[MattCCC]

This pull request fixes the signal setting, which had no effect: fetchf() replaced the signal passed to a request with the one it uses for timeouts and cancellation, so aborting it neither cancelled the request nor stopped its retries or polling.

🐛 Bug Fixes

• Aborting the signal aborts the request: the abort is forwarded to the request, which fails with the reason of the abort like with fetch(). Aborting with controller.abort() cancels it like cancellable does, so its promise is only rejected with rejectCancelled: true, while a custom reason, e.g. the timeout of AbortSignal.timeout(), makes it fail with that reason.
• Already aborted signals: a request whose signal is aborted already isn't sent at all.
• Retries: aborted requests are no longer retried, whether they were aborted with the signal, by a newer request of a cancellable one or with abortRequest(). Before, a retry of a request cancelled by a newer one could cancel the newer one in turn.
• Polling: polling stops as soon as the signal is aborted, also while it waits for the next attempt, so no timers are kept alive.
• No leaks: requests stop listening to the signal once they are done, so one signal can be reused for many requests.
• It works the same for createApiFetcher() endpoints, e.g. api.getReport({ signal }).
• Documented the signal setting in the Request Cancellation section.

⚠️ Behavior Change

Aborted requests are not retried anymore, even when shouldRetry would retry them. Timeouts aren't affected, so they are still retried according to retryOn and shouldRetry.

🧪 Tests

• Aborting a pending request, an already aborted signal, rejectCancelled, custom abort reasons, the timeout of the request, and that requests stop listening to the signal once they are done.
• No retries after an abort, including one during the retry delay, and polling stopping when the signal is aborted while it waits or during a request.
• createApiFetcher() endpoints, and delayInvocation() ending early when its signal is aborted.
• Coverage stays at 100%.

📦 Bundle Size

The core bundles grow by about 0.1 KB (brotli). The size limits are raised to fit this and the other pull requests opened alongside it, so that they can be merged in any order.

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Generated by Claude Code

[github-actions]

size-limit report 📦

Path	Size
dist/browser/index.mjs	7.42 KB (+1.45% 🔺)
dist/browser/index.global.js	7.58 KB (+1.32% 🔺)
dist/node/index.js	7.5 KB (+1.48% 🔺)
dist/react/index.mjs	10.42 KB (+0.84% 🔺)
dist/react/index.js	11.31 KB (+0.83% 🔺)