[pull] main from withastro:main

.changeset/fix-large-static-build-promise-all.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes a build error when generating projects with 100k+ static routes.

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

@@ -153,22 +153,29 @@ export async function generatePages(
 	// Generate each path
 	if (config.build.concurrency > 1) {
 		const limit = PLimit(config.build.concurrency);
-		const promises: Promise<void>[] = [];
-		for (const { pathname, route } of filteredPaths) {
-			promises.push(
-				limit(() =>
-					generatePathWithPrerenderer(
-						prerenderer,
-						pathname,
-						route,
-						options,
-						routeToHeaders,
-						logger,
+		// Process in batches to avoid V8's Promise.all element limit, which is around ~123k items
+		//
+		// NOTE: ideally we could consider an iterator to avoid the batching limitation
+		const BATCH_SIZE = 100_000;
+		for (let i = 0; i < filteredPaths.length; i += BATCH_SIZE) {
+			const batch = filteredPaths.slice(i, i + BATCH_SIZE);
+			const promises: Promise<void>[] = [];
+			for (const { pathname, route } of batch) {
+				promises.push(
+					limit(() =>
+						generatePathWithPrerenderer(
+							prerenderer,
+							pathname,
+							route,
+							options,
+							routeToHeaders,
+							logger,
+						),
 					),
-				),
-			);
+				);
+			}
+			await Promise.all(promises);
 		}
-		await Promise.all(promises);
 	} else {
 		for (const { pathname, route } of filteredPaths) {
 			await generatePathWithPrerenderer(

packages/astro/src/types/public/config.ts

@@ -661,7 +661,8 @@ export interface AstroUserConfig<
 		 * This feature comes with some limitations:
 		 * - External scripts and external styles are not supported out of the box, but you can [provide your own hashes](https://v6.docs.astro.build/en/reference/configuration-reference/#hashes).
 		 * - [Astro's view transitions](https://v6.docs.astro.build/en/guides/view-transitions/) using the `<ClientRouter />` are not supported, but you can [consider migrating to the browser native View Transition API](https://events-3bg.pages.dev/jotter/astro-view-transitions/) instead if you are not using Astro's enhancements to the native View Transitions and Navigation APIs.
-		 * - Shiki isn't currently supported. By design, Shiki functions using inline styles.
+		 * - Shiki isn't currently supported. By design, Shiki functions use inline styles that cannot work with Astro CSP implementation. Consider [using `<Prism />`](https://v6.docs.astro.build/en/guides/syntax-highlighting/#prism-) when your project requires both CSP and syntax highlighting.
+		 * - `unsafe-inline` directives are incompatible with Astro's CSP implementation. By default, Astro will emit hashes for all its bundled scripts (e.g. client islands) and all modern browsers will automatically reject `unsafe-inline` when it occurs in a directive with a hash or nonce.
 		 *
 		 * :::note
 		 * Due to the nature of the Vite dev server, this feature isn't supported while working in `dev` mode. Instead, you can test this in your Astro project using `build` and `preview`.