Sourced from eslint's releases.

v9.28.0

Features

• b0674be feat: Customization of serialization for languageOptions (#19760) (Nicholas C. Zakas)
• a95721f feat: Add --pass-on-unpruned-suppressions CLI option (#19773) (Milos Djermanovic)
• bfd0e7a feat: support TypeScript syntax in no-use-before-define (#19566) (Tanuj Kanti)
• 68c61c0 feat: support TS syntax in no-shadow (#19565) (Nitin Kumar)
• 0f773ef feat: support TS syntax in no-magic-numbers (#19561) (Nitin Kumar)
• c4a6b60 feat: add allowTypeAnnotation to func-style (#19754) (sethamus)
• b03ad17 feat: add TypeScript support to prefer-arrow-callback (#19678) (Tanuj Kanti)
• bc3c331 feat: ignore overloaded function declarations in func-style rule (#19755) (sethamus)

Bug Fixes

• eea3e7e fix: Remove configured global variables from GlobalScope#implicit (#19779) (Milos Djermanovic)
• a467de3 fix: update context.report types (#19751) (Nitin Kumar)
• fd467bb fix: remove interopDefault to use jiti's default (#19697) (sethamus)
• 72d16e3 fix: avoid false positive in no-unassigned-vars for declare module (#19746) (Azat S.)
• 81c3c93 fix: curly types (#19750) (Eli)

Documentation

• 3ec2082 docs: Nested arrays in files config entry (#19799) (Nicholas C. Zakas)
• 89a65b0 docs: clarify how config arrays can apply to subsets of files (#19788) (Shais Ch)
• 2ba8a0d docs: Add description of meta.namespace to plugin docs (#19798) (Nicholas C. Zakas)
• 59dd7e6 docs: update func-style with examples (#19793) (Tanuj Kanti)
• e9129e0 docs: add global scope's implicit field to Scope Manager docs (#19770) (Milos Djermanovic)
• 52f5b7a docs: fix minor typos and add links (#19743) (루밀LuMir)
• 00716a3 docs: upfront recommend against using the no-return-await rule (#19727) (Mike DiDomizio)

Chores

• 175b7b8 chore: upgrade to @eslint/js@9.28.0 (#19802) (Francesco Trotta)
• 844f5a6 chore: package.json update for @​eslint/js release (Jenkins)
• 62b1c1b chore: update globals to v16 (#19791) (Nitin Kumar)
• e8a1cb8 chore: ignore jiti-v2.0 & jiti-v2.1 for renovate (#19786) (Nitin Kumar)
• 43d3975 chore: Add Copilot Instructions file (#19753) (Nicholas C. Zakas)
• 2dfb5eb test: update SourceCodeTraverser tests (#19763) (Milos Djermanovic)
• 5bc21f9 chore: add *.code-workspace to .gitignore (#19771) (루밀LuMir)
• f4fa40e refactor: NodeEventGenerator -> SourceCodeTraverser (#19679) (Nicholas C. Zakas)
• 0f49329 refactor: use a service to emit warnings (#19725) (Francesco Trotta)
• 20a9e59 chore: update dependency shelljs to ^0.10.0 (#19740) (renovate[bot])

v9.27.0

Features

• d71e37f feat: Allow flags to be set in ESLINT_FLAGS env variable (#19717) (Nicholas C. Zakas)
• ba456e0 feat: Externalize MCP server (#19699) (Nicholas C. Zakas)
• 07c1a7e feat: add allowRegexCharacters to no-useless-escape (#19705) (sethamus)
• 7bc6c71 feat: add no-unassigned-vars rule (#19618) (Jacob Bandes-Storch)
• ee40364 feat: convert no-array-constructor suggestions to autofixes (#19621) (sethamus)
• 32957cd feat: support TS syntax in max-params (#19557) (Nitin Kumar)

Bug Fixes

• 5687ce7 fix: correct mismatched removed rules (#19734) (루밀LuMir)

... (truncated)

Sourced from eslint's changelog.

v9.28.0 - May 30, 2025

• 175b7b8 chore: upgrade to @eslint/js@9.28.0 (#19802) (Francesco Trotta)
• 844f5a6 chore: package.json update for @​eslint/js release (Jenkins)
• b0674be feat: Customization of serialization for languageOptions (#19760) (Nicholas C. Zakas)
• 3ec2082 docs: Nested arrays in files config entry (#19799) (Nicholas C. Zakas)
• 89a65b0 docs: clarify how config arrays can apply to subsets of files (#19788) (Shais Ch)
• 2ba8a0d docs: Add description of meta.namespace to plugin docs (#19798) (Nicholas C. Zakas)
• eea3e7e fix: Remove configured global variables from GlobalScope#implicit (#19779) (Milos Djermanovic)
• a95721f feat: Add --pass-on-unpruned-suppressions CLI option (#19773) (Milos Djermanovic)
• a467de3 fix: update context.report types (#19751) (Nitin Kumar)
• 59dd7e6 docs: update func-style with examples (#19793) (Tanuj Kanti)
• 62b1c1b chore: update globals to v16 (#19791) (Nitin Kumar)
• bfd0e7a feat: support TypeScript syntax in no-use-before-define (#19566) (Tanuj Kanti)
• 68c61c0 feat: support TS syntax in no-shadow (#19565) (Nitin Kumar)
• e8a1cb8 chore: ignore jiti-v2.0 & jiti-v2.1 for renovate (#19786) (Nitin Kumar)
• 0f773ef feat: support TS syntax in no-magic-numbers (#19561) (Nitin Kumar)
• 43d3975 chore: Add Copilot Instructions file (#19753) (Nicholas C. Zakas)
• c4a6b60 feat: add allowTypeAnnotation to func-style (#19754) (sethamus)
• fd467bb fix: remove interopDefault to use jiti's default (#19697) (sethamus)
• 2dfb5eb test: update SourceCodeTraverser tests (#19763) (Milos Djermanovic)
• b03ad17 feat: add TypeScript support to prefer-arrow-callback (#19678) (Tanuj Kanti)
• e9129e0 docs: add global scope's implicit field to Scope Manager docs (#19770) (Milos Djermanovic)
• bc3c331 feat: ignore overloaded function declarations in func-style rule (#19755) (sethamus)
• 5bc21f9 chore: add *.code-workspace to .gitignore (#19771) (루밀LuMir)
• 72d16e3 fix: avoid false positive in no-unassigned-vars for declare module (#19746) (Azat S.)
• f4fa40e refactor: NodeEventGenerator -> SourceCodeTraverser (#19679) (Nicholas C. Zakas)
• 81c3c93 fix: curly types (#19750) (Eli)
• 52f5b7a docs: fix minor typos and add links (#19743) (루밀LuMir)
• 0f49329 refactor: use a service to emit warnings (#19725) (Francesco Trotta)
• 20a9e59 chore: update dependency shelljs to ^0.10.0 (#19740) (renovate[bot])
• 00716a3 docs: upfront recommend against using the no-return-await rule (#19727) (Mike DiDomizio)

v9.27.0 - May 16, 2025

• f8f1560 chore: upgrade @​eslint/js@​9.27.0 (#19739) (Milos Djermanovic)
• ecaef73 chore: package.json update for @​eslint/js release (Jenkins)
• 25de550 docs: Update description of frozen rules to mention TypeScript (#19736) (Nicholas C. Zakas)
• bd5def6 docs: Clean up configuration files docs (#19735) (Nicholas C. Zakas)
• d71e37f feat: Allow flags to be set in ESLINT_FLAGS env variable (#19717) (Nicholas C. Zakas)
• 5687ce7 fix: correct mismatched removed rules (#19734) (루밀LuMir)
• 596fdc6 chore: update dependency @​arethetypeswrong/cli to ^0.18.0 (#19732) (renovate[bot])
• ba456e0 feat: Externalize MCP server (#19699) (Nicholas C. Zakas)
• dc5ed33 fix: correct types and tighten type definitions in SourceCode class (#19731) (루밀LuMir)
• 4d0c60d docs: Add Neovim to editor integrations (#19729) (Maria José Solano)
• f791da0 chore: remove unbalanced curly brace from .editorconfig (#19730) (Maria José Solano)
• e86edee refactor: Consolidate Config helpers (#19675) (Nicholas C. Zakas)
• 07c1a7e feat: add allowRegexCharacters to no-useless-escape (#19705) (sethamus)
• cf36352 chore: remove shared types (#19718) (Francesco Trotta)
• f60f276 refactor: Easier RuleContext creation (#19709) (Nicholas C. Zakas)

... (truncated)

• f341f21 9.28.0
• 779dda9 Build: changelog update for 9.28.0
• 175b7b8 chore: upgrade to @eslint/js@9.28.0 (#19802)
• 844f5a6 chore: package.json update for @​eslint/js release
• b0674be feat: Customization of serialization for languageOptions (#19760)
• 3ec2082 docs: Nested arrays in files config entry (#19799)
• 89a65b0 docs: clarify how config arrays can apply to subsets of files (#19788)
• 2ba8a0d docs: Add description of meta.namespace to plugin docs (#19798)
• eea3e7e fix: Remove configured global variables from GlobalScope#implicit (#19779)
• a95721f feat: Add --pass-on-unpruned-suppressions CLI option (#19773)
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