rehype‑rewrite is an ESM‑only npm plugin for the **rehype** HTML processor that lets developers programmatically rewrite any element in a Hast syntax tree—optionally scoped by CSS‑style selectors—by mutating node properties, children, or content. It’s aimed at web developers and toolbuilders who need fine‑grained, code‑driven transformations of HTML/Markdown output (e.g., adding classes, styles, or injecting markup) within the unified/rehype ecosystem.