Summary

• Align isFileIgnored with ESLint v10 semantics: evaluate ignore patterns sequentially where later patterns override earlier ones
• A ! prefix negates (re-includes) a file that was previously matched by an earlier ignore pattern
• Merge all global ignore entries before evaluating, so ! negation works across separate global ignore entries
• Update docs: ! is now supported (was previously marked as unsupported)

Examples:

// Re-include specific file inside ignored directory
{ ignores: ['build/**/*', '!build/test.js'] }

// Cross-entry negation also works
{ ignores: ['build/**/*'] },
{ ignores: ['!build/test.js'] },

// Entry-level ignores
{ files: ['**/*.ts'], ignores: ['vendor/**/*', '!vendor/keep/**/*'], rules: {...} }

Known difference from ESLint v10:
{ ignores: ['dir/**', '!dir/keep.ts'] } — In ESLint v10, dir/** blocks directory traversal so ! cannot re-include during eslint .. In rslint, files from tsconfig Programs bypass directory traversal, so ! re-includes at the file matching level. This is a file discovery architecture difference (to be addressed in the files-driven-lint PR), not an ignore matching logic issue. Using dir/**/* instead of dir/** produces identical behavior in both tools.

Related Links

• ESLint v10 ignore docs: https://eslint.org/docs/latest/use/configure/ignore#unignore-files-and-directories
• Depends on: fix: filter nested configs covered by parent global ignores #589 (config discovery respects parent ignores)

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).