Bug: bash tool hangs on Windows when grandchild process inherits stdout pipe

[bingkxu]

Description

On Windows, when running build tools like hvigor/Gradle daemons through the bash tool, the command hangs indefinitely even after the child process exits.

Root Cause

When a child process spawns grandchild processes on Windows, the grandchild may inherit the stdout/stderr pipe handles. Even after the direct child exits (with exit code 0), these inherited handles keep the pipe open, preventing Node.js close event from firing.

In packages/core/src/cross-spawn-spawner.ts, the exitCode is resolved only when the close event fires. This causes Effect.raceAll to hang indefinitely waiting for handle.exitCode.

Reproduction

1. Run a build command that spawns daemon processes (e.g., hvigorw assembleHap on HarmonyOS projects)
2. Observe that bash tool hangs after the build completes
3. The child process has exited but grandchild daemon still holds the pipe

Proposed Fix

Add a fallback in the exit event handler: if close does not fire within 2 seconds after exit, resolve exitCode using the exit event data. This matches the documented behavior difference between exit and close events in Node.js.

Environment

Platform: Windows
Node.js: v20+
OpenCode version: v1.14.x

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Bash tool hangs on Windows when command spawns detached child processes (e.g. playwright-cli) #24731: Same root cause (bash tool hangs on Windows when spawned processes keep pipe handles open) — specifically about detached child processes on Windows
• bash tool hangs when command spawns background child processes #20902: Same root cause (bash tool hangs when command spawns background child processes that inherit pipe file descriptors), with the same proposed fix direction (using exit event instead of close)

If your issue is distinct (e.g., specific to the grandchild-inherits-pipe scenario without detached: true), please clarify the difference in your issue. Otherwise, consider adding a comment to one of the above instead.