preflight-checks

# Preflight Code Quality Checks

This skill provides comprehensive guidance for discovering and running code quality checks across different project types.

## Overview

Preflight checks are the quality gates that verify code before commits, PRs, or deployments. They typically include:

1. **Type Checking** - Static type verification (TypeScript, MyPy, etc.)
2. **Linting** - Code quality and style enforcement
3. **Formatting** - Consistent code style
4. **Security Scanning** - Dependency audits and static analysis (SAST)
5. **Testing** - Unit, integration, and e2e tests

## Quick Reference

### Node.js / TypeScript Projects

| Check | Command | Auto-fix |
|-------|---------|----------|
| TypeScript | `npx tsc --noEmit` | N/A (manual) |
| ESLint | `npx eslint .` | `npx eslint . --fix` |
| Biome | `npx biome check .` | `npx biome check . --write` |
| Prettier | `npx prettier --check .` | `npx prettier --write .` |
| Jest | `npx jest` | N/A |
| Vitest | `npx vitest run` | N/A |

**Prefer npm scripts when available:**
```bash
# Check package.json scripts first
npm run lint        # if exists
npm run typecheck   # if exists
npm run test        # if exists
npm run check       # often runs all checks
```

### Python Projects

| Check | Command | Auto-fix |
|-------|---------|----------|
| MyPy | `mypy .` | N/A (manual) |
| Ruff lint | `ruff check .` | `ruff check . --fix` |
| Ruff format | `ruff format --check .` | `ruff format .` |
| Black | `black --check .` | `black .` |
| isort | `isort --check .` | `isort .` |
| Pytest | `pytest` | N/A |

**With pyproject.toml (modern Python):**
```bash
# Check for [tool.X] sections
ruff check . && ruff format --check .  # Ruff (fast, recommended)
mypy src/                               # Type checking
pytest                                  # Tests
```

### .NET Projects

| Check | Command | Auto-fix |
|-------|---------|----------|
| Build | `dotnet build` | N/A |
| Build strict | `dotnet build --warnaserror` | N/A |
| Format check