v12.0.0-beta-9.5

12.0.0-beta-9.5 (2026-06-03)

⚠ BREAKING CHANGES

• remove bin/_mocha and convert bin/ and entry points to ESM (#6017)

🌟 Features

• remove bin/_mocha and convert bin/ and entry points to ESM (#6017) (930972a)

🩹 Fixes

• lookupFiles() now returns string[] for direct file paths (#5941) (4718476), closes #5940
• prevent diff hang on large/complex objects (#5898) (6695fba)

🧹 Chores

• convert lib/nodejs/ utility files to ESM (#6011) (a8ffaa9)
• convert lib/reporters/base to ESM (#6012) (d12dd90)
• deps: update dependency eslint to v10.4.0 (#5996) (f2dd26b)
• deps: update dependency knip to v6.14.2 (#5982) (b40e85b)
• deps: update dependency npm-run-all2 to v9 (#6019) (70bea83)
• deps: update dependency webpack to v5.107.2 (#6022) (5eca67d)

🤖 Automation

• deps: bump joelwmale/webhook-action in the github-actions group (#6032) (75c618d)

v11.7.6

11.7.6 (2026-02-14)

🩹 Fixes

• make describe().timeout() work (aafe6fd)
• test: replace wmic usage with native Windows API (#5694) (73ebdfa)

🧹 Chores

• format all code (#5629) (0696784)
• remove Netlify (#5630) (8d01d33)

v12.0.0-beta-9.4

12.0.0-beta-9.4 (2026-05-16)

⚠ BREAKING CHANGES

• remove unused legacy errors.js functions (#5835)

🩹 Fixes

• deps: update dependency @astrojs/starlight to ^0.39.0 (#5952) (eed10ac)

📚 Documentation

• add TypeScript setup guide (#5863) (af63dcf)
• fix correctness issues in error codes, CLI defaults, and config docs (#5860) (bd54205)
• modernize DEVELOPMENT.md for new contributors (#5865) (5122ad7)

🧹 Chores

• convert lib/cli/cli.mjs to ESM (#5909) (6e91a89)
• convert dot, min, and list reporters to esm (#5907) (b19b696)
• convert run-option-metadata and exports interface to ESM (#5910) (27b0814)
• deps: update dependency @types/node to v24 (#5958) (ef113d7)
• deps: update dependency eslint to v10.3.0 (#5945) (18cf178)
• deps: update dependency eslint-plugin-n to v18 (#5948) (99f0e4a)
• deps: update dependency globals to v17.6.0 (#5946) (412070c)
• deps: update dependency knip to v6.12.1 (#5942) (e29003d)
• deps: update dependency knip to v6.6.1 (#5927) (7c48496)
• deps: update dependency knip to v6.7.0 (#5933) (441c32a)
• deps: update dependency nyc to v18 (#5846) (1fea247)
• deps: update dependency semver to v7.8.0 (#5957) (0cbb43c)
• deps: update dependency sinon to v22 (#5949) (54dcfda)
• deps: update dependency webpack-cli to v7 (#5871) (9d367e1)
• deps: update googleapis/release-please-action action to v5 (#5929) (f32085f)
• dev-deps: upgrade webpack from v6 to v7 + remove obsolete fail-on-errors-webpack-plugin (#5908) (103ad41)
• document CJS and MJS config file priority (#5923) (09a1106)
• fix Knip issues (#5919) (1b3d604)
• migrate core interfaces and utilities to ESM (#5930) (1ad23ab)
• migrate reporters to ESM (#5928) (f6a62ca)
• remove unused legacy errors.js functions (#5835) (4116368)
• tag alpha releases as alpha, not next (#5951) (8e29413), closes #5947

v12.0.0-alpha-issue-5899.4

12.0.0-alpha-issue-5899.4 (2026-05-02)

🧹 Chores

• convert cli.mjs back to CJS (da799d2)
• stop modifying module.paths in cli.js (e2f47a9)

v12.0.0-alpha-issue-5899.3

12.0.0-alpha-issue-5899.3 (2026-05-02)

🧹 Chores

• convert cli.js to ESM (#5909) (8955ac2)

v12.0.0-alpha-issue-5899.2

12.0.0-alpha-issue-5899.2 (2026-05-02)

🧹 Chores

• add debug logs to cli.js module.paths logic (1bbcca3)
• bump release-please publish node-version to 24 (f5c1556)

v12.0.0-alpha-issue-5899.1

12.0.0-alpha-issue-5899.1 (2026-05-02)

🧹 Chores

• set alpha-issue-5899 baseline (17c2908)

v12.0.0-beta-9.3

12.0.0-beta-9.3 (2026-04-28)

🩹 Fixes

• begin running tests immediately instead of waiting for watcher, reload required files in watch mode (#5409) (7d9ade6)
• deps: update dependency diff to v9 (#5917) (fbd831e)
• support file: URLs in loadFilesAsync (#5833) (f9f9436), closes #4993
• support modern RegExp flags in Mocha#grep (#5825) (35413b6)

📚 Documentation

• agent instructions to help review agents (#5839) (badac5b)
• clarify --delay option behavior (#5862) (0b88137)
• clarify that parallel mode does not provide test isolation (#5864) (274c3d2)
• document parent directory lookup for config files (#5861) (e7a98ef)
• fix various typos in source and documentation (#5834) (e15bbda)
• modernize code examples (#5687) (9c4966a)

🧹 Chores

• add transient error note to Release Please workflow (#5847) (7288278)
• convert commands, init, and lookup-files to ESM (#5891) (46d09d1)
• convert context, hook, and stats-collector to ESM (#5853) (5ac4070)
• convert highlight-tags and parse-query to ESM (#5855) (aad7997)
• convert node-flags and options to ESM, fix ESLint issue (#5900) (cd2e461)
• deps: update dependency @eslint/markdown to v8 (#5845) (bd05089)
• deps: update dependency eslint to v10.2.0 (#5884) (2829fe3)
• deps: update dependency globals to v17.5.0 (#5914) (96eaa7c)
• deps: update dependency knip to v6.3.1 (#5892) (a2675f1)
• deps: update dependency knip to v6.4.0 (#5901) (17ce208)
• deps: update dependency knip to v6.5.0 (#5916) (34465f6)
• deps: update dependency unexpected-sinon to v11 (#5737) (e652121)
• deps: update dependency webpack to v5.106.1 (#5893) (db85960)
• fix format workflow permissions for npm-script.yml (#5903) (88a9806)
• fix formatting in lib/cli/lookup-files.mjs (#5912) (a3c3a1c)
• fix line numbers in stack traces (#5664) (f49aca5)
• format AGENTS.md (#5852) (16497f2)
• inline escape-string-regexp (single-regex utility) (#5883) (25e6538)
• migrate 5 unit test files from unexpected to chai (#5896) (fa06dde)
• migrate lib/pending and lib/error-constants to ESM (#5767) (5aacbce)
• upgrade site to Astro 6 (#5913) (1afd6c7)

v12.0.0-beta-9.2

12.0.0-beta-9.2 (2026-04-03)

Note that beta-9.1 is identical to beta-10. See #5763 for details. Future v12 betas (if there are any) will continue the beta-9.x naming.

🩹 Fixes

• deps: update dependency workerpool to v10 (#5751) (96a4768)
• use semver dot separator for beta pre-release versions (beta-X → beta.X) (#5764) (5574738)

📚 Documentation

• add "failing workaround" and new dash to sec-vuln-reports.mdx (#5783) (f9e553e)
• add FAQ explainer for dependency security vulnerability reports (#5691) (2517693)
• add FAQ section to CONTRIBUTING.md for "can I work on this?" (#5689) (682c307)
• add major release strategy, fix typos (#5551) (ec0fe0d)
• cleanup third party UI code examples for issue 5570 (#5784) (8d86811)
• document AI-generated code policies (#5693) (3533316)
• document many "external" services (#5685) (30f8fe6)
• fix typo in configuring.mdx (#5699) (fdf1a11)
• Updates COC Policy To Match OpenJS Guidelines (#5802) (9029f66)

🧹 Chores

• add Knip to docs-next, remove unused deps, and cleanup links (#5726) (a3908e9)
• add link from bug template to security explainer (#5782) (ab8fc25)
• add workflow to handle stale items (#5831) (dd08f6f)
• add workflow_dispatch to all workflows (#5793) (cca0a2c)
• deps: update actions/stale action to v10 (#5842) (e75b14f)
• deps: update dependency astro to v5.18.1 (#5786) (bf99e30)
• deps: update dependency chai to v6 (#5720) (2e07be1)
• deps: update dependency eslint to v10.1.0 (#5827) (2c8eeb0)
• deps: update dependency eslint-plugin-n to v17.24.0 (#5798) (bb66555)
• deps: update dependency globals to v17 (#5722) (acf9357)
• deps: update dependency installed-check to v10 (#5738) (5905ed9)
• deps: update dependency knip to v5.88.0 (#5799) (40ec9b8)
• deps: update dependency knip to v6 (#5828) (661f349)
• deps: update dependency rollup to v4.59.0 (#5813) (1ef2020)
• deps: update dependency rollup to v4.60.0 (#5829) (4ab5813)
• deps: update eslint monorepo to v10 (major) (#5742) (fe9dc01)
• deps: update joelwmale/webhook-action digest to 6cebc9d (#5702) (e61c8d5)
• docs: rename docs-next to docs (#5770) (39c15a8)
• fix supporters file extension in knip config (#5796) (53ca72f)
• have Tests workflow ignore more relevant paths (#5762) (8e2cebe)
• remove global.setImmediate fallback (#5836) (5e69d16)
• remove repeat() polyfill (#5837) (f988a80)
• remove now-unused utils.inherits (#5766) (d0a636b)
• remove unused libc props from package-lock.json (#5817) (b0a89ce)
• remove unused fossaignore (#5769) (8a0eaf7)
• run tests when PR is retargeted (#5761) (3481b1e)
• switch reporters from util.inherits to ES2015 classes (#5180) (c3f32ce)
• switch Runnable, Hook, and Test from util.inherits to ES2015 classes (#5178) (1378fd8)
• use beta-9.1 instead of beta.10 (#5821) (bc1eff2)

🤖 Automation

• deps: bump codecov/codecov-action in the github-actions group (#5832) (525b50a)
• deps: bump OctoGuide/bot in the github-actions group (#5791) (fb6bfd6)

v12.0.0-beta-10

12.0.0-beta-10 (2026-02-21)

🌟 Features

• remove Sauce Labs (#5700) (625c34e)

🩹 Fixes

• change Pending to properly extend Error (#5679) (158effd)
• deps: update dependency chokidar to v5 (#5734) (ff2f17f)
• deps: update dependency minimatch to v10 (#5743) (3f3e449)
• deps: update dependency starlight-package-managers to ^0.12.0 (#5717) (aa4ba48)

📚 Documentation

• fix client redirects (#5697) (dd9145d), closes #5696

🧹 Chores

• Configure Renovate (#5678) (a9c9b90)
• deps: update dependency @rollup/plugin-alias to v6 (#5718) (267d751)
• deps: update dependency @rollup/plugin-commonjs to v29 (#5719) (9ed4ee5)
• deps: update dependency astro to v5.17.1 (#5703) (ec3d1fa)
• deps: update dependency chai to v4.5.0 (#5705) (870f9f8)
• deps: update dependency cross-env to v10 (#5721) (20b7476)
• deps: update dependency knip to v5.83.1 (#5708) (d833413)
• deps: update dependency npm-run-all2 to v8 (#5727) (e38e0ec)
• deps: update dependency prettier to v3.8.1 (#5709) (2f98cfd)
• deps: update dependency rimraf to v6 (#5728) (ba124e9)
• deps: update dependency rollup to v4.57.1 (#5710) (178749d)
• deps: update dependency unexpected-map to v3 (#5736) (c1f3379)
• deps: update dependency unist-util-visit to v5.1.0 (#5711) (7ede894)
• deps: update dependency webdriverio to v9 (#5739) (ff334df)
• deps: update dependency webpack-cli to v6 (#5741) (95c9d75)
• deps: update dependency workerpool to v9.3.4 (#5715) (c030a3b)
• deps: update remark (#5745) (37a25f1)
• fix timeout issue with some XUnit tests (53cc467)
• switch Suite from util.inherits to ES2015 classes (#5179) (1ce690e)

🤖 Automation

• deps: bump OctoGuide/bot in the github-actions group (#5724) (87224d8)
• run npm audit fix (#5695) (c7b00b0)