FIX: allow rss feeds to have an enclosure with length of 0 (#9967)

* fix: allow rss feeds to have an enclosure with length of 0

* chore: add changeset

* fix: typo on test

* fix: update changeset description

Co-authored-by: Florian Lefebvre <contact@florian-lefebvre.dev>

---------

Co-authored-by: Florian Lefebvre <contact@florian-lefebvre.dev>

.changeset/tidy-spoons-suffer.md

@@ -0,0 +1,5 @@
+---
+"@astrojs/rss": patch
+---
+
+Allows `enclosure' to have a length of 0

packages/astro-rss/src/schema.ts

@@ -16,7 +16,7 @@ export const rssSchema = z.object({
 	enclosure: z
 		.object({
 			url: z.string(),
-			length: z.number().positive().int().finite(),
+			length: z.number().nonnegative().int().finite(),
 			type: z.string(),
 		})
 		.optional(),

packages/astro-rss/test/rss.test.js

@@ -227,4 +227,27 @@ describe('getRssString', () => {
 		}
 		chai.expect(error).to.be.null;
 	});
+
+	it('should not fail when an enclosure has a length of 0', async () => {
+		const str = await getRssString({
+			title,
+			description,
+			items: [
+				{
+					title: 'Title',
+					pubDate: new Date().toISOString(),
+					description: 'Description',
+					link: '/link',
+					enclosure: {
+						url: '/enclosure',
+						length: 0,
+						type: 'audio/mpeg',
+					},
+				},
+			],
+			site,
+		});
+
+		chai.expect(str).to.not.throw;
+	});
 });