fix(nuxt): hint prerenderer to crawl routes at runtime (#26694)

packages/nuxt/src/core/nitro.ts

@@ -507,9 +507,12 @@ export async function initNitro (nuxt: Nuxt & { _nitro?: Nitro }) {
 
   if (nitro.options.static) {
     nitro.hooks.hook('prerender:routes', (routes) => {
-      for (const route of [nuxt.options.ssr ? '/' : '/index.html', '/200.html', '/404.html']) {
+      for (const route of ['/200.html', '/404.html']) {
         routes.add(route)
       }
+      if (!nuxt.options.ssr) {
+        routes.add('/index.html')
+      }
     })
   }
 

packages/nuxt/src/pages/module.ts

@@ -3,7 +3,6 @@ import { mkdir, readFile } from 'node:fs/promises'
 import { addBuildPlugin, addComponent, addPlugin, addTemplate, addTypeTemplate, addVitePlugin, addWebpackPlugin, defineNuxtModule, findPath, logger, updateTemplates, useNitro } from '@nuxt/kit'
 import { dirname, join, relative, resolve } from 'pathe'
 import { genImport, genObjectFromRawEntries, genString } from 'knitwork'
-import { joinURL } from 'ufo'
 import type { Nuxt, NuxtApp, NuxtPage } from 'nuxt/schema'
 import { createRoutesContext } from 'unplugin-vue-router'
 import { resolveOptions } from 'unplugin-vue-router/options'
@@ -18,8 +17,6 @@ import type { PageMetaPluginOptions } from './plugins/page-meta'
 import { PageMetaPlugin } from './plugins/page-meta'
 import { RouteInjectionPlugin } from './plugins/route-injection'
 
-const OPTIONAL_PARAM_RE = /^\/?:.*(\?|\(\.\*\)\*)$/
-
 export default defineNuxtModule({
   meta: {
     name: 'pages',
@@ -266,36 +263,14 @@ export default defineNuxtModule({
       })
     })
 
-    nuxt.hook('nitro:init', (nitro) => {
-      if (nuxt.options.dev || !nitro.options.static || nuxt.options.router.options.hashMode) { return }
-      // Prerender all non-dynamic page routes when generating app
-      const prerenderRoutes = new Set<string>()
-      nuxt.hook('pages:extend', (pages) => {
-        prerenderRoutes.clear()
-        const processPages = (pages: NuxtPage[], currentPath = '/') => {
-          for (const page of pages) {
-            // Add root of optional dynamic paths and catchalls
-            if (OPTIONAL_PARAM_RE.test(page.path) && !page.children?.length) { prerenderRoutes.add(currentPath) }
-            // Skip dynamic paths
-            if (page.path.includes(':')) { continue }
-            const route = joinURL(currentPath, page.path)
-            prerenderRoutes.add(route)
-            if (page.children) { processPages(page.children, route) }
-          }
-        }
-        processPages(pages)
-      })
-      nuxt.hook('nitro:build:before', (nitro) => {
-        if (nitro.options.prerender.routes.length) {
-          for (const route of nitro.options.prerender.routes) {
-            // Skip default route value as we only generate it if it is already
-            // in the detected routes from `~/pages`.
-            if (route === '/') { continue }
-            prerenderRoutes.add(route)
-          }
-        }
-        nitro.options.prerender.routes = Array.from(prerenderRoutes)
-      })
+    nuxt.hook('app:resolve', (app) => {
+      const nitro = useNitro()
+      if (nitro.options.prerender.crawlLinks) {
+        app.plugins.push({
+          src: resolve(runtimeDir, 'plugins/prerender.server'),
+          mode: 'server',
+        })
+      }
     })
 
     nuxt.hook('imports:extend', (imports) => {

packages/nuxt/src/pages/runtime/plugins/prerender.server.ts

@@ -0,0 +1,45 @@
+import type { RouteRecordRaw } from 'vue-router'
+import { joinURL } from 'ufo'
+
+import { defineNuxtPlugin } from '#app/nuxt'
+import { prerenderRoutes } from '#app/composables/ssr'
+// @ts-expect-error virtual file
+import _routes from '#build/routes'
+// @ts-expect-error virtual file
+import routerOptions from '#build/router.options'
+
+let routes: string[]
+
+export default defineNuxtPlugin(async () => {
+  if (!import.meta.server || !import.meta.prerender || routerOptions.hashMode) {
+    return
+  }
+  if (routes && !routes.length) { return }
+
+  routes ||= Array.from(processRoutes(await routerOptions.routes?.(_routes) ?? _routes))
+  const batch = routes.splice(0, 10)
+  prerenderRoutes(batch)
+})
+
+// Implementation
+
+const OPTIONAL_PARAM_RE = /^\/?:.*(\?|\(\.\*\)\*)$/
+
+function processRoutes (routes: RouteRecordRaw[], currentPath = '/', routesToPrerender = new Set<string>()) {
+  for (const route of routes) {
+    // Add root of optional dynamic paths and catchalls
+    if (OPTIONAL_PARAM_RE.test(route.path) && !route.children?.length) {
+      routesToPrerender.add(currentPath)
+    }
+    // Skip dynamic paths
+    if (route.path.includes(':')) {
+      continue
+    }
+    const fullPath = joinURL(currentPath, route.path)
+    routesToPrerender.add(fullPath)
+    if (route.children) {
+      processRoutes(route.children, fullPath, routesToPrerender)
+    }
+  }
+  return routesToPrerender
+}