Fix some JS race conditions and bugs.

[kixelated]

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[claude]

Claude finished @kixelated's task —— View job

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Code Review: Fix some JS race conditions and bugs

Reviewing the changes for bugs and security issues:

• Read and analyze all changed files
• Check JavaScript/TypeScript changes for race conditions and bugs
• Check Rust changes for potential issues
• Provide final assessment

Analysis Results

After reviewing all 10 changed files, I found several areas of concern:

⚠️ Issues Found

1. Known Race Condition in js/hang/src/watch/location.ts:42:

   // TODO This seems kinda wrong and racy

   This comment indicates an unresolved race condition that should be addressed.

2. Complex Promise.race Logic:

   • Multiple files have intricate async patterns with Promise.race() calls
   • js/moq/src/lite/subscriber.ts and js/moq/src/track.ts have particularly complex concurrent logic
   • These patterns are difficult to reason about and prone to timing issues

3. Silent Error Swallowing:

   • Several instances of .catch(() => {}) that hide errors
   • Example in js/moq/src/lite/publisher.ts:176: next.then((group) => group?.close()).catch(() => {})
   • This could mask important debugging information

4. Resource Management Complexity:

   • While cleanup patterns are generally good, the async complexity makes it hard to verify all paths
   • Multiple layers of producers/consumers with interdependent lifecycles

💡 Recommendations

1. Address the explicitly marked race condition in location.ts
2. Add logging to catch blocks instead of silencing all errors
3. Consider simplifying some of the complex Promise.race patterns
4. Add more explicit documentation around the async lifecycle management

The codebase handles complex real-time media streaming which inherently involves challenging concurrency patterns. While no critical security vulnerabilities were found, the race condition issues and error handling could impact reliability.