fix: lazy load @eslint-react/eslint-plugin when react is disabled

[VdustR]

Summary

• Avoid loading @eslint-react/eslint-plugin when react: false (default)
• Create lib/eslint-react.ts for dynamic import
• Move static import to async callback in extendsConfig
• Add reactEnabled check before calling react()

Test plan

• Type check passes
• Tests pass
• Lint passes

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @VdustR, 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 a performance optimization by implementing lazy loading for the @eslint-react/eslint-plugin. Previously, this plugin would be loaded regardless of whether React linting was enabled. With these changes, the plugin is now dynamically imported only when the React configuration is explicitly activated, leading to reduced startup times and resource consumption for projects that do not utilize React.

Highlights

• Lazy Loading Implementation: Implemented lazy loading for @eslint-react/eslint-plugin to prevent its loading when React linting is disabled, optimizing resource usage.
• New Utility File: Introduced a new utility file (lib/eslint-react.ts) to encapsulate the dynamic import logic for the React ESLint plugin.
• Asynchronous Plugin Import: Refactored the react.ts configuration to use an asynchronous import for the plugin within the extendsConfig callback, leveraging the new utility.
• Conditional React Configuration: Added a conditional check (reactEnabled) in vdustr.ts to ensure React-specific ESLint configurations are only applied when React is explicitly enabled.

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Changelog

• .changeset/lazy-load-react.md
  • Added a new changeset file to document the lazy loading of @eslint-react/eslint-plugin.
• packages/eslint-config/src/extends/react.ts
  • Removed the direct static import of @eslint-react/eslint-plugin.
  • Updated the extendsConfig callback to asynchronously import the plugin using the new importEslintReact utility.
• packages/eslint-config/src/lib/eslint-react.ts
  • Created a new file to provide an asynchronous function (eslintReact) for dynamically importing @eslint-react/eslint-plugin using interopDefault.
• packages/eslint-config/src/vdustr.ts
  • Introduced a reactEnabled boolean flag to determine if React configurations should be applied.
  • Wrapped the call to the react() configuration function within a conditional block based on the reactEnabled flag.

Activity

• The pull request has passed type checks.
• All tests are passing.
• Linting checks have passed.
• The changes were generated with Claude Code.

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[gemini-code-assist]

Code Review

This pull request correctly implements lazy loading for @eslint-react/eslint-plugin to avoid loading it when React support is disabled. The changes are logical and well-implemented by introducing a dynamic import wrapper and conditionally calling the React configuration function. I have one suggestion to simplify the dynamic import wrapper for better readability and conciseness.