feat: lightweight worker for static exports (#566)

Strip the full worker from static export builds. When next.config sets
output: "export", vinext deploy now generates a wrangler config that
serves pre-rendered files directly via Cloudflare's built-in asset
serving — no worker entry, no ASSETS/IMAGES bindings, no KV namespace.

- Add `isStaticExport` to ProjectInfo with heuristic detection
  (reads next.config, strips single-line and block comments, matches
  output: "export" / 'export')
- generateWranglerConfig: static branch uses not_found_handling: "404-page"
- getFilesToGenerate: skip worker/index.ts for static exports
- Relax Cloudflare plugin guard: use already-loaded nextConfig.output
  instead of re-reading disk, so inline config overrides also work
- 24 new tests covering detection, config generation, and file generation

Closes #566

Author: raed04

packages/vinext/src/deploy.ts

@@ -119,6 +119,8 @@ type ProjectInfo = {
   projectName: string;
   /** Pages that use `revalidate` (ISR) */
   hasISR: boolean;
+  /** next.config.js sets output: 'export' (full static export) */
+  isStaticExport: boolean;
   /** package.json has "type": "module" */
   hasTypeModule: boolean;
   /** .mdx files detected in app/ or pages/ */
@@ -222,6 +224,9 @@ export function detectProject(root: string): ProjectInfo {
   // Detect ISR usage (rough heuristic: search for `revalidate` exports)
   const hasISR = detectISR(root, isAppRouter);
 
+  // Detect output: 'export' in next.config
+  const isStaticExport = detectStaticExport(root);
+
   // Detect "type": "module" in package.json
   const hasTypeModule = pkg?.type === "module";
 
@@ -250,13 +255,42 @@ export function detectProject(root: string): ProjectInfo {
     hasWrangler,
     projectName,
     hasISR,
+    isStaticExport,
     hasTypeModule,
     hasMDX,
     hasCodeHike,
     nativeModulesToStub,
   };
 }
 
+/**
+ * Heuristic: does the next.config file set `output: 'export'`?
+ *
+ * Limitations (consistent with detectISR): variable indirection like
+ * `const o = "export"; { output: o }` is not detected. Template-literal
+ * syntax (`output: \`export\``) is also not detected (uncommon in configs).
+ */
+export function detectStaticExport(root: string): boolean {
+  const configNames = ["next.config.ts", "next.config.mjs", "next.config.js", "next.config.cjs"];
+  for (const name of configNames) {
+    const configPath = path.join(root, name);
+    if (fs.existsSync(configPath)) {
+      try {
+        const content = fs.readFileSync(configPath, "utf-8");
+        // Strip comments to avoid matching commented-out config.
+        const stripped = content
+          .replace(/\/\/.*$/gm, "") // single-line comments
+          .replace(/\/\*[\s\S]*?\*\//g, ""); // block comments
+        // Match output: "export" or output: 'export' (enforcing matching quotes).
+        return /output\s*:\s*(?:"export"|'export')/.test(stripped);
+      } catch {
+        return false;
+      }
+    }
+  }
+  return false;
+}
+
 function detectISR(root: string, isAppRouter: boolean): boolean {
   // ISR detection is only implemented for App Router (scans for `export const revalidate`).
   // Pages Router ISR (getStaticProps + revalidate) is not detected here — wrangler.jsonc
@@ -396,31 +430,41 @@ export function generateWranglerConfig(info: ProjectInfo): string {
     name: info.projectName,
     compatibility_date: today,
     compatibility_flags: ["nodejs_compat"],
-    main: "./worker/index.ts",
-    assets: {
+  };
+
+  if (info.isStaticExport) {
+    // Static export: serve pre-rendered files directly — no worker needed.
+    // Cloudflare's built-in asset serving handles everything.
+    config.assets = {
+      directory: "dist/client",
+      not_found_handling: "404-page",
+    };
+  } else {
+    config.main = "./worker/index.ts";
+    config.assets = {
       // Wrangler 4.69+ requires `directory` when `assets` is an object.
       // The @cloudflare/vite-plugin always writes static assets to dist/client/.
       directory: "dist/client",
       not_found_handling: "none",
       // Expose static assets to the Worker via env.ASSETS so the image
       // optimization handler can fetch source images programmatically.
       binding: "ASSETS",
-    },
+    };
     // Cloudflare Images binding for next/image optimization.
     // Enables resize, format negotiation (AVIF/WebP), and quality transforms
     // at the edge. No user setup needed — wrangler creates the binding automatically.
-    images: {
+    config.images = {
       binding: "IMAGES",
-    },
-  };
+    };
 
-  if (info.hasISR) {
-    config.kv_namespaces = [
-      {
-        binding: "VINEXT_CACHE",
-        id: "<your-kv-namespace-id>",
-      },
-    ];
+    if (info.hasISR) {
+      config.kv_namespaces = [
+        {
+          binding: "VINEXT_CACHE",
+          id: "<your-kv-namespace-id>",
+        },
+      ];
+    }
   }
 
   return JSON.stringify(config, null, 2) + "\n";
@@ -1112,7 +1156,7 @@ export function getFilesToGenerate(info: ProjectInfo): GeneratedFile[] {
     });
   }
 
-  if (!info.hasWorkerEntry) {
+  if (!info.hasWorkerEntry && !info.isStaticExport) {
     const workerContent = info.isAppRouter
       ? generateAppRouterWorkerEntry(info.hasISR)
       : generatePagesRouterWorkerEntry();

packages/vinext/src/index.ts

@@ -1808,7 +1808,8 @@ export default function vinext(options: VinextOptions = {}): PluginOption[] {
           !hasCloudflarePlugin &&
           !hasNitroPlugin &&
           hasWranglerConfig(root) &&
-          !options.disableAppRouter
+          !options.disableAppRouter &&
+          nextConfig.output !== "export"
         ) {
           throw new Error(
             formatMissingCloudflarePluginError({

tests/deploy.test.ts

@@ -19,6 +19,7 @@ import {
   viteConfigHasCloudflarePlugin,
   hasWranglerConfig,
   formatMissingCloudflarePluginError,
+  detectStaticExport,
 } from "../packages/vinext/src/deploy.js";
 import {
   detectPackageManager,
@@ -288,6 +289,127 @@ describe("detectProject", () => {
     const info = detectProject(tmpDir);
     expect(info.hasISR).toBe(false);
   });
+
+  it("detects output: 'export' in next.config.mjs", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(true);
+  });
+
+  it('detects output:"export" without spaces', () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default {output:"export"};`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(true);
+  });
+
+  it("isStaticExport is false when no export config", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default {};`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("detects output: 'export' in next.config.ts", () => {
+    mkdir(tmpDir, "app");
+    writeFile(
+      tmpDir,
+      "next.config.ts",
+      `const config = { output: 'export' };\nexport default config;`,
+    );
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(true);
+  });
+
+  it("detects output: 'export' in next.config.cjs", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.cjs", `module.exports = { output: "export" };`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(true);
+  });
+
+  it("does not detect commented-out output: 'export'", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `// output: "export"\nexport default {};`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("does not detect output: 'standalone' as static export", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "standalone" };`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("isStaticExport is false when no next.config exists", () => {
+    mkdir(tmpDir, "app");
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("handles empty next.config.js gracefully", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.js", "");
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("prefers next.config.ts over next.config.mjs for static export detection", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.ts", `export default {};`);
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    // .ts is checked first and has no output: "export", so result is false
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("does not detect output: 'export' inside block comments", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `/* output: "export" */\nexport default {};`);
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+
+  it("does not detect output: 'export' inside multiline block comments", () => {
+    mkdir(tmpDir, "app");
+    writeFile(
+      tmpDir,
+      "next.config.mjs",
+      "/*\n * Previously: output: 'export'\n */\nexport default {};",
+    );
+    const info = detectProject(tmpDir);
+    expect(info.isStaticExport).toBe(false);
+  });
+});
+
+// ─── detectStaticExport (direct) ────────────────────────────────────────────
+
+describe("detectStaticExport", () => {
+  it('returns true for output: "export"', () => {
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    expect(detectStaticExport(tmpDir)).toBe(true);
+  });
+
+  it("returns false when no next.config exists", () => {
+    expect(detectStaticExport(tmpDir)).toBe(false);
+  });
+
+  it('returns false for output: "standalone"', () => {
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "standalone" };`);
+    expect(detectStaticExport(tmpDir)).toBe(false);
+  });
+
+  it("strips block comments before matching", () => {
+    writeFile(tmpDir, "next.config.mjs", `/* output: "export" */ export default {};`);
+    expect(detectStaticExport(tmpDir)).toBe(false);
+  });
+
+  it("strips single-line comments before matching", () => {
+    writeFile(tmpDir, "next.config.mjs", `// output: "export"\nexport default {};`);
+    expect(detectStaticExport(tmpDir)).toBe(false);
+  });
 });
 
 // ─── generateWranglerConfig ─────────────────────────────────────────────────
@@ -365,6 +487,67 @@ describe("generateWranglerConfig", () => {
     expect(parsed.images).toBeDefined();
     expect(parsed.images.binding).toBe("IMAGES");
   });
+
+  it("generates static-only config when isStaticExport is true", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    const config = generateWranglerConfig(info);
+    const parsed = JSON.parse(config);
+
+    // No worker entry — Cloudflare serves static files directly
+    expect(parsed.main).toBeUndefined();
+    // Uses 404-page handling instead of routing all requests to worker
+    expect(parsed.assets.not_found_handling).toBe("404-page");
+    // No ASSETS binding needed (no worker to bind to)
+    expect(parsed.assets.binding).toBeUndefined();
+    // Still has directory for asset serving
+    expect(parsed.assets.directory).toBe("dist/client");
+    // No image optimization binding
+    expect(parsed.images).toBeUndefined();
+  });
+
+  it("omits KV namespace for static exports even with ISR-like patterns", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    writeFile(
+      tmpDir,
+      "app/page.tsx",
+      "export const revalidate = 30;\nexport default function() { return <div/> }",
+    );
+    const info = detectProject(tmpDir);
+    const config = generateWranglerConfig(info);
+    const parsed = JSON.parse(config);
+
+    expect(parsed.kv_namespaces).toBeUndefined();
+  });
+
+  it("static export config still includes $schema, compatibility_date, and compatibility_flags", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    const config = generateWranglerConfig(info);
+    const parsed = JSON.parse(config);
+
+    expect(parsed.$schema).toBe("node_modules/wrangler/config-schema.json");
+    const today = new Date().toISOString().split("T")[0];
+    expect(parsed.compatibility_date).toBe(today);
+    expect(parsed.compatibility_flags).toContain("nodejs_compat");
+  });
+
+  it("non-static config has main, ASSETS binding, and images (regression guard)", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default {};`);
+    const info = detectProject(tmpDir);
+    const config = generateWranglerConfig(info);
+    const parsed = JSON.parse(config);
+
+    expect(parsed.main).toBe("./worker/index.ts");
+    expect(parsed.assets.binding).toBe("ASSETS");
+    expect(parsed.assets.not_found_handling).toBe("none");
+    expect(parsed.images).toBeDefined();
+    expect(parsed.images.binding).toBe("IMAGES");
+  });
 });
 
 // ─── Worker Entry Generation ─────────────────────────────────────────────────
@@ -1096,6 +1279,36 @@ describe("getFilesToGenerate", () => {
     expect(viteFile).toBeDefined();
     expect(viteFile!.content).not.toContain("plugin-rsc");
   });
+
+  it("skips worker/index.ts for static exports", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    const files = getFilesToGenerate(info);
+
+    const workerFile = files.find((f) => f.description === "worker/index.ts");
+    expect(workerFile).toBeUndefined();
+  });
+
+  it("still generates wrangler.jsonc for static exports", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    const files = getFilesToGenerate(info);
+
+    const wranglerFile = files.find((f) => f.description === "wrangler.jsonc");
+    expect(wranglerFile).toBeDefined();
+  });
+
+  it("still generates vite.config.ts for static exports", () => {
+    mkdir(tmpDir, "app");
+    writeFile(tmpDir, "next.config.mjs", `export default { output: "export" };`);
+    const info = detectProject(tmpDir);
+    const files = getFilesToGenerate(info);
+
+    const viteFile = files.find((f) => f.description === "vite.config.ts");
+    expect(viteFile).toBeDefined();
+  });
 });
 
 // ─── viteConfigHasCloudflarePlugin ───────────────────────────────────────────