Preventing Next.js WithBundleAnalyzer from Opening on Refresh

Sean Hannity

less than a minute read

·

09-11-2024

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When using the Next.js framework for building web applications, you might occasionally utilize the withBundleAnalyzer feature to analyze your application's bundle size. However, one common issue developers face is that the bundle analyzer opens automatically on page refresh. This can be disruptive during the development process. Below are steps to prevent the bundle analyzer from opening on refresh.

Understanding withBundleAnalyzer

The withBundleAnalyzer feature is a plugin that allows developers to visualize the size of their Webpack output files with an interactive zoomable treemap. It is very useful for optimizing the bundle size, but it should not automatically open when you refresh your application.

Steps to Prevent Automatic Opening

1. Modify Your Next.js Configuration

To prevent the bundle analyzer from opening automatically on refresh, you will need to configure it correctly in your next.config.js. Here is an example of how you can set it up:

// next.config.js
const withBundleAnalyzer = require('@next/bundle-analyzer')({
  enabled: process.env.ANALYZE === 'true',
  openAnalyzer: false, // Disable automatic opening of the analyzer
});

module.exports = withBundleAnalyzer({
  // Other Next.js configurations
});

2. Use Environment Variables

Make sure to set the ANALYZE environment variable when you want to generate the bundle analysis. For instance, you can start your application with the following command in your terminal:

ANALYZE=true next dev

By setting openAnalyzer to false, you ensure that the bundle analyzer will not open automatically, allowing you to refresh your application without interruptions.

3. Accessing the Bundle Analyzer Manually

If you need to visualize the bundle analysis after disabling the automatic opening, you can still access it manually by running the following command:

ANALYZE=true next build && next export

This will generate the bundle analysis, and you can view it in your output directory.

Conclusion

By configuring withBundleAnalyzer correctly and utilizing environment variables, you can prevent the bundle analyzer from opening automatically on refresh in your Next.js application. This approach not only streamlines your development workflow but also allows you to manage your application's bundle size more efficiently.