1import type { RehypePlugin } from "@astrojs/markdown-remark";
 2import { visit } from "unist-util-visit";
 3
 4// Relative links break inside feed readers; point them back at the site.
 5export function rehypeAbsoluteLinks(options: { site: string }): RehypePlugin {
 6  return () => (tree) => {
 7    visit(tree, "element", (node) => {
 8      const href = node.properties?.href;
 9      if (
10        node.tagName !== "a" ||
11        typeof href !== "string" ||
12        !href.startsWith("/") ||
13        href.startsWith("//")
14      ) {
15        return;
16      }
17      node.properties.href = new URL(href, options.site).toString();
18    });
19  };
20}