remark-lint-no-duplicate-headings
JSON →remark-lint rule to warn when headings with equivalent text appear in a Markdown document. Current stable version is 4.0.1. Part of the remark-lint ecosystem, this plugin is ESM-only, requires Node.js 16+, and is included in the `remark-preset-lint-markdown-style-guide` preset. It helps screen reader users and prevents fragile automatic heading IDs. Unlike custom checks, it integrates directly with unified pipelines and CLI.
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