mdn / mdn/browser-compat-data

api.fetch - `signal` property is supported by Bun

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browser:bun data:api p3
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Description

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

"signal property" row value for Bun says "No support".

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

Bun 1 — Full support.

Did you test this? If so, how?
$ bun --version
1.3.14
$ bun run script.js
Error: TimeoutError (The operation timed out.)

where script.js is:

const url = "https://example.org/"
try {
  const timeoutSignal = AbortSignal.timeout(1);
  const res = await fetch(url, { signal: timeoutSignal }); // pass the signal property
} catch (e) {
  console.log(`Error: ${e.name} (${e.message})`);
}
Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/API/Request/signal
https://developer.mozilla.org/en-US/docs/Web/API/AbortController
https://developer.mozilla.org/en-US/docs/Web/API/AbortController/signal

Do you have anything more you want to share?

https://bun.sh/docs/runtime/networking/fetch#canceling-a-request
https://bun.sh/docs/runtime/nodejs-compat#fetch

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API

MDN metadata
MDN page report details
  • Query: api.fetch
  • Report started: 2026-08-02T04:54:41.799Z

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Locate the api.fetch compatibility record and its signal property row, then review the supplied Bun reproduction and linked Bun documentation. Update the Bun support value to full support and run the repository's relevant data validation checks to confirm the record remains valid.

Written by the indexing model from the issue text.

Assessment

Tech stack
bun, javascript
Domain
data
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
75/100

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