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headTags are empty when using pipeToWebWritable #27

@daliborgogic

Description

@daliborgogic
import { createHead, useHead } from '@unhead/vue'
import { createSSRApp, ref } from 'vue'
import { pipeToWebWritable } from '@vue/server-renderer'
import { renderSSRHead } from '@unhead/ssr'
import { describe, it, expect } from 'vitest'

const template = String.raw`<!doctype html><html lang="en"><!--head--><div id="app"><!--app--></div></html>`

describe('vue ssr', () => {
  it('pipeToWebWritable', async () => {
    const head = createHead()
    const app = createSSRApp({
      async setup() {
        const title = ref('initial title')
        useHead({
          title,
        })
        await new Promise(resolve => setTimeout(resolve, 200))
        title.value = 'new title'
        return () => '<div>hi</div>'
      },
    })
    app.use(head)

    const [prepend, append] = template.split('<!--app-->')
    const { headTags } = await renderSSRHead(head)
    const encoder = new TextEncoder()

    const { writable } = new TransformStream({
      start(controller) {
        // prepend.replace('<!--head-->', headTags)
        controller.enqueue(encoder.encode(prepend))
      },
      flush(controller) {
        controller.enqueue(encoder.encode(append))
      }
    })

    pipeToWebWritable(app, {}, writable)

    expect(headTags).eq('<title>new title</title>')
  })
})
 ❯ test/stream.test.js:29:22
     27|     await pipeToWebWritable(app, {}, writable)
     28| 
     29|     expect(headTags).eq('<title>new title</title>')
       |                      ^
     30|   })
     31| })
-    Expected   "<title>new title</title>"
+    Received   ""

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