fix: Respect trailing slash config for _next/image route in worker

.changeset/evil-rabbits-relax.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+fix: Respect trailing slash config for \_next/image route in worker

examples/playground15/app/api/signal/revalidate/route.ts

@@ -3,7 +3,7 @@ import { revalidatePath } from "next/cache";
 export const dynamic = "force-dynamic";
 
 export async function GET() {
-	revalidatePath("/signal");
+	revalidatePath("/signal/");
 
 	return new Response("ok");
 }

examples/playground15/app/image/page.tsx

@@ -0,0 +1,11 @@
+import Image from "next/image";
+
+import tomineImg from "../../public/tomine.webp";
+
+export default function Page() {
+	return (
+		<div>
+			<Image src={tomineImg} alt="Picture of Tomine" />
+		</div>
+	);
+}

examples/playground15/e2e/base.spec.ts

@@ -46,9 +46,9 @@ test.describe("playground/base", () => {
 	});
 
 	test("returns correct information about the request from a route handler", async ({ page, baseURL }) => {
-		const res = await page.request.get("/api/request");
+		const res = await page.request.get("/api/request/");
 		// Next.js can fall back to `localhost:3000` or `n` if it doesn't get the host - neither of these are expected.
-		const expectedURL = `${baseURL}/api/request`;
+		const expectedURL = `${baseURL}/api/request/`;
 		await expect(res.json()).resolves.toEqual({ nextUrl: expectedURL, url: expectedURL });
 	});
 

examples/playground15/e2e/image.test.ts

@@ -0,0 +1,10 @@
+import { test, expect } from "@playwright/test";
+
+test.describe("next/image with trailing slash", () => {
+	test("next/image with trailing slash", async ({ page }) => {
+		await page.goto("/image");
+		await expect(page.getByAltText("Picture of Tomine")).toBeVisible();
+		// The trailing slash should only be there if trailingSlash is enabled in next.config.ts
+		expect(await page.getAttribute("img", "src")).toMatch(/^\/_next\/image\//);
+	});
+});

examples/playground15/next.config.mjs → examples/playground15/next.config.ts

@@ -1,16 +1,17 @@
 import { initOpenNextCloudflareForDev, getDeploymentId } from "@opennextjs/cloudflare";
+import { NextConfig } from "next";
 
 initOpenNextCloudflareForDev();
 
-/** @type {import('next').NextConfig} */
-const nextConfig = {
+const nextConfig: NextConfig = {
 	typescript: { ignoreBuildErrors: true },
 	eslint: { ignoreDuringBuilds: true },
 	experimental: {
 		// Generate source map to validate the fix for opennextjs/opennextjs-cloudflare#341
 		serverSourceMaps: true,
 	},
 	deploymentId: getDeploymentId(),
+	trailingSlash: true,
 };
 
 export default nextConfig;

packages/cloudflare/src/cli/build/open-next/compile-init.ts

@@ -17,6 +17,7 @@ export async function compileInit(options: BuildOptions, wranglerConfig: Unstabl
 	const nextConfig = loadConfig(path.join(options.appBuildOutputPath, ".next"));
 	const basePath = nextConfig.basePath ?? "";
 	const deploymentId = nextConfig.deploymentId ?? "";
+	const trailingSlash = nextConfig.trailingSlash ?? false;
 
 	await build({
 		entryPoints: [initPath],
@@ -31,6 +32,7 @@ export async function compileInit(options: BuildOptions, wranglerConfig: Unstabl
 			__NEXT_BASE_PATH__: JSON.stringify(basePath),
 			__ASSETS_RUN_WORKER_FIRST__: JSON.stringify(wranglerConfig.assets?.run_worker_first ?? false),
 			__DEPLOYMENT_ID__: JSON.stringify(deploymentId),
+			__TRAILING_SLASH__: JSON.stringify(trailingSlash),
 		},
 	});
 }

packages/cloudflare/src/cli/templates/init.ts

@@ -97,6 +97,7 @@ function initRuntime() {
 		__BUILD_TIMESTAMP_MS__,
 		__NEXT_BASE_PATH__,
 		__ASSETS_RUN_WORKER_FIRST__,
+		__TRAILING_SLASH__,
 		// The external middleware will use the convertTo function of the `edge` converter
 		// by default it will try to fetch the request, but since we are running everything in the same worker
 		// we need to use the request as is.
@@ -155,4 +156,6 @@ declare global {
 	var __ASSETS_RUN_WORKER_FIRST__: boolean | string[] | undefined;
 	// Deployment ID
 	var __DEPLOYMENT_ID__: string;
+	// Next trailingSlash config
+	var __TRAILING_SLASH__: boolean;
 }

packages/cloudflare/src/cli/templates/worker.ts

@@ -39,7 +39,10 @@ export default {
 			}
 
 			// Fallback for the Next default image loader.
-			if (url.pathname === `${globalThis.__NEXT_BASE_PATH__}/_next/image`) {
+			if (
+				url.pathname ===
+				`${globalThis.__NEXT_BASE_PATH__}/_next/image${globalThis.__TRAILING_SLASH__ ? "/" : ""}`
+			) {
 				const imageUrl = url.searchParams.get("url") ?? "";
 				return await fetchImage(env.ASSETS, imageUrl, ctx);
 			}