fix(plugin-rsc): skip build-only generateBundle in bundledDev

packages/plugin-rsc/e2e/bundled-dev.test.ts

@@ -0,0 +1,14 @@
+import { test } from '@playwright/test'
+import { useFixture } from './fixture'
+import { defineStarterTest } from './starter'
+
+// `experimental.bundledDev` runs a client Rollup build in dev, which used to
+// crash the assets-manifest `generateBundle` hook (no RSC bundle in dev).
+test.describe('bundled-dev', () => {
+  const f = useFixture({
+    root: 'examples/starter',
+    mode: 'dev',
+    command: 'pnpm dev --experimental-bundle',
+  })
+  defineStarterTest(f)
+})

packages/plugin-rsc/src/plugin.ts

@@ -1121,6 +1121,14 @@ export function createRpcClient(params) {
       },
       // client build
       generateBundle(_options, bundle) {
+        // In bundledDev the client environment runs a Rollup build while
+        // `mode === 'dev'`, so this hook fires even though there is no RSC
+        // build output. The build-only asset copying and `buildAssetsManifest`
+        // construction below assume a production build (`manager.bundles['rsc']`
+        // is populated); in dev the manifest is served by the `load` hook above
+        // instead. Skip the build-only work in dev to avoid crashing on the
+        // absent RSC bundle.
+        if (this.environment.mode === 'dev') return
         // copy assets from rsc build to client build
         if (this.environment.name === 'client') {
           const rscBundle = manager.bundles['rsc']!