Add support for iframes in imported HTML

server/utils/turndown/frames.ts

@@ -0,0 +1,21 @@
+import TurndownService from "turndown";
+
+/**
+ * A turndown plugin to convert iframes to markdown links.
+ *
+ * @param turndownService The TurndownService instance.
+ */
+export default function images(turndownService: TurndownService) {
+  turndownService.addRule("frames", {
+    filter: "iframe",
+    replacement(content, node: HTMLIFrameElement) {
+      const src = (node.getAttribute("src") || "").replace(/\n+/g, "");
+      const title = cleanAttribute(node.getAttribute("title") || "");
+      return src ? "[" + (title || src) + "]" + "(" + src + ")" : "";
+    },
+  });
+}
+
+function cleanAttribute(attribute: string) {
+  return attribute ? attribute.replace(/(\n+\s*)+/g, "\n") : "";
+}