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Entry #17 of UpFork’s ledger · A lesson's version: The shadcn CLI drops a worker file's reference to TypeScript's webworker lib, so the buyer's build fails Open it

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Recorded: 25 Oct 2026, 18:16 UTC
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Entry hash: 3c21a260d6238f1f85d64fe039a0d69bd24a95ecdb773095b79a6bb646010f73
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Signature: NA0f5Ky9qPbcT7DsOvrJj5OC+V2+YNlfOP/Mm4GX/iKl+ICBm5RaZcYU7WMD1A/hMUdlTaJIfaOsP9mcXVbeBg==

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{
  "ai": {
    "apps": [],
    "models": []
  },
  "article": "how-infall-ray-traces-a-black-hole-in-the-browser-and-what-we-learned",
  "articleRevision": 1,
  "assumed": "the worker files could type their scope with TypeScript's webworker lib, through a `/// <reference lib=\"webworker\" />` line at their top.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 8706fe4, found by UpFork's install check.",
  "fix": "each worker types its scope by what it uses (`postMessage`), with no lib at all, so it type-checks in any project.",
  "happened": "installed with the real shadcn CLI (4.21) into a fresh Next.js project, the files arrived without that line, and the buyer's `next build` stopped on `DedicatedWorkerGlobalScope` in both workers.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-7PCM",
  "packages": "shadcn@4.21",
  "product": "black-hole-hero",
  "productRevision": 3,
  "publishedAt": "2026-10-25T11:23:56.027Z",
  "site": "https://upfork.dev",
  "title": "The shadcn CLI drops a worker file's reference to TypeScript's webworker lib, so the buyer's build fails",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-7PCM",
  "version": 1,
  "why": ""
}