feat(nuxt): allow chunk error or manifest update -> reload (#28160)

docs/2.guide/3.going-further/1.experimental-features.md

@@ -59,14 +59,16 @@ This feature will likely be removed in a near future.
 
 ## emitRouteChunkError
 
-Emits `app:chunkError` hook when there is an error loading vite/webpack chunks. Default behavior is to perform a hard reload of the new route when a chunk fails to load.
+Emits `app:chunkError` hook when there is an error loading vite/webpack chunks. Default behavior is to perform a reload of the new route on navigation to a new route when a chunk fails to load.
+
+If you set this to `'automatic-immediate'` Nuxt will reload the current route immediatly, instead of waiting for a navigation. This is useful for chunk errors that are not triggered by navigation, e.g., when your Nuxt app fails to load a [lazy component](/docs/guide/directory-structure/components#dynamic-imports). A potential downside of this behavior is undesired reloads, e.g., when your app does not need the chunk that caused the error.
 
 You can disable automatic handling by setting this to `false`, or handle chunk errors manually by setting it to `manual`.
 
 ```ts twoslash [nuxt.config.ts]
 export default defineNuxtConfig({
   experimental: {
-    emitRouteChunkError: 'automatic' // or 'manual' or false
+    emitRouteChunkError: 'automatic' // or 'automatic-immediate', 'manual' or false
   }
 })
 ```

packages/nuxt/src/app/plugins/chunk-reload-immediate.client.ts

@@ -0,0 +1,23 @@
+import { defineNuxtPlugin } from '../nuxt'
+import { reloadNuxtApp } from '../composables/chunk'
+import { addRouteMiddleware } from '../composables/router'
+
+const reloadNuxtApp_ = (path: string) => { reloadNuxtApp({ persistState: true, path }) }
+
+// See https://github.com/nuxt/nuxt/issues/23612 for more context
+export default defineNuxtPlugin({
+  name: 'nuxt:chunk-reload-immediate',
+  setup (nuxtApp) {
+    // Remember `to.path` when navigating to a new path: A `chunkError` may occur during navigation, we then want to then reload at `to.path`
+    let currentlyNavigationTo: null | string = null
+    addRouteMiddleware((to) => {
+      currentlyNavigationTo = to.path
+    })
+
+    // Reload when a `chunkError` is thrown
+    nuxtApp.hook('app:chunkError', () => reloadNuxtApp_(currentlyNavigationTo ?? nuxtApp._route.path))
+
+    // Reload when the app manifest updates
+    nuxtApp.hook('app:manifest:update', () => reloadNuxtApp_(nuxtApp._route.path))
+  },
+})

packages/nuxt/src/core/nuxt.ts

@@ -576,6 +576,11 @@ async function initNuxt (nuxt: Nuxt) {
   if (nuxt.options.experimental.emitRouteChunkError === 'automatic') {
     addPlugin(resolve(nuxt.options.appDir, 'plugins/chunk-reload.client'))
   }
+  // Add experimental immediate page reload support
+  if (nuxt.options.experimental.emitRouteChunkError === 'automatic-immediate') {
+    addPlugin(resolve(nuxt.options.appDir, 'plugins/chunk-reload-immediate.client'))
+  }
+
   // Add experimental session restoration support
   if (nuxt.options.experimental.restoreState) {
     addPlugin(resolve(nuxt.options.appDir, 'plugins/restore-state.client'))

packages/schema/src/config/experimental.ts

@@ -116,13 +116,16 @@ export default defineUntypedSchema({
      * Emit `app:chunkError` hook when there is an error loading vite/webpack
      * chunks.
      *
-     * By default, Nuxt will also perform a hard reload of the new route
-     * when a chunk fails to load when navigating to a new route.
+     * By default, Nuxt will also perform a reload of the new route
+     * when a chunk fails to load when navigating to a new route (`automatic`).
+     *
+     * Setting `automatic-immediate` will lead Nuxt to perform a reload of the current route
+     * right when a chunk fails to load (instead of waiting for navigation).
      *
      * You can disable automatic handling by setting this to `false`, or handle
      * chunk errors manually by setting it to `manual`.
      * @see [Nuxt PR #19038](https://github.com/nuxt/nuxt/pull/19038)
-     * @type {false | 'manual' | 'automatic'}
+     * @type {false | 'manual' | 'automatic' | 'automatic-immediate'}
      */
     emitRouteChunkError: {
       $resolve: (val) => {