nextjs - 💡(How to fix) Fix CSS prioritization [3 comments, 3 participants]

TL;DR

• The most likely fix involves ensuring consistent style prioritization between development and build modes when using Turbopack, potentially by adjusting the Next.js configuration or Turbopack settings.

Guidance

• Verify that the next.config.js file does not contain any conditional logic that could affect style loading differently in development versus build modes.
• Check the Turbopack configuration for any options that might influence style prioritization, such as stylePriority or similar settings, and ensure they are consistently applied across environments.
• Consider temporarily disabling Turbopack to see if the issue persists, which could help isolate if the problem is Turbopack-specific or related to Next.js build processes.
• Review the project's CSS files and components for any potential issues with CSS specificity or ordering that could be exacerbated by Turbopack's style bundling.

Example

No specific code example can be provided without more details on the project's configuration and codebase, but ensuring consistent import order and CSS specificity across components might help mitigate the issue.

Notes

• The non-deterministic nature of the issue, with it sometimes disappearing after removing a random folder or component, suggests that the problem might be related to how Turbopack or Next.js handles file system changes or caching during the build process.
• The fact that the issue does not occur in development mode (next dev --turbopack) but does in build mode (next build --turbopack followed by next start) indicates a potential discrepancy in how styles are handled between these two modes.

Recommendation

• Apply a workaround by adjusting the Next.js configuration or Turbopack settings to ensure consistent style prioritization, as the root cause seems related to the interaction between Turbopack and Next.js build modes.