Add a hook after rendering the vue server component to modify html content

[Groupguanfang]

Body

Summary

Now @astrojs/vue only provides an appEntrypoint attribute, which specifies the path of an entry file, and then modifies the root vue component:

// src/pages/_app.ts
import { type App } from 'vue';


export default (app: App) => {
  // Make modifications to the root vue component...
};

This function will be called here through the virtual module. This function will be called here through the virtual module. Now can we add a closure function to this function so that it can directly modify the pure html string after renderToString render in the closure function?

// src/pages/_app.ts
import { type App } from 'vue';


export default (app: App) => {
  // Make modifications to the root vue component...
  // Return a function with an html parameter. You can return the changed html string
  return (html: string): string => {
     return html + `<style>/* Such as your css, and more... */</style>`
  }
};

Background & Motivation

I using naive-ui, In naive ui, it needs to collect css through the root vue component and attach it to html, like the method in their official website: https://www.naiveui.com/en-CN/os-theme/docs/vite-ssge.

If astro implements this proposal, then it will be convenient to integrate naive ui like this:

import { type App } from 'vue';
import { setup } from '@css-render/vue3-ssr'


export default (app: App) => {
  const { collect } = setup(app)
  
  return async (html: string): Promise<string> => {
    return html + collect()
  }
};

Goals

A concise, bulleted-list outlining the intended goals of this RFC.

• Let astro fully adapt to naive ui
• Allows any user to change the generated vue html string.