Custom provider errors on nuxt-ui:3.0.0-alpha.6

[kofeinstyle]

A few days ago, I installed version nuxt-ui:3.0.0-alpha.6, and when I tried to connect my provider as described in the Nuxt Fonts documentation, I encountered build errors.

I conducted an experiment on a clean project and got the same result. Where is my mistake? Or is it a documentation mistake?

nuxt.config.ts

export default defineNuxtConfig({
  compatibilityDate: '2024-04-03',
  devtools: { enabled: true },
  modules: [
    '@nuxt/ui',
  ],
  fonts: {
    experimental: {
    //   // Required for TailwindCSS v4. You can enable support for processing CSS variables for font family names. This may have a performance impact.
      processCSSVariables: true,
    },
    providers: {
      // You can pass a new custom provider - see more in the providers documentation
      // for what this file should look like
      custom: '~/providers/custom',
    },
  },
})

custom.ts

import { defineFontProvider } from 'unifont';

export default defineFontProvider('custom', async (options) => {
    // do some setup
    return {
      async resolveFont (fontFamily, options) {
      
        if (fontFamily === 'TT Fors') {
          return {
            fonts: [
              {
                src: [
                  { url: '//my-cdn.cloudfront.net/fonts/TTFors/TTFors-Medium.woff2', format: 'woff2' },
                ],
                weight: 500,
                style: 'normal',
              }
            ]
          }
        }
      }
    }
  })

package.json

{
  "name": "nuxt-app",
  "private": true,
  "type": "module",
  "scripts": {
    "build": "nuxt build",
    "dev": "nuxt dev",
    "generate": "nuxt generate",
    "preview": "nuxt preview",
    "postinstall": "nuxt prepare"
  },
  "dependencies": {
    "@nuxt/ui": "^3.0.0-alpha.6",
    "nuxt": "^3.13.0",
    "vue": "latest",
    "vue-router": "latest"
  }
}