ESLint v10.12.0 released

Highlights

Support for tokens and comments in SourceCode

Rule authors often work with ESLint’s SourceCode object, which represents the JavaScript source code being linted. Its getText(), getLoc(), and getRange() methods have always accepted a node, token, or comment, but the documentation didn’t describe every argument type, and the type definitions rejected some valid calls, such as passing a comment.

This release updates the documentation and type definitions to match the actual behavior. This also aligns these methods with implementations of the core SourceCodeBase interface used in language plugins. Code that calls these methods is unaffected, but TypeScript code that implements or mocks SourceCode may need its getText(), getLoc(), and getRange() signatures updated to accept tokens and comments.

Rule fixes

The following rules have been updated to work correctly in certain edge cases, including autofix behavior and the handling of supplementary Unicode characters in code:

• consistent-return
• max-lines-per-function
• new-cap
• no-eval
• no-invalid-this
• no-loss-of-precision
• prefer-arrow-callback
• prefer-exponentiation-operator

Features

• 4618052 feat: handle astral letters in new-cap (#21357) (sary)
• 4ec5168 feat: allow SourceCode#getText() to accept tokens and comments (#21340) (electrohyun)

Bug Fixes

• bc51eee fix: prefer-arrow-callback false positive in conditional test (#21373) (Daniel Pinto)
• bbff86c fix: skip lines with multiple comments in max-lines-per-function (#21332) (xbinaryx)
• efc4d6b fix: astral letters in consistent-return, no-eval, no-invalid-this (#21360) (lumir)
• 93de066 fix: prefer-exponentiation-operator autofix for async function base (#21322) (Vladimir Babin)
• 02e34ff fix: add missing space after else in curly autofix (#21355) (Pixel)
• b14b8bc fix: correct id-length message for long private names (#21348) (Pixel)
• 69aac01 fix: support TSFunctionType in getFunctionHeadLoc (#21335) (xbinaryx)
• 686630e fix: no-loss-of-precision false positive with 0.e5 (#21337) (sethamus)

Documentation

• 67eb586 docs: Update README (GitHub Actions Bot)
• 5370d7e docs: clarify one-var separateRequires matches any require() call (#21192) (sethamus)
• 8816c1d docs: Update README (GitHub Actions Bot)
• 3d2e7ce docs: fix typo in no-unused-expressions documentation (#21346) (bytedoe)

Chores

• 152067f chore: update ecosystem plugins (#21362) (ESLint Bot)
• b56d58e chore: update github/codeql-action action to v4.38.2 (#21376) (renovate[bot])
• bfaea12 perf: cache normalized config globals per languageOptions (#21364) (James Ross)
• 322209e ci: avoid Nx cache in ecosystem tests and disable failing test (#21369) (Francesco Trotta)
• d166567 chore: update dependency prettier to v3.9.9 (#21371) (renovate[bot])
• 29585ce chore: update dependency eslint-plugin-expect-type to ^0.7.0 (#21359) (renovate[bot])
• 39d79ba chore: update github/codeql-action action to v4.38.1 (#21354) (renovate[bot])
• 182a6e9 chore: update dependency prettier to v3.9.8 (#21352) (renovate[bot])
• f995127 chore: remove CLAUDE.md in favor of AGENTS.md (#21339) (Jarren)
• b95fb6c chore: update dependency prettier to v3.9.7 (#21347) (renovate[bot])
• 3782dd4 chore: update ecosystem plugins (#21342) (ESLint Bot)