Fix hydration mismatch in production builds when using the Tailwind 4 Integration Guide

[luksch42]

Fix hydration mismatch in production builds when using the Tailwind 4 Integration Guide

Added source("../") to the Tailwind import to explicitly set the base path for class detection.

Problem

• Dev server runs from project root, production build runs from a different working directory
• This causes Tailwind to scan different file sets, generating different CSS content
• Different CSS content = different content hash = hydration mismatch

Solution

@import "tailwindcss" source("../");

The source() directive tells Tailwind to always scan from ../ relative to the CSS file location, regardless of the current working directory during build.

What it points to

• In the Tailwind integration guide the path is relative to the CSS file location (app/styles/app.css → app/src/)

References

• Tailwind v4 - Setting your base path
• TanStack Start - Tailwind Integration
• shadcn/ui - TanStack Start

Without this explicit path, builds from different working directories (CI/CD, Docker, monorepo tools) will produce inconsistent CSS output.

Mentioned in https://discord.com/channels/719702312431386674/1390062434038845521

[schiller-manuel]

can you please add some more description about that. what should this point to, a link to the tailwind docs etc.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 941ac88

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	<1s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	2s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-07-17 22:29:40 UTC

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commit: 941ac88

[schiller-manuel]

can you please add some more description about that. what should this point to, a link to the tailwind docs etc.