wip

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

@@ -12,7 +12,7 @@ import { join } from 'pathe'
 // eslint-disable-next-line import/no-restricted-paths
 import type { NuxtIslandResponse } from '../../core/runtime/nitro/renderer'
 import { useNuxtApp, useRuntimeConfig } from '../nuxt'
-import { prerenderRoutes, useRequestEvent } from '../composables/ssr'
+import { useRequestEvent } from '../composables/ssr'
 import { getFragmentHTML, getSlotProps } from './utils'
 
 // @ts-expect-error virtual file
@@ -25,9 +25,9 @@ const SLOTNAME_RE = /nuxt-ssr-slot-name="([^"]*)"/g
 const SLOT_FALLBACK_RE = /<div nuxt-slot-fallback-start="([^"]*)"[^>]*><\/div>(((?!<div nuxt-slot-fallback-end[^>]*>)[\s\S])*)<div nuxt-slot-fallback-end[^>]*><\/div>/g
 
 let id = 0
-const getId = import.meta.client ? () => (id++).toString() : randomUUID
+const getId = () => (id++).toString()
 
-const components = import.meta.client ? new Map<string, Component>() : undefined
+const components = new Map<string, Component>()
 
 async function loadComponents (source = '/', paths: Record<string, string>) {
   const promises = []
@@ -86,10 +86,9 @@ export default defineComponent({
     const filteredProps = computed(() => props.props ? Object.fromEntries(Object.entries(props.props).filter(([key]) => !key.startsWith('data-v-'))) : {})
     const hashId = computed(() => hash([props.name, filteredProps.value, props.context, props.source]))
     const instance = getCurrentInstance()!
-    const event = useRequestEvent()
 
     // TODO: remove use of `$fetch.raw` when nitro 503 issues on windows dev server are resolved
-    const eventFetch = import.meta.server ? event.fetch : import.meta.dev ? $fetch.raw : globalThis.fetch
+    const eventFetch = import.meta.dev ? $fetch.raw : globalThis.fetch
     const mounted = ref(false)
     onMounted(() => { mounted.value = true })
 
@@ -97,9 +96,7 @@ export default defineComponent({
       nuxtApp.payload.data[key] = {
         __nuxt_island: {
           key,
-          ...(import.meta.server && import.meta.prerender)
-            ? {}
-            : { params: { ...props.context, props: props.props ? JSON.stringify(props.props) : undefined } },
+            params: { ...props.context, props: props.props ? JSON.stringify(props.props) : undefined } ,
           result: {
             chunks: result.chunks,
             props: result.props,
@@ -120,11 +117,7 @@ export default defineComponent({
       teleports: rawPayload.teleports
     }
 
-    const ssrHTML = ref<string>('')
-
-    if (import.meta.client) {
-      ssrHTML.value = getFragmentHTML(instance.vnode?.el ?? null, true)?.join('') || ''
-    }
+    const ssrHTML = ref<string>(getFragmentHTML(instance.vnode?.el ?? null, true)?.join('') || '')
 
     const slotProps = computed(() => getSlotProps(ssrHTML.value))
     const uid = ref<string>(ssrHTML.value.match(SSR_UID_RE)?.[1] ?? getId())
@@ -134,7 +127,7 @@ export default defineComponent({
       const currentSlots = Object.keys(slots)
       let html = ssrHTML.value
 
-      if (import.meta.client && !canLoadClientComponent.value) {
+      if (!canLoadClientComponent.value) {
         for (const [key, value] of Object.entries(nonReactivePayload.teleports || {})) {
           html = html.replace(new RegExp(`<div [^>]*nuxt-ssr-client="${key}"[^>]*>`), (full) => {
             return full + value
@@ -165,24 +158,14 @@ export default defineComponent({
 
       const url = remoteComponentIslands && props.source ? new URL(`/__nuxt_island/${key}.json`, props.source).href : `/__nuxt_island/${key}.json`
 
-      if (import.meta.server && import.meta.prerender) {
-        // Hint to Nitro to prerender the island component
-        nuxtApp.runWithContext(() => prerenderRoutes(url))
-      }
       // TODO: Validate response
       // $fetch handles the app.baseURL in dev
-      const r = await eventFetch(withQuery(((import.meta.dev && import.meta.client) || props.source) ? url : joinURL(config.app.baseURL ?? '', url), {
+      const r = await eventFetch(withQuery((import.meta.dev || props.source) ? url : joinURL(config.app.baseURL ?? '', url), {
         ...props.context,
         props: props.props ? JSON.stringify(props.props) : undefined
       }))
-      const result = import.meta.server || !import.meta.dev ? await r.json() : (r as FetchResponse<NuxtIslandResponse>)._data
-      // TODO: support passing on more headers
-      if (import.meta.server && import.meta.prerender) {
-        const hints = r.headers.get('x-nitro-prerender')
-        if (hints) {
-          appendResponseHeader(event, 'x-nitro-prerender', hints)
-        }
-      }
+      const result = import.meta.dev ? (r as FetchResponse<NuxtIslandResponse>)._data : await r.json()
+
       setPayload(key, result)
       return result
     }
@@ -204,7 +187,7 @@ export default defineComponent({
         key.value++
         error.value = null
 
-        if (selectiveClient && import.meta.client) {
+        if (selectiveClient) {
           if (canLoadClientComponent.value && res.chunks) {
             await loadComponents(props.source, res.chunks)
           }
@@ -213,10 +196,9 @@ export default defineComponent({
         nonReactivePayload.teleports = res.teleports
         nonReactivePayload.chunks = res.chunks
 
-        if (import.meta.client) {
         // must await next tick for Teleport to work correctly with static node re-rendering
         await nextTick()
-        }
+       
         setUid()
       } catch (e) {
         error.value = e
@@ -233,13 +215,11 @@ export default defineComponent({
       })
     }
 
-    if (import.meta.client) {
     watch(props, debounce(() => fetchComponent(), 100))
-    }
  
-    if (import.meta.client && !nuxtApp.isHydrating && props.lazy) {
+    if (!nuxtApp.isHydrating && props.lazy) {
       fetchComponent()
-    } else if (import.meta.server || !nuxtApp.isHydrating || !nuxtApp.payload.serverRendered) {
+    } else if (!nuxtApp.isHydrating || !nuxtApp.payload.serverRendered) {
       await fetchComponent()
     } else if (selectiveClient && canLoadClientComponent.value && nonReactivePayload.chunks) {
       await loadComponents(props.source, nonReactivePayload.chunks)
@@ -253,22 +233,15 @@ export default defineComponent({
         key: key.value
       }, [h(createStaticVNode(html.value || '<div></div>', 1))])]
 
-      if (uid.value && (mounted.value || nuxtApp.isHydrating || import.meta.server) && html.value) {
+      if (uid.value && (mounted.value || nuxtApp.isHydrating) && html.value) {
         for (const slot in slots) {
           if (availableSlots.value.includes(slot)) {
-            nodes.push(createVNode(Teleport, { to: import.meta.client ? `[nuxt-ssr-component-uid='${uid.value}'] [nuxt-ssr-slot-name='${slot}']` : `uid=${uid.value};slot=${slot}` }, {
+            nodes.push(createVNode(Teleport, { to:  `[nuxt-ssr-component-uid='${uid.value}'] [nuxt-ssr-slot-name='${slot}']` }, {
               default: () => (slotProps.value[slot] ?? [undefined]).map((data: any) => slots[slot]?.(data))
             }))
           }
         }
-        if (import.meta.server) {
-          for (const [id, html] of Object.entries(nonReactivePayload.teleports ?? {})) {
-            nodes.push(createVNode(Teleport, { to: `uid=${uid.value};client=${id}` }, {
-              default: () => [createStaticVNode(html, 1)]
-            }))
-          }
-        }
-        if (selectiveClient && import.meta.client && canLoadClientComponent.value) {
+        if (selectiveClient && canLoadClientComponent.value) {
           for (const [id, props] of Object.entries(nonReactivePayload.props ?? {})) {
             const component = components!.get(id.split('-')[0])!
             const vnode = createVNode(Teleport, { to: `[nuxt-ssr-component-uid='${uid.value}'] [nuxt-ssr-client="${id}"]` }, {

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

@@ -0,0 +1,169 @@
+import { Fragment, Teleport, computed, createStaticVNode, createVNode, defineComponent, h, ref, } from 'vue'
+import { hash } from 'ohash'
+import { appendResponseHeader } from 'h3'
+import { useHead } from '@unhead/vue'
+import { randomUUID } from 'uncrypto'
+import { joinURL, withQuery } from 'ufo'
+
+// eslint-disable-next-line import/no-restricted-paths
+import type { NuxtIslandResponse } from '../../core/runtime/nitro/renderer'
+import { useNuxtApp, useRuntimeConfig } from '../nuxt'
+import { prerenderRoutes, useRequestEvent } from '../composables/ssr'
+import { getSlotProps } from './utils'
+
+// @ts-expect-error virtual file
+import { remoteComponentIslands, selectiveClient } from '#build/nuxt.config.mjs'
+
+const pKey = '_islandPromises'
+const SSR_UID_RE = /nuxt-ssr-component-uid="([^"]*)"/
+const UID_ATTR = /nuxt-ssr-component-uid(="([^"]*)")?/
+const SLOTNAME_RE = /nuxt-ssr-slot-name="([^"]*)"/g
+
+export default defineComponent({
+    name: 'NuxtIsland',
+    props: {
+        name: {
+            type: String,
+            required: true
+        },
+        lazy: Boolean,
+        props: {
+            type: Object,
+            default: () => undefined
+        },
+        context: {
+            type: Object,
+            default: () => ({})
+        },
+        source: {
+            type: String,
+            default: () => undefined
+        },
+        dangerouslyLoadClientComponents: {
+            type: Boolean,
+            default: false
+        }
+    },
+    async setup(props, { slots }) {
+        const error = ref<unknown>(null)
+        const config = useRuntimeConfig()
+        const nuxtApp = useNuxtApp()
+        const filteredProps = computed(() => props.props ? Object.fromEntries(Object.entries(props.props).filter(([key]) => !key.startsWith('data-v-'))) : {})
+        const hashId = computed(() => hash([props.name, filteredProps.value, props.context, props.source]))
+        const event = useRequestEvent()
+
+
+        function setPayload(key: string, result: NuxtIslandResponse) {
+            nuxtApp.payload.data[key] = {
+                __nuxt_island: {
+                    key,
+                    ...(import.meta.prerender)
+                        ? {}
+                        : { params: { ...props.context, props: props.props ? JSON.stringify(props.props) : undefined } },
+                    result: {
+                        chunks: result.chunks,
+                        props: result.props,
+                        teleports: result.teleports
+                    }
+                },
+                ...result
+            }
+        }
+        const nonReactivePayload: Pick<NuxtIslandResponse, 'chunks' | 'props' | 'teleports'> = {
+            chunks: {},
+            props: {},
+            teleports: {}
+        }
+
+        const ssrHTML = ref<string>('')
+
+        const slotProps = computed(() => getSlotProps(ssrHTML.value))
+        const uid = ref<string>(ssrHTML.value.match(SSR_UID_RE)?.[1] ?? randomUUID())
+        const availableSlots = computed(() => [...ssrHTML.value.matchAll(SLOTNAME_RE)].map(m => m[1]))
+
+        function setUid() {
+            uid.value = ssrHTML.value.match(SSR_UID_RE)?.[1] ?? randomUUID() as string
+        }
+
+        const cHead = ref<Record<'link' | 'style', Array<Record<string, string>>>>({ link: [], style: [] })
+        useHead(cHead)
+
+        async function _fetchComponent() {
+            const key = `${props.name}_${hashId.value}`
+
+            if (nuxtApp.payload.data[key]?.html) { return nuxtApp.payload.data[key] }
+
+            const url = remoteComponentIslands && props.source ? new URL(`/__nuxt_island/${key}.json`, props.source).href : `/__nuxt_island/${key}.json`
+
+            if (import.meta.prerender) {
+                // Hint to Nitro to prerender the island component
+                nuxtApp.runWithContext(() => prerenderRoutes(url))
+            }
+
+            // TODO: Validate response
+            const r = await event.fetch(withQuery((props.source) ? url : joinURL(config.app.baseURL ?? '', url), {
+                ...props.context,
+                props: props.props ? JSON.stringify(props.props) : undefined
+            }))
+            const result = await r.json()
+            // TODO: support passing on more headers
+            if (import.meta.prerender) {
+                const hints = r.headers.get('x-nitro-prerender')
+                if (hints) {
+                    appendResponseHeader(event, 'x-nitro-prerender', hints)
+                }
+            }
+            setPayload(key, result)
+            return result
+        }
+
+        async function fetchComponent(force = false) {
+            nuxtApp[pKey] = nuxtApp[pKey] || {}
+            if (!nuxtApp[pKey][uid.value]) {
+                nuxtApp[pKey][uid.value] = _fetchComponent().finally(() => {
+                    delete nuxtApp[pKey]![uid.value]
+                })
+            }
+            try {
+                const res: NuxtIslandResponse = await nuxtApp[pKey][uid.value]
+                cHead.value.link = res.head.link
+                cHead.value.style = res.head.style
+                ssrHTML.value = res.html.replace(UID_ATTR, () => {
+                    return `nuxt-ssr-component-uid="${randomUUID()}"`
+                })
+                nonReactivePayload.teleports = res.teleports
+                nonReactivePayload.chunks = res.chunks
+
+                setUid()
+            } catch (e) {
+                error.value = e
+            }
+        }
+
+        await fetchComponent()
+
+        return () => {
+            if (!ssrHTML.value || error.value) {
+                return [slots.fallback?.({ error: error.value }) ?? createVNode('div')]
+            }
+            const nodes = [createVNode(Fragment, {}, [h(createStaticVNode(ssrHTML.value || '<div></div>', 1))])]
+
+            // render slots and teleports
+            if (uid.value && ssrHTML.value) {
+                for (const slot in slots) {
+                    if (availableSlots.value.includes(slot)) {
+                        nodes.push(createVNode(Teleport, { to: `uid=${uid.value};slot=${slot}` }, {
+                            default: () => (slotProps.value[slot] ?? [undefined]).map((data: any) => slots[slot]?.(data))
+                        }))
+                    }
+                }
+                for (const [id, html] of Object.entries(nonReactivePayload.teleports ?? {})) {
+                    nodes.push(createVNode(Teleport, { to: `uid=${uid.value};client=${id}` }, {
+                        default: () => [createStaticVNode(html, 1)]
+                    }))
+                }
+            }
+            return nodes
+        }
+    }
+})

packages/nuxt/src/components/loader.ts

@@ -57,8 +57,9 @@ export const loaderPlugin = createUnplugin((options: LoaderOptions) => {
           const isServerOnly = !component._raw && component.mode === 'server' &&
             !components.some(c => c.pascalName === component.pascalName && c.mode === 'client')
           if (isServerOnly) {
+            imports.add(genImport(`#app/components/nuxt-island.${options.mode}`, 'NuxtIsland'))
             imports.add(genImport(serverComponentRuntime, [{ name: 'createServerComponent' }]))
-            imports.add(`const ${identifier} = createServerComponent(${JSON.stringify(name)})`)
+            imports.add(`const ${identifier} = createServerComponent(${JSON.stringify(name)}, NuxtIsland)`)
             if (!options.experimentalComponentIslands) {
               logger.warn(`Standalone server components (\`${name}\`) are not yet supported without enabling \`experimental.componentIslands\`.`)
             }

packages/nuxt/src/components/module.ts

@@ -130,11 +130,11 @@ export default defineNuxtModule<ComponentsOptions>({
     const unpluginServer = createTransformPlugin(nuxt, getComponents, 'server')
     const unpluginClient = createTransformPlugin(nuxt, getComponents, 'client')
 
-    addVitePlugin(() => unpluginServer.vite(), { server: true, client: false })
-    addVitePlugin(() => unpluginClient.vite(), { server: false, client: true })
+    addVitePlugin(() => unpluginServer.vite({ bundle: 'server'}), { server: true, client: false })
+    addVitePlugin(() => unpluginClient.vite({ bundle: 'client'}), { server: false, client: true })
 
-    addWebpackPlugin(() => unpluginServer.webpack(), { server: true, client: false })
-    addWebpackPlugin(() => unpluginClient.webpack(), { server: false, client: true })
+    addWebpackPlugin(() => unpluginServer.webpack({ bundle: 'server'}), { server: true, client: false })
+    addWebpackPlugin(() => unpluginClient.webpack({ bundle: 'client'}), { server: false, client: true })
 
     // Do not prefetch global components chunks
     nuxt.hook('build:manifest', (manifest) => {

packages/nuxt/src/components/runtime/server-component.ts

@@ -1,8 +1,12 @@
-import { defineComponent, h, ref } from 'vue'
-import NuxtIsland from '#app/components/nuxt-island'
+import { DefineComponent, defineComponent, h, ref } from 'vue'
 
+/**
+ * Since NuxtIsland is split into a server and client file
+ * we need to pass it as an argument to createServerComponent
+ * It is normally injected by transform plugins
+ */
 /*@__NO_SIDE_EFFECTS__*/
-export const createServerComponent = (name: string) => {
+export const createServerComponent = (name: string, NuxtIsland: DefineComponent) => {
   return defineComponent({
     name,
     inheritAttrs: false,

packages/nuxt/src/components/transform.ts

@@ -47,7 +47,7 @@ export function createTransformPlugin (nuxt: Nuxt, getComponents: getComponentsT
     })
   }
 
-  return createUnplugin(() => ({
+  return createUnplugin(({bundle} : {bundle: 'server'|'client'}) => ({
     name: 'nuxt:components:imports',
     transformInclude (id) {
       id = normalize(id)
@@ -88,10 +88,16 @@ export function createTransformPlugin (nuxt: Nuxt, getComponents: getComponentsT
           }
         } else if (mode === 'server' || mode === 'server,async') {
           const name = query.nuxt_component_name
+          console.log( [
+            `import NuxtIsland from "#app/components/nuxt-island.${bundle}"`,
+            `import { createServerComponent } from ${JSON.stringify(serverComponentRuntime)}`,
+            `export default createServerComponent(${JSON.stringify(name)}, NuxtIsland)`
+          ].join('\n'))
           return {
             code: [
+              `import NuxtIsland from "#app/components/nuxt-island.${bundle}"`,
               `import { createServerComponent } from ${JSON.stringify(serverComponentRuntime)}`,
-              `export default createServerComponent(${JSON.stringify(name)})`
+              `export default createServerComponent(${JSON.stringify(name)}, NuxtIsland)`
             ].join('\n'),
             map: null
           }

packages/nuxt/src/core/nuxt.ts

@@ -294,7 +294,16 @@ async function initNuxt (nuxt: Nuxt) {
     addComponent({
       name: 'NuxtIsland',
       priority: 10, // built-in that we do not expect the user to override
-      filePath: resolve(nuxt.options.appDir, 'components/nuxt-island')
+      filePath: resolve(nuxt.options.appDir, 'components/nuxt-island.server'),
+      mode: 'server',
+      _raw: true
+    })
+    addComponent({
+      name: 'NuxtIsland',
+      priority: 10, // built-in that we do not expect the user to override
+      filePath: resolve(nuxt.options.appDir, 'components/nuxt-island.client'),
+      mode: 'client',
+      _raw: true
     })
 
     if (!nuxt.options.ssr) {