refactor: convert JavaScript files to TypeScript

src/utils/frontmatter.ts

@@ -0,0 +1,39 @@
+import getReadingTime from 'reading-time';
+import { toString } from 'mdast-util-to-string';
+import lazyLoadPlugin from 'rehype-plugin-image-native-lazy-loading';
+
+export function readingTimeRemarkPlugin() {
+  return function (tree, file) {
+    const textOnPage = toString(tree);
+    const readingTime = Math.ceil(getReadingTime(textOnPage).minutes);
+
+    file.data.astro.frontmatter.readingTime = readingTime;
+  };
+}
+
+export function responsiveTablesRehypePlugin() {
+  return function (tree) {
+    if (!tree.children) return;
+
+    for (let i = 0; i < tree.children.length; i++) {
+      const child = tree.children[i];
+
+      if (child.type === 'element' && child.tagName === 'table') {
+        const wrapper = {
+          type: 'element',
+          tagName: 'div',
+          properties: {
+            style: 'overflow:auto',
+          },
+          children: [child],
+        };
+
+        tree.children[i] = wrapper;
+
+        i++;
+      }
+    }
+  };
+}
+
+export const lazyImagesRehypePlugin = lazyLoadPlugin;