Why are api-route First Load JS going from 0b to 109kb after upgrade to NextJs 15? #73986
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SummaryAfter Upgrading to NextJs 15 and React 19 my build went from this: To this: Do not understand the reason, help understanding would be much appreciated :)! Additional informationNo response ExampleNo response |
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Replies: 2 comments 23 replies
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Could you help us debug this, please install, https://www.npmjs.com/package/@next/bundle-analyzer, and run it. It'll open three browser windows, one of them has what'll be sent to the client, could you post a screenshot of that? |
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Sure I have bad knowledge on who I should tag 😅. Don't want to bother anyone unmercenary 😊. I wonder why my pages also go up by ~20kbs using latest NextJs version 🤔 |
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React has gotten larger, IIRC: https://www.reddit.com/r/reactjs/comments/1h7gpwe/comment/m0m3d9s/?share_id=rjYva1pcb3Pp6ibv9sB-H maybe that's it? React itself is very small, react-dom is the heavy one. If you do the vite starter template
18.3.1 : 143.90 kB │ gzip: 46.34 kB
19.0.0 186.49 kB │ gzip: 58.96 kB
Let's try to avoid spamming now, and wait for a response from the tags |
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@icyJoseph Thanks for investigating and taking a look! Pinging the team on this— |
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To enable We should just print a dash there! The 0 B in v14 was similarly strange, I think. |
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Ahh ok, thanks for this information @samcx 🙏! |
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Yep! |
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Thank you both @icyJoseph and @samcx for helping me understand this 🙌. Marked your answer as the definitive answer samcx. |
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Wow this was really confusing to me as well! |
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To enable
use cachein Route Handlers, we started generating client reference manifests and client chunks for Route Handlers in #70897. This led to the shared initial client JS size being also shown for Route Handlers. It's confusing for users because from the output it's not immediately clear that this is client JS, which is irrelevant for Route Handlers.We should just print a dash there! The 0 B in v14 was similarly strange, I think.