presets(bun): restore idle timeout environment variable

[b-mounir-dev]

Restores NITRO_BUN_IDLE_TIMEOUT support for the Bun preset after it was lost during the move to srvx.

Values from 0 to 255 are forwarded to Bun.serve, including 0 to disable the timeout. Invalid values are ignored.

Includes unit coverage, a Bun preset regression test, and updated runtime documentation.

Fixes #3454

[vercel]

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[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

The Bun preset now parses NITRO_BUN_IDLE_TIMEOUT, passes valid values to Bun.serve, documents the setting, and adds unit and runtime integration tests covering configuration forwarding and process cleanup.

Bun idle timeout

Layer / File(s)	Summary
Timeout parsing and runtime wiring src/presets/bun/runtime/_utils.ts, src/presets/bun/runtime/bun.ts, docs/2.deploy/10.runtimes/bun.md	Adds validation for values from 0 through 255, forwards valid values to Bun, and documents the environment variable.
Runtime forwarding test test/presets/bun.test.ts, test/presets/fixtures/bun-preload.ts	Launches Bun with the timeout configured, exposes the value through a test endpoint, verifies the response, and terminates the process during cleanup.
Parser boundary tests test/unit/bun-preset.test.ts	Covers valid boundary values and invalid, missing, negative, and out-of-range inputs.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The change restores env-based idleTimeout support, but the linked issue asked for server.bun.idleTimeout Nitro config support.	Expose server.bun.idleTimeout in Nitro config and wire it through to Bun.serve idleTimeout.
Title check	⚠️ Warning	The title is related to the change, but it does not follow conventional commit format.	Use a conventional commit title like fix(bun): restore idle timeout environment variable.},{

✅ Passed checks (3 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The documentation, runtime, utility, and test changes all align with the idle timeout feature and appear in scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The description matches the Bun idle timeout restore and mentions tests and docs.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[b-mounir-dev]

Hi @pi0 , any updates on this plz ? We are currently using a small patch, but it would be more convinient if we could rely on an official fix upstream. Thanks