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Describe the bug Describe the bug After upgrading from to , ESLint crashes with a when linting markdown files (e.g. ). The crash originates from the rule. Its internal utility calls , which does not exist on the SourceCode object introduced by the "markdown: Use markdown language" change in v7.5.0 (). This happens with the default config — no custom markdown language configuration is needed to trigger it. Reproduction Then run on any project that contains a . ✅ Works on ❌ Crashes on and later (tested ) Expected behavior Markdown files should be excluded from rules that rely on JS-specific SourceCode APIs (like ), or the rules should gracefully handle non-JS SourceCode objects without crashing. Related #806 — Similar crash on markdown files, but triggered by explicit language configuration #818 — PR that introduced the markdown language change Important notice This issue description has mostly been generated by Claude Opus 4.6 with context given by me. Reproduction https://github.com/kevinmarrec/config/pull/93 System Info Used Package Manager bun Validations [x] Follow our Code of Conduct [x] Read the Contributing Guide. [x] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate. [x] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead. [x] The provided reproduction is a minimal reproducible of the bug. Contributions [ ] I am willing to submit a PR to fix this issue [ ] I am willing to submit a PR with failing tests (actually just go ahead and do it, thanks!)