feat(nuxt): allow using nuxt-client in all components (#25479)

docs/2.guide/2.directory-structure/1.components.md

@@ -318,7 +318,7 @@ You can partially hydrate a component by setting a `nuxt-client` attribute on th
 ```
 
 ::alert{type=info}
-This only works within a server component. Slots for client components are not available yet.
+This only works within a server component. Slots for client components are working only with `experimental.componentIsland.selectiveClient` set to `'deep'` and since they are rendered server-side, they are not interactive once client-side.
 ::
 
 #### Server Component Context

packages/nuxt/src/app/components/nuxt-island.ts

@@ -260,20 +260,24 @@ export default defineComponent({
             }
             if (import.meta.server) {
               for (const [id, info] of Object.entries(payloads.components ?? {})) {
-                const { html } = info
+                const { html, slots } = info
+                let replaced = html.replaceAll('data-island-uid', `data-island-uid="${uid.value}"`)
+                for (const slot in slots) {
+                  replaced = replaced.replaceAll(`data-island-slot="${slot}">`, (full) => full + slots[slot])
+                }
                 teleports.push(createVNode(Teleport, { to: `uid=${uid.value};client=${id}` }, {
-                  default: () => [createStaticVNode(html, 1)]
+                  default: () => [createStaticVNode(replaced, 1)]
                 }))
               }
-            }
-            if (selectiveClient && import.meta.client && canLoadClientComponent.value) {
+            } else if (selectiveClient && import.meta.client && canLoadClientComponent.value) {
               for (const [id, info] of Object.entries(payloads.components ?? {})) {
-                const { props } = info
+                const { props, slots } = info
                 const component = components!.get(id)!
                 // use different selectors for even and odd teleportKey to force trigger the teleport
                 const vnode = createVNode(Teleport, { to: `${isKeyOdd ? 'div' : ''}[data-island-uid='${uid.value}'][data-island-component="${id}"]` }, {
                   default: () => {
-                    return [h(component, props)]
+                    return [h(component, props, Object.fromEntries(Object.entries(slots || {}).map(([k, v]) => ([k, () => createStaticVNode(`<div style="display: contents" data-island-uid data-island-slot="${k}">${v}</div>`, 1)
+                    ]))))]
                   }
                 })
                 teleports.push(vnode)

packages/nuxt/src/app/components/nuxt-teleport-island-component.ts

@@ -1,5 +1,5 @@
-import type { Component } from 'vue'
-import { Teleport, defineComponent, h } from 'vue'
+import type { Component, InjectionKey } from 'vue'
+import { Teleport, defineComponent, h, inject, provide } from 'vue'
 import { useNuxtApp } from '../nuxt'
 // @ts-expect-error virtual file
 import { paths } from '#build/components-chunk'
@@ -9,6 +9,8 @@ type ExtendedComponent = Component & {
   __name: string
 }
 
+export const NuxtTeleportIslandSymbol = Symbol('NuxtTeleportIslandComponent') as InjectionKey<false | string>
+
 /**
  * component only used with componentsIsland
  * this teleport the component in SSR only if it needs to be hydrated on client
@@ -37,8 +39,10 @@ export default defineComponent({
   setup (props, { slots }) {
     const nuxtApp = useNuxtApp()
 
-    if (!nuxtApp.ssrContext?.islandContext || !props.nuxtClient) { return () => slots.default!() }
+    // if there's already a teleport parent, we don't need to teleport or to render the wrapped component client side
+    if (!nuxtApp.ssrContext?.islandContext || !props.nuxtClient || inject(NuxtTeleportIslandSymbol, false)) { return () => slots.default?.() }
 
+    provide(NuxtTeleportIslandSymbol, props.to)
     const islandContext = nuxtApp.ssrContext!.islandContext!
 
     return () => {

packages/nuxt/src/app/components/nuxt-teleport-island-slot.ts

@@ -1,6 +1,8 @@
-import { Teleport, defineComponent, h } from 'vue'
+import type { VNode } from 'vue'
+import { Teleport, createVNode, defineComponent, h, inject } from 'vue'
 import { useNuxtApp } from '../nuxt'
-
+import { NuxtTeleportIslandSymbol } from './nuxt-teleport-island-component'
+
 /**
  * component only used within islands for slot teleport
  */
@@ -9,37 +11,50 @@ export default defineComponent({
   name: 'NuxtTeleportIslandSlot',
   props: {
     name: {
-        type: String,
-        required: true
+      type: String,
+      required: true
     },
     /**
      * must be an array to handle v-for
      */
     props: {
-        type: Object as () => Array<any>
+      type: Object as () => Array<any>
     }
   },
   setup (props, { slots }) {
     const nuxtApp = useNuxtApp()
     const islandContext = nuxtApp.ssrContext?.islandContext
-
-    if(!islandContext) {
-      return () => slots.default?.()
+    if (!islandContext) {
+      return () => slots.default?.()[0]
     }
 
+    const componentName = inject(NuxtTeleportIslandSymbol, false)
     islandContext.slots[props.name] = {
-      props: (props.props ||  []) as unknown[]
+      props: (props.props || []) as unknown[]
     }
 
     return () => {
-      const vnodes = [h('div', {
-        style: 'display: contents;',
-        'data-island-uid': '',
-        'data-island-slot': props.name,
-      })]
+      const vnodes: VNode[] = []
+
+      if (nuxtApp.ssrContext?.islandContext && slots.default) {
+        vnodes.push(h('div', {
+          style: 'display: contents;',
+          'data-island-uid': '',
+          'data-island-slot': props.name,
+        }, {
+          // Teleport in slot to not be hydrated client-side with the staticVNode
+          default: () => [createVNode(Teleport, { to: `island-slot=${componentName};${props.name}` }, slots.default?.())]
+        }))
+      } else {
+        vnodes.push(h('div', {
+          style: 'display: contents;',
+          'data-island-uid': '',
+          'data-island-slot': props.name,
+        }))
+      }
 
       if (slots.fallback) {
-        vnodes.push(h(Teleport, { to: `island-fallback=${props.name}`}, slots.fallback()))
+        vnodes.push(h(Teleport, { to: `island-fallback=${props.name}` }, slots.fallback()))
       }
 
       return vnodes

packages/nuxt/src/components/islandsTransform.ts

@@ -21,7 +21,7 @@ interface ServerOnlyComponentTransformPluginOptions {
   /**
    * allow using `nuxt-client` attribute on components
    */
-  selectiveClient?: boolean
+  selectiveClient?: boolean | 'deep'
 }
 
 interface ComponentChunkOptions {
@@ -47,6 +47,7 @@ export const islandsTransform = createUnplugin((options: ServerOnlyComponentTran
     enforce: 'pre',
     transformInclude (id) {
       if (!isVue(id)) { return false }
+      if (options.selectiveClient === 'deep') { return true }
       const components = options.getComponents()
 
       const islands = components.filter(component =>

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

@@ -70,6 +70,7 @@ export interface NuxtIslandClientResponse {
   html: string
   props: unknown
   chunk: string
+  slots?: Record<string, string>
 }
 
 export interface NuxtIslandResponse {
@@ -629,14 +630,15 @@ function getServerComponentHTML (body: string[]): string {
 
 const SSR_SLOT_TELEPORT_MARKER = /^uid=([^;]*);slot=(.*)$/
 const SSR_CLIENT_TELEPORT_MARKER = /^uid=([^;]*);client=(.*)$/
+const SSR_CLIENT_SLOT_MARKER = /^island-slot=(?:[^;]*);(.*)$/
 
 function getSlotIslandResponse (ssrContext: NuxtSSRContext): NuxtIslandResponse['slots'] {
   if (!ssrContext.islandContext) { return {} }
   const response: NuxtIslandResponse['slots'] = {}
   for (const slot in ssrContext.islandContext.slots) {
     response[slot] = {
       ...ssrContext.islandContext.slots[slot],
-      fallback: ssrContext.teleports?.[`island-fallback=${slot}`]
+      fallback: ssrContext.teleports?.[`island-fallback=${slot}`],
     }
   }
   return response
@@ -645,16 +647,33 @@ function getSlotIslandResponse (ssrContext: NuxtSSRContext): NuxtIslandResponse[
 function getClientIslandResponse (ssrContext: NuxtSSRContext): NuxtIslandResponse['components'] {
   if (!ssrContext.islandContext) { return {} }
   const response: NuxtIslandResponse['components'] = {}
+
   for (const clientUid in ssrContext.islandContext.components) {
     const html = ssrContext.teleports?.[clientUid] || ''
     response[clientUid] = {
       ...ssrContext.islandContext.components[clientUid],
       html,
+      slots: getComponentSlotTeleport(ssrContext.teleports ?? {})
     }
   }
   return response
 }
 
+function getComponentSlotTeleport (teleports: Record<string, string>) {
+  const entries = Object.entries(teleports)
+  const slots: Record<string, string> = {}
+
+  for (const [key, value] of entries) {
+    const match = key.match(SSR_CLIENT_SLOT_MARKER)
+    if (match) {
+      const [, slot] = match
+      if (!slot) { continue }
+      slots[slot] = value
+    }
+  }
+  return slots
+}
+
 function replaceIslandTeleports (ssrContext: NuxtSSRContext, html: string) {
   const { teleports, islandContext } = ssrContext
 

packages/nuxt/src/core/templates.ts

@@ -386,7 +386,7 @@ export const nuxtConfigTemplate: NuxtTemplate = {
       `export const cookieStore = ${!!ctx.nuxt.options.experimental.cookieStore}`,
       `export const appManifest = ${!!ctx.nuxt.options.experimental.appManifest}`,
       `export const remoteComponentIslands = ${typeof ctx.nuxt.options.experimental.componentIslands === 'object' && ctx.nuxt.options.experimental.componentIslands.remoteIsland}`,
-      `export const selectiveClient = ${typeof ctx.nuxt.options.experimental.componentIslands === 'object' && ctx.nuxt.options.experimental.componentIslands.selectiveClient}`,
+      `export const selectiveClient = ${typeof ctx.nuxt.options.experimental.componentIslands === 'object' && Boolean(ctx.nuxt.options.experimental.componentIslands.selectiveClient)}`,
       `export const devPagesDir = ${ctx.nuxt.options.dev ? JSON.stringify(ctx.nuxt.options.dir.pages) : 'null'}`,
       `export const devRootDir = ${ctx.nuxt.options.dev ? JSON.stringify(ctx.nuxt.options.rootDir) : 'null'}`,
       `export const nuxtLinkDefaults = ${JSON.stringify(ctx.nuxt.options.experimental.defaults.nuxtLink)}`,

test/basic.test.ts

@@ -1610,6 +1610,12 @@ describe('server components/islands', () => {
     // test islands wrapped with client-only
     expect(await page.locator('#wrapped-client-only').innerHTML()).toContain('Was router enabled')
 
+    if (!isWebpack) {
+      // test nested client components
+      await page.locator('.server-with-nested-client button').click()
+      expect(await page.locator('.server-with-nested-client .sugar-counter').innerHTML()).toContain('Sugar Counter 13 x 1 = 13')
+    }
+
     if (!isWebpack) {
       // test client component interactivity
       expect(await page.locator('.interactive-component-wrapper').innerHTML()).toContain('Sugar Counter 12')
@@ -1667,9 +1673,9 @@ describe('server components/islands', () => {
     const text = (await page.innerText('pre')).replaceAll(/ data-island-uid="([^"]*)"/g, '').replace(/data-island-component="([^"]*)"/g, (_, content) => `data-island-component="${content.split('-')[0]}"`)
 
     if (isWebpack) {
-      expect(text).toMatchInlineSnapshot('" End page <pre></pre><section id="fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"></div><!--]--></div></section><section id="no-fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"></div><!--]--></div></section><div> ServerWithClient.server.vue : <p>count: 0</p> This component should not be preloaded <div><!--[--><div>a</div><div>b</div><div>c</div><!--]--></div> This is not interactive <div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><div class="interactive-component-wrapper" style="border:solid 1px red;"> The component bellow is not a slot but declared as interactive <div class="sugar-counter" nuxt-client=""> Sugar Counter 12 x 1 = 12 <button> Inc </button></div></div></div>"')
+      expect(text).toMatchInlineSnapshot(`" End page <pre></pre><section id="fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--></div></section><section id="no-fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--></div></section><div> ServerWithClient.server.vue : <p>count: 0</p> This component should not be preloaded <div><!--[--><div>a</div><div>b</div><div>c</div><!--]--></div> This is not interactive <div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><div class="interactive-component-wrapper" style="border:solid 1px red;"> The component bellow is not a slot but declared as interactive <div class="sugar-counter" nuxt-client=""> Sugar Counter 12 x 1 = 12 <button> Inc </button></div></div></div>"`)
     } else {
-      expect(text).toMatchInlineSnapshot(`" End page <pre></pre><section id="fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"></div><!--]--></div></section><section id="no-fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"></div><!--]--></div></section><div> ServerWithClient.server.vue : <p>count: 0</p> This component should not be preloaded <div><!--[--><div>a</div><div>b</div><div>c</div><!--]--></div> This is not interactive <div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><div class="interactive-component-wrapper" style="border:solid 1px red;"> The component bellow is not a slot but declared as interactive <!--[--><div style="display: contents;" data-island-component="Counter"></div><!--teleport start--><!--teleport end--><!--]--></div></div>"`)
+      expect(text).toMatchInlineSnapshot(`" End page <pre></pre><section id="fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--></div></section><section id="no-fallback"><div> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">42</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--></div></section><div> ServerWithClient.server.vue : <p>count: 0</p> This component should not be preloaded <div><!--[--><div>a</div><div>b</div><div>c</div><!--]--></div> This is not interactive <div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><div class="interactive-component-wrapper" style="border:solid 1px red;"> The component bellow is not a slot but declared as interactive <!--[--><div style="display: contents;" data-island-component="Counter"></div><!--teleport start--><!--teleport end--><!--]--></div></div>"`)
     }
     expect(text).toContain('async component that was very long')
 
@@ -1928,7 +1934,7 @@ describe('component islands', () => {
           "link": [],
           "style": [],
         },
-        "html": "<div data-island-uid><div> count is above 2 </div><!--[--><div style="display: contents;" data-island-uid data-island-slot="default"></div><!--]--> that was very long ... <div id="long-async-component-count">3</div>  <!--[--><div style="display: contents;" data-island-uid data-island-slot="test"></div><!--]--><p>hello world !!!</p><!--[--><div style="display: contents;" data-island-uid data-island-slot="hello"></div><!--teleport start--><!--teleport end--><!--]--><!--[--><div style="display: contents;" data-island-uid data-island-slot="fallback"></div><!--teleport start--><!--teleport end--><!--]--></div>",
+        "html": "<div data-island-uid><div> count is above 2 </div><!--[--><div style="display: contents;" data-island-uid data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--> that was very long ... <div id="long-async-component-count">3</div>  <!--[--><div style="display: contents;" data-island-uid data-island-slot="test"><!--teleport start--><!--teleport end--></div><!--]--><p>hello world !!!</p><!--[--><div style="display: contents;" data-island-uid data-island-slot="hello"><!--teleport start--><!--teleport end--></div><!--teleport start--><!--teleport end--><!--]--><!--[--><div style="display: contents;" data-island-uid data-island-slot="fallback"><!--teleport start--><!--teleport end--></div><!--teleport start--><!--teleport end--><!--]--></div>",
         "slots": {
           "default": {
             "props": [],
@@ -1992,7 +1998,7 @@ describe('component islands', () => {
           "link": [],
           "style": [],
         },
-        "html": "<div data-island-uid> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">2</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-uid data-island-slot="default"></div><!--]--></div>",
+        "html": "<div data-island-uid> This is a .server (20ms) async component that was very long ... <div id="async-server-component-count">2</div><div class="sugar-counter"> Sugar Counter 12 x 1 = 12 <button> Inc </button></div><!--[--><div style="display: contents;" data-island-uid data-island-slot="default"><!--teleport start--><!--teleport end--></div><!--]--></div>",
         "props": {},
         "slots": {},
         "state": {},

test/fixtures/basic/components/CounterWithNuxtClient.vue

@@ -0,0 +1,9 @@
+<template>
+  <div>
+    this is a normal component within a server component
+    <Counter
+      nuxt-client
+      :multiplier="1"
+    />
+  </div>
+</template>

test/fixtures/basic/components/ServerWithNestedClient.server.vue

@@ -0,0 +1,5 @@
+<template>
+  <div class="server-with-nested-client">
+    <CounterWithNuxtClient />
+  </div>
+</template>

test/fixtures/basic/nuxt.config.ts

@@ -211,7 +211,7 @@ export default defineNuxtConfig({
     restoreState: true,
     clientNodeCompat: true,
     componentIslands: {
-      selectiveClient: true
+      selectiveClient: 'deep'
     },
     treeshakeClientOnly: true,
     asyncContext: process.env.TEST_CONTEXT === 'async',

test/fixtures/basic/pages/islands.vue

@@ -110,6 +110,7 @@ const count = ref(0)
       </div>
     </div>
     <ServerWithClient />
+    <ServerWithNestedClient />
   </div>
 </template>