Make sure you're using npm v8 which this project is built upon.
If you don't have any correspoding node version like node v16 for this,
we recommend you to use nvm to switch to a correspoding node version.
This project adopts the structure of the experimental app directory to migrate to it smootly
when the feature will be officially released.
But it does only partially because it doesn't work with Emotion or mui that this project will use.
@see vercel/next.js#41994 (comment)
And the partial usages are:
- Where to put the components for layout of the app.
- Where to put trivial application components