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## Summary
- Fixes the broken pipe behavior for `process.stdout.write()` to match
Node.js
- When writing to a broken pipe (stdout destroyed), the process now
properly exits with code 1 instead of 0
- EPIPE errors are now properly propagated to JavaScript via the
stream's error event
## Test plan
- [x] Added regression test `test/regression/issue/1632.test.ts`
- [x] Verified test fails with system bun (exit code 0) and passes with
debug build (exit code 1)
- [x] Verified `console.log` still ignores errors (uses `catch {}`) and
doesn't crash
- [x] Verified callback-based `process.stdout.write()` receives EPIPE
error
## Changes
1. **`src/io/PipeWriter.zig`**: Return EPIPE as an error instead of
treating it as successful end-of-file (`.done`)
2. **`src/shell/IOWriter.zig`**: Track `broken_pipe` flag when EPIPE is
received via `onError` callback, and propagate error properly
3. **`src/js/internal/fs/streams.ts`**: When a write fails without a
callback, emit the error on the stream via `this.destroy(err)` to match
Node.js behavior
Fixes #1632
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>