remark-lint-file-extension
JSON →A remark-lint rule to warn when a file's extension does not match a configured style. Current stable version is 3.0.1, part of the remark-lint monorepo with regular updates. It checks file extensions against a list of allowed values, supports allowing extensionless files (default true), and provides a TypeScript type for configuration. Key differentiator: it enforces consistent file naming conventions in markdown projects, useful for ensuring .md vs .mdx compliance. ESM-only since v3, requires Node.js 16+.
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