Vue.js - Package app as Figma Plugin using Vite

Question

I have a Vue.js app that I created with Vite. This app successfully runs when I use npm run dev and visit the app in the browser. Now, I'm trying to bundle the app as a single code file so that I can use it as a plugin for Figma.

I know that the index.html page loads because I can edit the HTML and see the changes. However, the page isn't loading/running the Vue.js app itself. I can see the following warning in the console log:

<link rel=modulepreload> has no 'href' value

My project is structured like this:

/
  /dist
    /assets
      index.a386f87b.css
      index.dc441194.js
      vendor.fbe8b50a.js
    index.html
    manifest.json
    plugin.js
  /src
    /views
      Index.vue
      Items.vue
      Calendar.vue
    /res
      /css
        theme.css
      /images
        loading.gif
        splash.jpeg
   App.vue
   main.js
   index.html

When I look at the index.html file in the dist directory, I see:

<script type="module" crossorigin src="/assets/index.dc441194.js"></script>
<link rel="modulepreload" href="/assets/vendor.fbe8b50a.js">
<link rel="stylesheet" href="/assets/index.a386f87b.css">
<div id="app" class="position-absolute top-0 left-0 vh-100 vw-100"></div>

The references look correct. However, clearly something is wrong as the app is not loading as a plugin in Figma. Once again, I know I'm successfully loading the index.html file because if I manually edit it, the changes appear in the plugin. This leads me to bundling the app as a single code file. At this point, I'm stuck though. I don't see a way to accomplish this via Vite's built-in capabilities. I tried including the vite-plugin-singlefile plugin. Unfortunately that didn't work for me either. Currently, my vite.config.js file looks like this:

import { defineConfig } from 'vite'

import vue from '@vitejs/plugin-vue';

export default defineConfig(({command, mode }) => {
  return {
    assetsDir: 'res',
    plugins: [
      vue(),
    ],
    root: 'src',
    build: {
      emptyOutDir: true,
      outDir: '../dist'
    }
  }
});

What am I doing wrong?

Answer 1

Figma ignores <script>.src and <link>.href, which aligns with the docs you linked, stating "all the code must be in one file".

Using vite-plugin-singlefile (as you mentioned) to inline all scripts and styles in index.html indeed seems to workaround the problem:

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import { viteSingleFile } from 'vite-plugin-singlefile'

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [vue(), viteSingleFile()],
  build: {
    cssCodeSplit: false,
    assetsInlineLimit: 100000000,
    rollupOptions: {
      output: {
        manualChunks: () => "everything.js",
      },
    },
  }
})

demo