fix(plugin-vue): distinguish HMR and transform descriptor (#227)

Author: sxzz

packages/plugin-vue/src/handleHotUpdate.ts

@@ -6,7 +6,7 @@ import { isCSSRequest } from 'vite'
 import {
   createDescriptor,
   getDescriptor,
-  setPrevDescriptor,
+  invalidateDescriptor,
 } from './utils/descriptorCache'
 import {
   getResolvedScript,
@@ -26,16 +26,14 @@ export async function handleHotUpdate(
   { file, modules, read }: HmrContext,
   options: ResolvedOptions,
 ): Promise<ModuleNode[] | void> {
-  const prevDescriptor = getDescriptor(file, options, false)
+  const prevDescriptor = getDescriptor(file, options, false, true)
   if (!prevDescriptor) {
     // file hasn't been requested yet (e.g. async component)
     return
   }
 
-  setPrevDescriptor(file, prevDescriptor)
-
   const content = await read()
-  const { descriptor } = createDescriptor(file, content, options)
+  const { descriptor } = createDescriptor(file, content, options, true)
 
   let needRerender = false
   const affectedModules = new Set<ModuleNode | undefined>()
@@ -150,6 +148,9 @@ export async function handleHotUpdate(
     updateType.push(`style`)
   }
   if (updateType.length) {
+    // invalidate the descriptor cache so that the next transform will
+    // re-analyze the file and pick up the changes.
+    invalidateDescriptor(file)
     debug(`[vue:update(${updateType.join('&')})] ${file}`)
   }
   return [...affectedModules].filter(Boolean) as ModuleNode[]

packages/plugin-vue/src/main.ts

@@ -9,6 +9,7 @@ import { addMapping, fromMap, toEncodedMap } from '@jridgewell/gen-mapping'
 import { normalizePath, transformWithEsbuild } from 'vite'
 import {
   createDescriptor,
+  getDescriptor,
   getPrevDescriptor,
   setSrcDescriptor,
 } from './utils/descriptorCache'
@@ -35,10 +36,12 @@ export async function transformMain(
 ) {
   const { devServer, isProduction, devToolsEnabled } = options
 
-  // prev descriptor is only set and used for hmr
   const prevDescriptor = getPrevDescriptor(filename)
   const { descriptor, errors } = createDescriptor(filename, code, options)
 
+  // set descriptor for HMR if it's not set yet
+  getDescriptor(filename, options, true, true)
+
   if (errors.length) {
     errors.forEach((error) =>
       pluginContext.error(createRollupError(filename, error)),

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

@@ -12,12 +12,14 @@ export interface SFCParseResult {
 }
 
 export const cache = new Map<string, SFCDescriptor>()
+export const hmrCache = new Map<string, SFCDescriptor>()
 const prevCache = new Map<string, SFCDescriptor | undefined>()
 
 export function createDescriptor(
   filename: string,
   source: string,
   { root, isProduction, sourceMap, compiler }: ResolvedOptions,
+  hmr = false,
 ): SFCParseResult {
   const { descriptor, errors } = compiler.parse(source, {
     filename,
@@ -28,35 +30,39 @@ export function createDescriptor(
   // project (relative to root) and on different systems.
   const normalizedPath = slash(path.normalize(path.relative(root, filename)))
   descriptor.id = getHash(normalizedPath + (isProduction ? source : ''))
-
-  cache.set(filename, descriptor)
+  ;(hmr ? hmrCache : cache).set(filename, descriptor)
   return { descriptor, errors }
 }
 
 export function getPrevDescriptor(filename: string): SFCDescriptor | undefined {
   return prevCache.get(filename)
 }
 
-export function setPrevDescriptor(
-  filename: string,
-  entry: SFCDescriptor,
-): void {
-  prevCache.set(filename, entry)
+export function invalidateDescriptor(filename: string, hmr = false): void {
+  const _cache = hmr ? hmrCache : cache
+  const prev = _cache.get(filename)
+  _cache.delete(filename)
+  if (prev) {
+    prevCache.set(filename, prev)
+  }
 }
 
 export function getDescriptor(
   filename: string,
   options: ResolvedOptions,
   createIfNotFound = true,
+  hmr = false,
 ): SFCDescriptor | undefined {
-  if (cache.has(filename)) {
-    return cache.get(filename)!
+  const _cache = hmr ? hmrCache : cache
+  if (_cache.has(filename)) {
+    return _cache.get(filename)!
   }
   if (createIfNotFound) {
     const { descriptor, errors } = createDescriptor(
       filename,
       fs.readFileSync(filename, 'utf-8'),
       options,
+      hmr,
     )
     if (errors.length) {
       throw errors[0]