Nuxt•2mo ago

chunk large than 500kb

when i generate static, the command shows a warning as below, and how to fix it?: WARN [plugin builtin:reporter] 11:04:05 PM
(!) Some chunks are larger than 500 kB after minification. Consider: - Using dynamic import() to code-split the application - Use build.rollupOptions.output.manualChunks to improve chunking: https://rollupjs.org/configuration-options/#output-manualchunks - Adjust chunk size limit for this warning via build.chunkSizeWarningLimit.

Rollup

The JavaScript module bundler

2 Replies

kapa.ai•2mo ago

Hi @Zhaolin Lau. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- When you see the warning that some chunks are larger than 500 kB after minification during static generation, Nuxt (and Vite/Rollup) is alerting you that some of your JavaScript bundles are quite large, which can negatively impact performance. To address this, you have a few options: 1. Use dynamic import() for code-splitting:
By dynamically importing components or modules, you can split your code into smaller chunks that are only loaded when needed. For example, instead of importing a component at the top of your file, use:

   const MyComponent = defineAsyncComponent(() => import('~/components/MyComponent.vue'))

   const MyComponent = defineAsyncComponent(() => import('~/components/MyComponent.vue'))

This ensures the component is loaded only when required, reducing the initial bundle size. 2. Configure manual chunking with build.rollupOptions.output.manualChunks:
You can customize how Rollup splits your code into chunks by defining manual chunking rules in your Nuxt config. For example:

   export default defineNuxtConfig({
     vite: {
       build: {
         rollupOptions: {
           output: {
             manualChunks: id => {
               if (id.includes('node_modules')) {
                 if (id.includes('gsap')) {
                   return 'gsap'
                 }
                 if (id.includes('pinia') && !id.includes('vue')) {
                   return 'vendor-utils'
                 }
                 if (id.includes('@vueuse') && !id.includes('vue')) {
                   return 'vendor-vueuse'
                 }
               }
             }
           }
         }
       }
     }
   })

   export default defineNuxtConfig({
     vite: {
       build: {
         rollupOptions: {
           output: {
             manualChunks: id => {
               if (id.includes('node_modules')) {
                 if (id.includes('gsap')) {
                   return 'gsap'
                 }
                 if (id.includes('pinia') && !id.includes('vue')) {
                   return 'vendor-utils'
                 }
                 if (id.includes('@vueuse') && !id.includes('vue')) {
                   return 'vendor-vueuse'
                 }
               }
             }
           }
         }
       }
     }
   })

This example splits certain dependencies into their own chunks, which can help reduce the size of your main bundle and improve caching for vendor code.
See example in GitHub issue 3. Adjust the chunk size warning limit:
If you are aware of the large chunk size and have a reason for it, you can simply increase the warning threshold:

   export default defineNuxtConfig({
     vite: {
       build: {
         chunkSizeWarningLimit: 1000 // in kB
       }
     }
   })

   export default defineNuxtConfig({
     vite: {
       build: {
         chunkSizeWarningLimit: 1000 // in kB
       }
     }
   })

This will only suppress the warning and does not actually reduce the chunk size. Best Practice:
It's generally better to reduce chunk sizes by code-splitting and optimizing imports, rather than just increasing the warning limit. Use tools like nuxi analyze to visualize your bundle and identify large dependencies that could be split or loaded lazily.
Nuxt 4.x performance guide Summary:
- Use dynamic imports for lazy loading. - Configure manual chunking for better control. - Only increase the warning limit if you have a good reason. If you need more detailed examples or run into issues, the Rollup manualChunks documentation is a good resource. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@520675622830342144> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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chunk large than 500kb

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