add target=blank automation

eleventy.config.js

@@ -1,5 +1,8 @@
-import { attrs } from "@mdit/plugin-attrs";
 import { eleventyImageTransformPlugin } from "@11ty/eleventy-img";
+
+import { attrs } from "@mdit/plugin-attrs";
+import { markdownitLinkAttributes } from 'markdown-it-link-attributes';
+
 import path from "node:path";
 
 import pluginFilters from "./_config/filters.js";
@@ -8,6 +11,18 @@ export default async function (eleventyConfig) {
 	/* Markdown HTML attribute parsing */
 	eleventyConfig.amendLibrary("md", (mdLib) => mdLib.use(attrs));
 
+	/* Markdown apply target="_blank" to all external links */
+	const milaOptions = {
+    matcher(href) {
+      return href.match(/^https?:\/\//);
+    },
+    attrs: {
+      target: "_blank",
+      rel: "external",
+    },
+  };
+	eleventyConfig.amendLibrary("md", (mdLib) => mdLib.use(markdownitLinkAttributes, milaOptions));
+
 	/* Bundles */
 	/* CSS */
 	eleventyConfig.addBundle("css", {