fix: handle uppercase image file extensions

.changeset/six-toes-sort.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Correctly handles images in content collections with uppercase file extensions

packages/astro/src/assets/utils/resolveImports.ts

@@ -20,7 +20,7 @@ export function imageSrcToImportId(imageSrc: string, filePath?: string): string
 		return;
 	}
 	// We only care about images
-	const ext = imageSrc.split('.').at(-1) as (typeof VALID_INPUT_FORMATS)[number] | undefined;
+	const ext = imageSrc.split('.').at(-1)?.toLowerCase() as (typeof VALID_INPUT_FORMATS)[number] | undefined;
 	if (!ext || !VALID_INPUT_FORMATS.includes(ext)) {
 		return;
 	}

packages/astro/test/content-layer.test.js

@@ -217,6 +217,12 @@ describe('Content Layer', () => {
 			assert.equal(json.entryWithReference.data.heroImage.format, 'jpg');
 		});
 
+		it('loads images with uppercase extensions', async () => {
+			assert.ok(json.atlantis.data.heroImage.src.startsWith('/_astro'));
+			assert.ok(json.atlantis.data.heroImage.src.endsWith('.JPG'));
+			assert.equal(json.atlantis.data.heroImage.format, 'jpg');
+		});
+
 		it('loads images from custom loaders', async () => {
 			assert.ok(json.images[0].data.image.src.startsWith('/_astro'));
 			assert.equal(json.images[0].data.image.format, 'jpg');

packages/astro/test/fixtures/content-layer/src/content/space/atlantis.md

@@ -0,0 +1,11 @@
+---
+title: Atlantis
+description: 'Learn about the Atlantis NASA space shuttle.'
+publishedDate: 'Sat May 21 2022 00:00:00 GMT-0400 (Eastern Daylight Time)'
+tags: [space, 90s]
+heroImage: "./atlantis.JPG"
+---
+
+**Source:** [Wikipedia](https://en.wikipedia.org/wiki/Space_Shuttle_Atlantis)
+
+Space Shuttle Atlantis (Orbiter Vehicle Designation: OV-104) is a Space Shuttle orbiter vehicle belonging to the National Aeronautics and Space Administration (NASA), the spaceflight and space exploration agency of the United States. Constructed by the Rockwell International company in Southern California and delivered to the Kennedy Space Center in Eastern Florida in April 1985, Atlantis is the fourth operational and the second-to-last Space Shuttle built. Its maiden flight was STS-51-J from 3 to 7 October 1985.

packages/astro/test/fixtures/content-layer/src/pages/collections.json.js

@@ -12,6 +12,7 @@ export async function GET() {
 	const simpleLoader = await getCollection('cats');
 
 	const entryWithReference = await getEntry('spacecraft', 'columbia-copy');
+	const atlantis = await getEntry('spacecraft', 'atlantis');
 	const referencedEntry = await getEntry(entryWithReference.data.cat);
 
 	const entryWithImagePath = await getEntry('spacecraft', 'lunar-module');
@@ -49,6 +50,7 @@ export async function GET() {
 			yamlLoader,
 			tomlLoader,
 			nestedJsonLoader,
+			atlantis
 		})
 	);
 }