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fix(router): await server$ stream close so a client disconnect can't crash Bun - #8798
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wmertens merged 3 commits intoJul 14, 2026
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maiieul
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Jul 7, 2026
| break; | ||
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| // Swallow rejection: writable may be errored by a client disconnect. | ||
| await stream.write(encoder.encode(`${message}\n`)).catch(() => {}); |
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Could we log the error message in dev mode at least?
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| // Streams an async-iterator server function result to the response writable. A mid-stream |
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wmertens
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July 13, 2026 06:34
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@aggyomfg the unit test is failing on an undefined qrl |
…crash Bun - fix unit test
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July 13, 2026 15:13
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What is it?
Description
A streaming
server$(anasync function*consumed as a stream) crashes theentire Bun process when the client disconnects mid-stream (SPA navigation
away, tab close, refresh, network drop).
When the client goes away, the response writable is errored, so
write/closereject. The async-iterator branch of
runServerFunctioncalledstream.close()without awaiting or catching it, so the rejection went unhandled. On Bun the
default
unhandledRejectionbehavior is to abort the process (Node only logs awarning, which is why this stayed hidden there). After the crash every following
request fails with
ECONNREFUSED— the server is gone.The fix extracts the streaming branch into
streamServerFunctionResultandawaits + swallows both the per-itemwriteand the finalclose, so adisconnected writable tears down quietly instead of leaking a rejection.
Reproduction: a streaming
server$on the Bun adapter — open the stream,read one chunk, then abort the request while it is still producing; the process
exits.
Related: #5929 (fixed the
TextEncoderStreampolyfill, not this close),#4381 (Node
ERR_STREAM_DESTROYEDon the same class of teardown),oven-sh/bun#18228 (Bun's stance: the framework must catch the close).
Test drives
streamServerFunctionResultwith a writable whoseclose()rejects (thepost-disconnect state) and asserts no unhandled rejection escapes. It is red
without the fix (leaks
Cannot close a writable stream that is closed or errored) and green with it. The process-abort half is Bun-specific and can't bereproduced under Node, but the leaked-rejection root cause is covered here.
Checklist
pnpm change