HAST Heading Utility

hast-util-heading is a highly specialized utility within the unified ecosystem, designed to programmatically check if a given HAST (Hypertext Abstract Syntax Tree) node represents a heading element (h1-h6, hgroup). The current stable version is 3.0.0. As part of the syntax-tree collective, it adheres to a release cadence that maintains compatibility with currently supported Node.js versions, typically dropping support for unmaintained Node.js versions with new major releases. Its key differentiator is its singular, focused purpose: providing a reliable, performant boolean check for heading elements, which is particularly useful in linting tools, accessibility checkers, or content transformers operating on HTML syntax trees. It is built for ESM-first environments and provides full TypeScript type definitions.