fix(rss): make title optional if description is provided (#9610)

* fix(rss): make title optional if description is provided

* feat(rss): simplify schema

* fix(rss): update tests to match new behavior

* Update packages/astro-rss/test/pagesGlobToRssItems.test.js

Co-authored-by: Erika <3019731+Princesseuh@users.noreply.github.com>

* Update packages/astro-rss/test/pagesGlobToRssItems.test.js

Co-authored-by: Erika <3019731+Princesseuh@users.noreply.github.com>

* feat: make link and pubDate optional

* feat: improve item normalization

* Update shy-spoons-sort.md

* Fix test fail

* Update .changeset/shy-spoons-sort.md

Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>

---------

Co-authored-by: Erika <3019731+Princesseuh@users.noreply.github.com>
Co-authored-by: bluwy <bjornlu.dev@gmail.com>
Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>

3 files changed, 76 insertions, 26 deletions

diff --git a/packages/astro-rss/src/index.ts b/packages/astro-rss/src/index.ts
index c8cf19d60..b866365ab 100644
--- a/packages/astro-rss/src/index.ts
+++ b/packages/astro-rss/src/index.ts
@@ -32,9 +32,9 @@ export type RSSOptions = {
 
 export type RSSFeedItem = {
 	/** Link to item */
-	link: string;
+	link: z.infer<typeof rssSchema>['link'];
 	/** Full content of the item. Should be valid HTML */
-	content?: string | undefined;
+	content?: z.infer<typeof rssSchema>['content'];
 	/** Title of item */
 	title: z.infer<typeof rssSchema>['title'];
 	/** Publication date of item */
@@ -55,11 +55,10 @@ export type RSSFeedItem = {
 	enclosure?: z.infer<typeof rssSchema>['enclosure'];
 };
 
-type ValidatedRSSFeedItem = z.infer<typeof rssFeedItemValidator>;
+type ValidatedRSSFeedItem = z.infer<typeof rssSchema>;
 type ValidatedRSSOptions = z.infer<typeof rssOptionsValidator>;
 type GlobResult = z.infer<typeof globResultValidator>;
 
-const rssFeedItemValidator = rssSchema.extend({ link: z.string(), content: z.string().optional() });
 const globResultValidator = z.record(z.function().returns(z.promise(z.any())));
 
 const rssOptionsValidator = z.object({
@@ -67,7 +66,7 @@ const rssOptionsValidator = z.object({
 	description: z.string(),
 	site: z.preprocess((url) => (url instanceof URL ? url.href : url), z.string().url()),
 	items: z
-		.array(rssFeedItemValidator)
+		.array(rssSchema)
 		.or(globResultValidator)
 		.transform((items) => {
 			if (!Array.isArray(items)) {
@@ -117,7 +116,7 @@ async function validateRssOptions(rssOptions: RSSOptions) {
 				if (path === 'items' && code === 'invalid_union') {
 					return [
 						message,
-						`The \`items\` property requires properly typed \`title\`, \`pubDate\`, and \`link\` keys.`,
+						`The \`items\` property requires at least the \`title\` or \`description\` key. They must be properly typed, as well as \`pubDate\` and \`link\` keys if provided.`,
 						`Check your collection's schema, and visit https://docs.astro.build/en/guides/rss/#generating-items for more info.`,
 					].join('\n');
 				}
@@ -138,10 +137,7 @@ export function pagesGlobToRssItems(items: GlobResult): Promise<ValidatedRSSFeed
 					`[RSS] You can only glob entries within 'src/pages/' when passing import.meta.glob() directly. Consider mapping the result to an array of RSSFeedItems. See the RSS docs for usage examples: https://docs.astro.build/en/guides/rss/#2-list-of-rss-feed-objects`
 				);
 			}
-			const parsedResult = rssFeedItemValidator.safeParse(
-				{ ...frontmatter, link: url },
-				{ errorMap }
-			);
+			const parsedResult = rssSchema.safeParse({ ...frontmatter, link: url }, { errorMap });
 
 			if (parsedResult.success) {
 				return parsedResult.data;
@@ -210,15 +206,19 @@ async function generateRSS(rssOptions: ValidatedRSSOptions): Promise<string> {
 		);
 	// items
 	root.rss.channel.item = items.map((result) => {
-		// If the item's link is already a valid URL, don't mess with it.
-		const itemLink = isValidURL(result.link)
-			? result.link
-			: createCanonicalURL(result.link, rssOptions.trailingSlash, site).href;
-		const item: any = {
-			title: result.title,
-			link: itemLink,
-			guid: { '#text': itemLink, '@_isPermaLink': 'true' },
-		};
+		const item: Record<string, unknown> = {};
+
+		if (result.title) {
+			item.title = result.title;
+		}
+		if (typeof result.link === 'string') {
+			// If the item's link is already a valid URL, don't mess with it.
+			const itemLink = isValidURL(result.link)
+				? result.link
+				: createCanonicalURL(result.link, rssOptions.trailingSlash, site).href;
+			item.link = itemLink;
+			item.guid = { '#text': itemLink, '@_isPermaLink': 'true' };
+		}
 		if (result.description) {
 			item.description = result.description;
 		}
diff --git a/packages/astro-rss/src/schema.ts b/packages/astro-rss/src/schema.ts
index 98aa35f81..788fe86fb 100644
--- a/packages/astro-rss/src/schema.ts
+++ b/packages/astro-rss/src/schema.ts
@@ -1,12 +1,11 @@
 import { z } from 'astro/zod';
 
-export const rssSchema = z.object({
-	title: z.string(),
+const sharedSchema = z.object({
 	pubDate: z
 		.union([z.string(), z.number(), z.date()])
-		.transform((value) => new Date(value))
-		.refine((value) => !isNaN(value.getTime())),
-	description: z.string().optional(),
+		.optional()
+		.transform((value) => (value === undefined ? value : new Date(value)))
+		.refine((value) => (value === undefined ? value : !isNaN(value.getTime()))),
 	customData: z.string().optional(),
 	categories: z.array(z.string()).optional(),
 	author: z.string().optional(),
@@ -19,4 +18,21 @@ export const rssSchema = z.object({
 			type: z.string(),
 		})
 		.optional(),
+	link: z.string().optional(),
+	content: z.string().optional(),
 });
+
+export const rssSchema = z.union([
+	z
+		.object({
+			title: z.string(),
+			description: z.string().optional(),
+		})
+		.merge(sharedSchema),
+	z
+		.object({
+			title: z.string().optional(),
+			description: z.string(),
+		})
+		.merge(sharedSchema),
+]);
diff --git a/packages/astro-rss/test/pagesGlobToRssItems.test.js b/packages/astro-rss/test/pagesGlobToRssItems.test.js
index 82af5ba12..e72f6d3b3 100644
--- a/packages/astro-rss/test/pagesGlobToRssItems.test.js
+++ b/packages/astro-rss/test/pagesGlobToRssItems.test.js
@@ -66,7 +66,7 @@ describe('pagesGlobToRssItems', () => {
 		return chai.expect(pagesGlobToRssItems(globResult)).to.be.rejected;
 	});
 
-	it('should fail on missing "title" key', () => {
+	it('should fail on missing "title" key and "description"', () => {
 		const globResult = {
 			'./posts/php.md': () =>
 				new Promise((resolve) =>
@@ -75,11 +75,45 @@ describe('pagesGlobToRssItems', () => {
 						frontmatter: {
 							title: undefined,
 							pubDate: phpFeedItem.pubDate,
-							description: phpFeedItem.description,
+							description: undefined,
 						},
 					})
 				),
 		};
 		return chai.expect(pagesGlobToRssItems(globResult)).to.be.rejected;
 	});
+
+	it('should not fail on missing "title" key if "description" is present', () => {
+		const globResult = {
+			'./posts/php.md': () =>
+				new Promise((resolve) =>
+					resolve({
+						url: phpFeedItem.link,
+						frontmatter: {
+							title: undefined,
+							pubDate: phpFeedItem.pubDate,
+							description: phpFeedItem.description,
+						},
+					})
+				),
+		};
+		return chai.expect(pagesGlobToRssItems(globResult)).to.not.be.rejected;
+	});
+
+	it('should fail on missing "description" key if "title" is present', () => {
+		const globResult = {
+			'./posts/php.md': () =>
+				new Promise((resolve) =>
+					resolve({
+						url: phpFeedItem.link,
+						frontmatter: {
+							title: phpFeedItem.title,
+							pubDate: phpFeedItem.pubDate,
+							description: undefined,
+						},
+					})
+				),
+		};
+		return chai.expect(pagesGlobToRssItems(globResult)).to.not.be.rejected;
+	});
 });