ESLint v10.6.0 released

Highlights

New option checkRelationalComparisons in no-constant-binary-expression

ESLint v10.6.0 introduces a new option checkRelationalComparisons for the no-constant-binary-expression rule. When enabled, the rule reports relational comparisons using <, <=, >, or >= whose result is always constant based on their literal operands.

For example:

const value = "a" > "b"; // always `false`
1

while (0 <= 0) { // always `true`
    /* ... */
}
1
2
3

Rule refinements

The following rules have been tweaked to improve correctness and ensure more consistent or intuitive behavior in edge cases:

• max-classes-per-file
• max-nested-callbacks
• no-constant-binary-expression
• no-extra-boolean-cast
• no-promise-executor-return
• no-throw-literal
• prefer-exponentiation-operator
• prefer-promise-reject-errors
• radix

Features

• b1f9106 feat: detect Symbol() and BigInt() in no-constant-binary-expression (#20981) (Taejin Kim)
• f291007 feat: add checkRelationalComparisons to no-constant-binary-expression (#20948) (sethamus)

Bug Fixes

• 6b05784 fix: prefer-exponentiation-operator invalid autofix at statement start (#20997) (Milos Djermanovic)
• bb9eb2a fix: account for shadowed Boolean in no-extra-boolean-cast (#21013) (den$)
• 8fd8741 fix: don’t report shadowed undefined in radix rule (#21011) (Pixel)
• 5784980 fix: don’t report shadowed undefined in no-throw-literal (#21010) (Pixel)
• 9cd1e6d fix: suppress invalid class suggestion in no-promise-executor-return (#21008) (Pixel)
• d4eb2dc fix: don’t report shadowed undefined in prefer-promise-reject-errors (#21006) (Pixel)
• 2360464 fix: prefer-promise-reject-errors false positives for shadowed Promise (#21003) (den$)
• 63d52d2 fix: restore max-classes-per-file report range (#21002) (Pixel)
• 7feaff0 fix: callback detection logic for IIFEs in max-nested-callbacks (#20979) (fnx)
• 399a2ec fix: don’t report inner non-callbacks in max-nested-callbacks (#20995) (Milos Djermanovic)

Documentation

• a83683d docs: Update README (GitHub Actions Bot)
• f5449f9 docs: document userland patterns for global assertionOptions in RuleT… (#20986) (playgirl)
• bea49f7 docs: Update README (GitHub Actions Bot)
• e5f70f9 docs: update code-path diagrams (#20984) (Tanuj Kanti)
• 8890c2d docs: add TypeScript config guidance for MCP server (#20796) (Pierluigi Lenoci)
• 3eb3d9b docs: Update README (GitHub Actions Bot)
• c5bb59c docs: Update README (GitHub Actions Bot)
• eb3c97c docs: fix grammar in prefer-const rule description (#20983) (lumir)

Chores

• 6a42034 ci: run ecosystem tests on main branch (#20891) (sethamus)
• 3dbacdb ci: bump actions/checkout from 6 to 7 (#21014) (dependabot[bot])
• c3abfca chore: correct JSDoc param types in html formatter (#21018) (Minseon Kim)
• a832320 ci: split ecosystem tests into separate jobs (#21001) (xbinaryx)
• 27166e7 chore: update ecosystem plugins (#21005) (ESLint Bot)
• 865d76e ci: bump pnpm/action-setup from 6.0.8 to 6.0.9 (#20989) (dependabot[bot])
• 27a88c9 chore: update dependency markdown-it to v14 in root (#20994) (Milos Djermanovic)
• 970cea6 chore: update dependency markdown-it to v14 (#20993) (Milos Djermanovic)
• b482120 chore: update dependency prettier to v3.8.4 (#20990) (renovate[bot])
• 6993fb3 chore: update ecosystem plugins (#20985) (ESLint Bot)