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

.changeset/shaggy-dancers-run.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Clears the content layer cache when the Astro config is changed

packages/astro/src/content/content-layer.ts

@@ -19,6 +19,7 @@ import {
 	getEntryConfigByExtMap,
 	getEntryDataAndImages,
 	globalContentConfigObserver,
+	safeStringify,
 } from './utils.js';
 
 export interface ContentLayerOptions {
@@ -87,8 +88,8 @@ export class ContentLayer {
 		// It uses wasm, so we need to load it asynchronously.
 		const { h64ToString } = await xxhash();
 
-		this.#generateDigest = (data: Record<string, unknown> | string) => {
-			const dataString = typeof data === 'string' ? data : JSON.stringify(data);
+		this.#generateDigest = (data: unknown) => {
+			const dataString = typeof data === 'string' ? data : safeStringify(data);
 			return h64ToString(dataString);
 		};
 
@@ -143,12 +144,24 @@ export class ContentLayer {
 		}
 
 		logger.info('Syncing content');
+		const { vite: _vite, integrations: _integrations, adapter: _adapter, ...hashableConfig } = this.#settings.config;
+		const generateDigest = await this.#getGenerateDigest()
+
+		const astroConfigDigest = generateDigest(hashableConfig);
+
 		const { digest: currentConfigDigest } = contentConfig.config;
 		this.#lastConfigDigest = currentConfigDigest;
 
 		let shouldClear = false;
 		const previousConfigDigest = await this.#store.metaStore().get('config-digest');
+		const previousAstroConfigDigest = await this.#store.metaStore().get('astro-config-digest');
 		const previousAstroVersion = await this.#store.metaStore().get('astro-version');
+
+		if (astroConfigDigest && previousAstroConfigDigest !== astroConfigDigest) {
+			logger.info('Astro config changed');
+			shouldClear = true;
+		}
+
 		if (currentConfigDigest && previousConfigDigest !== currentConfigDigest) {
 			logger.info('Content config changed');
 			shouldClear = true;
@@ -165,7 +178,10 @@ 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]) => {

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));
+}

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 +299,19 @@ 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', () => {

packages/astro/test/fixtures/content-layer/astro.config.mjs

@@ -3,6 +3,7 @@ import { defineConfig } from 'astro/config';
 import { fileURLToPath } from 'node:url';
 
 export default defineConfig({
+	name: 'Astro content layer',
   integrations: [mdx(), {
 		name: '@astrojs/my-integration',
 		hooks: {