feat(vite-plugin-cloudflare): disable rsc server handler by default

Author: edmundhung

.changeset/disable-rsc-server-handler.md

@@ -0,0 +1,7 @@
+---
+"@cloudflare/vite-plugin": minor
+---
+
+Set `{ serverHandler: false }` automatically when using `@vitejs/plugin-rsc`
+
+By default, `@vitejs/plugin-rsc` adds dev and preview server middleware that imports the RSC entry in Node.js. This fails with `cloudflare:*` imports (`ERR_UNSUPPORTED_ESM_URL_SCHEME`) and is unnecessary since the Cloudflare plugin handles requests via workerd. Users no longer need to pass `rsc({ serverHandler: false })` manually.

packages/vite-plugin-cloudflare/src/plugins/config.ts

@@ -21,7 +21,10 @@ export const configPlugin = createPlugin("config", (ctx) => {
 	return {
 		config(userConfig, env) {
 			if (ctx.resolvedPluginConfig.type === "preview") {
-				return { appType: "custom" };
+				return {
+					appType: "custom",
+					rsc: { serverHandler: false },
+				};
 			}
 
 			if (!ctx.hasShownWorkerConfigWarnings) {
@@ -43,6 +46,7 @@ export const configPlugin = createPlugin("config", (ctx) => {
 
 			return {
 				appType: "custom",
+				rsc: { serverHandler: false },
 				server: {
 					fs: {
 						deny: [...defaultDeniedFiles, ".dev.vars", ".dev.vars.*"],