From 359484c139c074e60f188616b3f6435cde46c42e Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Thu, 28 Dec 2023 08:48:14 -0800
Subject: [PATCH] fix: more robust tags parsing

---
 quartz/plugins/transformers/frontmatter.ts | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/quartz/plugins/transformers/frontmatter.ts b/quartz/plugins/transformers/frontmatter.ts
index d50217ba6..26a665d8f 100644
--- a/quartz/plugins/transformers/frontmatter.ts
+++ b/quartz/plugins/transformers/frontmatter.ts
@@ -49,11 +49,19 @@ export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined>
               data.title = file.stem ?? "Untitled"
             }
 
-            if (data.tags && !Array.isArray(data.tags)) {
+            if (data.tags) {
+              // coerce to array
+              if (!Array.isArray(data.tags)) {
+                data.tags = data.tags
+                  .toString()
+                  .split(oneLineTagDelim)
+                  .map((tag: string) => tag.trim())
+              }
+
+              // remove all non-string tags
               data.tags = data.tags
-                .toString()
-                .split(oneLineTagDelim)
-                .map((tag: string) => tag.trim())
+                .filter((tag: unknown) => typeof tag === "string" || typeof tag === "number")
+                .map((tag: string | number) => tag.toString())
             }
 
             // slug them all!!