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WorkerOptions.type is a WorkerType ("classic" | "module") and
WorkerOptions.credentials a RequestCredentials ("omit" | "same-origin" |
"include"). Browsers and Deno throw a TypeError for any other value. The
constructor never read either option, so new Worker(url, { type: "zzz" })
was accepted.
The check applies to the Web Worker constructor only. node:worker_threads
calls the same native constructor with Kind::Node and has neither option,
so it keeps ignoring them as Node does. Valid values still have no further
effect; the bun-types JSDoc now says so instead of "does nothing".
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Updated 8:10 AM PT - Sep 8th, 2026
✅ @robobun, your commit a9d0a5f910442bc0d449da489a82e139d5272efd passed in 🧪 To try this PR locally: bunx bun-pr 41981That installs a local version of the PR into your bun-41981 --bun |
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Status: ready for review. Reproduced and verified with |
WalkthroughChangesWorker option handling
Suggested reviewers: Priority: ⬇️ Low — Defer this narrow Web Worker options validation because valid values keep the existing behavior and the change only adds standards-aligned input checks. Merge Risk: 🟡 Moderate · up to Invalid Web Worker options can still be accepted when callers provide a third constructor argument, leaving the documented validation contract incomplete. This should be fixed and covered before merge. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Inline comments:
In `@test/js/web/workers/worker.test.ts`:
- Around line 390-395: Replace the parameterized test.each() around the invalid
Worker options cases with describe.each(), and add a nested test() containing
the existing TypeError assertion for each case. Preserve the current test data
and expected error behavior.
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packages/bun-types/bun.d.tssrc/jsc/bindings/webcore/JSWorker.cpptest/js/web/workers/worker.test.ts
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No exception-check macro inside a lambda (REVIEW.md): validateEnumerationOption takes the ThrowScope like the other validators in this file's callers do.
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…its neighbour has It boots 48 workers in a child process. A debug+ASAN build on a loaded machine takes about 7s for that, past the 5s default, which fails the whole file for unrelated changes. Same isDebug ? 30_000 : 5_000 ceiling as the preload test above it.
…of raising its timeout REVIEW.md: shrink the workload rather than raise a per-test timeout. Four rounds of four workers still put terminate() against in-flight readFile completions at delays 0-6ms; a debug build gets through them in ~2.5s.
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Inline comments:
In `@src/jsc/bindings/webcore/JSWorker.cpp`:
- Line 209: Update the Worker constructor logic around validateEnumerationOption
so arbitrary third arguments cannot set options.kind to Node or bypass Web
Worker option validation; only the recognized internal node:worker_threads call
may use that path. Ensure invalid type and credentials still throw when a public
constructor receives a third argument, and add a regression test covering this
invocation.
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Problem
new Worker(url, { type: "zzz" })andnew Worker(url, { credentials: "zzz" })are accepted and the worker runs. In the HTML spec bothWorkerOptionsmembers are WebIDL enumerations (WorkerType:"classic" | "module",RequestCredentials:"omit" | "same-origin" | "include"), so browsers and Deno throw aTypeErrorfor any other value.JSWorkerDOMConstructor::construct(src/jsc/bindings/webcore/JSWorker.cpp) never read either option.Fix
WorkerOptions::Kind::Webonly, readtypeandcredentials. A present, non-undefinedvalue is converted withToString(WebIDL enum conversion) and must be one of the enumeration's strings, else the constructor throwsERR_INVALID_ARG_VALUE(aTypeErrorwhose message starts withThe property 'options.type' must be one of:). This constructor already reports a badoptions.envthrough the siblingERR_INVALID_ARG_TYPE.node:worker_threadscalls the same native constructor with a third argument (Kind::Node). Node has neither option and ignores unknown keys, so that path is untouched.bun-typesJSDoc for both options said "In Bun, this does nothing" and now states the accepted values and that they are otherwise ignored.test/js/web/workers/worker.test.ts("type and credentials options": four invalid values fail on 1.4.3, valid andundefinedvalues construct,worker_threads.Workerignores both). Also ran the env/argv/preload tests in that file andbun test test/integration/bun-types/bun-types.test.ts.Background
Workerconstructor is hand-written C++ rather than generated from IDL, so dictionary members get no automatic WebIDL conversion; each option is read withgetIfPropertyExistsand validated by hand.WorkerOptions::Kindis how the native side tellsnew Worker()(Web) fromnode:worker_threads(Node).Notes
SyntaxError(Worker: throw a SyntaxError for a script URL that does not parse #41974) and the close code afterterminate()(Worker: report close code 0 when the parent terminates a Web Worker #41969) ship separately, and bun-types: match the Worker declarations to the runtime #41818 fixes the other Worker declarations in bun-types.TypeError. This uses Bun's Node-styleERR_INVALID_ARG_VALUE(aTypeErrorwith acode) for consistency with the rest of this constructor; say so if a plainTypeErrorwith a browser-style message is preferred.nullis not treated as "absent": per WebIDL dictionary conversion onlyundefinedfalls back to the default, andString(null)is not a member of either enumeration, which matches Chrome and Firefox.