From 9f237bd5b16f4e4655e1ae783e598e0657b2d884 Mon Sep 17 00:00:00 2001
From: Leo McArdle <lmcardle@mozilla.com>
Date: Fri, 14 Jul 2023 13:39:08 +0100
Subject: [PATCH] fix(blog): ignore hidden code blocks when calculating read
 time (#9302)

---
 build/blog.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/build/blog.ts b/build/blog.ts
index 1f70ec89141e..17fb51b35a44 100644
--- a/build/blog.ts
+++ b/build/blog.ts
@@ -40,12 +40,16 @@ import { DEFAULT_LOCALE } from "../libs/constants/index.js";
 import { memoize } from "../content/utils.js";
 
 const READ_TIME_FILTER = /[\w<>.,!?]+/;
+const HIDDEN_CODE_BLOCK_MATCH = /```.*hidden[\s\S]*?```/g;
 
 function calculateReadTime(copy: string): number {
   return Math.max(
     1,
     Math.round(
-      copy.split(/\s+/).filter((w) => READ_TIME_FILTER.test(w)).length / 220
+      copy
+        .replace(HIDDEN_CODE_BLOCK_MATCH, "")
+        .split(/\s+/)
+        .filter((w) => READ_TIME_FILTER.test(w)).length / 220
     )
   );
 }