remark-lint-no-multiple-toplevel-headings

A remark-lint rule that warns when multiple top-level headings (rank 1) are used in a Markdown document. Current stable version is 4.0.1. This package is part of the remark-lint ecosystem, with releases typically following semantic versioning on a monthly cadence. It differs from other heading‐duplicate checks by focusing specifically on the primary heading level, often used in presets like `remark-preset-lint-markdown-style-guide`. It supports custom depth configuration (1–6) via options. ESM-only, with TypeScript types included. Version 4.x requires remark-lint >=10 and Node >=16.