Add a timer method to Effect.

[kixelated]

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[claude]

Claude finished @kixelated's task —— View job

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PR Review: Add a timer method to Effect

Reviewing this PR for bugs and security issues.

Todo List:

• Read changed files to understand the timer implementation
• Analyze for bugs and security issues
• Provide review feedback

Review Summary

👍 No bugs or security issues found. The timer implementation is well-designed and secure.

Implementation Analysis

The PR adds a timer method to the Effect class that provides automatic cleanup of timeouts, replacing manual timeout management in two locations:

New timer method (js/signals/src/index.ts:349-363):

• ✅ Proper resource cleanup: Automatically clears timeout on effect cleanup
• ✅ Memory safety: Sets timeout to undefined after execution to prevent double-clearing
• ✅ Defensive programming: Guards against calls on closed effects with dev warnings
• ✅ Type safety: Uses DOMHighResTimeStamp for millisecond parameter

Usage improvements:

• connection.ts:91: Replaced manual timeout + no cleanup → automatic cleanup
• chat.ts:68: Replaced manual timeout + explicit cleanup registration → automatic cleanup

Security & Safety Considerations

• No security vulnerabilities: Timer delays are controlled by application code, not user input
• Resource leak prevention: Automatic cleanup prevents timeout accumulation
• Error handling: Defensive checks prevent crashes on closed effects
• Memory management: Proper nullification prevents dangling references

The implementation follows the existing codebase patterns and improves resource management by centralizing timeout cleanup logic.