vite/.github/copilot-instructions.md

This is a TypeScript project that implements a frontend build tooling called Vite. Please follow these guidelines when contributing:

Code Standards

• Run pnpm run lint to ensure that your code adheres to the code standards.
• Run pnpm run format to format your code.
• Build: pnpm run build
• Test: pnpm run test (uses Vitest and Playwright)

Repository Structure

• docs/: Documentation
• packages/create-vite: The source code for the create-vite command
• packages/plugin-legacy: The source code for the @vitejs/plugin-legacy plugin
• packages/vite: The source code for the Vite core
• playground/: E2E tests

PR Guidelines

PR Title & Commit Messages

• Follow the commit message convention

PR Description

• What does this PR solve? - Clear problem/feature description
• Why was this approach chosen? - Implementation rationale
• If this is a new feature, include a convincing reason.
• If this adds a new config option, verify problem can't be solved with smarter defaults, existing options, or a plugin
• If this is a bug fix, explain what caused the bug - Link to relevant code if possible

Code Style & Standards

• Code follows TypeScript best practices
• Maintains existing code structure and organization
• Comments explain "why", not "what"

Testing

• Prefer unit tests if it can be tested without using mocks
• E2E tests should be added in the playground/ directory

Documentation

• Update documentation for public API changes
• Documentation changes go in docs/ folder

Other Considerations

• No concerning performance impacts