feat(rsdoctor): add tree shaking skills

[yifancong]

This pull request introduces a new set of tree-shaking analysis commands to the rsdoctor-analysis CLI and refactors the API usage in the rsdoctor.js script for improved clarity and maintainability. The most impactful change is the addition of comprehensive tree-shaking diagnostics, enabling users to detect and analyze issues that prevent dead-code elimination in their bundles. Additionally, the refactoring of API constants and request functions streamlines the code and reduces repetition.

Tree-shaking analysis feature additions:

• Added a new tree-shaking command group to the CLI, including subcommands for detecting side-effects-only imports (E1007), CJS require usage (E1008), ESM-to-CJS resolution issues (E1009), a summary report, module bailout reasons, and exports analysis. (packages/rsdoctor-analysis/src/commands/tree-shaking.ts)
• Registered the new tree-shaking commands in the CLI entrypoint, making them available to users. (packages/rsdoctor-analysis/src/command.ts)

E1007-E1009 docs:
web-infra-dev/rsdoctor#1571
web-infra-dev/rsdoctor#1586

Demo

• rsdoctor skill result: https://github.com/yifancong/side-effects-demo/blob/main/rsdoctor-skill-result.md
• tree-shaking-demo: https://github.com/yifancong/side-effects-demo/tree/main

[gemini-code-assist]

Summary of Changes

Hello, 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 rsdoctor analysis tool by integrating advanced tree-shaking capabilities. It provides developers with a powerful suite of commands to diagnose and understand why certain modules are not being tree-shaken, offering insights into common pitfalls like side effects, CJS dependencies, and ESM-to-CJS resolution issues. This addition aims to help optimize bundle sizes and improve application performance by making tree-shaking inefficiencies more transparent and actionable.

Highlights

• New Tree-Shaking Analysis Commands: Introduced a new set of CLI commands under rsdoctor tree-shaking to provide detailed analysis and diagnostics for tree-shaking issues.
• Comprehensive Tree-Shaking Diagnostics: Added commands to detect specific tree-shaking violations, including side-effects-only imports (E1007), CJS require() calls (E1008), and ESM imports resolving to CJS (E1009).
• Module Bailout Reasons and Export Analysis: Implemented functionalities to summarize tree-shaking health, list modules that cannot be tree-shaken with their bailout reasons, and analyze module exports to identify optimization opportunities.

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[gemini-code-assist]

Code Review

This pull request introduces a new set of tree-shaking analysis commands to the rsdoctor-analysis tool. A new file, tree-shaking.ts, was added to define commands for detecting side-effects-only imports (E1007), CJS require() calls (E1008), and ESM imports resolving to CJS (E1009), along with commands for a comprehensive tree-shaking summary, bailout reasons, and exports analysis. These new commands are integrated into the main CLI program by importing and registering them. Additionally, the bundled rsdoctor.js file was updated to reflect these new functionalities, including renaming internal API constants and request functions for consistency.