fix: clear content layer cache if config has changed

packages/astro/src/content/data-store.ts

@@ -75,6 +75,11 @@ export class DataStore {
 		this.#saveToDiskDebounced();
 	}
 
+	clearAll() {
+		this.#collections.clear();
+		this.#saveToDiskDebounced();
+	}
+
 	has(collectionName: string, key: string) {
 		const collection = this.#collections.get(collectionName);
 		if (collection) {
@@ -227,8 +232,10 @@ export default new Map([${exports.join(', ')}]);
 				this.addAssetImports(assets, fileName),
 		};
 	}
-
-	metaStore(collectionName: string): MetaStore {
+	/**
+	 * Returns a MetaStore for a given collection, or if no collection is provided, the default meta collection.
+	 */
+	metaStore(collectionName = ':meta'): MetaStore {
 		const collectionKey = `meta:${collectionName}`;
 		return {
 			get: (key: string) => this.get(collectionKey, key),

packages/astro/src/content/sync.ts

@@ -38,6 +38,15 @@ export async function syncContentLayer({
 		logger.debug('Content config not loaded, skipping sync');
 		return;
 	}
+
+	const previousConfigDigest = await store.metaStore().get('config-digest');
+	const { digest: currentConfigDigest } = contentConfig.config;
+	if (currentConfigDigest && previousConfigDigest !== currentConfigDigest) {
+		logger.info('Content config changed, clearing cache');
+		store.clearAll();
+		await store.metaStore().set('config-digest', currentConfigDigest);
+	}
+
 	// xxhash is a very fast non-cryptographic hash function that is used to generate a content digest
 	// It uses wasm, so we need to load it asynchronously.
 	const { h64ToString } = await xxhash();

packages/astro/src/content/utils.ts

@@ -5,6 +5,7 @@ import { slug as githubSlug } from 'github-slugger';
 import matter from 'gray-matter';
 import type { PluginContext } from 'rollup';
 import { type ViteDevServer, normalizePath } from 'vite';
+import xxhash from 'xxhash-wasm';
 import { z } from 'zod';
 import type {
 	AstroConfig,
@@ -95,7 +96,7 @@ export const contentConfigParser = z.object({
 });
 
 export type CollectionConfig = z.infer<typeof collectionConfigParser>;
-export type ContentConfig = z.infer<typeof contentConfigParser>;
+export type ContentConfig = z.infer<typeof contentConfigParser> & { digest?: string };
 
 type EntryInternal = { rawData: string | undefined; filePath: string };
 
@@ -497,7 +498,10 @@ export async function loadContentConfig({
 
 	const config = contentConfigParser.safeParse(unparsedConfig);
 	if (config.success) {
-		return config.data;
+		// Generate a digest of the config file so we can invalidate the cache if it changes
+		const hasher = await xxhash();
+		const digest = await hasher.h64ToString(await fs.promises.readFile(configPathname, 'utf-8'));
+		return { ...config.data, digest };
 	} else {
 		return undefined;
 	}

packages/astro/src/content/vite-plugin-content-imports.ts

@@ -158,6 +158,7 @@ export const _internal = {
 
 						// The content config could depend on collection entries via `reference()`.
 						// Reload the config in case of changes.
+						// Changes to the config file itself are handled in types-generator.ts, so we skip them here
 						if (entryType === 'content' || entryType === 'data') {
 							await reloadContentConfigObserver({ fs, settings, viteServer });
 						}

packages/astro/src/core/build/index.ts

@@ -28,12 +28,12 @@ import { levels, timerMessage } from '../logger/core.js';
 import { apply as applyPolyfill } from '../polyfill.js';
 import { createRouteManifest } from '../routing/index.js';
 import { getServerIslandRouteData } from '../server-islands/endpoint.js';
+import { clearContentLayerCache } from '../sync/index.js';
 import { ensureProcessNodeEnv, isServerLikeOutput } from '../util.js';
 import { collectPagesData } from './page-data.js';
 import { staticBuild, viteBuild } from './static-build.js';
 import type { StaticBuildOptions } from './types.js';
 import { getTimeStat } from './util.js';
-import { clearContentLayerCache } from '../sync/index.js';
 export interface BuildOptions {
 	/**
 	 * Teardown the compiler WASM instance after build. This can improve performance when
@@ -43,7 +43,6 @@ export interface BuildOptions {
 	 * @default true
 	 */
 	teardownCompiler?: boolean;
-
 }
 
 /**

packages/astro/src/core/dev/dev.ts

@@ -10,6 +10,7 @@ import { DATA_STORE_FILE } from '../../content/consts.js';
 import { DataStore, globalDataStore } from '../../content/data-store.js';
 import { attachContentServerListeners } from '../../content/index.js';
 import { syncContentLayer } from '../../content/sync.js';
+import { globalContentConfigObserver } from '../../content/utils.js';
 import { telemetry } from '../../events/index.js';
 import * as msg from '../messages.js';
 import { ensureProcessNodeEnv } from '../util.js';
@@ -120,11 +121,36 @@ export default async function dev(inlineConfig: AstroInlineConfig): Promise<DevS
 		globalDataStore.set(store);
 	}
 
-	await syncContentLayer({
-		settings: restart.container.settings,
-		logger,
-		watcher: restart.container.viteServer.watcher,
-		store,
+	const config = globalContentConfigObserver.get();
+	let currentDigest: string | undefined = undefined;
+	// mutex to prevent multiple syncContentLayer calls
+	let loading = false;
+	if (config.status === 'loaded') {
+		currentDigest = config.config.digest;
+		loading = true;
+		await syncContentLayer({
+			settings: restart.container.settings,
+			logger,
+			watcher: restart.container.viteServer.watcher,
+			store,
+		}).finally(() => {
+			loading = false;
+		});
+	}
+
+	globalContentConfigObserver.subscribe(async (ctx) => {
+		if (!loading && ctx.status === 'loaded' && ctx.config.digest !== currentDigest) {
+			loading = true;
+			currentDigest = ctx.config.digest;
+			await syncContentLayer({
+				settings: restart.container.settings,
+				logger,
+				watcher: restart.container.viteServer.watcher,
+				store,
+			}).finally(() => {
+				loading = false;
+			});
+		}
 	});
 
 	logger.info(null, green('watching for file changes...'));

packages/astro/src/core/sync/index.ts

@@ -73,7 +73,11 @@ export default async function sync({
 /**
  * Clears the content layer and content collection cache, forcing a full rebuild.
  */
-export async function clearContentLayerCache({ astroConfig, logger, fs = fsMod }: { astroConfig: AstroConfig; logger: Logger, fs?: typeof fsMod }) {
+export async function clearContentLayerCache({
+	astroConfig,
+	logger,
+	fs = fsMod,
+}: { astroConfig: AstroConfig; logger: Logger; fs?: typeof fsMod }) {
 	const dataStore = new URL(DATA_STORE_FILE, astroConfig.cacheDir);
 	if (fs.existsSync(dataStore)) {
 		logger.debug('content', 'clearing data store');
@@ -93,9 +97,8 @@ export async function syncInternal({
 	fs = fsMod,
 	settings,
 	skip,
-	force
+	force,
 }: SyncOptions): Promise<void> {
-
 	if (force) {
 		await clearContentLayerCache({ astroConfig: settings.config, logger, fs });
 	}

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

@@ -152,6 +152,17 @@ describe('Content Layer', () => {
 			newJson = devalue.parse(await fixture.readFile('/collections.json'));
 			assert.equal(newJson.increment.data.lastValue, 1);
 		});
+
+		it('clears the store on new build if the 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) => {
+				return `${prev}\nexport const foo = 'bar';`;
+			});
+			await fixture.build();
+			newJson = devalue.parse(await fixture.readFile('/collections.json'));
+			assert.equal(newJson.increment.data.lastValue, 1);
+		});
 	});
 
 	describe('Dev', () => {

packages/astro/test/test-utils.js

@@ -278,7 +278,7 @@ export async function loadFixture(inlineConfig) {
 				typeof newContentsOrCallback === 'function'
 					? newContentsOrCallback(contents)
 					: newContentsOrCallback;
-			const nextChange = onNextChange();
+			const nextChange = devServer ? onNextChange() : Promise.resolve();
 			await fs.promises.writeFile(fileUrl, newContents);
 			await nextChange;
 			return reset;