From 4db1defaefca495a39eff7de8dbe8b8d913fa5c1 Mon Sep 17 00:00:00 2001
From: svemagie <869694+svemagie@users.noreply.github.com>
Date: Sat, 11 Apr 2026 18:45:18 +0200
Subject: [PATCH] fix: add class to unfurl fallback link to prevent YouTube
 double-embed

When unfurl cache is failed/missing for a YouTube URL, renderFallbackLink
returned a classless <a> which matched the youtube-link-to-embed transform
regex (the class exclusion from 819aab1 didn't protect it). This created
one embed from the custom transform and a second from eleventy-plugin-youtube-embed.

Adding class="unfurl-fallback" triggers the (?![^>]*\bclass=) exclusion,
preventing both embeds on like/repost pages with uncached YouTube URLs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 lib/unfurl-shortcode.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/unfurl-shortcode.js b/lib/unfurl-shortcode.js
index ff8ba93..e9f6dea 100644
--- a/lib/unfurl-shortcode.js
+++ b/lib/unfurl-shortcode.js
@@ -76,7 +76,7 @@ export function escapeHtml(str) {
 
 export function renderFallbackLink(url) {
   const domain = escapeHtml(extractDomain(url));
-  return `<a href="${escapeHtml(url)}" rel="noopener" target="_blank">${domain}</a>`;
+  return `<a href="${escapeHtml(url)}" rel="noopener" target="_blank" class="unfurl-fallback">${domain}</a>`;
 }
 
 export function renderCard(url, metadata) {