feat(nuxt): add experimental.headNext unhead integration (#22620)

packages/nuxt/package.json

@@ -58,9 +58,9 @@
     "@nuxt/telemetry": "^2.4.1",
     "@nuxt/ui-templates": "^1.3.1",
     "@nuxt/vite-builder": "workspace:../vite",
-    "@unhead/ssr": "^1.2.2",
+    "@unhead/ssr": "^1.3.2",
-    "@unhead/vue": "^1.2.2",
+    "@unhead/vue": "^1.3.2",
-    "@unhead/dom": "^1.2.2",
+    "@unhead/dom": "^1.3.2",
     "@vue/shared": "^3.3.4",
     "acorn": "8.10.0",
     "c12": "^1.4.2",

packages/nuxt/src/core/runtime/nitro/renderer.ts

@@ -17,12 +17,15 @@ import { joinURL, withoutTrailingSlash } from 'ufo'
 import { renderToString as _renderToString } from 'vue/server-renderer'
 import { hash } from 'ohash'
 import { renderSSRHead } from '@unhead/ssr'
+import type { HeadEntryOptions } from '@unhead/schema'
 
 import { defineRenderHandler, getRouteRules, useRuntimeConfig, useStorage } from '#internal/nitro'
 import { useNitroApp } from '#internal/nitro/app'
 
 import type { Link, Script } from '@unhead/vue'
 import { createServerHead } from '@unhead/vue'
+// @ts-expect-error virtual file
+import unheadPlugins from '#internal/unhead-plugins.mjs'
 // eslint-disable-next-line import/no-restricted-paths
 import type { NuxtPayload, NuxtSSRContext } from '#app/nuxt'
 // @ts-expect-error virtual file
@@ -239,8 +242,12 @@ export default defineRenderHandler(async (event): Promise<Partial<RenderResponse
   // Get route options (currently to apply `ssr: false`)
   const routeOptions = getRouteRules(event)
 
-  const head = createServerHead()
+  const head = createServerHead({
-  head.push(appHead)
+    plugins: unheadPlugins
+  })
+  // needed for hash hydration plugin to work
+  const headEntryOptions: HeadEntryOptions = { mode: 'server' }
+  head.push(appHead, headEntryOptions)
 
   // Initialize ssr context
   const ssrContext: NuxtSSRContext = {
@@ -336,7 +343,7 @@ export default defineRenderHandler(async (event): Promise<Partial<RenderResponse
           ? { rel: 'preload', as: 'fetch', crossorigin: 'anonymous', href: payloadURL }
           : { rel: 'modulepreload', href: payloadURL }
       ]
-    })
+    }, headEntryOptions)
   }
 
   // 2. Styles
@@ -346,17 +353,17 @@ export default defineRenderHandler(async (event): Promise<Partial<RenderResponse
         ({ rel: 'stylesheet', href: renderer.rendererContext.buildAssetsURL(resource.file) })
       ),
     style: inlinedStyles
-  })
+  }, headEntryOptions)
 
   if (!NO_SCRIPTS) {
     // 3. Resource Hints
     // TODO: add priorities based on Capo
     head.push({
       link: getPreloadLinks(ssrContext, renderer.rendererContext) as Link[]
-    })
+    }, headEntryOptions)
     head.push({
       link: getPrefetchLinks(ssrContext, renderer.rendererContext) as Link[]
-    })
+    }, headEntryOptions)
     // 4. Payloads
     head.push({
       script: _PAYLOAD_EXTRACTION
@@ -367,6 +374,7 @@ export default defineRenderHandler(async (event): Promise<Partial<RenderResponse
           ? renderPayloadJsonScript({ id: '__NUXT_DATA__', ssrContext, data: ssrContext.payload })
           : renderPayloadScript({ ssrContext, data: ssrContext.payload })
     }, {
+      ...headEntryOptions,
       // this should come before another end of body scripts
       tagPosition: 'bodyClose',
       tagPriority: 'high'
@@ -382,7 +390,7 @@ export default defineRenderHandler(async (event): Promise<Partial<RenderResponse
         defer: resource.module ? null : true,
         crossorigin: ''
       }))
-    })
+    }, headEntryOptions)
   }
 
   // remove certain tags for nuxt islands

packages/nuxt/src/head/module.ts

@@ -1,5 +1,5 @@
 import { resolve } from 'pathe'
-import { addComponent, addImportsSources, addPlugin, defineNuxtModule, tryResolveModule } from '@nuxt/kit'
+import { addComponent, addImportsSources, addPlugin, addTemplate, defineNuxtModule, tryResolveModule } from '@nuxt/kit'
 import { distDir } from '../dirs'
 
 const components = ['NoScript', 'Link', 'Base', 'Title', 'Meta', 'Style', 'Head', 'Html', 'Body']
@@ -54,9 +54,26 @@ export default defineNuxtModule({
       addPlugin({ src: resolve(runtimeDir, 'plugins/vueuse-head-polyfill') })
     }
 
-    if (nuxt.options.experimental.headCapoPlugin) {
+    addTemplate({
-      addPlugin({ src: resolve(runtimeDir, 'plugins/capo') })
+      filename: 'unhead-plugins.mjs',
+      getContents () {
+        if (!nuxt.options.experimental.headNext) {
+          return 'export default []'
         }
+        // TODO don't use HashHydrationPlugin for SPA
+        return `import { CapoPlugin, HashHydrationPlugin } from '@unhead/vue'
+const plugins = [HashHydrationPlugin()];
+if (process.server) {
+  plugins.push(CapoPlugin({ track: true }));
+}
+export default plugins;`
+      }
+    })
+
+    // template is only exposed in nuxt context, expose in nitro context as well
+    nuxt.hooks.hook('nitro:config', (config) => {
+      config.virtual!['#internal/unhead-plugins.mjs'] = () => nuxt.vfs['#build/unhead-plugins']
+    })
 
     // Add library-specific plugin
     addPlugin({ src: resolve(runtimeDir, 'plugins/unhead') })

packages/nuxt/src/head/runtime/plugins/capo.ts

@@ -1,9 +0,0 @@
-import { CapoPlugin } from '@unhead/vue'
-import { defineNuxtPlugin } from '#app/nuxt'
-
-export default defineNuxtPlugin({
-  name: 'nuxt:head:capo',
-  setup (nuxtApp) {
-    nuxtApp.vueApp._context.provides.usehead.use(CapoPlugin({ track: true }))
-  }
-})

packages/nuxt/src/head/runtime/plugins/unhead.ts

@@ -2,10 +2,17 @@ import { createHead as createClientHead } from '@unhead/vue'
 import { renderDOMHead } from '@unhead/dom'
 import { defineNuxtPlugin } from '#app/nuxt'
 
+// @ts-expect-error virtual file
+import unheadPlugins from '#build/unhead-plugins.mjs'
+
 export default defineNuxtPlugin({
   name: 'nuxt:head',
   setup (nuxtApp) {
-    const head = import.meta.server ? nuxtApp.ssrContext!.head : createClientHead()
+    const head = import.meta.server
+      ? nuxtApp.ssrContext!.head
+      : createClientHead({
+        plugins: unheadPlugins
+      })
     // nuxt.config appHead is set server-side within the renderer
     nuxtApp.vueApp.use(head)
 

packages/schema/package.json

@@ -30,7 +30,7 @@
     "@types/file-loader": "5.0.1",
     "@types/pug": "2.0.6",
     "@types/sass-loader": "8.0.5",
-    "@unhead/schema": "1.2.2",
+    "@unhead/schema": "1.3.2",
     "@vitejs/plugin-vue": "4.2.3",
     "@vitejs/plugin-vue-jsx": "3.0.1",
     "@vue/compiler-core": "3.3.4",

packages/schema/src/config/experimental.ts

@@ -232,10 +232,12 @@ export default defineUntypedSchema({
     asyncContext: false,
 
     /**
-     * Add the capo.js head plugin in order to render tags in of the head in a more performant way.
+     * Use new experimental head optimisations:
+     * - Add the capo.js head plugin in order to render tags in of the head in a more performant way.
+     * - Uses the hash hydration plugin to reduce initial hydration
      *
-     * @see https://rviscomi.github.io/capo.js/user/rules/
+     * @see https://github.com/nuxt/nuxt/discussions/22632
      */
-    headCapoPlugin: false
+    headNext: false
   }
 })

pnpm-lock.yaml

@@ -365,14 +365,14 @@ importers:
         specifier: ^14.18.0 || >=16.10.0
         version: 18.17.5
       '@unhead/dom':
-        specifier: ^1.2.2
+        specifier: ^1.3.2
-        version: 1.2.2
+        version: 1.3.2
       '@unhead/ssr':
-        specifier: ^1.2.2
+        specifier: ^1.3.2
-        version: 1.2.2
+        version: 1.3.2
       '@unhead/vue':
-        specifier: ^1.2.2
+        specifier: ^1.3.2
-        version: 1.2.2(vue@3.3.4)
+        version: 1.3.2(vue@3.3.4)
       '@vue/shared':
         specifier: ^3.3.4
         version: 3.3.4
@@ -577,8 +577,8 @@ importers:
         specifier: 8.0.5
         version: 8.0.5
       '@unhead/schema':
-        specifier: 1.2.2
+        specifier: 1.3.2
-        version: 1.2.2
+        version: 1.3.2
       '@vitejs/plugin-vue':
         specifier: 4.2.3
         version: 4.2.3(vite@4.4.9)(vue@3.3.4)
@@ -3239,41 +3239,41 @@ packages:
       eslint-visitor-keys: 3.4.3
     dev: true
 
-  /@unhead/dom@1.2.2:
+  /@unhead/dom@1.3.2:
-    resolution: {integrity: sha512-ohganmg4i1Dd4wwQ2A9oLWEkJNpJRoERJNmFgzmScw9Vi3zMqoS4gPIofT20zUR5rhyyAsFojuDPojJ5vKcmqw==}
+    resolution: {integrity: sha512-iShW0eKzS4TvL0ATtmFNyRdx4JxFKiksoUSDAgkPrMaI8EhYtryU5IL0i5TVySSk4kIjMfLgd8uElOAfUHpTsQ==}
     dependencies:
-      '@unhead/schema': 1.2.2
+      '@unhead/schema': 1.3.2
-      '@unhead/shared': 1.2.2
+      '@unhead/shared': 1.3.2
     dev: false
 
-  /@unhead/schema@1.2.2:
+  /@unhead/schema@1.3.2:
-    resolution: {integrity: sha512-cGtNvadL76eGl7QxGjWHZxFqLv9a2VrmRpeEb1d7sm0cvnN0bWngdXDTdUyXzn7RVv/Um+/yae6eiT6A+pyQOw==}
+    resolution: {integrity: sha512-RiJUPipN6wntwpJvHBS8+84/eQyQdnznWTY+AC3woWTUfPHz7M4Hzu6jEkdnzpTX77HQMIIuu734vohmo+L91A==}
     dependencies:
       hookable: 5.5.3
       zhead: 2.0.10
 
-  /@unhead/shared@1.2.2:
+  /@unhead/shared@1.3.2:
-    resolution: {integrity: sha512-bWRjRyVzFsunih9GbHctvS8Aenj6KBe5ycql1JE4LawBL/NRYvCYUCPpdK5poVOqjYr0yDAf9m4JGaM2HwpVLw==}
+    resolution: {integrity: sha512-omOLfVnSkCpiIgikGKkgW6dzs+2jncAXtmPb+/IkFSkevbEfzyQlciDL12h9ChetRXjcWBZhu+OCCw0oY8W/Nw==}
     dependencies:
-      '@unhead/schema': 1.2.2
+      '@unhead/schema': 1.3.2
     dev: false
 
-  /@unhead/ssr@1.2.2:
+  /@unhead/ssr@1.3.2:
-    resolution: {integrity: sha512-mpWSNNbrQFJZolAfdVInPPiSGUva08bK9UbNV1zgDScUz+p+FnRg4cj77X+PpVeJ0+KPgjXfOsI8VQKYt+buYA==}
+    resolution: {integrity: sha512-ygbvJcJoN6wzGZnRfc3QmBtHp1awxEy2IIPbLyqgNWmkDElUfC14xM2BvNAEybSTR/EeX8Sf492CGw+5I0RqPw==}
     dependencies:
-      '@unhead/schema': 1.2.2
+      '@unhead/schema': 1.3.2
-      '@unhead/shared': 1.2.2
+      '@unhead/shared': 1.3.2
     dev: false
 
-  /@unhead/vue@1.2.2(vue@3.3.4):
+  /@unhead/vue@1.3.2(vue@3.3.4):
-    resolution: {integrity: sha512-AxOmY5JPn4fS34ovaivPnqg2my+InIkZDNSxCKfRkmbBtstFre/Fyf0d92Qfx0u8PJiSRPOjthEHx5vKDgTEJQ==}
+    resolution: {integrity: sha512-pM5SbKTTTzLroVHGfqBkDA8WCVk1qVWBe8sia5Rw1pSntp99VgDawJkiCdJJbyh/bOUOvCuAgUVHH1IRpB8QmQ==}
     peerDependencies:
       vue: '>=2.7 || >=3'
     dependencies:
-      '@unhead/schema': 1.2.2
+      '@unhead/schema': 1.3.2
-      '@unhead/shared': 1.2.2
+      '@unhead/shared': 1.3.2
       hookable: 5.5.3
-      unhead: 1.2.2
+      unhead: 1.3.2
       vue: 3.3.4
     dev: false
 
@@ -7183,7 +7183,7 @@ packages:
       graceful-fs: 4.2.11
 
   /jstransformer@1.0.0:
-    resolution: {integrity: sha512-C9YK3Rf8q6VAPDCCU9fnqo3mAfOH6vUGnMcP4AQAYIEpWtfGLpwOTmZ+igtdK5y+VvI2n3CyYSzy4Qh34eq24A==}
+    resolution: {integrity: sha1-7Yvwkh4vPx7U1cGkT2hwntJHIsM=}
     dependencies:
       is-promise: 2.2.2
       promise: 7.3.1
@@ -10316,7 +10316,7 @@ packages:
     engines: {node: '>=0.6'}
 
   /token-stream@1.0.0:
-    resolution: {integrity: sha512-VSsyNPPW74RpHwR8Fc21uubwHY7wMDeJLys2IX5zJNih+OnAnaifKHo+1LHT7DAdloQ7apeaaWg8l7qnf/TnEg==}
+    resolution: {integrity: sha1-zCAOqyYT9BZtJ/+a/HylbUnfbrQ=}
     dev: false
 
   /totalist@1.1.0:
@@ -10532,12 +10532,12 @@ packages:
       node-fetch-native: 1.2.0
       pathe: 1.1.1
 
-  /unhead@1.2.2:
+  /unhead@1.3.2:
-    resolution: {integrity: sha512-9wDuiso7YWNe0BTA5NGsHR0dtqn0YrL/5+NumfuXDxxYykavc6N27pzZxTXiuvVHbod8tFicsxA6pC9WhQvzqg==}
+    resolution: {integrity: sha512-s4qW/Rcp6OD4GRBreAQYRD4B1ch7zhVt57IGUIGdn6xwT0tHJucHBv2GbqdpaTLmZcUOdblBIt2HXdOlbW2YHg==}
     dependencies:
-      '@unhead/dom': 1.2.2
+      '@unhead/dom': 1.3.2
-      '@unhead/schema': 1.2.2
+      '@unhead/schema': 1.3.2
-      '@unhead/shared': 1.2.2
+      '@unhead/shared': 1.3.2
       hookable: 5.5.3
     dev: false
 

test/bundle.test.ts

@@ -19,7 +19,7 @@ describe.skipIf(process.env.SKIP_BUNDLE_SIZE === 'true' || process.env.ECOSYSTEM
   for (const outputDir of ['.output', '.output-inline']) {
     it('default client bundle size', async () => {
       const clientStats = await analyzeSizes('**/*.js', join(rootDir, outputDir, 'public'))
-      expect.soft(roundToKilobytes(clientStats.totalBytes)).toMatchInlineSnapshot('"97.4k"')
+      expect.soft(roundToKilobytes(clientStats.totalBytes)).toMatchInlineSnapshot('"95.0k"')
       expect(clientStats.files.map(f => f.replace(/\..*\.js/, '.js'))).toMatchInlineSnapshot(`
         [
           "_nuxt/entry.js",
@@ -32,10 +32,10 @@ describe.skipIf(process.env.SKIP_BUNDLE_SIZE === 'true' || process.env.ECOSYSTEM
     const serverDir = join(rootDir, '.output/server')
 
     const serverStats = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
-    expect.soft(roundToKilobytes(serverStats.totalBytes)).toMatchInlineSnapshot('"64.5k"')
+    expect.soft(roundToKilobytes(serverStats.totalBytes)).toMatchInlineSnapshot('"64.6k"')
 
     const modules = await analyzeSizes('node_modules/**/*', serverDir)
-    expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2342k"')
+    expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2335k"')
 
     const packages = modules.files
       .filter(m => m.endsWith('package.json'))
@@ -95,7 +95,7 @@ describe.skipIf(process.env.SKIP_BUNDLE_SIZE === 'true' || process.env.ECOSYSTEM
     expect.soft(roundToKilobytes(serverStats.totalBytes)).toMatchInlineSnapshot('"370k"')
 
     const modules = await analyzeSizes('node_modules/**/*', serverDir)
-    expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"604k"')
+    expect.soft(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"597k"')
 
     const packages = modules.files
       .filter(m => m.endsWith('package.json'))

test/fixtures/basic/nuxt.config.ts

@@ -195,7 +195,7 @@ export default defineNuxtConfig({
     treeshakeClientOnly: true,
     payloadExtraction: true,
     asyncContext: process.env.TEST_CONTEXT === 'async',
-    headCapoPlugin: true
+    headNext: true
   },
   appConfig: {
     fromNuxtConfig: true,