Custom plugin for description and "minutes reading"

remark-post-meta.mjs

@@ -0,0 +1,16 @@
+import getReadingTime from 'reading-time';
+import { toString as mdToString } from 'mdast-util-to-string';
+
+const ELLIPSIS = '\u2026';
+
+export default function() {
+  return function (tree, { data }) {
+    const textOnPage = mdToString(tree);
+
+    const readingTime = getReadingTime(textOnPage);
+    data.astro.frontmatter.readingTime = readingTime.text;
+
+    const description = textOnPage.slice(0, 100) + ELLIPSIS;
+    data.astro.frontmatter.description = description;
+  };
+}