build: pnpm and enable JSDoc type checking for .gs files via TSC

[jpoehnelt]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @jpoehnelt, 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 introduces significant improvements to the project's development workflow and code quality. It modernizes the package management system by adopting pnpm, provides a detailed guide for Apps Script development, and integrates static type checking for Apps Script files using JSDoc and TypeScript. These changes aim to make development more efficient, consistent, and less prone to errors.

Highlights

• Package Manager Migration: The project has migrated from npm/yarn to pnpm, streamlining dependency management and potentially improving performance and disk space usage.
• Apps Script Development Guide: A new comprehensive guide (GEMINI.md) has been added, detailing best practices for developing Google Apps Script projects, including modern JavaScript features and Apps Script V8 runtime specifics.
• JSDoc Type Checking for .gs files: JSDoc-based type checking has been enabled for .gs (Google Apps Script) files using TypeScript, enhancing code quality and maintainability by catching type errors early.

Ignored Files

• Ignored by pattern: .gemini/** (1)
  • .gemini/settings.json
• Ignored by pattern: .github/workflows/** (3)
  • .github/workflows/lint.yml
  • .github/workflows/publish.yaml
  • .github/workflows/test.yml

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[gemini-code-assist]

Code Review

This pull request introduces pnpm for package management and a new TypeScript-based script for type-checking .gs files using JSDoc, which is a great step towards improving code quality and developer experience. The PR also includes comprehensive documentation for Apps Script development and the new type-checking process.

My review focuses on the new check-gs.ts script. I've found a couple of critical bugs in the file copying and error path rewriting logic that will prevent the script from working as intended. I've also pointed out a type-safety issue in the error handling. Addressing these points will ensure the new type-checking tool is robust and reliable.