v5.55.0

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• 52ebd28f58 feat(clients): release Agent Studio package updates (#​6573) by @​Fluf22

v5.54.1

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• 3a0bad1d01 fix(javascript): use proper null check instead of truthiness for required params (#​6498) by @​Fluf22

v5.54.0

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• e6753bc802 chore(deps): dependencies 2026-06-01 (#​6476) by @​algolia-bot
• 7f2ce8cd3a feat(clients): Agent Studio v1 (#​6097) by @​Fluf22

v4.1.7

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June 14, 2026

• Fix normalization of hue to [0, 360] range when hue is not finite

v4.1.6

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June 14, 2026

• Fix normalization of hue to [0, 360] range when hue is a negative number

v4.1.5

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June 14, 2026

• Fix handling of hue in interpolation when both parts have a missing hue component

v4.1.4

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June 13, 2026

• Fix none alpha in alpha()

v4.1.3

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June 10, 2026

• Assign rgb color notation to contrast-color() (instead of srgb).

v0.28.1

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• Disallow \ in local development server HTTP requests (GHSA-g7r4-m6w7-qqqr)

  This release fixes a security issue where HTTP requests to esbuild's local development server could traverse outside of the serve directory on Windows using a \ backslash character. It happened due to the use of Go's path.Clean() function, which only handles Unix-style / characters. HTTP requests with paths containing \ are no longer allowed.

  Thanks to @​dellalibera for reporting this issue.

• Add integrity checks to the Deno API (GHSA-gv7w-rqvm-qjhr)

  The previous release of esbuild added integrity checks to esbuild's npm install script. This release also adds integrity checks to esbuild's Deno install script. Now esbuild's Deno API will also fail with an error if the downloaded esbuild binary contains something other than the expected content.

  Note that esbuild's Deno API installs from registry.npmjs.org by default, but allows the NPM_CONFIG_REGISTRY environment variable to override this with a custom package registry. This change means that the esbuild executable served by NPM_CONFIG_REGISTRY must now match the expected content.

  Thanks to @​sondt99 for reporting this issue.

• Avoid inlining using and await using declarations (#​4482)

  Previously esbuild's minifier sometimes incorrectly inlined using and await using declarations into subsequent uses of that declaration, which then fails to dispose of the resource correctly. This bug happened because inlining was done for let and const declarations by avoiding doing it for var declarations, which no longer worked when more declaration types were added. Here's an example:

  // Original code
  {
    using x = new Resource()
    x.activate()
  }
  
  // Old output (with --minify)
  new Resource().activate();
  
  // New output (with --minify)
  {using e=new Resource;e.activate()}

• Fix module evaluation when an error is thrown (#​4461, #​4467)

  If an error is thrown during module evaluation, esbuild previously didn't preserve the state of the module for subsequent module references. This was observable if import() or require() is used to import a module multiple times. The thrown error is supposed to be thrown by every call to import() or require(), not just the first. With this release, esbuild will now throw the same error every time you call import() or require() on a module that throws during its evaluation.

• Fix some edge cases around the new operator (#​4477)

  Previously esbuild incorrectly printed certain edge cases involving complex expressions inside the target of a new expression (specifically an optional chain and/or a tagged template literal). The generated code for the new target was not correctly wrapped with parentheses, and either contained a syntax error or had different semantics. These edge cases have been fixed so that they now correctly wrap the new target in parentheses. Here is an example of some affected code:

  // Original code
  new (foo()`bar`)()
  new (foo()?.bar)()
  
  // Old output
  new foo()`bar`();
  new (foo())?.bar();
  
  // New output
  new (foo())`bar`();
  new (foo()?.bar)();

• Fix renaming of nested var declarations (#​4471)

  This release fixes a bug where var declarations in nested scopes that are hoisted up to module scope were not correctly being renamed during bundling. That could previously lead to name collisions when minification was disabled, which could potentially cause a behavior change. The bug has been fixed so that these hoisted declarations are now considered to be module-level symbols during the name collision avoidance pass.

• Emit var instead of const for certain TypeScript-only constructs for ES5 (#​4448)

  While esbuild doesn't generally support converting const to var for ES5 due to nested scoping rules (which is currently a build-time error), esbuild previously incorrectly converted TypeScript-only import assignment constructs into a const declaration even when targeting ES5. With this release, esbuild will now use var for this case instead:

  // Original code
  import x = require('y')
  
  // Old output (with --target=es5)
  const x = require("y");
  
  // New output (with --target=es5)
  var x = require("y");

v1.61.0

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🔑 WebAuthn passkeys

New Credentials virtual authenticator, available via browserContext.credentials, lets tests register passkeys and answer navigator.credentials.create() / navigator.credentials.get() ceremonies in the page — no real hardware key required, works in all browsers:

const context = await browser.newContext();

// Seed a passkey your backend provisioned for a test user.
await context.credentials.create('example.com', {
  id: credentialId,
  userHandle,
  privateKey,
  publicKey,
});
await context.credentials.install();

const page = await context.newPage();
await page.goto('https://example.com/login');
// The page's navigator.credentials.get() is answered with the seeded passkey.

You can also let the app register a passkey once in a setup test, read it back with credentials.get(), and seed it into later tests — see Credentials for details.

🗃️ Web Storage

New WebStorage API, available via page.localStorage and page.sessionStorage, reads and writes the page's storage for the current origin:

await page.localStorage.setItem('token', 'abc');
const token = await page.localStorage.getItem('token');
const items = await page.sessionStorage.items();

New APIs

Network

• apiResponse.securityDetails() and apiResponse.serverAddr() mirror the browser-side response.securityDetails() and response.serverAddr().

Browser and Screencast

• New option artifactsDir in browserType.connectOverCDP() controls where artifacts such as traces and downloads are stored when attached to an existing browser.
• New option cursor in screencast.showActions() controls the cursor decoration rendered for pointer actions.
• The onFrame callback in screencast.start() now receives a timestamp of when the frame was presented by the browser.

Test runner

• The testOptions.video option now supports the same set of modes as trace: new 'on-all-retries', 'retain-on-first-failure' and 'retain-on-failure-and-retries' values. See the video modes table for which runs are recorded and kept in each mode.
• Supported expect.soft.poll(...).
• New fullConfig.argv — a snapshot of process.argv from the runner process, handy for reading custom arguments passed after the -- separator.
• New fullConfig.failOnFlakyTests mirrors the config option, so reporters can explain why a flaky run failed.
• testInfo.errors now lists each sub-error of an AggregateError as a separate entry.
• New -G command line shorthand for --grep-invert.

🛠️ Other improvements

• Playwright now supports Ubuntu 26.04.
• HAR and trace recordings now include WebSocket requests.

Browser Versions

• Chromium 149.0.7827.55
• Mozilla Firefox 151.0
• WebKit 26.5

This version was also tested against the following stable channels:

• Google Chrome 149
• Microsoft Edge 149

v4.62.0

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2026-06-13

Features

• Ensure that shared dependencies between manual chunks and entry points receive a serparate chunk (#​6374)

Pull Requests

• #​6374: Extract the static dependencies imported by manual chunks into separate chunks (@​TrickyPi, @​lukastaegert)
• #​6405: fix(deps): update minor/patch updates (@​renovate[bot])
• #​6406: chore(deps): pin dependency concurrently to v9 (@​renovate[bot], @​lukastaegert)
• #​6407: chore(deps): lock file maintenance minor/patch updates (@​renovate[bot])
• #​6409: chore(deps): update minor/patch updates to v6.2.0 (@​renovate[bot])
• #​6410: chore(deps): lock file maintenance minor/patch updates (@​renovate[bot])
• #​6412: fix(deps): update minor/patch updates (@​renovate[bot])
• #​6413: chore(deps): update dependency eslint-plugin-unicorn to v65 (@​renovate[bot])
• #​6414: chore(deps): lock file maintenance minor/patch updates (@​renovate[bot], @​lukastaegert)