feat: support rolldown hmr

packages/plugin-vue/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@vitejs/plugin-vue",
+  "name": "plugin-vue-rolldown-hmr-demo",
   "version": "5.0.5",
   "license": "MIT",
   "author": "Evan You",

packages/plugin-vue/src/handleHotUpdate.ts

@@ -8,6 +8,7 @@ import type * as t from '@babel/types'
 
 import {
   cache,
+  clearPrevDescriptor,
   createDescriptor,
   getDescriptor,
   invalidateDescriptor,
@@ -341,6 +342,7 @@ export function handleTypeDepChange(
 ): ModuleNode[] {
   const affected = new Set<ModuleNode>()
   for (const file of affectedComponents) {
+    clearPrevDescriptor(file)
     invalidateScript(file)
     const mods = moduleGraph.getModulesByFile(file)
     if (mods) {

packages/plugin-vue/src/main.ts

@@ -12,6 +12,7 @@ import {
   createDescriptor,
   getDescriptor,
   getPrevDescriptor,
+  setPrevDescriptor,
   setSrcDescriptor,
 } from './utils/descriptorCache'
 import {
@@ -152,6 +153,7 @@ export async function transformMain(
     if (prevDescriptor && isOnlyTemplateChanged(prevDescriptor, descriptor)) {
       output.push(`export const _rerender_only = true`)
     }
+    setPrevDescriptor(filename, descriptor)
     output.push(
       `import.meta.hot.accept(mod => {`,
       `  if (!mod) return`,

packages/plugin-vue/src/utils/descriptorCache.ts

@@ -52,6 +52,14 @@ export function invalidateDescriptor(filename: string, hmr = false): void {
   }
 }
 
+export function setPrevDescriptor(filename: string, descriptor: SFCDescriptor): void {
+  prevCache.set(filename, descriptor)
+}
+
+export function clearPrevDescriptor(filename: string): void {
+  prevCache.delete(filename)
+}
+
 export function getDescriptor(
   filename: string,
   options: ResolvedOptions,