withastro · natemoo-re · Jan 4, 2023 · Jan 3, 2023 · Jan 3, 2023 · Jan 3, 2023
diff --git a/.changeset/lemon-eagles-worry.md b/.changeset/lemon-eagles-worry.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix `prerender` when used with `getStaticPaths`
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
@@ -1004,6 +1004,7 @@ export type AsyncRendererComponentFn<U> = (
 export interface ComponentInstance {
 	default: AstroComponentFactory;
 	css?: string[];
+	prerender?: boolean;
 	getStaticPaths?: (options: GetStaticPathsOptions) => GetStaticPathsResult;
 }
 

diff --git a/packages/astro/src/core/build/generate.ts b/packages/astro/src/core/build/generate.ts
@@ -181,7 +181,7 @@ async function getPathsForRoute(
 			route: pageData.route,
 			isValidate: false,
 			logging: opts.logging,
-			ssr: false,
+			ssr: opts.settings.config.output === 'server',
 		})
 			.then((_result) => {
 				const label = _result.staticPaths.length === 1 ? 'page' : 'pages';

diff --git a/packages/astro/src/core/build/vite-plugin-ssr.ts b/packages/astro/src/core/build/vite-plugin-ssr.ts
@@ -139,6 +139,8 @@ function buildManifest(
 	const joinBase = (pth: string) => (bareBase ? bareBase + '/' + pth : pth);
 
 	for (const pageData of eachPrerenderedPageData(internals)) {
+		if (!pageData.route.pathname) continue;
+
 		const outFolder = getOutFolder(
 			opts.settings.config,
 			pageData.route.pathname!,

diff --git a/packages/astro/src/core/errors/errors-data.ts b/packages/astro/src/core/errors/errors-data.ts
@@ -353,7 +353,7 @@ but ${plural ? 'none were.' : 'it was not.'} able to server-side render \`${comp
 			'`getStaticPaths()` function is required for dynamic routes. Make sure that you `export` a `getStaticPaths` function from your dynamic route.',
 		hint: `See https://docs.astro.build/en/core-concepts/routing/#dynamic-routes for more information on dynamic routes.
 
-Alternatively, set \`output: "server"\` in your Astro config file to switch to a non-static server build.
+Alternatively, set \`output: "server"\` in your Astro config file to switch to a non-static server build. This error can also occur if using \`export const prerender = true;\`.
 See https://docs.astro.build/en/guides/server-side-rendering/ for more information on non-static rendering.`,
 	},
 	/**

diff --git a/packages/astro/src/core/render/route-cache.ts b/packages/astro/src/core/render/route-cache.ts
@@ -31,7 +31,7 @@ export async function callGetStaticPaths({
 }: CallGetStaticPathsOptions): Promise<RouteCacheEntry> {
 	validateDynamicRouteModule(mod, { ssr, logging, route });
 	// No static paths in SSR mode. Return an empty RouteCacheEntry.
-	if (ssr) {
+	if (ssr && !mod.prerender) {
 		return { staticPaths: Object.assign([], { keyed: new Map() }) };
 	}
 	// Add a check here to make TypeScript happy.

diff --git a/packages/astro/src/core/routing/validation.ts b/packages/astro/src/core/routing/validation.ts
@@ -31,10 +31,10 @@ export function validateDynamicRouteModule(
 		route: RouteData;
 	}
 ) {
-	if (ssr && mod.getStaticPaths) {
+	if (ssr && mod.getStaticPaths && !mod.prerender) {
 		warn(logging, 'getStaticPaths', 'getStaticPaths() is ignored when "output: server" is set.');
 	}
-	if (!ssr && !mod.getStaticPaths) {
+	if ((!ssr || mod.prerender) && !mod.getStaticPaths) {
 		throw new AstroError({
 			...AstroErrorData.GetStaticPathsRequired,
 			location: { file: route.component },

diff --git a/packages/astro/test/fixtures/ssr-prerender-get-static-paths/package.json b/packages/astro/test/fixtures/ssr-prerender-get-static-paths/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "@test/ssr-prerender-get-static-paths",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "astro": "workspace:*"
+  }
+}
diff --git a/...s/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/[...calledTwiceTest].astro b/...s/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/[...calledTwiceTest].astro
@@ -0,0 +1,22 @@
+---
+export function getStaticPaths({ paginate }) {
+  if (globalThis.isCalledOnce) {
+    throw new Error("Can only be called once!");
+  }
+  globalThis.isCalledOnce = true;
+  return [
+    {params: {calledTwiceTest: 'a'}},
+    {params: {calledTwiceTest: 'b'}},
+    {params: {calledTwiceTest: 'c'}},
+  ];
+}
+export const prerender = true;
+const { params } = Astro;
+---
+
+<html>
+  <head>
+    <title>Page {params.calledTwiceTest}</title>
+  </head>
+  <body></body>
+</html>
diff --git a/...ges/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/blog/[year]/[slug].astro b/...ges/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/blog/[year]/[slug].astro
@@ -0,0 +1,19 @@
+---
+export async function getStaticPaths() {
+    return [
+        { params: { year: '2022', slug: 'post-1' } },
+        { params: { year: 2022, slug: 'post-2' } },
+        { params: { slug: 'post-2', year: '2022' } },
+    ]
+}
+
+export const prerender = true;
+const { year, slug } = Astro.params
+---
+
+<html>
+  <head>
+    <title>{year} | {slug}</title>
+  </head>
+  <body></body>
+</html>
diff --git a/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/data/[slug].json.ts b/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/data/[slug].json.ts
@@ -0,0 +1,16 @@
+export const prerender = true;
+
+export async function getStaticPaths() {
+    return [
+        { params: { slug: 'thing1' } },
+        { params: { slug: 'thing2' } }
+    ];
+}
+
+export async function get() {
+    return {
+        body: JSON.stringify({
+            title: '[slug]'
+        }, null, 4)
+    };
+}
diff --git a/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/food/[name].astro b/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/food/[name].astro
@@ -0,0 +1,34 @@
+---
+export async function getStaticPaths() {
+	return [
+		{
+			params: { name: 'tacos' },
+			props: { yum: 10 },
+		},
+		{
+			params: { name: 'potatoes' },
+			props: { yum: 7 },
+		},
+		{
+			params: { name: 'spaghetti' },
+			props: { yum: 5 },
+		}
+	]
+}
+
+export const prerender = true;
+
+const { yum } = Astro.props;
+---
+
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>Food</title>
+	</head>
+	<body>
+		<p id="url">{ Astro.url.pathname }</p>
+		<p id="props">{ yum }</p>
+	</body>
+</html>
diff --git a/...s/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/nested-arrays/[slug].astro b/...s/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/nested-arrays/[slug].astro
@@ -0,0 +1,10 @@
+---
+  export function getStaticPaths() {
+    return [
+      [ { params: {slug: "slug1"} } ],
+      [ { params: {slug: "slug2"} } ],
+    ]
+  }
+
+	export const prerender = true;
+---
diff --git a/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/pizza/[...pizza].astro b/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/pizza/[...pizza].astro
@@ -0,0 +1,23 @@
+---
+export function getStaticPaths() {
+	return [{
+		params: { pizza: 'papa-johns' },
+	}, {
+		params: { pizza: 'dominos' },
+  }, {
+		params: { pizza: 'grimaldis/new-york' },
+  }]
+}
+export const prerender = true;
+const { pizza } = Astro.params
+---
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>{pizza ?? 'The landing page'}</title>
+	</head>
+	<body>
+		<h1>Welcome to {pizza ?? 'The landing page'}</h1>
+	</body>
+</html>
diff --git a/...tro/test/fixtures/ssr-prerender-get-static-paths/src/pages/pizza/[cheese]-[topping].astro b/...tro/test/fixtures/ssr-prerender-get-static-paths/src/pages/pizza/[cheese]-[topping].astro
@@ -0,0 +1,22 @@
+---
+export function getStaticPaths() {
+	return [{
+		params: { cheese: 'mozzarella', topping: 'pepperoni' },
+	}, {
+		params: { cheese: 'provolone', topping: 'sausage' },
+  }]
+}
+export const prerender = true;
+const { cheese, topping } = Astro.params
+---
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>{cheese}</title>
+	</head>
+	<body>
+		<h1>🍕 It's pizza time</h1>
+		<p>{cheese}-{topping}</p>
+	</body>
+</html>
diff --git a/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/posts/[page].astro b/packages/astro/test/fixtures/ssr-prerender-get-static-paths/src/pages/posts/[page].astro
@@ -0,0 +1,30 @@
+---
+export async function getStaticPaths() {
+	return [
+		{
+			params: { page: 1 },
+		},
+		{
+			params: { page: 2 },
+		},
+		{
+			params: { page: 3 }
+		}
+	]
+};
+export const prerender = true;
+const { page } = Astro.params
+const canonicalURL = new URL(Astro.url.pathname, Astro.site);
+---
+
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>Posts Page {page}</title>
+		<link rel="canonical" href={canonicalURL.href}>
+	</head>
+	<body>
+		<h1>Welcome to page {page}</h1>
+	</body>
+</html>