remark-lint-definition-case

A remark-lint rule that warns when definition labels in Markdown are not lowercase, helping enforce consistent casing. Current stable version is 4.0.1, published as part of the remark-lint monorepo. The plugin is ESM-only, supports Node.js 16+, and is compatible with remark-lint presets like remark-preset-lint-markdown-style-guide. It works with regular definitions and GFM footnote definitions. No options are required.