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Best Practices for React + TypeScript + Webpack Template

This project is a modern template for scalable React applications using TypeScript and Webpack. Follow these best practices to ensure maintainability, performance, and code quality.

1. Unit Testing

  • Write tests for all logic and UI components. Use Jest and React Testing Library for unit and integration tests.
  • Aim for 90%+ coverage. Exclude boilerplate, config, and index files from coverage.
  • Test edge cases and error states. Mock APIs and test both success and failure scenarios.
  • Use descriptive test names and group related tests with describe blocks.
  • Run tests locally and in CI before merging code.

Test Coverage Caveats

  • While this template aims for 90%+ branch coverage globally, 100% branch coverage is not always achievable for every file (e.g., service files with implicit returns or unreachable branches).
  • In such cases, the Jest configuration slightly lowers the branch threshold for those files. All meaningful logic and error paths are still covered by tests.

2. Performance

  • Code splitting: Use dynamic import() for large or rarely used components.
  • Memoization: Use React.memo, useMemo, and useCallback to avoid unnecessary re-renders.
  • Optimize images: Use modern formats and lazy loading for images.
  • Minimize bundle size: Remove unused dependencies and use tree-shaking.
  • Use production builds: Always deploy using yarn build (Webpack production mode).

3. Code Quality & DRY Principles

  • Keep components small and focused. Each component should do one thing well.
  • Reuse components and utilities. Place shared logic in utils/ or as custom hooks.
  • Avoid code duplication. Extract repeated logic into functions or components.
  • Use TypeScript for type safety. Define clear types and interfaces for props, state, and API responses.
  • Consistent naming conventions. Use PascalCase for components, camelCase for variables/functions.
  • Comment complex logic. Use comments to explain non-obvious code.

4. Project Structure

  • Organize by feature or domain. Group related files (components, views, services) together.
  • Use index files for exports. Simplifies imports and improves maintainability.
  • Separate config, mocks, and layout. Keep configuration, mock data, and layout components in their own folders.

5. Improvements & Recommendations

  • Add E2E tests (e.g., Cypress or Playwright) for critical user flows.
  • Linting and formatting: Use ESLint and Prettier for consistent code style.
  • Accessibility: Use semantic HTML and test with screen readers.
  • Error boundaries: Use and customize ErrorBoundary.tsx for robust error handling.
  • Environment variables: Store secrets and endpoints in .env files, not in code.
  • Continuous Integration: Use GitHub Actions or similar for automated testing and deployment.

6. Documentation

  • Document components and utilities. Use JSDoc or TypeScript doc comments.
  • Update README.md with setup, usage, and contribution guidelines.

By following these best practices, you ensure your projects built from this template are robust, maintainable, and scalable.