'netlify dev' doesn't show styling, and javascript doesn't work

Hi guys, I’m using Next JS. Command “netlify dev” doesn’t work with styling and javascript/functions.
If you look at the image, I’m using package i18n which appends the ‘en’ at the end of my domain.

I can’t even console.log from a button??
Sorry, I really don’t know what else to say. Any help would be appreciated!

console.log() from a button should be in your browser’s dev tools, not Netlify CLI.

Regarding styling, what errors are you getting in the dev tools? Are these assets working on localhost:3000?