Throw the error when `site` option is missing (#3956)

* Throw the error when site option is missing

* Update index.ts

* Update index.ts

* Update rss.test.js

* Update index.ts

Co-authored-by: Fred K. Schott <fkschott@gmail.com>

3 files changed, 26 insertions, 0 deletions

diff --git a/.changeset/many-glasses-roll.md b/.changeset/many-glasses-roll.md
new file mode 100644
index 000000000..7f9dd7313
--- /dev/null
+++ b/.changeset/many-glasses-roll.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/rss': patch
+---
+
+Throw the error when 'site' option is missing
diff --git a/packages/astro-rss/src/index.ts b/packages/astro-rss/src/index.ts
index d715b7dc0..9f55ee9f1 100644
--- a/packages/astro-rss/src/index.ts
+++ b/packages/astro-rss/src/index.ts
@@ -76,10 +76,17 @@ function mapGlobResult(items: GlobResult): Promise<RSSFeedItem[]> {
 }
 
 export default async function getRSS(rssOptions: RSSOptions) {
+	const { site } = rssOptions;
 	let { items } = rssOptions;
+
+	if (!site) {
+		throw new Error('[RSS] the "site" option is required, but no value was given.');
+	}
+
 	if (isGlobResult(items)) {
 		items = await mapGlobResult(items);
 	}
+	
 	return {
 		body: await generateRSS({
 			rssOptions,
diff --git a/packages/astro-rss/test/rss.test.js b/packages/astro-rss/test/rss.test.js
index 84cf7e36c..f4dc0ba6e 100644
--- a/packages/astro-rss/test/rss.test.js
+++ b/packages/astro-rss/test/rss.test.js
@@ -125,6 +125,20 @@ describe('rss', () => {
 	});
 
 	describe('errors', () => {
+		it('should provide a error message when a "site" option is missing', async () => {
+			try {
+				await rss({
+					title,
+					description,
+					items: [phpFeedItem, web1FeedItem]
+				});
+		
+				chai.expect(false).to.equal(true, 'Should have errored');
+			} catch (err) {
+        chai.expect(err.message).to.contain('[RSS] the "site" option is required, but no value was given.');
+			}
+		});
+		
 		it('should provide a good error message when a link is not provided', async () => {
 			try {
 				await rss({