fix(nuxt): correctly move v-if from slot to wrapper component

packages/nuxt/src/components/islandsTransform.ts

@@ -34,6 +34,7 @@ const HAS_SLOT_OR_CLIENT_RE = /(<slot[^>]*>)|(nuxt-client)/
 const TEMPLATE_RE = /<template>([\s\S]*)<\/template>/
 const NUXTCLIENT_ATTR_RE = /\s:?nuxt-client(="[^"]*")?/g
 const IMPORT_CODE = '\nimport { vforToArray as __vforToArray } from \'#app/components/utils\'' + '\nimport NuxtTeleportIslandComponent from \'#app/components/nuxt-teleport-island-component\'' + '\nimport NuxtTeleportSsrSlot from \'#app/components/nuxt-teleport-island-slot\''
+const EXTRACTED_ATTRS_RE = /v-(?:if|else-if|else)(="[^"]*")?/g
 
 function wrapWithVForDiv (code: string, vfor: string): string {
   return `<div v-for="${vfor}" style="display: contents;">${code}</div>`
@@ -79,29 +80,31 @@ export const islandsTransform = createUnplugin((options: ServerOnlyComponentTran
           if (node.name === 'slot') {
             const { attributes, children, loc } = node
 
-            // pass slot fallback to NuxtTeleportSsrSlot fallback
-            if (children.length) {
-              const attrString = Object.entries(attributes).map(([name, value]) => name ? `${name}="${value}" ` : value).join(' ')
-              const slice = code.slice(startingIndex + loc[0].end, startingIndex + loc[1].start).replaceAll(/:?key="[^"]"/g, '')
-              s.overwrite(startingIndex + loc[0].start, startingIndex + loc[1].end, `<slot ${attrString} /><template #fallback>${attributes['v-for'] ? wrapWithVForDiv(slice, attributes['v-for']) : slice}</template>`)
-            }
-
             const slotName = attributes.name ?? 'default'
-            let vfor: [string, string] | undefined
+            let vfor: string | undefined
             if (attributes['v-for']) {
-              vfor = attributes['v-for'].split(' in ').map((v: string) => v.trim()) as [string, string]
+              vfor = attributes['v-for']
             }
             delete attributes['v-for']
 
             if (attributes.name) { delete attributes.name }
             if (attributes['v-bind']) {
-              attributes._bind = attributes['v-bind']
-              delete attributes['v-bind']
+              attributes._bind = extractAttributes(attributes, ['v-bind'])['v-bind']
             }
-            const bindings = getPropsToString(attributes, vfor)
-
+            const teleportAttributes = extractAttributes(attributes, ['v-if', 'v-else-if', 'v-else'])
+            const bindings = getPropsToString(attributes, vfor?.split(' in ').map((v: string) => v.trim()) as [string, string])
             // add the wrapper
-            s.appendLeft(startingIndex + loc[0].start, `<NuxtTeleportSsrSlot name="${slotName}" :props="${bindings}">`)
+            s.appendLeft(startingIndex + loc[0].start, `<NuxtTeleportSsrSlot${attributeToString(teleportAttributes)} name="${slotName}" :props="${bindings}">`)
+
+            if (children.length) {
+              // pass slot fallback to NuxtTeleportSsrSlot fallback
+              const attrString = attributeToString(attributes)
+              const slice = code.slice(startingIndex + loc[0].end, startingIndex + loc[1].start).replaceAll(/:?key="[^"]"/g, '')
+              s.overwrite(startingIndex + loc[0].start, startingIndex + loc[1].end, `<slot${attrString.replaceAll(EXTRACTED_ATTRS_RE, '')}/><template #fallback>${vfor ? wrapWithVForDiv(slice, vfor) : slice}</template>`)
+            } else {
+              s.overwrite(startingIndex + loc[0].start, startingIndex + loc[0].end, code.slice(startingIndex + loc[0].start, startingIndex + loc[0].end).replaceAll(EXTRACTED_ATTRS_RE, ''))
+            }
+
             s.appendRight(startingIndex + loc[1].end, '</NuxtTeleportSsrSlot>')
           } else if (options.selectiveClient && ('nuxt-client' in node.attributes || ':nuxt-client' in node.attributes)) {
             hasNuxtClient = true
@@ -132,13 +135,31 @@ export const islandsTransform = createUnplugin((options: ServerOnlyComponentTran
   }
 })
 
+/**
+ * extract attributes from a node
+ */
+function extractAttributes (attributes: Record<string, string>, names: string[]) {
+  const extracted:Record<string, string> = {}
+  for (const name of names) {
+    if (name in attributes) {
+      extracted[name] = attributes[name]
+      delete attributes[name]
+    }
+  }
+  return extracted
+}
+
+function attributeToString (attributes: Record<string, string>) {
+  return Object.entries(attributes).map(([name, value]) => value ? ` ${name}="${value}"` : ` ${name}`).join('')
+}
+
 function isBinding (attr: string): boolean {
   return attr.startsWith(':')
 }
 
 function getPropsToString (bindings: Record<string, string>, vfor?: [string, string]): string {
   if (Object.keys(bindings).length === 0) { return 'undefined' }
-  const content = Object.entries(bindings).filter(b => b[0] && b[0] !== '_bind').map(([name, value]) => isBinding(name) ? `${name.slice(1)}: ${value}` : `${name}: \`${value}\``).join(',')
+  const content = Object.entries(bindings).filter(b => b[0] && b[0] !== '_bind').map(([name, value]) => isBinding(name) ? `[\`${name.slice(1)}\`]: ${value}` : `[\`${name}\`]: \`${value}\``).join(',')
   const data = bindings._bind ? `mergeProps(${bindings._bind}, { ${content} })` : `{ ${content} }`
   if (!vfor) {
     return `[${data}]`

packages/nuxt/test/islandTransform.test.ts

@@ -65,8 +65,8 @@ describe('islandTransform - server and island components', () => {
               <div>
                 <NuxtTeleportSsrSlot name="default" :props="undefined"><slot /></NuxtTeleportSsrSlot>
 
-                <NuxtTeleportSsrSlot name="named" :props="[{ some-data: someData }]"><slot name="named" :some-data="someData" /></NuxtTeleportSsrSlot>
-                <NuxtTeleportSsrSlot name="other" :props="[{ some-data: someData }]"><slot
+                <NuxtTeleportSsrSlot name="named" :props="[{ [\`some-data\`]: someData }]"><slot name="named" :some-data="someData" /></NuxtTeleportSsrSlot>
+                <NuxtTeleportSsrSlot name="other" :props="[{ [\`some-data\`]: someData }]"><slot
                   name="other"
                   :some-data="someData"
                 /></NuxtTeleportSsrSlot>
@@ -99,7 +99,7 @@ describe('islandTransform - server and island components', () => {
       expect(normalizeLineEndings(result)).toMatchInlineSnapshot(`
         "<template>
               <div>
-                <NuxtTeleportSsrSlot name="default" :props="[{ some-data: someData }]"><slot :some-data="someData"  /><template #fallback>
+                <NuxtTeleportSsrSlot name="default" :props="[{ [\`some-data\`]: someData }]"><slot :some-data="someData"/><template #fallback>
                   <div>fallback</div>
                 </template></NuxtTeleportSsrSlot>
               </div>
@@ -158,7 +158,7 @@ describe('islandTransform - server and island components', () => {
                     <p>message: {{ message }}</p>
                     <p>Below is the slot I want to be hydrated on the client</p>
                     <div>
-                      <NuxtTeleportSsrSlot name="default" :props="undefined"><slot  /><template #fallback>
+                      <NuxtTeleportSsrSlot name="default" :props="undefined"><slot/><template #fallback>
                         This is the default content of the slot, I should not see this after
                         the client loading has completed.
                       </template></NuxtTeleportSsrSlot>
@@ -183,6 +183,33 @@ describe('islandTransform - server and island components', () => {
             "
       `)
     })
+
+    it('expect v-if/v-else/v-else-if to be set in teleport component wrapper', async () => {
+      const result = await viteTransform(`<script setup lang="ts">
+      const foo = true;
+      </script>
+      <template>
+      <slot v-if="foo" />
+      <slot v-else-if="test" />
+      <slot v-else />
+      </template>
+      `, 'WithVif.vue', false, true)
+
+      expect(normalizeLineEndings(result)).toMatchInlineSnapshot(`
+        "<script setup lang="ts">
+        import { vforToArray as __vforToArray } from '#app/components/utils'
+        import NuxtTeleportIslandComponent from '#app/components/nuxt-teleport-island-component'
+        import NuxtTeleportSsrSlot from '#app/components/nuxt-teleport-island-slot'
+              const foo = true;
+              </script>
+              <template>
+              <NuxtTeleportSsrSlot v-if="foo" name="default" :props="undefined"><slot  /></NuxtTeleportSsrSlot>
+              <NuxtTeleportSsrSlot v-else-if="test" name="default" :props="undefined"><slot  /></NuxtTeleportSsrSlot>
+              <NuxtTeleportSsrSlot v-else name="default" :props="undefined"><slot  /></NuxtTeleportSsrSlot>
+              </template>
+              "
+      `)
+    })
   })
 
   describe('nuxt-client', () => {