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Recorded on 26 October 2026, unchanged since

Entry #104 of UpFork’s ledger · A lesson's version: tsup's rollup tree-shaking pass strips the use client banner from its output: turn it off and let esbuild shake Open it

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Recorded: 26 Oct 2026, 09:31 UTC
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Entry hash: 1a208499a34ae07c4344744ef6d2cb5e8649cee8fee7be1f9ccfc58956122bf2
Before it: 2ac7887c67b7c9a10e4d14952379afa77fab00b98576905dfc80f69d16f3535e
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Signature: 8/8fVEILm8bgf9UfZjd9jBwyhl7eQhEFA5o+X3KQUI14DRO9Oj0cOcSD4QLf3de4h3D6dU0ktc/sH+UP0WmGCA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "orbitgallery-a-react-three-fiber-carousel-a-glide-that-always-lands-and-nine",
  "articleRevision": 1,
  "assumed": "`banner: { js: '\"use client\";' }` in tsup's config would put the directive at the top of every output chunk, so the package works in the Next.js App Router.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit bc05c54 (tsup.config.ts) and commit 8fed05e (the Next.js 16 test app).",
  "fix": "`treeshake: false`, since esbuild tree-shakes on its own, and the banner stays on every chunk. A Next.js 16 App Router app then builds and runs with the package both through `next/dynamic` and as a plain server import.",
  "happened": "tsup's extra rollup pass for `treeshake: true` dropped the banner from the output, and without the directive the App Router can't tell the chunks are client code.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-FG3R",
  "packages": "tsup@8.5",
  "product": "orbit-gallery-3d-carousel-react",
  "productRevision": 4,
  "publishedAt": "2026-10-26T09:30:43.802Z",
  "site": "https://upfork.dev",
  "title": "tsup's rollup tree-shaking pass strips the use client banner from its output: turn it off and let esbuild shake",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-FG3R",
  "version": 1,
  "why": ""
}