fix: clear the content layer cache when the Astro config changes (#12767)

* fix: clear the content layer cache when the Astro config changes

* Use deterministic-object-hash

* Switch back to safe-stringify

* Whitespace

5 files changed, 66 insertions, 5 deletions

diff --git a/.changeset/shaggy-dancers-run.md b/.changeset/shaggy-dancers-run.md
new file mode 100644
index 000000000..e95c16dd7
--- /dev/null
+++ b/.changeset/shaggy-dancers-run.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Clears the content layer cache when the Astro config is changed
diff --git a/packages/astro/src/content/content-layer.ts b/packages/astro/src/content/content-layer.ts
index e8c772a2c..c03952953 100644
--- a/packages/astro/src/content/content-layer.ts
+++ b/packages/astro/src/content/content-layer.ts
@@ -19,6 +19,7 @@ import {
 	getEntryConfigByExtMap,
 	getEntryDataAndImages,
 	globalContentConfigObserver,
+	safeStringify,
 } from './utils.js';
 
 export interface ContentLayerOptions {
@@ -87,7 +88,7 @@ export class ContentLayer {
 		// It uses wasm, so we need to load it asynchronously.
 		const { h64ToString } = await xxhash();
 
-		this.#generateDigest = (data: Record<string, unknown> | string) => {
+		this.#generateDigest = (data: unknown) => {
 			const dataString = typeof data === 'string' ? data : JSON.stringify(data);
 			return h64ToString(dataString);
 		};
@@ -143,12 +144,28 @@ export class ContentLayer {
 		}
 
 		logger.info('Syncing content');
+		const {
+			vite: _vite,
+			integrations: _integrations,
+			adapter: _adapter,
+			...hashableConfig
+		} = this.#settings.config;
+
+		const astroConfigDigest = safeStringify(hashableConfig);
+
 		const { digest: currentConfigDigest } = contentConfig.config;
 		this.#lastConfigDigest = currentConfigDigest;
 
 		let shouldClear = false;
-		const previousConfigDigest = await this.#store.metaStore().get('config-digest');
+		const previousConfigDigest = await this.#store.metaStore().get('content-config-digest');
+		const previousAstroConfigDigest = await this.#store.metaStore().get('astro-config-digest');
 		const previousAstroVersion = await this.#store.metaStore().get('astro-version');
+
+		if (previousAstroConfigDigest && previousAstroConfigDigest !== astroConfigDigest) {
+			logger.info('Astro config changed');
+			shouldClear = true;
+		}
+
 		if (currentConfigDigest && previousConfigDigest !== currentConfigDigest) {
 			logger.info('Content config changed');
 			shouldClear = true;
@@ -165,7 +182,10 @@ export class ContentLayer {
 			await this.#store.metaStore().set('astro-version', process.env.ASTRO_VERSION);
 		}
 		if (currentConfigDigest) {
-			await this.#store.metaStore().set('config-digest', currentConfigDigest);
+			await this.#store.metaStore().set('content-config-digest', currentConfigDigest);
+		}
+		if (astroConfigDigest) {
+			await this.#store.metaStore().set('astro-config-digest', astroConfigDigest);
 		}
 		await Promise.all(
 			Object.entries(contentConfig.config.collections).map(async ([name, collection]) => {
diff --git a/packages/astro/src/content/utils.ts b/packages/astro/src/content/utils.ts
index 3b9588c0b..32d53f5db 100644
--- a/packages/astro/src/content/utils.ts
+++ b/packages/astro/src/content/utils.ts
@@ -832,3 +832,26 @@ export function contentModuleToId(fileName: string) {
 	params.set(CONTENT_MODULE_FLAG, 'true');
 	return `${DEFERRED_MODULE}?${params.toString()}`;
 }
+
+// Based on https://github.com/sindresorhus/safe-stringify
+function safeStringifyReplacer(seen: WeakSet<object>) {
+	return function (_key: string, value: unknown) {
+		if (!(value !== null && typeof value === 'object')) {
+			return value;
+		}
+		if (seen.has(value)) {
+			return '[Circular]';
+		}
+		seen.add(value);
+		const newValue = Array.isArray(value) ? [] : {};
+		for (const [key2, value2] of Object.entries(value)) {
+			(newValue as Record<string, unknown>)[key2] = safeStringifyReplacer(seen)(key2, value2);
+		}
+		seen.delete(value);
+		return newValue;
+	};
+}
+export function safeStringify(value: unknown) {
+	const seen = new WeakSet();
+	return JSON.stringify(value, safeStringifyReplacer(seen));
+}
diff --git a/packages/astro/test/content-layer.test.js b/packages/astro/test/content-layer.test.js
index 41d2f0fce..0a7e2b289 100644
--- a/packages/astro/test/content-layer.test.js
+++ b/packages/astro/test/content-layer.test.js
@@ -288,7 +288,7 @@ describe('Content Layer', () => {
 			assert.equal(newJson.entryWithReference.data.something?.content, 'transform me');
 		});
 
-		it('clears the store on new build if the config has changed', async () => {
+		it('clears the store on new build if the content config has changed', async () => {
 			let newJson = devalue.parse(await fixture.readFile('/collections.json'));
 			assert.equal(newJson.increment.data.lastValue, 1);
 			await fixture.editFile('src/content.config.ts', (prev) => {
@@ -299,6 +299,18 @@ describe('Content Layer', () => {
 			assert.equal(newJson.increment.data.lastValue, 1);
 			await fixture.resetAllFiles();
 		});
+
+		it('clears the store on new build if the Astro config has changed', async () => {
+			let newJson = devalue.parse(await fixture.readFile('/collections.json'));
+			assert.equal(newJson.increment.data.lastValue, 1);
+			await fixture.editFile('astro.config.mjs', (prev) => {
+				return prev.replace('Astro content layer', 'Astro more content layer');
+			});
+			await fixture.build();
+			newJson = devalue.parse(await fixture.readFile('/collections.json'));
+			assert.equal(newJson.increment.data.lastValue, 1);
+			await fixture.resetAllFiles();
+		});
 	});
 
 	describe('Dev', () => {
diff --git a/packages/astro/test/fixtures/content-layer/astro.config.mjs b/packages/astro/test/fixtures/content-layer/astro.config.mjs
index 6b56f41fd..06f4f45d9 100644
--- a/packages/astro/test/fixtures/content-layer/astro.config.mjs
+++ b/packages/astro/test/fixtures/content-layer/astro.config.mjs
@@ -3,7 +3,8 @@ import { defineConfig } from 'astro/config';
 import { fileURLToPath } from 'node:url';
 
 export default defineConfig({
-  integrations: [mdx(), {
+	name: 'Astro content layer',
+	integrations: [mdx(), {
 		name: '@astrojs/my-integration',
 		hooks: {
 				'astro:server:setup': async ({ server, refreshContent }) => {