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🐞 Bug Fixes

Fix browser mode default testTimeout back to 15 seconds - by @hi-ogawa in #9167 (da0ad)
Avoid crashing on process.versions stub - by @AriPerkkio in #9174 (78cfb)
Reject calling suite function inside test - by @hi-ogawa in #9198 (1a259)
Allow inlining fully dynamic import - by @hi-ogawa in #9137 (56851)
Fix module graph UI on html reporter with headless browser mode - by @hi-ogawa in #9219 (60642)
Log deprecated test.poolOptions if it's set - by @sheremet-va in #9226 (f7f6a)
browser:
- Import recordArtifact from the vitest package - by @macarie in #9186 (01c56)
- Fix import.meta.env define - by @hi-ogawa in #9205 (01a9a)
- String formatting bug when including placeholders in console.log - by @michael-debs and @hi-ogawa in #9030 and #9131 (84a30)
coverage:
- Istanbul untested files source maps are off - by @AriPerkkio in #9208 (372e8)
experimental:
- Export setupEnvironment for custom pools - by @AriPerkkio in #9187 (5d26b)

View changes on GitHub

`v4.0.15`

🚀 Experimental Features

cache: Add opt-out on a plugin level, fix internal root cache - by @sheremet-va in #9154 (a68f7)
reporters: Print import duration breakdown - by @sheremet-va in #9105 (122ff)

🐞 Bug Fixes

Keep built-in id as is in bun and deno - by @sheremet-va in #9117 (075ab)
Use optimizeDeps.rolldownOptions to fix depreated warning + fix ssr.external: true - by @hi-ogawa in #9121 (fd8bd)
Fix external behavior with deps.optimizer - by @hi-ogawa in #9125 (4c754)
Very minor typo in "Chrome DevTools Protocol" - by @HowToTestFrontend in #9146 (20997)
browser: Run toMatchScreenshot only once when used with expect.element - by @macarie in #9132 (0d2e7)
coverage: Istanbul provider to not break source maps - by @AriPerkkio in #9040 (e4ca9)
deps: Update dependency tinyexec to v1 - in #9122 (fd786)
docs: Remove --browser.provider from docs - by @sheremet-va in #9115 (120b3)
expect: Preserve currentTestName in extended matchers - by @macarie in #9106 (e4345)
pool: Terminate workers on CTRL+c forceful exits - by @AriPerkkio in #9140 (d57d8)
reporters: Show project in github reporter - by @sheremet-va in #9138 (bb65e)
spy: Do not mock overriden method, if parent was automocked - by @sheremet-va in #9116 (1a246)
web-worker: MessagePort objects passed to Worker.postMessage work when clone === "native" - by @whitphx in #9118 (deee8)

View changes on GitHub

`v4.0.14`

🚀 Experimental Features

browser: Expose utils.configurePrettyDOM - by @sheremet-va in #9103 (2cc34)
runner: Add full names to tasks - by @macarie in #9087 (821aa)
ui: Add tabbed failure view for toMatchScreenshot with comparison slider - by @macarie in #8813 (c37c2)

🐞 Bug Fixes

Externalize before caching - by @sheremet-va in #9077 (e1b2e)
Collect the duration of external imports - by @sheremet-va in #9097 (3326c)
Rename collect to import, remove prepare - by @sheremet-va in #9091 (1256b)
browser:
- Unsubscribe onCancel on rpc destroy - by @AriPerkkio in #9088 (f5b72)
- Revert the viewport scaling in non-ui mode #9018 - by @sheremet-va in #9072 and #9018 (64502)
coverage:
- Invalidate circular modules correctly on rerun with coverage - by @aicest in #9096 (6f22c)
expect:
- Allow function as standard schema - by @hi-ogawa in #9099 (ed8a2)
jsdom:
- Reuse abort signals if possible - by @sheremet-va in #9090 (2c468)
pool:
- Init VITEST_POOL_ID + VITEST_WORKER_ID before environment setup - by @AriPerkkio in #9085 (37918)
web-worker:
- postMessage to send ports to workers - by @whitphx and @AriPerkkio in #9078 (9d176)

🏎 Performance

Replace debug with obug - by @sxzz and @AriPerkkio in #9057 (acc51)

View changes on GitHub

`v4.0.13`

🐞 Bug Fixes

types:
- Don't use type from Vite 7.1 - by @sheremet-va in #9071 (6356b)
- Don't import node.js dependent types in vitest/browser - by @sheremet-va in #9068 (332af)

🏎 Performance

Avoid fetchModule roundtrip if the module is cached - by @sheremet-va in #9075 (b27e0)
experimental: If fsCacheModule is enabled, read from the memory when possible - by @sheremet-va in #9076 (6b9a1)

View changes on GitHub

`v4.0.12`

🐞 Bug Fixes

Inherit fsModuleCachePath by default - by @sheremet-va in #9063 (9a8bc)
Don't import from @opentelemetry/api in public types - by @sheremet-va in #9066 (e944a)

View changes on GitHub

`v4.0.11`

🚀 Experimental Features

api: Add extensible test artifact API - by @macarie in #8987 (77292)
- See more at https://vitest.dev/api/advanced/artifacts
expect: Provide task in MatchState - by @macarie in #9022 (afd1f)
experimental: Support OpenTelemetry traces - by @sheremet-va in #8994 (d6d33)
- See more at https://vitest.dev/guide/open-telemetry

🏎 Performance

experimental: Add file system cache - by @sheremet-va in #9026 (1b147)
- See more at https://vitest.dev/config/experimental#experimental-fsmodulecache

View changes on GitHub

`v4.0.10`

🐞 Bug Fixes

Remove onCancel when worker is terminated - by @sheremet-va in #9033 (6d7f0)
browser:
- Don't scale the iframe if UI is disabled - by @sheremet-va in #9018 (5406e)
- Handle dependency stack traces with external source maps. Resolves: #9003 - by @iclectic in #9016 and #9003 (57ae5)
bun:
- Parsing of stack trace for bun runtime - by @nazarhussain in #9032 (f3ec6)
core:
- Prevent starting new run when cancelling - by @AriPerkkio in #8991 (eb98d)
pool:
- Prevent writing to closed worker - by @AriPerkkio and @sheremet-va in #9023 (042c6)
reporters:
- Report correct test run duration at the end - by @sheremet-va in #8969 (bc3a6)
ui:
- Use execution time from ws reporter (onFinished) - by @userquin in #8975 (f56dc)

View changes on GitHub

`v4.0.9`

🚀 Experimental Features

expect: Add Set support to toBeOneOf - by @tim-we and @sheremet-va in #8906 (a415d)

🐞 Bug Fixes

browser: Add favicon icons to the browser mode ui - by @userquin in #8972 (353ee)
forks: Increase worker start timeout - by @AriPerkkio in #9027 (5e750)
jsdom: Cloned request is an instance of Request - by @sheremet-va in #8985 (506a9)
ui: Collect file/suite/test duration correctly - by @userquin in #8976 (8016d)

View changes on GitHub

evanw/esbuild (esbuild)

`v0.27.2`

Allow import path specifiers starting with #/ (#4361)

Previously the specification for package.json disallowed import path specifiers starting with #/, but this restriction has recently been relaxed and support for it is being added across the JavaScript ecosystem. One use case is using it for a wildcard pattern such as mapping #/* to ./src/* (previously you had to use another character such as #_* instead, which was more confusing). There is some more context in nodejs/node#49182.

This change was contributed by @hybrist.

Automatically add the -webkit-mask prefix (#4357, #4358)

This release automatically adds the -webkit- vendor prefix for the mask CSS shorthand property:

/* Original code */
main {
  mask: url(x.png) center/5rem no-repeat
}

/* Old output (with --target=chrome110) */
main {
  mask: url(x.png) center/5rem no-repeat;
}

/* New output (with --target=chrome110) */
main {
  -webkit-mask: url(x.png) center/5rem no-repeat;
  mask: url(x.png) center/5rem no-repeat;
}

This change was contributed by @BPJEnnova.

Additional minification of switch statements (#4176, #4359)

This release contains additional minification patterns for reducing switch statements. Here is an example:

// Original code
switch (x) {
  case 0:
    foo()
    break
  case 1:
  default:
    bar()
}

// Old output (with --minify)
switch(x){case 0:foo();break;case 1:default:bar()}

// New output (with --minify)
x===0?foo():bar();

Forbid using declarations inside switch clauses (#4323)

This is a rare change to remove something that was previously possible. The Explicit Resource Management proposal introduced using declarations. These were previously allowed inside case and default clauses in switch statements. This had well-defined semantics and was already widely implemented (by V8, SpiderMonkey, TypeScript, esbuild, and others). However, it was considered to be too confusing because of how scope works in switch statements, so it has been removed from the specification. This edge case will now be a syntax error. See tc39/proposal-explicit-resource-management#215 and rbuckton/ecma262#14 for details.

Here is an example of code that is no longer allowed:
```
switch (mode) {
  case 'read':
    using readLock = db.read()
    return readAll(readLock)

  case 'write':
    using writeLock = db.write()
    return writeAll(writeLock)
}
```
That code will now have to be modified to look like this instead (note the additional { and } block statements around each case body):
```
switch (mode) {
  case 'read': {
    using readLock = db.read()
    return readAll(readLock)
  }
  case 'write': {
    using writeLock = db.write()
    return writeAll(writeLock)
  }
}
```
This is not being released in one of esbuild's breaking change releases since this feature hasn't been finalized yet, and esbuild always tracks the current state of the specification (so esbuild's previous behavior was arguably incorrect).

`v0.27.1`

Fix bundler bug with var nested inside if (#4348)

This release fixes a bug with the bundler that happens when importing an ES module using require (which causes it to be wrapped) and there's a top-level var inside an if statement without being wrapped in a { ... } block (and a few other conditions). The bundling transform needed to hoist these var declarations outside of the lazy ES module wrapper for correctness. See the issue for details.
Fix minifier bug with for inside try inside label (#4351)

This fixes an old regression from version v0.21.4. Some code was introduced to move the label inside the try statement to address a problem with transforming labeled for await loops to avoid the await (the transformation involves converting the for await loop into a for loop and wrapping it in a try statement). However, it introduces problems for cross-compiled JVM code that uses all three of these features heavily. This release restricts this transform to only apply to for loops that esbuild itself generates internally as part of the for await transform. Here is an example of some affected code:
```
// Original code
d: {
  e: {
    try {
      while (1) { break d }
    } catch { break e; }
  }
}

// Old output (with --minify)
a:try{e:for(;;)break a}catch{break e}

// New output (with --minify)
a:e:try{for(;;)break a}catch{break e}
```

Inline IIFEs containing a single expression (#4354)

Previously inlining of IIFEs (immediately-invoked function expressions) only worked if the body contained a single return statement. Now it should also work if the body contains a single expression statement instead:

// Original code
const foo = () => {
  const cb = () => {
    console.log(x())
  }
  return cb()
}

// Old output (with --minify)
const foo=()=>(()=>{console.log(x())})();

// New output (with --minify)
const foo=()=>{console.log(x())};

The minifier now strips empty finally clauses (#4353)

This improvement means that finally clauses containing dead code can potentially cause the associated try statement to be removed from the output entirely in minified builds:

// Original code
function foo(callback) {
  if (DEBUG) stack.push(callback.name);
  try {
    callback();
  } finally {
    if (DEBUG) stack.pop();
  }
}

// Old output (with --minify --define:DEBUG=false)
function foo(a){try{a()}finally{}}

// New output (with --minify --define:DEBUG=false)
function foo(a){a()}

Allow tree-shaking of the Symbol constructor

With this release, calling Symbol is now considered to be side-effect free when the argument is known to be a primitive value. This means esbuild can now tree-shake module-level symbol variables:

// Original code
const a = Symbol('foo')
const b = Symbol(bar)

// Old output (with --tree-shaking=true)
const a = Symbol("foo");
const b = Symbol(bar);

// New output (with --tree-shaking=true)
const b = Symbol(bar);

eslint/eslint (eslint)

`v9.39.2`

mmkal/expect-type (expect-type)

`v1.3.0`

What's Changed

Update TypeScript to 5.9 and test against it by @charpeni in #166
Improve type error for failures on types with optional props by @mmkal in #160

Full Changelog: mmkal/expect-type@v1.2.2...v1.3.0

unjs/obuild (obuild)

`v0.4.9`

🏡 Chore

Update deps (afc4bff)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.8`

📖 Documentation

Add c12 to "currently used" section (#66)

🏡 Chore

Update deps (81d54e2)

🤖 CI

Bump actions checkout (#64)

❤️ Contributors

Pooya Parsa (@pi0)
Abeer0 (@iiio2)
David Abou (@davidabou)

`v0.4.7`

💅 Refactors

rolldown: Use dist/_chunks for chunks (c1c8877)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.6`

🚀 Enhancements

rolldown: Use dist/_libs for bundled dependencies (ec8c3fe)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.5`

🩹 Fixes

rolldown: Default platform to node (439b03a)

🏡 Chore

Update deps (3a9d8e6)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.4`

🏡 Chore

Update deps (75e8450)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.3`

🏡 Chore

Update oxc (6256796)

❤️ Contributors

Pooya Parsa (@pi0)

`v0.4.2`

🏡 Chore

Update oxc to 0.98 (14a7ab3)

❤️ Contributors

Pooya Parsa (@pi0)

pnpm/pnpm (pnpm)

Minor Changes

Added --lockfile-only option to pnpm list #10020.

Patch Changes

pnpm self-update should download pnpm from the configured npm registry #10205.
pnpm self-update should always install the non-executable pnpm package (pnpm in the registry) and never the @pnpm/exe package, when installing v11 or newer. We currently cannot ship @pnpm/exe as pkg doesn't work with ESM #10190.
Node.js runtime is not added to "dependencies" on pnpm add, if there's a engines.runtime setting declared in package.json #10209.
The installation should fail if an optional dependency cannot be installed due to a trust policy check failure #10208.
pnpm list and pnpm why now display npm: protocol for aliased packages (e.g., foo npm:is-odd@3.0.1) #8660.
Don't add an extra slash to the Node.js mirror URL #10204.
pnpm store prune should not fail if the store contains Node.js packages #10131.

Platinum Sponsors

Gold Sponsors

prettier/prettier (prettier)

`v3.7.4`

LWC: Avoid quote around interpolations (#18383 by @kovsu)

<!-- Input -->
<div foo={bar}>   </div>

<!-- Prettier 3.7.3 (--embedded-language-formatting off) -->
<div foo="{bar}"></div>

<!-- Prettier 3.7.4 (--embedded-language-formatting off) -->
<div foo={bar}></div>

TypeScript: Fix comment inside union type gets duplicated (#18393 by @fisker)

// Input
type Foo = (/** comment */ a | b) | c;

// Prettier 3.7.3
type Foo = /** comment */ (/** comment */ a | b) | c;

// Prettier 3.7.4
type Foo = /** comment */ (a | b) | c;

TypeScript: Fix unstable comment print in union type comments (#18395 by @fisker)

// Input
type X = (A | B) & (
  // comment
  A | B
);

// Prettier 3.7.3 (first format)
type X = (A | B) &
  (// comment
  A | B);

// Prettier 3.7.3 (second format)
type X = (
  | A
  | B // comment
) &
  (A | B);

// Prettier 3.7.4
type X = (A | B) &
  // comment
  (A | B);

`v3.7.3`

API: Fix `prettier.getFileInfo()` change that breaks VSCode extension (#18375 by @fisker)

An internal refactor accidentally broke the VSCode extension plugin loading.

`v3.7.2`

JavaScript: Fix string print when switching quotes (#18351 by @fisker)

// Input
console.log("A descriptor\\'s .kind must be \"method\" or \"field\".")

// Prettier 3.7.1
console.log('A descriptor\\'s .kind must be "method" or "field".');

// Prettier 3.7.2
console.log('A descriptor\\\'s .kind must be "method" or "field".');

JavaScript: Preserve quote for embedded HTML attribute values (#18352 by @kovsu)

// Input
const html = /* HTML */ ` <div class="${styles.banner}"></div> `;

// Prettier 3.7.1
const html = /* HTML */ ` <div class=${styles.banner}></div> `;

// Prettier 3.7.2
const html = /* HTML */ ` <div class="${styles.banner}"></div> `;

TypeScript: Fix comment in empty type literal (#18364 by @fisker)

// Input
export type XXX = {
  // tbd
};

// Prettier 3.7.1
export type XXX = { // tbd };

// Prettier 3.7.2
export type XXX = {
  // tbd
};

`v3.7.1`

API: Fix performance regression in doc printer (#18342 by @fisker)

Prettier 3.7.1 can be very slow when formatting big files, the regression has been fixed.

`v3.7.0`

🔗 Release Notes

vitejs/vite (vite)

`v7.3.0`

Please refer to CHANGELOG.md for details.

`v7.2.7`

`v7.2.6`

7.2.6 (2025-12-01)

`v7.2.4`

Bug Fixes

revert "perf(deps): replace debug with obug (#21107)" (2d66b7b)

`v7.2.3`