For those running into the error: Your application tried to access @babel/core, but it isn't declared in your dependencies; this makes the require call ambiguous and unsound.

[matthijsgroen]

If you ar using Yarn 2+ and pnp, you can do the following:

yarn add --dev @babel/core @babel/preset-react

and (if needed) add to your .yarnrc.yaml:

packageExtensions:
  "vite-plugin-markdown@*":
    dependencies:
      "@babel/core": "7.23.9"
      "@babel/preset-react": "7.23.3"