[v4] Sources are not being taken into consideration with Next.js 15 #15876
Description
Tailwind: 4.0.0
Next.js: 15.1.6
MacOS: Sequoia 15.2
Node: v22.13.1
pnpm: 9.15.3
Arc Browser: 1.79.0
Reproduction URL
https://github.com/AssisrMatheus/tailwindv4-next15-no-output-repro
Setup process:
pnpx create-next-app@latestpnpx @tailwindcss/upgrade@nextpnpm run dev
Describe your issue
In a brand new next.js 15 project. Tailwind v4 is only building base css and theme variables, all classes used within source files are ignored.
I have tried to turn off turbopack with no success. Rolling back node to v20 also doesn't help. Tried using postcss.config.json file format instead of current one also with no success.
Current behaviour:
Expected behaviour:
