modulepreload

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

@@ -212,11 +212,11 @@ export class App {
 				env: this.#pipeline.env,
 				mod: handler as any,
 			});
-		} else {
+		}
 			const pathname = prependForwardSlash(this.removeBase(url.pathname));
 			const info = this.#routeDataToRouteInfo.get(routeData)!;
 			// may be used in the future for handling rel=modulepreload, rel=icon, rel=manifest etc.
-			const links = new Set<never>();
+			const links = new Set(info.links.map(props => ({ props, children: '' })));
 			const styles = createStylesheetElementSet(info.styles);
 
 			let scripts = new Set<SSRElement>();
@@ -246,7 +246,6 @@ export class App {
 				env: this.#pipeline.env,
 			});
 	}
-	}
 
 	/**
 	 * If it is a known error code, try sending the according page (e.g. 404.astro / 500.astro).

packages/astro/src/core/app/types.ts

@@ -16,7 +16,10 @@ export type StylesheetAsset =
 export interface RouteInfo {
 	routeData: RouteData;
 	file: string;
-	links: string[];
+	links: Array<{
+		href: string
+		rel: 'modulepreload'
+	}>;
 	scripts: // Integration injected
 	(
 		| { children: string; stage: string }

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

@@ -261,7 +261,7 @@ async function generatePage(
 	const pageInfo = getPageDataByComponent(pipeline.getInternals(), pageData.route.component);
 
 	// may be used in the future for handling rel=modulepreload, rel=icon, rel=manifest etc.
-	const linkIds: [] = [];
+	const links = [...pageInfo?.preload.modules ?? []].map(href => ({ rel: 'modulepreload' as const, href }));
 	const scripts = pageInfo?.hoistedScript ?? null;
 	const styles = pageData.styles
 		.sort(cssOrder)
@@ -291,7 +291,7 @@ async function generatePage(
 
 	const generationOptions: Readonly<GeneratePathOptions> = {
 		pageData,
-		linkIds,
+		links,
 		scripts,
 		styles,
 		mod: pageModule,
@@ -425,7 +425,10 @@ function getInvalidRouteSegmentError(
 
 interface GeneratePathOptions {
 	pageData: PageBuildData;
-	linkIds: string[];
+	links: Array<{
+		rel: 'modulepreload'
+		href: string
+	}>;
 	scripts: { type: 'inline' | 'external'; value: string } | null;
 	styles: StylesheetAsset[];
 	mod: ComponentInstance;
@@ -490,7 +493,7 @@ function getUrlForPath(
 
 async function generatePath(pathname: string, gopts: GeneratePathOptions, pipeline: BuildPipeline) {
 	const manifest = pipeline.getManifest();
-	const { mod, scripts: hoistedScripts, styles: _styles, pageData } = gopts;
+	const { mod, links: _links, scripts: hoistedScripts, styles: _styles, pageData } = gopts;
 
 	// This adds the page name to the array so it can be shown as part of stats.
 	if (pageData.route.type === 'page') {
@@ -500,7 +503,7 @@ async function generatePath(pathname: string, gopts: GeneratePathOptions, pipeli
 	pipeline.getEnvironment().logger.debug('build', `Generating: ${pathname}`);
 
 	// may be used in the future for handling rel=modulepreload, rel=icon, rel=manifest etc.
-	const links = new Set<never>();
+	const links = new Set(_links.map(props => ({ props, children: '' })));
 	const scripts = createModuleScriptsSet(
 		hoistedScripts ? [hoistedScripts] : [],
 		manifest.base,

packages/astro/src/core/build/page-data.ts

@@ -55,6 +55,11 @@ export async function collectPagesData(
 				propagatedStyles: new Map(),
 				propagatedScripts: new Map(),
 				hoistedScript: undefined,
+				preload: {
+					modules: new Set,
+					fonts: new Set,
+					styles: new Set
+				},
 			};
 
 			clearInterval(routeCollectionLogTimeout);
@@ -78,6 +83,11 @@ export async function collectPagesData(
 			propagatedStyles: new Map(),
 			propagatedScripts: new Map(),
 			hoistedScript: undefined,
+			preload: {
+				modules: new Set,
+				fonts: new Set,
+				styles: new Set
+			},
 		};
 	}
 

packages/astro/src/core/build/plugins/plugin-hoisted-scripts.ts

@@ -67,14 +67,17 @@ export function vitePluginHoistedScripts(
 			});
 
 			for (const [id, output] of considerInlining.entries()) {
+				
 				const canBeInlined =
 					importedByOtherScripts.has(output.fileName) === false &&
 					output.imports.length === 0 &&
 					output.dynamicImports.length === 0 &&
 					Buffer.byteLength(output.code) <= assetInlineLimit;
+				
 				let removeFromBundle = false;
-				const facadeId = output.facadeModuleId!;
+				
-				const pages = internals.hoistedScriptIdToPagesMap.get(facadeId)!;
+				const pages = internals.hoistedScriptIdToPagesMap.get(output.facadeModuleId!)!;
+				
 				for (const pathname of pages) {
 					const vid = viteID(new URL('.' + pathname, settings.config.root));
 					const pageInfo = getPageDataByViteID(internals, vid);
@@ -91,6 +94,10 @@ export function vitePluginHoistedScripts(
 								value: id,
 							};
 						}
+						
+						for (const importedScript of output.imports) {
+							pageInfo.preload.modules.add(importedScript)
+						}
 					}
 				}
 

packages/astro/src/core/build/plugins/plugin-manifest.ts

@@ -210,7 +210,7 @@ function buildManifest(
 		}
 
 		// may be used in the future for handling rel=modulepreload, rel=icon, rel=manifest etc.
-		const links: [] = [];
+		const links = [...pageData.preload.modules].map(href => ({ rel: 'modulepreload' as const, href }));
 
 		const styles = pageData.styles
 			.sort(cssOrder)

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

@@ -25,6 +25,11 @@ export interface PageBuildData {
 	component: ComponentPath;
 	route: RouteData;
 	moduleSpecifier: string;
+	preload: {
+		modules: Set<string>
+		fonts: Set<string>
+		styles: Set<string>
+	};
 	propagatedStyles: Map<string, Set<StylesheetAsset>>;
 	propagatedScripts: Map<string, Set<string>>;
 	hoistedScript: { type: 'inline' | 'external'; value: string } | undefined;