fix(vite-8): remove deprecated Rollup config options for Vite 8/Rolldown

packages/vinext/src/cli.ts

@@ -13,7 +13,7 @@
  * needed for most Next.js apps.
  */
 
-import vinext, { clientOutputConfig, clientTreeshakeConfig } from "./index.js";
+import vinext, { getClientOutputConfig, getClientTreeshakeConfig } from "./index.js";
 import { printBuildReport } from "./build/report.js";
 import path from "node:path";
 import fs from "node:fs";
@@ -350,6 +350,7 @@ async function buildApp() {
   console.log(`\n  vinext build  (Vite ${getViteVersion()})\n`);
 
   const isApp = hasAppDir();
+  const viteMajorVersion = parseInt(getViteVersion().split(".")[0], 10);
   // In verbose mode, skip the custom logger so raw Vite/Rollup output is shown.
   const logger = parsed.verbose
     ? vite.createLogger("info", { allowClearScreen: false })
@@ -387,8 +388,8 @@ async function buildApp() {
             ssrManifest: true,
             rollupOptions: {
               input: "virtual:vinext-client-entry",
-              output: clientOutputConfig,
-              treeshake: clientTreeshakeConfig,
+              output: getClientOutputConfig(viteMajorVersion),
+              treeshake: getClientTreeshakeConfig(viteMajorVersion),
             },
           },
         },

packages/vinext/src/index.ts

@@ -525,6 +525,37 @@ const clientTreeshakeConfig = {
   moduleSideEffects: "no-external" as const,
 };
 
+/**
+ * Get Rollup-compatible output config for client builds.
+ * Returns config without Vite 8/Rolldown-incompatible options.
+ */
+function getClientOutputConfig(viteVersion: number) {
+  if (viteVersion >= 8) {
+    // Vite 8+ uses Rolldown which doesn't support experimentalMinChunkSize
+    return {
+      manualChunks: clientManualChunks,
+    };
+  }
+  // Vite 7 uses Rollup with experimentalMinChunkSize support
+  return clientOutputConfig;
+}
+
+/**
+ * Get Rollup-compatible treeshake config for client builds.
+ * Returns config without Vite 8/Rolldown-incompatible options.
+ */
+function getClientTreeshakeConfig(viteVersion: number) {
+  if (viteVersion >= 8) {
+    // Vite 8+ uses Rolldown which doesn't support `preset` option
+    // moduleSideEffects is still supported in Rolldown
+    return {
+      moduleSideEffects: "no-external" as const,
+    };
+  }
+  // Vite 7 uses Rollup with preset support
+  return clientTreeshakeConfig;
+}
+
 type BuildManifestChunk = {
   file: string;
   isEntry?: boolean;
@@ -1232,15 +1263,17 @@ export default function vinext(options: VinextOptions = {}): PluginOption[] {
               // avoid leaking into RSC/SSR environments where
               // moduleSideEffects: 'no-external' could drop server packages
               // that rely on module-level side effects.
-              ...(!isSSR && !isMultiEnv ? { treeshake: clientTreeshakeConfig } : {}),
+              ...(!isSSR && !isMultiEnv
+                ? { treeshake: getClientTreeshakeConfig(viteMajorVersion) }
+                : {}),
               // Code-split client bundles: separate framework (React/ReactDOM),
               // vinext runtime (shims), and vendor packages into their own
               // chunks so pages only load the JS they need.
               // Only apply globally for standalone client builds (CLI Pages
               // Router). For multi-environment builds (App Router, Cloudflare),
               // manualChunks is set per-environment on the client env below
               // to avoid leaking into RSC/SSR environments.
-              ...(!isSSR && !isMultiEnv ? { output: clientOutputConfig } : {}),
+              ...(!isSSR && !isMultiEnv ? { output: getClientOutputConfig(viteMajorVersion) } : {}),
             },
           },
           // Let OPTIONS requests pass through Vite's CORS middleware to our
@@ -1444,8 +1477,8 @@ export default function vinext(options: VinextOptions = {}): PluginOption[] {
                 ...(hasCloudflarePlugin ? { manifest: true } : {}),
                 rollupOptions: {
                   input: { index: VIRTUAL_APP_BROWSER_ENTRY },
-                  output: clientOutputConfig,
-                  treeshake: clientTreeshakeConfig,
+                  output: getClientOutputConfig(viteMajorVersion),
+                  treeshake: getClientTreeshakeConfig(viteMajorVersion),
                 },
               },
             },
@@ -1463,8 +1496,8 @@ export default function vinext(options: VinextOptions = {}): PluginOption[] {
                 ssrManifest: true,
                 rollupOptions: {
                   input: { index: VIRTUAL_CLIENT_ENTRY },
-                  output: clientOutputConfig,
-                  treeshake: clientTreeshakeConfig,
+                  output: getClientOutputConfig(viteMajorVersion),
+                  treeshake: getClientTreeshakeConfig(viteMajorVersion),
                 },
               },
             },
@@ -3752,7 +3785,14 @@ export type {
 export type { NextConfig } from "./config/next-config.js";
 
 // Exported for CLI and testing
-export { clientManualChunks, clientOutputConfig, clientTreeshakeConfig, computeLazyChunks };
+export {
+  clientManualChunks,
+  clientOutputConfig,
+  clientTreeshakeConfig,
+  computeLazyChunks,
+  getClientOutputConfig,
+  getClientTreeshakeConfig,
+};
 export { augmentSsrManifestFromBundle as _augmentSsrManifestFromBundle };
 export { resolvePostcssStringPlugins as _resolvePostcssStringPlugins };
 export { _postcssCache };