feat: set up Turborepo typecheck across all packages

[amitsingh-007]

Summary

• Configure Turborepo to run pnpm typecheck efficiently across all packages and apps
• Typecheck now runs on root files, configs package, and all workspace packages
• Build task now depends on typecheck (and lint) passing first

Changes

• Root: Updated typecheck script to check both root files (tsc --noEmit) and all packages (turbo run typecheck)
• turbo.json: Added proper typecheck task configuration and made build depend on //#typecheck
• TypeScript configs: Fixed dom/webworker lib conflicts, added skipLibCheck: true
• configs package: Added dedicated tsconfig.json and typecheck script
• trpc package: Added CSS module declarations, changed to type-only imports

Test plan

• Run pnpm typecheck - should check root files and all packages
• Run pnpm typecheck --filter=<package> - should check specific package
• Verify build depends on typecheck passing
• Verify Turborepo caching works for subsequent runs

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @amitsingh-007, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the monorepo's development workflow by integrating a comprehensive and efficient type-checking system powered by Turborepo. The changes ensure that all code, from root-level files to individual packages, is type-checked consistently, and that builds are contingent upon successful type verification. This improves overall code quality, reduces potential runtime errors, and streamlines the development process by leveraging Turborepo's caching capabilities for faster feedback.

Highlights

• Turborepo Integration for Type-Checking: Configured Turborepo to orchestrate pnpm typecheck efficiently across all packages and applications within the monorepo.
• Expanded Type-Checking Coverage: Extended type-checking to include root-level files, the configs package, and all individual workspace packages, ensuring comprehensive type safety.
• Build Process Dependency: Established a dependency for the build task on both lint and typecheck tasks, ensuring type safety and code quality are verified before compilation.
• TypeScript Configuration Refinements: Resolved TypeScript library conflicts by adjusting lib configurations and introducing skipLibCheck: true in the base tsconfig to prevent issues with third-party library types.
• Dedicated Configs Package Type-Checking: Introduced a dedicated tsconfig.json and typecheck script for the configs package to manage its specific type-checking needs independently.
• TRPC Package Improvements: Added CSS module declarations and transitioned to type-only imports in the trpc package for improved type inference and potentially smaller bundle sizes.

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[gemini-code-assist]

Code Review

This pull request does a great job of setting up a monorepo-wide typechecking pipeline using Turborepo. The configuration changes are logical and correctly scope the TypeScript checks for each part of the repository. Making the build process dependent on passing type checks is a solid improvement for code quality.

I have a couple of suggestions to refine the implementation. One is to improve the efficiency of the Turborepo task dependencies for local development, and the other is a minor cleanup regarding a potentially misplaced type declaration file. Overall, excellent work on improving the project's tooling and robustness.

[webext-bot]

Extension Size Change:   -916.00 B ✅

Commit	61c7da2
Latest release size	179.13 KB
Current size	178.23 KB
Percent change	-0.50 %

---

This commit looks good, cheers 👏

[webext-bot]

Extension Size Change:   -916.00 B ✅

Commit	f612301
Latest release size	179.13 KB
Current size	178.23 KB
Percent change	-0.50 %

---

This commit looks good, cheers 👏

[webext-bot]

Extension Size Change:   -916.00 B ✅

Commit	4cee929
Latest release size	179.13 KB
Current size	178.23 KB
Percent change	-0.50 %

---

This commit looks good, cheers 👏

[webext-bot]

Extension Size Change:   -916.00 B ✅

Commit	b55dbd5
Latest release size	179.13 KB
Current size	178.23 KB
Percent change	-0.50 %

---

This commit looks good, cheers 👏