12.0.0-rc.1 (2026-06-20)

⚠ BREAKING CHANGES

• change root package.json type to module (#6078)

🌟 Features

• change root package.json type to module (#6078) (da015de)

📚 Documentation

• add blog (#6095) (c0280ba)
• switch util.inherits to class extends (#5677) (f6e8d9a)

🧹 Chores

• configure Release Please for RC (#6083) (8f3a61c)
• deps: update dependency @types/node to v24.13.0 (#6066) (fb1998a)
• deps: update dependency eslint-plugin-n to v18.1.0 (#6072) (6f56135)
• deps: update dependency knip to v6.16.1 (#6067) (b204395)
• deps: update dependency rollup to v4.61.0 (#6050) (87696d5)
• deps: update dependency rollup to v4.62.0 (#6103) (69e04bf)
• deps: update eslint monorepo to v10.5.0 (#6100) (ac372e0)
• explain "trivial changes", update PR template (#6075) (6cbe3d5)
• fix "remove 'waiting for author' " workflow (#6090) (b80d44b)
• fix formatting on new remove-waiting-label file (#6062) (bfcb02a)
• fix Release Please manifest (#6097) (cfd9cf7)
• remove "status: waiting for author" label on review request (#5983) (fa3488d)
• replace Karma with Playwright for browser tests (#6031) (7c9b004)
• restore cursor in watch failure diagnostics (#6102) (d640269)
• synchronize watch integration tests on observed runs instead of sleeps (#6058) (84af186)
• upgrade Astro and its deps (#6089) (66cdd8f)
• use 1st-party script for blocked-pr.yml (#6085) (54aee06)

🤖 Automation

• deps: bump codecov/codecov-action from 6 to 7 in the github-actions group (#6051) (00db758)

11.7.7 (2026-06-13)

🩹 Fixes

• surface ts-node compile errors (#6045) (3477563)

12.0.0-beta-9.6 (2026-06-10)

🩹 Fixes

• require serializer.mjs in parallel worker pool files (#6055) (ffdf37c)
• surface global setup/teardown errors with a non-zero exit code (#5994) (ad81ec6)

📚 Documentation

• clarify supported mocha version for ESM configuration (#6027) (5921837)
• fix inconsistencies in docs (#6000) (6310d0e)
• include the released version in the npm badge alt text (#5959) (de924ba)
• modernize spies example, drop should.js (#6016) (3b321a3)

🧹 Chores

• add "descriptions" item to "AI-generated code" (#6041) (efe6167)
• deps: update dependency js-yaml to v4.2.0 (#6047) (8df3ba6)
• deps: update dependency knip to v6.15.0 (#6043) (0c03d7d)
• rollback devDep npm-run-all2 to v8 for Node 20 (#6040) (d7d095b)

🤖 Automation

• deps: bump astro from 6.1.9 to 6.4.4 in /docs (#6046) (f47bcf5)

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)

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)

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

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)

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

🧹 Chores

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

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)

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

🧹 Chores

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