Add support for the object notation in redirects

* Implement support for dynamic routes in redirects

* Remove the .only

* No need to special-case redirects in static build

.changeset/chatty-actors-stare.md

@@ -0,0 +1,6 @@
+---
+'@astrojs/netlify': minor
+'astro': minor
+---
+
+Implements the redirects proposal

packages/astro/src/@types/astro.ts

@@ -452,6 +452,11 @@ export interface AstroUserConfig {
 	 */
 	cacheDir?: string;
 
+	/**
+	 * TODO
+	 */
+	redirects?: Record<string, string>;
+
 	/**
 	 * @docs
 	 * @name site
@@ -1577,6 +1582,8 @@ export interface AstroAdapter {
 
 type Body = string;
 
+export type ValidRedirectStatus = 300 | 301 | 302 | 303 | 304 | 307 | 308;
+
 // Shared types between `Astro` global and API context object
 interface AstroSharedContext<Props extends Record<string, any> = Record<string, any>> {
 	/**
@@ -1606,7 +1613,7 @@ interface AstroSharedContext<Props extends Record<string, any> = Record<string,
 	/**
 	 * Redirect to another page (**SSR Only**).
 	 */
-	redirect(path: string, status?: 301 | 302 | 303 | 307 | 308): Response;
+	redirect(path: string, status?: ValidRedirectStatus): Response;
 
 	/**
 	 * Object accessed via Astro middleware
@@ -1821,7 +1828,7 @@ export interface AstroPluginOptions {
 	logging: LogOptions;
 }
 
-export type RouteType = 'page' | 'endpoint';
+export type RouteType = 'page' | 'endpoint' | 'redirect';
 
 export interface RoutePart {
 	content: string;
@@ -1829,6 +1836,11 @@ export interface RoutePart {
 	spread: boolean;
 }
 
+type RedirectConfig = string | {
+	status: ValidRedirectStatus;
+	destination: string;
+}
+
 export interface RouteData {
 	route: string;
 	component: string;
@@ -1841,6 +1853,12 @@ export interface RouteData {
 	segments: RoutePart[][];
 	type: RouteType;
 	prerender: boolean;
+	redirect?: RedirectConfig;
+	redirectRoute?: RouteData;
+}
+
+export type RedirectRouteData = RouteData & {
+	redirect: string;
 }
 
 export type SerializedRouteData = Omit<RouteData, 'generate' | 'pattern'> & {

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

@@ -26,6 +26,7 @@ export function getOutFolder(
 		case 'endpoint':
 			return new URL('.' + appendForwardSlash(npath.dirname(pathname)), outRoot);
 		case 'page':
+		case 'redirect':
 			switch (astroConfig.build.format) {
 				case 'directory': {
 					if (STATUS_CODE_PAGES.has(pathname)) {
@@ -51,6 +52,7 @@ export function getOutFile(
 		case 'endpoint':
 			return new URL(npath.basename(pathname), outFolder);
 		case 'page':
+		case 'redirect':
 			switch (astroConfig.build.format) {
 				case 'directory': {
 					if (STATUS_CODE_PAGES.has(pathname)) {

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

@@ -35,6 +35,7 @@ import { debug, info } from '../logger/core.js';
 import { callMiddleware } from '../middleware/callMiddleware.js';
 import { createEnvironment, createRenderContext, renderPage } from '../render/index.js';
 import { callGetStaticPaths } from '../render/route-cache.js';
+import { getRedirectLocationOrThrow, routeIsRedirect } from '../redirects/index.js';
 import {	
 	createAssetLink,
 	createModuleScriptsSet,
@@ -169,9 +170,16 @@ async function generatePage(
 		.map(({ sheet }) => sheet)
 		.reduce(mergeInlineCss, []);
 
-	const pageModulePromise = ssrEntry.pageMap?.get(pageData.component);
+	let pageModulePromise = ssrEntry.pageMap?.get(pageData.component);
 	const middleware = ssrEntry.middleware;
 
+	if (!pageModulePromise && routeIsRedirect(pageData.route)) {
+		if(pageData.route.redirectRoute) {
+			pageModulePromise = ssrEntry.pageMap?.get(pageData.route.redirectRoute!.component);
+		} else {
+			pageModulePromise = () => Promise.resolve<any>({ default: () => {} });
+		}
+	}
 	if (!pageModulePromise) {
 		throw new Error(
 			`Unable to find the module for ${pageData.component}. This is unexpected and likely a bug in Astro, please report.`
@@ -509,10 +517,25 @@ async function generatePath(
 			}
 			throw err;
 		}
-		throwIfRedirectNotAllowed(response, opts.settings.config);
-		// If there's no body, do nothing
-		if (!response.body) return;
-		body = await response.text();
+
+		switch(true) {
+			case (response.status >= 300 && response.status < 400): {
+				const location = getRedirectLocationOrThrow(response.headers);
+				body = `<!doctype html>
+<title>Redirecting to: ${location}</title>
+<meta http-equiv="refresh" content="0;url=${location}" />`;
+				// A dynamic redirect, set the location so that integrations know about it.
+				if(pageData.route.type !== 'redirect') {
+					pageData.route.redirect = location;
+				}
+				break;
+			}
+			default: {
+				// If there's no body, do nothing
+				if (!response.body) return;
+				body = await response.text();
+			}
+		}
 	}
 
 	const outFolder = getOutFolder(settings.config, pathname, pageData.route.type);

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

@@ -5,6 +5,7 @@ import { eachPageData, type BuildInternals } from '../internal.js';
 import type { AstroBuildPlugin } from '../plugin';
 import type { StaticBuildOptions } from '../types';
 import { MIDDLEWARE_MODULE_ID } from './plugin-middleware.js';
+import { routeIsRedirect } from '../../redirects/index.js';
 
 function vitePluginPages(opts: StaticBuildOptions, internals: BuildInternals): VitePlugin {
 	return {
@@ -28,6 +29,9 @@ function vitePluginPages(opts: StaticBuildOptions, internals: BuildInternals): V
 				let imports = [];
 				let i = 0;
 				for (const pageData of eachPageData(internals)) {
+					if(routeIsRedirect(pageData.route)) {
+						continue;
+					}
 					const variable = `_page${i}`;
 					imports.push(
 						`const ${variable} = () => import(${JSON.stringify(pageData.moduleSpecifier)});`

packages/astro/src/core/config/schema.ts

@@ -37,6 +37,7 @@ const ASTRO_CONFIG_DEFAULTS: AstroUserConfig & any = {
 	},
 	vite: {},
 	legacy: {},
+	redirects: {},
 	experimental: {
 		assets: false,
 		hybridOutput: false,
@@ -137,6 +138,7 @@ export const AstroConfigSchema = z.object({
 			.optional()
 			.default({})
 	),
+	redirects: z.record(z.string(), z.string()).default(ASTRO_CONFIG_DEFAULTS.redirects),
 	image: z
 		.object({
 			service: z.object({

packages/astro/src/core/errors/errors-data.ts

@@ -43,6 +43,7 @@ export const AstroErrorData = {
 	 * The `Astro.redirect` function is only available when [Server-side rendering](/en/guides/server-side-rendering/) is enabled.
 	 *
 	 * To redirect on a static website, the [meta refresh attribute](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta) can be used. Certain hosts also provide config-based redirects (ex: [Netlify redirects](https://docs.netlify.com/routing/redirects/)).
+	 * @deprecated since version 2.6
 	 */
 	StaticRedirectNotAvailable: {
 		title: '`Astro.redirect` is not available in static mode.',
@@ -719,6 +720,18 @@ See https://docs.astro.build/en/guides/server-side-rendering/ for more informati
 			return `The information stored in \`Astro.locals\` for the path "${href}" is not serializable.\nMake sure you store only serializable data.`;
 		},
 	},
+	/**
+		 * @docs
+		 * @see
+		 * - [Astro.redirect](https://docs.astro.build/en/guides/server-side-rendering/#astroredirect)
+		 * @description
+		 * A redirect must be given a location with the `Location` header.
+		 */
+	RedirectWithNoLocation: {
+		// TODO remove
+		title: 'A redirect must be given a location with the `Location` header.',
+		code: 3035,
+	},
 	// No headings here, that way Vite errors are merged with Astro ones in the docs, which makes more sense to users.
 	// Vite Errors - 4xxx
 	/**

packages/astro/src/core/redirects/helpers.ts

@@ -0,0 +1,27 @@
+import type { RouteData, RedirectRouteData, Params, ValidRedirectStatus } from '../../@types/astro';
+
+export function routeIsRedirect(route: RouteData | undefined): route is RedirectRouteData {
+	return route?.type === 'redirect';
+}
+
+export function redirectRouteGenerate(redirectRoute: RouteData, data: Params): string {
+	const routeData = redirectRoute.redirectRoute;
+	const route = redirectRoute.redirect;
+
+	if(typeof routeData !== 'undefined') {
+		return routeData?.generate(data) || routeData?.pathname || '/';
+	} else if(typeof route === 'string') {
+		return route;
+	} else if(typeof route === 'undefined') {
+		return '/';
+	}
+	return route.destination;
+}
+
+export function redirectRouteStatus(redirectRoute: RouteData): ValidRedirectStatus {
+	const routeData = redirectRoute.redirectRoute;
+	if(typeof routeData?.redirect === 'object') {
+		return routeData.redirect.status;
+	}
+	return 301;
+}

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

@@ -0,0 +1,2 @@
+export { getRedirectLocationOrThrow } from './validate.js';
+export { routeIsRedirect, redirectRouteGenerate, redirectRouteStatus } from './helpers.js';

packages/astro/src/core/redirects/validate.ts

@@ -0,0 +1,13 @@
+import { AstroError, AstroErrorData } from '../errors/index.js';
+
+export function getRedirectLocationOrThrow(headers: Headers): string {
+	let location = headers.get('location');
+
+	if(!location) {
+		throw new AstroError({
+			...AstroErrorData.RedirectWithNoLocation
+		});
+	}
+
+	return location;
+}

packages/astro/src/core/render/core.ts

@@ -8,6 +8,7 @@ import type { RenderContext } from './context.js';
 import type { Environment } from './environment.js';
 import { createResult } from './result.js';
 import { callGetStaticPaths, findPathItemByKey, RouteCache } from './route-cache.js';
+import { routeIsRedirect, redirectRouteGenerate, redirectRouteStatus } from '../redirects/index.js';
 
 interface GetParamsAndPropsOptions {
 	mod: ComponentInstance;
@@ -111,6 +112,15 @@ export type RenderPage = {
 };
 
 export async function renderPage({ mod, renderContext, env, apiContext }: RenderPage) {
+	if(routeIsRedirect(renderContext.route)) {
+		return new Response(null, {
+			status: redirectRouteStatus(renderContext.route),
+			headers: {
+				location: redirectRouteGenerate(renderContext.route, renderContext.params)
+			}
+		});
+	}
+
 	// Validate the page component before rendering the page
 	const Component = mod.default;
 	if (!Component)

packages/astro/src/core/render/result.ts

@@ -206,23 +206,21 @@ export function createResult(args: CreateResultArgs): SSRResult {
 				locals,
 				request,
 				url,
-				redirect: args.ssr
-					? (path, status) => {
-							// If the response is already sent, error as we cannot proceed with the redirect.
-							if ((request as any)[responseSentSymbol]) {
-								throw new AstroError({
-									...AstroErrorData.ResponseSentError,
-								});
-							}
+				redirect(path, status) {
+					// If the response is already sent, error as we cannot proceed with the redirect.
+					if ((request as any)[responseSentSymbol]) {
+						throw new AstroError({
+							...AstroErrorData.ResponseSentError,
+						});
+					}
 
-							return new Response(null, {
-								status: status || 302,
-								headers: {
-									Location: path,
-								},
-							});
-					  }
-					: onlyAvailableInSSR('Astro.redirect'),
+					return new Response(null, {
+						status: status || 302,
+						headers: {
+							Location: path,
+						},
+					});
+				},
 				response: response as AstroGlobal['response'],
 				slots: astroSlots as unknown as AstroGlobal['slots'],
 			};

packages/astro/src/core/routing/manifest/create.ts

@@ -420,6 +420,47 @@ export function createRouteManifest(
 			});
 		});
 
+	Object.entries(settings.config.redirects).forEach(([from, to]) => {
+		const trailingSlash = config.trailingSlash;
+
+		const segments = removeLeadingForwardSlash(from)
+		.split(path.posix.sep)
+		.filter(Boolean)
+		.map((s: string) => {
+			validateSegment(s);
+			return getParts(s, from);
+		});
+
+		const pattern = getPattern(segments, settings.config.base, trailingSlash);
+		const generate = getRouteGenerator(segments, trailingSlash);
+		const pathname = segments.every((segment) => segment.length === 1 && !segment[0].dynamic)
+			? `/${segments.map((segment) => segment[0].content).join('/')}`
+			: null;
+		const params = segments
+			.flat()
+			.filter((p) => p.dynamic)
+			.map((p) => p.content);
+		const route = `/${segments
+			.map(([{ dynamic, content }]) => (dynamic ? `[${content}]` : content))
+			.join('/')}`.toLowerCase();
+
+		
+
+		routes.unshift({
+			type: 'redirect',
+			route,
+			pattern,
+			segments,
+			params,
+			component: from,
+			generate,
+			pathname: pathname || void 0,
+			prerender: false,
+			redirect: to,
+			redirectRoute: routes.find(r => r.route === to)
+		});
+	});
+
 	return {
 		routes,
 	};

packages/astro/src/runtime/server/render/common.ts

@@ -57,6 +57,12 @@ export function stringifyChunk(
 				}
 				return renderAllHeadContent(result);
 			}
+			default: {
+				if(chunk instanceof Response) {
+					return '';
+				}
+				throw new Error(`Unknown chunk type: ${(chunk as any).type}`);
+			}
 		}
 	} else {
 		if (isSlotString(chunk as string)) {
@@ -102,6 +108,7 @@ export function chunkToByteArray(
 	if (chunk instanceof Uint8Array) {
 		return chunk as Uint8Array;
 	}
+	
 	// stringify chunk might return a HTMLString
 	let stringified = stringifyChunk(result, chunk);
 	return encoder.encode(stringified.toString());

packages/astro/test/fixtures/ssr-redirect/src/pages/articles/[...slug].astro

@@ -0,0 +1,25 @@
+---
+export const getStaticPaths = (async () => {
+  const posts = [
+		{ slug: 'one', data: {draft: false, title: 'One'} },
+		{ slug: 'two', data: {draft: false, title: 'Two'} }
+	];
+  return posts.map((post) => {
+    return {
+      params: { slug: post.slug },
+      props: { draft: post.data.draft, title: post.data.title },
+    };
+  });
+})
+
+const { slug } = Astro.params;
+const { title } = Astro.props;
+---
+<html>
+	<head>
+		<title>{ title }</title>
+	</head>
+	<body>
+		<h1>{ title }</h1>
+	</body>
+</html>

packages/astro/test/fixtures/ssr-redirect/src/pages/index.astro

@@ -0,0 +1,10 @@
+---
+---
+<html>
+	<head>
+		<title>Testing</title>
+	</head>
+	<body>
+		<h1>Testing</h1>
+	</body>
+</html>

packages/astro/test/fixtures/ssr-redirect/src/pages/late.astro

@@ -1,5 +1,6 @@
 ---
 import Redirect from '../components/redirect.astro';
+const staticMode = import.meta.env.STATIC_MODE;
 ---
 <html>
 	<head>
@@ -7,6 +8,8 @@ import Redirect from '../components/redirect.astro';
 	</head>
 	<body>
 		<h1>Testing</h1>
-		<Redirect />
+		{ !staticMode ? (
+			<Redirect />
+		) : <div></div>}
 	</body>
 </html>

packages/astro/test/redirects.test.js

@@ -0,0 +1,91 @@
+import { expect } from 'chai';
+import { loadFixture } from './test-utils.js';
+import testAdapter from './test-adapter.js';
+
+describe('Astro.redirect', () => {
+	/** @type {import('./test-utils').Fixture} */
+	let fixture;
+
+	describe('output: "server"', () => {
+		before(async () => {
+			fixture = await loadFixture({
+				root: './fixtures/ssr-redirect/',
+				output: 'server',
+				adapter: testAdapter(),
+			});
+			await fixture.build();
+		});
+	
+		it('Returns a 302 status', async () => {
+			const app = await fixture.loadTestAdapterApp();
+			const request = new Request('http://example.com/secret');
+			const response = await app.render(request);
+			expect(response.status).to.equal(302);
+			expect(response.headers.get('location')).to.equal('/login');
+		});
+	
+		it('Warns when used inside a component', async () => {
+			const app = await fixture.loadTestAdapterApp();
+			const request = new Request('http://example.com/late');
+			const response = await app.render(request);
+			try {
+				await response.text();
+				expect(false).to.equal(true);
+			} catch (e) {
+				expect(e.message).to.equal(
+					'The response has already been sent to the browser and cannot be altered.'
+				);
+			}
+		});
+	});
+
+	describe('output: "static"', () => {
+		before(async () => {
+			process.env.STATIC_MODE = true;
+			fixture = await loadFixture({
+				root: './fixtures/ssr-redirect/',
+				output: 'static',
+				redirects: {
+					'/one': '/',
+					'/two': '/',
+					'/blog/[...slug]': '/articles/[...slug]',
+					'/three': {
+						status: 302,
+						destination: '/'
+					}
+				}
+			});
+			await fixture.build();
+		});
+	
+		it('Includes the meta refresh tag in Astro.redirect pages', async () => {
+			const html = await fixture.readFile('/secret/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/login');
+		});
+
+		it('Includes the meta refresh tag in `redirect` config pages', async () => {
+			let html = await fixture.readFile('/one/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/');
+
+			html = await fixture.readFile('/two/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/');
+
+			html = await fixture.readFile('/three/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/');
+		});
+
+		it('Generates page for dynamic routes', async () => {
+			let html = await fixture.readFile('/blog/one/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/articles/one');
+
+			html = await fixture.readFile('/blog/two/index.html');
+			expect(html).to.include('http-equiv="refresh');
+			expect(html).to.include('url=/articles/two');
+		});
+	});
+});

packages/astro/test/ssr-redirect.test.js

@@ -1,39 +0,0 @@
-import { expect } from 'chai';
-import { loadFixture } from './test-utils.js';
-import testAdapter from './test-adapter.js';
-
-describe('Astro.redirect', () => {
-	/** @type {import('./test-utils').Fixture} */
-	let fixture;
-
-	before(async () => {
-		fixture = await loadFixture({
-			root: './fixtures/ssr-redirect/',
-			output: 'server',
-			adapter: testAdapter(),
-		});
-		await fixture.build();
-	});
-
-	it('Returns a 302 status', async () => {
-		const app = await fixture.loadTestAdapterApp();
-		const request = new Request('http://example.com/secret');
-		const response = await app.render(request);
-		expect(response.status).to.equal(302);
-		expect(response.headers.get('location')).to.equal('/login');
-	});
-
-	it('Warns when used inside a component', async () => {
-		const app = await fixture.loadTestAdapterApp();
-		const request = new Request('http://example.com/late');
-		const response = await app.render(request);
-		try {
-			const text = await response.text();
-			expect(false).to.equal(true);
-		} catch (e) {
-			expect(e.message).to.equal(
-				'The response has already been sent to the browser and cannot be altered.'
-			);
-		}
-	});
-});

packages/integrations/netlify/src/index.ts

@@ -1,2 +1,3 @@
 export { netlifyEdgeFunctions } from './integration-edge-functions.js';
 export { netlifyFunctions as default, netlifyFunctions } from './integration-functions.js';
+export { netlifyStatic } from './integration-static.js';

packages/integrations/netlify/src/integration-static.ts

@@ -0,0 +1,18 @@
+import type { AstroAdapter, AstroConfig, AstroIntegration, RouteData } from 'astro';
+import type { Args } from './netlify-functions.js';
+import { createRedirects } from './shared.js';
+
+export function netlifyStatic(): AstroIntegration {
+	let _config: any;
+	return {
+		name: '@astrojs/netlify',
+		hooks: {
+			'astro:config:done': ({ config }) => {
+				_config = config;
+			},
+			'astro:build:done': async ({ dir, routes }) => {
+				await createRedirects(_config, routes, dir, '', 'static');
+			}
+		}
+	};
+}

packages/integrations/netlify/src/shared.ts

@@ -1,20 +1,27 @@
-import type { AstroConfig, RouteData } from 'astro';
+import type { AstroConfig, RouteData, ValidRedirectStatus } from 'astro';
 import fs from 'fs';
 
-type RedirectDefinition = {
+export type RedirectDefinition = {
 	dynamic: boolean;
 	input: string;
 	target: string;
 	weight: 0 | 1;
-	status: 200 | 404;
+	status: 200 | 404 | ValidRedirectStatus;
 };
 
+function getRedirectStatus(route: RouteData): ValidRedirectStatus {
+	if(typeof route.redirect === 'object') {
+		return route.redirect.status;
+	}
+	return 301;
+}
+
 export async function createRedirects(
 	config: AstroConfig,
 	routes: RouteData[],
 	dir: URL,
 	entryFile: string,
-	type: 'functions' | 'edge-functions' | 'builders'
+	type: 'functions' | 'edge-functions' | 'builders' | 'static'
 ) {
 	const _redirectsURL = new URL('./_redirects', dir);
 	const kind = type ?? 'functions';
@@ -23,7 +30,21 @@ export async function createRedirects(
 
 	for (const route of routes) {
 		if (route.pathname) {
-			if (route.distURL) {
+			if(route.redirect) {
+				definitions.push({
+					dynamic: false,
+					input: route.pathname,
+					target: typeof route.redirect === 'object' ? route.redirect.destination : route.redirect,
+					status: getRedirectStatus(route),
+					weight: 1
+				});
+				continue;
+			}
+
+			if(kind === 'static') {
+				continue;
+			}
+			else if (route.distURL) {
 				definitions.push({
 					dynamic: false,
 					input: route.pathname,
@@ -51,31 +72,18 @@ export async function createRedirects(
 				}
 			}
 		} else {
-			const pattern =
-				'/' +
-				route.segments
-					.map(([part]) => {
-						//(part.dynamic ? '*' : part.content)
-						if (part.dynamic) {
-							if (part.spread) {
-								return '*';
-							} else {
-								return ':' + part.content;
-							}
-						} else {
-							return part.content;
-						}
-					})
-					.join('/');
+			const pattern = generateDynamicPattern(route);
 
 			if (route.distURL) {
+				const targetRoute = route.redirectRoute ?? route;
+				const targetPattern = generateDynamicPattern(targetRoute);
 				const target =
-					`${pattern}` + (config.build.format === 'directory' ? '/index.html' : '.html');
+					`${targetPattern}` + (config.build.format === 'directory' ? '/index.html' : '.html');
 				definitions.push({
 					dynamic: true,
 					input: pattern,
 					target,
-					status: 200,
+					status: route.type === 'redirect' ? 301 : 200,
 					weight: 1,
 				});
 			} else {
@@ -98,9 +106,29 @@ export async function createRedirects(
 	await fs.promises.appendFile(_redirectsURL, _redirects, 'utf-8');
 }
 
+function generateDynamicPattern(route: RouteData) {
+	const pattern =
+		'/' +
+		route.segments
+			.map(([part]) => {
+				//(part.dynamic ? '*' : part.content)
+				if (part.dynamic) {
+					if (part.spread) {
+						return '*';
+					} else {
+						return ':' + part.content;
+					}
+				} else {
+					return part.content;
+				}
+			})
+			.join('/');
+	return pattern;
+}
+
 function prettify(definitions: RedirectDefinition[]) {
-	let minInputLength = 0,
-		minTargetLength = 0;
+	let minInputLength = 4,
+		minTargetLength = 4;
 	definitions.sort((a, b) => {
 		// Find the longest input, so we can format things nicely
 		if (a.input.length > minInputLength) {

packages/integrations/netlify/test/functions/redirects.test.js

@@ -0,0 +1,42 @@
+import { expect } from 'chai';
+import { load as cheerioLoad } from 'cheerio';
+import { loadFixture, testIntegration } from './test-utils.js';
+import netlifyAdapter from '../../dist/index.js';
+import { fileURLToPath } from 'url';
+
+describe('SSG - Redirects', () => {
+	/** @type {import('../../../astro/test/test-utils').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('../static/fixtures/redirects/', import.meta.url).toString(),
+			output: 'server',
+			adapter: netlifyAdapter({
+				dist: new URL('../static/fixtures/redirects/dist/', import.meta.url),
+			}),
+			site: `http://example.com`,
+			integrations: [testIntegration()],
+			redirects: {
+				'/other': '/'
+			}
+		});
+		await fixture.build();
+	});
+
+	it('Creates a redirects file', async () => {
+		let redirects = await fixture.readFile('/_redirects');
+		let parts = redirects.split(/\s+/);
+		expect(parts).to.deep.equal([
+			'/other', '/', '301',
+			'/', '/.netlify/functions/entry', '200',
+
+			// This uses the dynamic Astro.redirect, so we don't know that it's a redirect
+			// until runtime. This is correct!
+			'/nope', '/.netlify/functions/entry', '200',
+
+			// A real route
+			'/team/articles/*', '/.netlify/functions/entry', '200',
+		]);
+	});
+});

packages/integrations/netlify/test/static/fixtures/redirects/src/pages/index.astro

@@ -0,0 +1,6 @@
+<html>
+<head><title>Testing</title></head>
+<body>
+	<h1>Testing</h1>
+</body>
+</html>

packages/integrations/netlify/test/static/fixtures/redirects/src/pages/nope.astro

@@ -0,0 +1,3 @@
+---
+return Astro.redirect('/');
+---

packages/integrations/netlify/test/static/fixtures/redirects/src/pages/team/articles/[...slug].astro

@@ -0,0 +1,25 @@
+---
+export const getStaticPaths = (async () => {
+  const posts = [
+		{ slug: 'one', data: {draft: false, title: 'One'} },
+		{ slug: 'two', data: {draft: false, title: 'Two'} }
+	];
+  return posts.map((post) => {
+    return {
+      params: { slug: post.slug },
+      props: { draft: post.data.draft, title: post.data.title },
+    };
+  });
+})
+
+const { slug } = Astro.params;
+const { title } = Astro.props;
+---
+<html>
+	<head>
+		<title>{ title }</title>
+	</head>
+	<body>
+		<h1>{ title }</h1>
+	</body>
+</html>

packages/integrations/netlify/test/static/redirects.test.js

@@ -0,0 +1,39 @@
+import { expect } from 'chai';
+import { loadFixture, testIntegration } from './test-utils.js';
+import { netlifyStatic } from '../../dist/index.js';
+
+describe('SSG - Redirects', () => {
+	/** @type {import('../../../astro/test/test-utils').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/redirects/', import.meta.url).toString(),
+			output: 'static',
+			adapter: netlifyStatic(),
+			site: `http://example.com`,
+			integrations: [testIntegration()],
+			redirects: {
+				'/other': '/',
+				'/two': {
+					status: 302,
+					destination: '/'
+				},
+				'/blog/[...slug]': '/team/articles/[...slug]'
+			}
+		});
+		await fixture.build();
+	});
+
+	it('Creates a redirects file', async () => {
+		let redirects = await fixture.readFile('/_redirects');
+		let parts = redirects.split(/\s+/);
+		expect(parts).to.deep.equal([
+			'/blog/*', '/team/articles/*/index.html', '301',
+			'/two', '/', '302',
+			'/other', '/', '301',
+			'/nope', '/', '301',
+			'/team/articles/*', '/team/articles/*/index.html', '200'
+		]);
+	});
+});

packages/integrations/netlify/test/static/test-utils.js

@@ -0,0 +1,29 @@
+// @ts-check
+import { fileURLToPath } from 'url';
+
+export * from '../../../../astro/test/test-utils.js';
+
+/**
+ *
+ * @returns {import('../../../../astro/dist/types/@types/astro').AstroIntegration}
+ */
+export function testIntegration() {
+	return {
+		name: '@astrojs/netlify/test-integration',
+		hooks: {
+			'astro:config:setup': ({ updateConfig }) => {
+				updateConfig({
+					vite: {
+						resolve: {
+							alias: {
+								'@astrojs/netlify/netlify-functions.js': fileURLToPath(
+									new URL('../../dist/netlify-functions.js', import.meta.url)
+								),
+							},
+						},
+					},
+				});
+			},
+		},
+	};
+}

packages/integrations/vercel/src/lib/redirects.ts

@@ -1,4 +1,7 @@
 import type { AstroConfig, RouteData, RoutePart } from 'astro';
+import nodePath from 'node:path';
+
+const pathJoin = nodePath.posix.join;
 
 // https://vercel.com/docs/project-configuration#legacy/routes
 interface VercelRoute {
@@ -36,6 +39,10 @@ function getMatchPattern(segments: RoutePart[][]) {
 		.join('');
 }
 
+function appendTrailingSlash(route: string): string {
+	return route.at(-1) === '/' ? route : route + '/';
+}
+
 function getReplacePattern(segments: RoutePart[][]) {
 	let n = 0;
 	let result = '';
@@ -54,28 +61,51 @@ function getReplacePattern(segments: RoutePart[][]) {
 	return result;
 }
 
+function getRedirectLocation(route: RouteData, config: AstroConfig): string {
+	if(route.redirectRoute) {
+		const pattern = getReplacePattern(route.redirectRoute.segments);
+		const path = (config.trailingSlash === 'always' ? appendTrailingSlash(pattern) : pattern);
+		return pathJoin(config.base, path);
+	} else if(typeof route.redirect === 'object') {
+		return pathJoin(config.base, route.redirect.destination);
+	} else {
+		return pathJoin(config.base, route.redirect || '');
+	}	
+}
+
+function getRedirectStatus(route: RouteData): number {
+	if(typeof route.redirect === 'object') {
+		return route.redirect.status;
+	}
+	return 301;
+}
+
 export function getRedirects(routes: RouteData[], config: AstroConfig): VercelRoute[] {
 	let redirects: VercelRoute[] = [];
 
-	if (config.trailingSlash === 'always') {
-		for (const route of routes) {
-			if (route.type !== 'page' || route.segments.length === 0) continue;
 
+
+	for(const route of routes) {
+		if(route.type === 'redirect') {
 			redirects.push({
 				src: config.base + getMatchPattern(route.segments),
-				headers: { Location: config.base + getReplacePattern(route.segments) + '/' },
-				status: 308,
-			});
-		}
-	} else if (config.trailingSlash === 'never') {
-		for (const route of routes) {
-			if (route.type !== 'page' || route.segments.length === 0) continue;
-
-			redirects.push({
-				src: config.base + getMatchPattern(route.segments) + '/',
-				headers: { Location: config.base + getReplacePattern(route.segments) },
-				status: 308,
+				headers: { Location: getRedirectLocation(route, config) },
+				status: getRedirectStatus(route)
 			});
+		} else if (route.type === 'page') {
+			if (config.trailingSlash === 'always') {
+				redirects.push({
+					src: config.base + getMatchPattern(route.segments),
+					headers: { Location: config.base + getReplacePattern(route.segments) + '/' },
+					status: 308,
+				});
+			} else if (config.trailingSlash === 'never') {
+				redirects.push({
+					src: config.base + getMatchPattern(route.segments) + '/',
+					headers: { Location: config.base + getReplacePattern(route.segments) },
+					status: 308,
+				});
+			}
 		}
 	}
 

packages/integrations/vercel/test/fixtures/redirects/astro.config.mjs

@@ -0,0 +1,9 @@
+import vercel from '@astrojs/vercel/static';
+import { defineConfig } from 'astro/config';
+
+export default defineConfig({
+	adapter: vercel({imageService: true}),
+	experimental: {
+		assets: true
+	}
+});

packages/integrations/vercel/test/fixtures/redirects/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "@test/astro-vercel-redirects",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@astrojs/vercel": "workspace:*",
+    "astro": "workspace:*"
+  }
+}

packages/integrations/vercel/test/fixtures/redirects/src/pages/index.astro

@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>Testing</title>
+	</head>
+	<body>
+		<h1>Testing</h1>
+	</body>
+</html>

packages/integrations/vercel/test/fixtures/redirects/src/pages/team/articles/[...slug].astro

@@ -0,0 +1,25 @@
+---
+export const getStaticPaths = (async () => {
+  const posts = [
+		{ slug: 'one', data: {draft: false, title: 'One'} },
+		{ slug: 'two', data: {draft: false, title: 'Two'} }
+	];
+  return posts.map((post) => {
+    return {
+      params: { slug: post.slug },
+      props: { draft: post.data.draft, title: post.data.title },
+    };
+  });
+})
+
+const { slug } = Astro.params;
+const { title } = Astro.props;
+---
+<html>
+	<head>
+		<title>{ title }</title>
+	</head>
+	<body>
+		<h1>{ title }</h1>
+	</body>
+</html>

packages/integrations/vercel/test/redirects.test.js

@@ -0,0 +1,56 @@
+import { expect } from 'chai';
+import * as cheerio from 'cheerio';
+import { loadFixture } from './test-utils.js';
+
+describe('Redirects', () => {
+	/** @type {import('../../../astro/test/test-utils.js').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: './fixtures/redirects/',
+			redirects: {
+				'/one': '/',
+				'/two': '/',
+				'/three': {
+					status: 302,
+					destination: '/'
+				},
+				'/blog/[...slug]': '/team/articles/[...slug]',
+			}
+		});
+		await fixture.build();
+	});
+
+	async function getConfig() {
+		const json = await fixture.readFile('../.vercel/output/config.json');
+		const config = JSON.parse(json);
+
+		return config;
+	}
+
+	it('define static routes', async () => {
+		const config = await getConfig();
+
+		const oneRoute = config.routes.find(r => r.src === '/\\/one');
+		expect(oneRoute.headers.Location).to.equal('/');
+		expect(oneRoute.status).to.equal(301);
+		
+		const twoRoute = config.routes.find(r => r.src === '/\\/two');
+		expect(twoRoute.headers.Location).to.equal('/');
+		expect(twoRoute.status).to.equal(301);
+
+		const threeRoute = config.routes.find(r => r.src === '/\\/three');
+		expect(threeRoute.headers.Location).to.equal('/');
+		expect(threeRoute.status).to.equal(302);
+	});
+
+	it('defines dynamic routes', async () => {
+		const config = await getConfig();
+
+		const blogRoute = config.routes.find(r => r.src.startsWith('/\\/blog'));
+		expect(blogRoute).to.not.be.undefined;
+		expect(blogRoute.headers.Location.startsWith('/team/articles')).to.equal(true);
+		expect(blogRoute.status).to.equal(301);
+	});
+});

pnpm-lock.yaml

@@ -4868,6 +4868,15 @@ importers:
         specifier: workspace:*
         version: link:../../../../../astro
 
+  packages/integrations/vercel/test/fixtures/redirects:
+    dependencies:
+      '@astrojs/vercel':
+        specifier: workspace:*
+        version: link:../../..
+      astro:
+        specifier: workspace:*
+        version: link:../../../../../astro
+
   packages/integrations/vercel/test/fixtures/serverless-prerender:
     dependencies:
       '@astrojs/vercel':