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feat: add css files to server bundle for optimizeCss feature to work#2965
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Description
The inlining of Critical CSS with the optimizeCss feature doesn't work when using Next.js 15.3.3 (Page Router) and @netlify/plugin-nextjs 5.11.2.
The optimizeCss feature relies on the CSS files being present in the server-function bundle. During page rendering (e.g., during ISR or revalidation), a server function using the Critters library attempts to locate the CSS files used on the page and inline them in the HTML. Without these files in the server-function bundle, the inlining process fails.
These changes make the bundling process include
.next/static/cssfiles in the server-function bundle.Detailed information is in the attached issue below.
Documentation
This is an internal change that should not require documentation.
Tests
Code coverage did not change. That should not require tests changes.
GitHub issue
#2963