What I'm doing & what's wrong

I'm working on a new project (GitHub repo) and when I'm trying to run a local dev server I'm getting this error:

> jakub-suchenek@1.1.0 dev
> nuxt


   ╭───────────────────────────────────────╮
   │                                       │
   │   Nuxt @ v2.15.7                      │
   │                                       │
   │   ▸ Environment: development          │
   │   ▸ Rendering:   server-side          │
   │   ▸ Target:      server               │
   │                                       │
   │   Listening: http://localhost:3000/   │
   │                                       │
   ╰───────────────────────────────────────╯

i Preparing project for development                                                                           19:29:23
i Initial build may take a while                                                                              19:29:23
i Discovered Components: .nuxt/components/readme.md                                                           19:29:23
√ Builder initialized                                                                                         19:29:23

 ERROR  The "path" argument must be of type string. Received undefined                                        19:29:23

  at new NodeError (node:internal/errors:371:5)
  at validateString (node:internal/validators:119:11)
  at Object.extname (node:path:837:5)
  at node_modules\@nuxt\builder\dist\builder.js:413:98
  at Array.map (<anonymous>)
  at Builder.normalizePlugins (node_modules\@nuxt\builder\dist\builder.js:409:28)
  at async Builder.generateRoutesAndFiles (node_modules\@nuxt\builder\dist\builder.js:371:31)
  at async Builder.build (node_modules\@nuxt\builder\dist\builder.js:319:5)
  at async Object._buildDev (node_modules\@nuxt\cli\dist\cli-dev.js:107:5)
  at async Object.startDev (node_modules\@nuxt\cli\dist\cli-dev.js:65:7)
  at async Object.run (node_modules\@nuxt\cli\dist\cli-dev.js:52:5)
  at async NuxtCommand.run (node_modules\@nuxt\cli\dist\cli-index.js:413:7)

But this occurs only when I have this in my nuxt.config.js file:

plugins: [ "@babel/plugin-proposal-private-property-in-object", { "loose": true }],

Without this plugin config, I have A LOT of spam in the console.

plugins: [],

A few hundred times:

 WARN  Though the "loose" option was set to "false" in your @babel/preset-env config, it will not be used for @babel/plugin-proposal-private-property-in-object since the "loose" mode option was set to "true" for @babel/plugin-proposal-private-methods.
The "loose" option must be the same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding
        ["@babel/plugin-proposal-private-property-in-object", { "loose": true }]
to the "plugins" section of your Babel config.

What I've tried

1. Changing Nuxt.js version (2.15, 2.14, 2.13).
2. Reinstalling node packages.

My question

What is the best solution for this? To do not have console spam with "WARN" and have a working app.

Or is there no solution? According to this post, for now there's no way to do not have these awful WARN errors in the console.

My code:

(open-sourced on GitHub)

• nuxt.config.js
• package.json