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Entry #14 of UpFork’s ledger · A lesson's version: Next.js 16's build hangs when a web worker imports the module that starts it Open it

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Recorded: 25 Oct 2026, 18:16 UTC
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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 module holding the light-path code could also start the web worker that computes them, with `new Worker(new URL(\"./x.worker.ts\", import.meta.url), { type: \"module\" })`, while the worker imports that same module.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "third milestone (00b192a); infall-tables.ts.",
  "fix": "the code that starts the worker lives in a module of its own (`infall-tables.ts`) that the worker never imports.",
  "happened": "`next build` (Turbopack) hung and had to be killed: the worker imported `infall-geodesics.ts`, which started the worker that imported it.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-7JHY",
  "packages": "next@16.3",
  "product": "black-hole-hero",
  "productRevision": 3,
  "publishedAt": "2026-10-25T11:23:56.027Z",
  "site": "https://upfork.dev",
  "title": "Next.js 16's build hangs when a web worker imports the module that starts it",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-7JHY",
  "version": 1,
  "why": ""
}