refactor: generated .json to in-memory map

packages/astro/src/content/template/virtual-mod.mjs

@@ -28,9 +28,11 @@ const collectionToEntryMap = createCollectionToGlobResultMap({
 	contentDir,
 });
 
+let lookupMap = {};
+/* @@LOOKUP_MAP_ASSIGNMENT@@ */
+
 function createGlobLookup(glob) {
 	return async (collection, lookupId) => {
-		const { default: lookupMap } = await import('@@LOOKUP_MAP_PATH@@');
 		const filePath = lookupMap[collection]?.[lookupId];
 
 		if (!filePath) return undefined;

packages/astro/src/content/types-generator.ts

@@ -8,7 +8,7 @@ import type { AstroSettings, ContentEntryType } from '../@types/astro.js';
 import { AstroError, AstroErrorData } from '../core/errors/index.js';
 import { info, warn, type LogOptions } from '../core/logger/core.js';
 import { isRelativePath } from '../core/path.js';
-import { CONTENT_TYPES_FILE } from './consts.js';
+import { CONTENT_TYPES_FILE, VIRTUAL_MODULE_ID } from './consts.js';
 import {
 	getContentPaths,
 	getEntryInfo,
@@ -21,7 +21,6 @@ import {
 	type ContentObservable,
 	type ContentPaths,
 	type EntryInfo,
-	updateLookupMaps,
 	getContentEntryConfigByExtMap,
 } from './utils.js';
 
@@ -280,12 +279,7 @@ export async function createContentTypesGenerator({
 				contentConfig: observable.status === 'loaded' ? observable.config : undefined,
 				contentEntryTypes: settings.contentEntryTypes,
 			});
-			await updateLookupMaps({
-				contentEntryConfigByExt,
-				contentPaths,
-				root: settings.config.root,
-				fs,
-			});
+			invalidateVirtualMod(viteServer);
 			if (observable.status === 'loaded' && ['info', 'warn'].includes(logLevel)) {
 				warnNonexistentCollections({
 					logging,
@@ -298,6 +292,15 @@ export async function createContentTypesGenerator({
 	return { init, queueEvent };
 }
 
+// The virtual module contains a lookup map from slugs to content imports.
+// Invalidate whenever content types change.
+function invalidateVirtualMod(viteServer: ViteDevServer) {
+	const virtualMod = viteServer.moduleGraph.getModuleById('\0' + VIRTUAL_MODULE_ID);
+	if (!virtualMod) return;
+
+	viteServer.moduleGraph.invalidateModule(virtualMod);
+}
+
 function addCollection(contentMap: ContentTypes, collectionKey: string) {
 	contentMap[collectionKey] = {};
 }

packages/astro/src/content/utils.ts

@@ -388,7 +388,7 @@ function search(fs: typeof fsMod, srcDir: URL) {
 	return { exists: false, url: paths[0] };
 }
 
-export async function updateLookupMaps({
+export async function getStringifiedLookupMap({
 	contentPaths,
 	contentEntryConfigByExt,
 	root,
@@ -434,10 +434,7 @@ export async function updateLookupMaps({
 		filePathByLookupId[collection][slug] = rootRelativePath(root, filePath);
 	}
 
-	await fs.promises.writeFile(
-		new URL('lookup-map.json', contentPaths.cacheDir),
-		JSON.stringify(filePathByLookupId, null, 2)
-	);
+	return JSON.stringify(filePathByLookupId);
 }
 
 export function getExtGlob(exts: string[]) {

packages/astro/src/content/vite-plugin-content-virtual-mod.ts

@@ -2,7 +2,13 @@ import fsMod from 'node:fs';
 import type { Plugin } from 'vite';
 import type { AstroSettings } from '../@types/astro.js';
 import { VIRTUAL_MODULE_ID } from './consts.js';
-import { getContentEntryExts, getContentPaths, getExtGlob } from './utils.js';
+import {
+	getContentEntryConfigByExtMap,
+	getContentEntryExts,
+	getContentPaths,
+	getExtGlob,
+	getStringifiedLookupMap,
+} from './utils.js';
 import { rootRelativePath } from '../core/util.js';
 
 interface AstroContentVirtualModPluginParams {
@@ -14,17 +20,14 @@ export function astroContentVirtualModPlugin({
 }: AstroContentVirtualModPluginParams): Plugin {
 	const contentPaths = getContentPaths(settings.config);
 	const relContentDir = rootRelativePath(settings.config.root, contentPaths.contentDir);
-	const contentEntryExts = getContentEntryExts(settings);
 
-	const extGlob =
-		contentEntryExts.length === 1
-			? // Wrapping {...} breaks when there is only one extension
-			  contentEntryExts[0]
-			: `{${contentEntryExts.join(',')}}`;
+	const contentEntryConfigByExt = getContentEntryConfigByExtMap(settings);
+	const contentEntryExts = [...contentEntryConfigByExt.keys()];
+
+	const extGlob = getExtGlob(contentEntryExts);
 	const entryGlob = `${relContentDir}**/*${extGlob}`;
 	const virtualModContents = fsMod
 		.readFileSync(contentPaths.virtualModTemplate, 'utf-8')
-		.replace('@@LOOKUP_MAP_PATH@@', new URL('lookup-map.json', contentPaths.cacheDir).pathname)
 		.replace('@@CONTENT_DIR@@', relContentDir)
 		.replace('@@ENTRY_GLOB_PATH@@', entryGlob)
 		.replace('@@RENDER_ENTRY_GLOB_PATH@@', entryGlob);
@@ -39,10 +42,20 @@ export function astroContentVirtualModPlugin({
 				return astroContentVirtualModuleId;
 			}
 		},
-		load(id) {
+		async load(id) {
+			const stringifiedLookupMap = await getStringifiedLookupMap({
+				fs: fsMod,
+				contentPaths,
+				contentEntryConfigByExt,
+				root: settings.config.root,
+			});
+
 			if (id === astroContentVirtualModuleId) {
 				return {
-					code: virtualModContents,
+					code: virtualModContents.replace(
+						'/* @@LOOKUP_MAP_ASSIGNMENT@@ */',
+						`lookupMap = ${stringifiedLookupMap};`
+					),
 				};
 			}
 		},