#Next.js 15.5.6 build inside docker

1 messages · Page 1 of 1 (latest)

open birch
real mapleBOT
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Hi @open birch. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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I'd be happy to help you with building Next.js 15.5.6 inside Docker! However, your question is quite broad. Let me provide you with some key information and best practices for Docker deployments with Next.js.

Docker Deployment Support

Next.js can be deployed to any provider that supports Docker containers, with full feature support for all Next.js capabilities, as mentioned in the official deployment documentation.

Key Considerations for Docker Builds

1. Environment Variables at Build Time

If you're using environment variables in next.config.ts, be aware that they need to be available during the build process. According to discussions in this GitHub issue, environment variables used in the Next.js config are compiled at build time, not runtime. You have two options:

  • Include a .env file in your build directory
  • Pass variables as Docker build arguments using ARG in your Dockerfile

2. Standalone Output Mode

For Docker deployments, it's recommended to use output: 'standalone' in your next.config.ts to reduce image size through output file tracing.

3. Common Docker Issues

  • Hot reload in development: If you're running Next.js in development mode inside Docker, you may need to configure webpack polling or mount volumes properly, as discussed in this issue
  • Build performance: Some users have reported build performance issues in Docker environments with certain Next.js versions, as noted in this performance regression report

Templates and Examples

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Next.js provides official Docker templates that you can reference:

Could you provide more specific details about what you're trying to accomplish or any issues you're encountering? This would help me give you more targeted guidance.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@open birch Kapa.ai is still learning and improving, please let me know how I did by reacting below.

open birch
real mapleBOT
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Let me check the knowledge base for you again. Give me one moment! :books:

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Sorry @open birch, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist:

Perhaps try again in 15mins?

open birch
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HookWebpackError: _webpack.WebpackError is not a constructor

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@real maple HookWebpackError: _webpack.WebpackError is not a constructor

real mapleBOT
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Let me check the knowledge base for you again. Give me one moment! :books:

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Based on the knowledge sources, I can see that HookWebpackError is a common error type in Next.js builds, but the specific error message "_webpack.WebpackError is not a constructor" is not directly addressed in the provided documents.

However, the knowledge sources show several examples of HookWebpackError occurring in different contexts:

Common HookWebpackError Scenarios

  1. CSS Processing Issues: Multiple issues show HookWebpackError related to CSS minification and processing, particularly with cssnano and PostCSS plugins, as seen in this CSS minification issue and this webpack error.

  2. File Tracing Problems: The error can occur during the build process when Next.js tries to trace dependencies, as shown in this favicon route issue.

Potential Solutions to Try

Based on similar webpack errors in the knowledge sources, you could try:

  1. Disable CSS Minification Temporarily (for debugging):
// next.config.js
const nextConfig = {
  webpack: (config) => {
    config.optimization.minimize = false;
    return config;
  }
};

Note: This is only for debugging and shouldn't be used in production, as mentioned in this comment.

  1. Check for CSS Syntax Issues: Review your CSS files for problematic selectors or syntax, particularly attribute selectors with empty values like *=" ", which have caused similar errors according to this discussion.
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Unfortunately, the knowledge sources don't contain specific information about the "_webpack.WebpackError is not a constructor" error. To get more targeted help, could you provide:

  • Your Next.js version
  • Your full error stack trace
  • Whether this occurs during next build or next dev
  • Any recent changes to your webpack configuration or dependencies

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: