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Don't load the app-page runtime in proxy.ts - #100384
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timneutkens merged 3 commits intoOct 19, 2026
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Tests PassedCommit: c258d40 |
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lubieowoce
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Oct 19, 2026
timneutkens
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Oct 19, 2026
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hmm wait what's causing this? this isn't obvious to me just from looking at this PR |
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not true anymore! updated the initial description |
lubieowoce
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Oct 19, 2026
lubieowoce
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Oct 19, 2026
Co-authored-by: Janka Uryga <lolzatu2@gmail.com>
timneutkens
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Backports [Don't load the app-page runtime in proxy.ts (#100384)](#100384) to `releases/lts/active` for the next 16.4.x patch. The cherry-pick applied cleanly. <!-- NEXT_JS_LLM --> 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Tobias Lins <me@tobi.sh> Co-authored-by: Janka Uryga <lolzatu2@gmail.com>
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Cause
importing anything from next/server also loads connection(), which loads dynamic-rendering.ts. That file imported React at the top just to read an owner stack in development, and in a proxy build this pulled in the 688 KB app-page-turbo.runtime.prod.js.
Fix
React is now imported lazily. No public API change.
Effect on a minimal proxy, on canary: the cold path goes from 53.8 ms to 39.1 ms (−27%) and JS loaded from 1,466 KB to 748 KB. The page runtime and React also drop out of middleware.js.nft.json, so the deployed proxy function is smaller.
Test
the new
test/production/app-dir/proxy-no-page-runtimeasserts the proxy's trace has no page runtime or React in it. It fails without the fix and passes with it on Turbopack and webpack.Existing tests that still pass: app-middleware-proxy and proxy-missing-export in production with Turbopack, and the cache-components-errors suites in dev with Turbopack.