feat: support import.meta.hot.invalidate

docs/guide/api-hmr.md

@@ -125,7 +125,18 @@ Calling `import.meta.hot.decline()` indicates this module is not hot-updatable,
 
 ## `hot.invalidate()`
 
-For now, calling `import.meta.hot.invalidate()` simply reloads the page.
+A self-accepting module may realize during runtime that it can't handle a HMR update, and so the update needs to be forcefully propagated to importers. By calling `import.meta.hot.invalidate()`, the HMR server will invalidate the importers of the caller, as if the caller wasn't self-accepting.
+
+Note that you should always call `import.meta.hot.accept` even if you plan to call `invalidate` immediately afterwards, or else the HMR client won't listen for future changes to the self-accepting module. To communicate your intent clearly, we recommend calling `invalidate` within the `accept` callback like so:
+
+    ```ts
+    import.meta.hot.accept(module => {
+      // You may use the new module instance to decide whether to invalidate.
+      if (cannotHandleUpdate(module)) {
+        import.meta.hot.invalidate()
+      }
+    })
+    ```
 
 ## `hot.on(event, cb)`
 
@@ -136,6 +147,7 @@ The following HMR events are dispatched by Vite automatically:
 - `'vite:beforeUpdate'` when an update is about to be applied (e.g. a module will be replaced)
 - `'vite:beforeFullReload'` when a full reload is about to occur
 - `'vite:beforePrune'` when modules that are no longer needed are about to be pruned
+- `'vite:invalidate'` when a module is invalidated with `import.meta.hot.invalidate()`
 - `'vite:error'` when an error occurs (e.g. syntax error)
 
 Custom HMR events can also be sent from plugins. See [handleHotUpdate](./api-plugin#handlehotupdate) for more details.

packages/vite/src/client/client.ts

@@ -546,10 +546,10 @@ export function createHotContext(ownerPath: string): ViteHotContext {
     // eslint-disable-next-line @typescript-eslint/no-empty-function
     decline() {},
 
+    // tell the server to re-perform hmr propagation from this module as root
     invalidate() {
-      // TODO should tell the server to re-perform hmr propagation
-      // from this module as root
-      location.reload()
+      notifyListeners('vite:invalidate', ownerPath)
+      this.send('vite:invalidate', ownerPath)
     },
 
     // custom events

packages/vite/src/node/server/index.ts

@@ -67,7 +67,12 @@ import { timeMiddleware } from './middlewares/time'
 import { ModuleGraph } from './moduleGraph'
 import { errorMiddleware, prepareError } from './middlewares/error'
 import type { HmrOptions } from './hmr'
-import { handleFileAddUnlink, handleHMRUpdate } from './hmr'
+import {
+  getShortName,
+  handleFileAddUnlink,
+  handleHMRUpdate,
+  updateModules
+} from './hmr'
 import { openBrowser } from './openBrowser'
 import type { TransformOptions, TransformResult } from './transformRequest'
 import { transformRequest } from './transformRequest'
@@ -489,6 +494,14 @@ export async function createServer(
     handleFileAddUnlink(normalizePath(file), server)
   })
 
+  ws.on('vite:invalidate', async (url: string) => {
+    const mod = moduleGraph.urlToModuleMap.get(url)
+    if (mod && mod.isSelfAccepting && mod.lastHMRTimestamp > 0) {
+      const file = getShortName(mod.file!, config.root)
+      updateModules(file, [...mod.importers], mod.lastHMRTimestamp, server)
+    }
+  })
+
   if (!middlewareMode && httpServer) {
     httpServer.once('listening', () => {
       // update actual port since this may be different from initial value

playground/hmr/__tests__/hmr.spec.ts

@@ -18,14 +18,14 @@ test('should render', async () => {
 
 if (!isBuild) {
   test('should connect', async () => {
-    expect(browserLogs.length).toBe(2)
+    expect(browserLogs.length).toBe(3)
     expect(browserLogs.some((msg) => msg.match('connected'))).toBe(true)
     browserLogs.length = 0
   })
 
   test('self accept', async () => {
     const el = await page.$('.app')
-
+    browserLogs.length = 0
     editFile('hmr.ts', (code) => code.replace('const foo = 1', 'const foo = 2'))
     await untilUpdated(() => el.textContent(), '2')
 
@@ -91,6 +91,7 @@ if (!isBuild) {
 
   test('nested dep propagation', async () => {
     const el = await page.$('.nested')
+    browserLogs.length = 0
 
     editFile('hmrNestedDep.js', (code) =>
       code.replace('const foo = 1', 'const foo = 2')
@@ -127,6 +128,25 @@ if (!isBuild) {
     browserLogs.length = 0
   })
 
+  test('invalidate', async () => {
+    browserLogs.length = 0
+    const el = await page.$('.invalidation')
+
+    editFile('invalidation/child.js', (code) =>
+      code.replace('child', 'child updated')
+    )
+    await untilUpdated(() => el.textContent(), 'child updated')
+    expect(browserLogs).toMatchObject([
+      '>>> vite:beforeUpdate -- update',
+      '>>> vite:invalidate -- /invalidation/child.js',
+      '[vite] hot updated: /invalidation/child.js',
+      '>>> vite:beforeUpdate -- update',
+      '(invalidation) parent is executing',
+      '[vite] hot updated: /invalidation/parent.js'
+    ])
+    browserLogs.length = 0
+  })
+
   test('plugin hmr handler + custom event', async () => {
     const el = await page.$('.custom')
     editFile('customFile.js', (code) => code.replace('custom', 'edited'))

playground/hmr/hmr.ts

@@ -2,6 +2,7 @@
 import { virtual } from 'virtual:file'
 import { foo as depFoo, nestedFoo } from './hmrDep'
 import './importing-updated'
+import './invalidation/parent'
 
 export const foo = 1
 text('.app', foo)
@@ -88,6 +89,10 @@ if (import.meta.hot) {
     console.log(`>>> vite:error -- ${event.type}`)
   })
 
+  import.meta.hot.on('vite:invalidate', (event) => {
+    console.log(`>>> vite:invalidate -- ${event}`)
+  })
+
   import.meta.hot.on('custom:foo', ({ msg }) => {
     text('.custom', msg)
   })

playground/hmr/index.html

@@ -20,6 +20,7 @@
 <div class="nested"></div>
 <div class="custom"></div>
 <div class="virtual"></div>
+<div class="invalidation"></div>
 <div class="custom-communication"></div>
 <div class="css-prev"></div>
 <div class="css-post"></div>

playground/hmr/invalidation/child.js

@@ -0,0 +1,9 @@
+if (import.meta.hot) {
+  // Need to accept, to register a callback for HMR
+  import.meta.hot.accept(() => {
+    // Trigger HMR in importers
+    import.meta.hot.invalidate()
+  })
+}
+
+export const value = 'child'

playground/hmr/invalidation/parent.js

@@ -0,0 +1,9 @@
+import { value } from './child'
+
+if (import.meta.hot) {
+  import.meta.hot.accept()
+}
+
+console.log('(invalidation) parent is executing')
+
+document.querySelector('.invalidation').innerHTML = value