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## What does this PR do? Fixes https://github.com/oven-sh/bun/issues/22650 Fixes https://github.com/oven-sh/bun/issues/22615 Fixes https://github.com/oven-sh/bun/issues/22603 Fixes https://github.com/oven-sh/bun/issues/22602 Fixes a crash that occurred when running shell commands through `bun run` (package.json scripts) on Windows that use the `&&` operator followed by an external command. ### The Problem The minimal reproduction was: ```bash bun exec 'echo && node --version' ``` This would crash with: `panic(main thread): attempt to use null value` ### Root Causes Two issues were causing the crash: 1. **Missing top_level_dir**: When `runPackageScriptForeground` creates a MiniEventLoop for running package scripts, it wasn't setting the `top_level_dir` field. This caused a null pointer dereference when the shell tried to access it. 2. **MovableIfWindowsFd handling**: After PR #21800 introduced `MovableIfWindowsFd` to handle file descriptor ownership on Windows, the `IOWriter.fd` could be moved to libuv, leaving it null. When the shell tried to spawn an external command after a `&&` operator, it would crash trying to access this null fd. ### The Fix 1. Set `mini.top_level_dir = cwd` after initializing the MiniEventLoop in `run_command.zig` 2. In `IO.zig`, when the fd has been moved to libuv (is null), use `.inherit` for stdio instead of trying to pass the null fd ### How did you verify your code works? - Added a regression test that reproduces the issue - Verified the test fails without the fix and passes with it - Tested the minimal reproduction command directly - The fix correctly allows both commands in the `&&` chain to execute ```bash # Before fix: crashes > bun exec 'echo test && node --version' panic(main thread): attempt to use null value # After fix: works correctly > bun exec 'echo test && node --version' test v22.4.1 ``` <sub> also probably fixes #22615 and fixes #22603 and fixes #22602 </sub> --------- Co-authored-by: Zack Radisic <zack@theradisic.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>