang browser tests Open

pending triage

Difficulty 4/5 3-5 days Newbie friendliness 58/100

vitest-dev/vitest#11315 · Opened Sep 20, 2026
`toHaveFocus()` never match for shadow root descendants Open

pending triage

Difficulty 3/5 1-2 days Newbie friendliness 72/100

vitest-dev/vitest#11311 · Opened Sep 18, 2026
A dynamic import() inside a vi.hoisted factory silently drops the file's vi.mock registrations (5.0 regression, all pools) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11310 · 2 comments · Opened Sep 18, 2026
vi.spyOn on both `get` and `set` of the same property: restore reinstalls the sibling's mock Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

vitest-dev/vitest#11306 · Opened Sep 18, 2026
Native runner manual mocks drop exports re-exported with export * Open

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

vitest-dev/vitest#11297 · Opened Sep 16, 2026
toContainEqual, toHaveProperty, toBeOneOf and return matchers treat any two Maps or Sets as equal Open

p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 30/100

vitest-dev/vitest#11296 · 1 comment · Opened Sep 16, 2026
The above dynamic import cannot be analyzed by Vite Open

pending triage

Difficulty 3/5 1-2 days Newbie friendliness 52/100

vitest-dev/vitest#11293 · 2 comments · Opened Sep 16, 2026
threads pool worker isolate SIGSEGVs in V8 GC on large suites (vite 8 rolldown, node 24/26, macOS arm64) Open

pending triage

Difficulty 5/5 Over a week Newbie friendliness 38/100

vitest-dev/vitest#11291 · 2 comments · Opened Sep 16, 2026
vmThreads + isolate:false + deps.optimizer: vi.mock misses and duplicate module identity — green on 4.1.11, flaky every run on 5.0.1 Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

vitest-dev/vitest#11289 · Opened Sep 16, 2026
v5: v8 coverage makes hook-heavy tests (1000× renderHook mount/unmount cycles) ~3-6x slower in-suite vs vitest 4 Open

needs reproduction

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vitest-dev/vitest#11285 · 1 comment · Opened Sep 16, 2026
vmThreads: file-scoped vi.mock factory from one test file intermittently resolves against another file's imports (isolate: true, v4 & v5) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vitest-dev/vitest#11284 · Opened Sep 16, 2026
`defineCacheKeyGenerator` not distinguishing common files that a plugin process differently in two projects Open

pending triage

Difficulty 3/5 1-2 days Newbie friendliness 74/100

vitest-dev/vitest#11281 · Opened Sep 16, 2026
Pass configOptions to environment setup Open

enhancement: pending triage

Difficulty 3/5 1-2 days Newbie friendliness 68/100

vitest-dev/vitest#11277 · 1 comment · Opened Sep 15, 2026
Browser Mode: Vite warns Plugin "vitest:mocks:interceptor" defines Vite-specific hooks (configureServer) in a plugin returned from applyToEnvironment on every run Open

pending triage

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

vitest-dev/vitest#11276 · 3 reactions · Opened Sep 15, 2026
Make `.vitest` artifact directory configurable Open

enhancement: pending triage p2-to-be-discussed

Difficulty 4/5 3-5 days Newbie friendliness 68/100

vitest-dev/vitest#11269 · 2 reactions · Opened Sep 14, 2026
why-is-node-running is pinned to ^2.3.0, which keeps stackback@0.0.2 (2012, archived upstream) in every dependency tree Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

vitest-dev/vitest#11257 · Opened Sep 14, 2026
Browser mode: mock is intermittently not applied and the real module is loaded (playwright provider) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11251 · 1 comment · Opened Sep 13, 2026
fsModuleCache serves a stale transform after a dependency is renamed (Cannot find module) Open

p3-minor-bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11246 · Opened Sep 12, 2026
`fsModuleCache` cannot be shared between checkouts: keys hash absolute module ids and the absolute root Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

vitest-dev/vitest#11244 · Opened Sep 11, 2026
Browser mode hangs for ever when a test iframe never fires `load` Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

vitest-dev/vitest#11243 · 1 comment · Opened Sep 11, 2026
A fixture whose setup throws is never set up again Open

p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

vitest-dev/vitest#11237 · Opened Sep 11, 2026
v5 browser mode no longer serves /mockServiceWorker.js (undocumented) Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

vitest-dev/vitest#11230 · 3 comments · 3 reactions · Opened Sep 11, 2026
Root `Vitest._tmpDir` is never removed, so every successful run leaks a directory in os.tmpdir() Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

vitest-dev/vitest#11224 · 2 comments · Opened Sep 10, 2026
Coverage `text` reporter prints an empty table frame under agent detection when every file is 100% covered Open

feat: coverage p2-nice-to-have

Difficulty 3/5 1-2 days Newbie friendliness 72/100

vitest-dev/vitest#11186 · 3 comments · Opened Sep 8, 2026
toMatchScreenshot skips createDiff:true when the first capture is stable against the reference Open

Difficulty 3/5 1-2 days Newbie friendliness 82/100

vitest-dev/vitest#11178 · 1 comment · Opened Sep 8, 2026
`@vitest/browser` forces `@vue/compiler-core` to its CJS build Open

pending triage

Difficulty 3/5 1-2 days Newbie friendliness 76/100

vitest-dev/vitest#11177 · 1 reaction · Opened Sep 8, 2026
Browser Mode (headed): UI split-pane handle overlaps the scaled test iframe and swallows Playwright clicks on elements at the top-left corner Open

feat: browser p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

vitest-dev/vitest#11170 · Opened Sep 7, 2026
vmThreads: require() of an ES module returns namespace without __esModule (Node adds it) -> "_interopDefault(...).default is not a function" Open

Difficulty 4/5 3-5 days Newbie friendliness 74/100

vitest-dev/vitest#11161 · Opened Sep 6, 2026
EnvironmentTeardownError: Closing rpc while "onUserConsoleLog" was pending — intermittent on v4/v5, clean on v3, maxWorkers:1 does not help Open

p3-minor-bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vitest-dev/vitest#11153 · 3 comments · 1 reaction · Opened Sep 4, 2026
Under `isolate: false`, a test file that declares no `vi.mock` receives another file's mock, and can't opt out Open

pending triage

Difficulty 4/5 3-5 days Newbie friendliness 55/100

vitest-dev/vitest#11152 · 3 comments · 2 reactions · Opened Sep 4, 2026
[5.0] `--project` filter does not match in benchmark mode, due to new project suffix Open

pending triage

Difficulty 3/5 1-2 days Newbie friendliness 68/100

vitest-dev/vitest#11149 · 1 comment · Opened Sep 4, 2026
[5.0] `bench.compare` no longer shows relative scores Open

feat: benchmark p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

vitest-dev/vitest#11148 · 1 comment · 1 reaction · Opened Sep 4, 2026
[5.x] Add `bench.all` to group benchmarks without comparing them Open

enhancement: pending triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11147 · Opened Sep 4, 2026
TS 7: Property 'not' does not exist on type Assertion<void, T> Open

p3-minor-bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

vitest-dev/vitest#11144 · 1 comment · Opened Sep 4, 2026
Vitest incorrectly retries the `it.fails` tests Open

p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

vitest-dev/vitest#11068 · 5 comments · 2 reactions · Opened Aug 26, 2026
spyOn data properties Open

enhancement: pending triage

Difficulty 3/5 1-2 days Newbie friendliness 58/100

vitest-dev/vitest#11062 · Opened Aug 25, 2026
forceRerunTriggers never matches when the project path contains a dot-directory segment (picomatch dot:false on absolute paths) Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

vitest-dev/vitest#11054 · Opened Aug 24, 2026
Vitest v5: Support full bundle mode Open

p3-significant

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11052 · 1 comment · 1 reaction · Opened Aug 24, 2026
Support Trace View outside browser mode Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vitest-dev/vitest#11045 · Opened Aug 24, 2026
Navigate Explorer Tree with Keyboard Open

feat: ui

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#11024 · 1 comment · Opened Aug 21, 2026
Unhelpful startup error when nothing is passed to `--reporter` flag Open

pending triage

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

vitest-dev/vitest#11019 · 5 comments · Opened Aug 20, 2026
Support listing tests related to source files Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

vitest-dev/vitest#11016 · 1 reaction · Opened Aug 19, 2026
Browser mode keeps the pages of finished projects open until the end of the run Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

vitest-dev/vitest#10990 · 3 comments · 3 reactions · Opened Aug 18, 2026
Checking `expect.toBeCloseTo` uses absolute difference, there should be a `expect.toBeRelativelyCloseTo` for checking ratios are close to 1 Open

enhancement: pending triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#10957 · 1 comment · Opened Aug 14, 2026
The browser configuration must have a "name" property when using preview() with empty/omitted browser.instances Open

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

vitest-dev/vitest#10940 · Opened Aug 13, 2026
Browser mode: EPERM hang on Windows when dependencies produce many pre-bundled chunks Open

pending triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vitest-dev/vitest#10890 · Opened Aug 7, 2026
Browser mode: collect-only (`vitest list`) shares one page across test files, leaking `vi.mock` between them Open

pending triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

vitest-dev/vitest#10886 · Opened Aug 6, 2026
Use fakeTimers does not mock imports from `node:timers` or `node:timers/promises` Open

p3-minor-bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

vitest-dev/vitest#10871 · 6 comments · 1 reaction · Opened Aug 4, 2026
Custom commands shifts arguments when any value is `undefined` Open

feat: browser

Difficulty 3/5 1-2 days Newbie friendliness 66/100

vitest-dev/vitest#10864 · 5 comments · Opened Aug 3, 2026
forceRerunTriggers silently match nothing when the project path contains a dot-prefixed segment Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

vitest-dev/vitest#10835 · 2 comments · Opened Jul 27, 2026

vitest-dev/vitest

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