Vue Server Entrypoint Configuration

This challenge focuses on setting up a basic server-side rendering (SSR) entry point for a Vue.js application using TypeScript. This is a fundamental step for optimizing performance, improving SEO, and enabling features like server-side data fetching. You will create the server-specific logic that boots your Vue app on the server.

Problem Description

Your task is to create a TypeScript file that serves as the server entry point for a Vue.js application. This entry point will be responsible for creating and rendering a Vue application instance on the server.

Key Requirements:

• Vue Instance Creation: Instantiate a Vue application on the server.
• SSR Rendering: Render the Vue application to an HTML string.
• Context Handling (Basic): Assume a simple global context (e.g., initial state) might be passed to the server-rendered app. You don't need to implement complex state hydration for this challenge, just the mechanism for passing it.
• TypeScript: The solution must be written entirely in TypeScript.
• Modularity: The server entry point should be exportable to be used by a server framework (like Express or Koa, though you don't need to implement the server framework itself).

Expected Behavior:

When this server entry point is executed, it should produce an HTML string representing the rendered Vue application.

Edge Cases to Consider:

• No Initial State: The entry point should gracefully handle cases where no initial state is provided.

Examples

Example 1:

Let's assume a very simple Vue component:

<!-- App.vue -->
<template>
  <div>
    <h1>Hello, {{ name }}!</h1>
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';

export default defineComponent({
  props: {
    name: {
      type: String,
      required: true
    }
  }
});
</script>

And you have a way to pass props to the root component.

Input to the server entry point (hypothetical):

const initialState = { name: 'World' };

Expected Output (HTML string):

<div data-server-rendered="true">
  <div>
    <h1>Hello, World!</h1>
  </div>
</div>

Explanation:

The App.vue component is rendered on the server with the name prop set to "World", resulting in the above HTML output. The data-server-rendered="true" attribute is automatically added by Vue.

Example 2:

Input to the server entry point (hypothetical):

// No initial state provided

Expected Output (HTML string):

<div data-server-rendered="true">
  <div>
    <h1>Hello, !</h1>
  </div>
</div>

Explanation:

If no initial state is provided, the name prop defaults to an empty string (or whatever the component's default prop behavior dictates, assuming no default is specified here), leading to "Hello, !" in the output.

Constraints

• You must use the Vue 3 Composition API or Options API with TypeScript.
• The primary output of your server entry point function should be a Promise that resolves to an HTML string.
• You do not need to implement any server-side routing. Assume a single root component for the application.
• You don't need to set up a bundler or actual server environment; focus on the TypeScript code for the entry point.

Notes

• You will likely need to import createSSRApp from vue.
• Consider how you would pass initial data to your Vue application when it's created on the server.
• The goal is to demonstrate understanding of the server-side creation and rendering process in Vue with TypeScript.
• Think about how your server entry point function would be structured to accept an optional context or initial state.