unified-lint-rule

A helper package for the unified ecosystem that simplifies creating linting rules for processors like remark, retext, and rehype. Version 3.0.1 is the current stable release (ESM-only, requires Node.js 16+). It provides a `lintRule` function that takes metadata and a rule callback, handling plugin registration, error messages via VFile, and severity levels. Key differentiators: reduces boilerplate for unified lint rule authors, supports both sync and async rules, includes TypeScript types, and is part of the official remark-lint family.