fix type errors in launcher/main.js

[arikorn]

Since ts-check is enabled for this file, numerous errors are reported when it is opened in VS Code.

For the most part this PR just adds the necessary JSDoc comments. In a few cases it fixes minor coding errors revealed by the type-checking.

Summary by CodeRabbit

• Chores
  • Improved application stability through enhanced safety checks and type clarity.

[coderabbitai]

📝 Walkthrough

Walkthrough

Enhanced type safety in launcher/main.js through JSDoc annotations and null-safety checks, including optional chaining for IPC communication. Added customLog function for dual-stream logging. Made shouldRestart field public in RespawnMonitor for launcher integration.

Changes

Cohort / File(s)	Summary
Type Safety & Logging Enhancements launcher/main.js	Added JSDoc type annotations throughout, introduced optional chaining for child IPC access, guarded crashTimeout clearing, implemented customLog function for simultaneous logStream and console output.
Public API Expansion shared-lib/lib/Respawn.ts	Changed shouldRestart field from private to public visibility to enable external access from launcher/main.js, maintaining boolean type.

Poem

🛡️ With optional chains and guards so tight,
Null checks dancing in the night,
shouldRestart now steps into the light,
Types and logs align just right,
Safety blooms in TypeScript's flight! ✨

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main objective of the pull request—fixing type errors in launcher/main.js through JSDoc annotations and minor code fixes.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}